report of the committee on mr. bukowski voted affirmative ... · mr. bukowski voted affirmative...

Report of the Committee on

National Fuel Gas Code

J . j . Drechsler, Chair Baltimore, MD

Rep. American Gas Assn.

AllenJ. Callahan, Nonvoting Secretary American Gas Assn., OH Rep. American Gas Assn.

Joe A. Akin, Alabama Gas Corp., AL Rep. Southern Building Code Congress Int'l Inco

John O. Bigelow, Bigelow Assoc., NJ James P. Brewer, Magic Sweep Chimney Sweeps, VA

Rep. Nat'l Chimney Sweep Guild Thaddeus Bukowski, Underwriters Laboratories Inc., IL Ross K. Burnside, UTC Carrier Corp., IN

Rep. Gas Appliance Mfrs. Assn. Inc. J ames F. Car-fie. nrry. ,Jr , . American. Insurance Services Grou p, NY

Rep. Americaen Insurance Serxaces Group, Inc. Leon. Douovan, Factory Mutual Research Corp., MA Mike Gotham, Northwest LP Gas Co., MN

Rep. Nat'l Propane Gas Assn. WiIfiur L. ttaag, Jr., A. O. Smith Water Products Co., SC

Rep. Gas Appliance Mfrs. Assn. Inc. Daryl L. Hosler, Southern California Gas Co., CA Rep. American Gas Assn.

Brldn C. Olson, Nat'l Park Service, CO Leonard Pakruda, Liquefied Petroleum Gas Board (AL), AL Robert Picott, City of Los Angeles, CA

Rep. International Assn. of Plumbing & Mechanical Officials Robert E. Rhead, Lumbermens Mutual Casualty (Kemper), IL Issae P. Sargunam, Maytag Cleveland Cooking Products, TN

Rep. Assn. of Home Appliance Mfrs. David B. Schumacher, l¥iter-City Products Corp., TN

Rep. Gas Appliance Mfrs. Assn. Inc. Larry L. Westllng, Northwest Natural Gas Co., OR

Rep. American Gas Assn. Ricli-ard E. White, South Bend, IN Rep. Nat'l Assn. of Plumbing Heating Cooling Con~-actors

Alternates

Paul E. Beach, Emerson Electric Co., OH (Alt. to W. L Haag)

Armand V. Brandao, Factory Mutual Research Corp., MA G(Alt. to L. P. Donovan) len Edgar, Selkirk Metalbestos, OH (Air. to IL K. Burnside)

Michael Snyder, ServiceAir, MD (Alt. to IL E. White)

BruceJ, Swiecicki, Nat'l Propane Gas Assn., IL (Alt. to M. Gotham)

Staff Liaison: Theodore C. Lemoff

This list represents the membership at the time the Committee was balloted on the text of this edition. Since that time, changes in the membership may have occurred.

Committee Scope: This Committee shall have primary responsibil- ity for a documents on safety code for gas piping systems on consumers' premises and the installatio-n ofigas-udlization equipment and accessories for use with fuel gases such as natural gas, manufactured gas, liquefied petroleum gas in the vapor phase, liquefied petroleum gas-air mixtures, or mixtures of these gases, including: a. The design, fabrication, installation, testing, operation and maintenance ofga~ piping systems from the point of delivery to the connections with each gas utilization device. Piping systems covered by this Code are limited to a maximum operating pressure of 125psig. For purposes'of this Code, the point of delivdr~ is definedas the outlet of the meter set assem~oly, or the outlet of the service regulator or service shutoffvalve where no meter is provided. b. The installation of gas utilization equipment, related accessories, and their ventilation and venting systems.

The Report of the Technical Committee on National Fuel Gas Code is presented for adoption.

This Report was prepared by the Technical Committee on National Fuel Gas Code and proposes for adoption amendments to NFPA 54- 1992, National Fuel Gas Code. NFPA54-1992 is published in Volume 2 of the 1995 National Fire Codes and in separate pamphlet form.

This Report has been submitted to letter ballot of the Technical Committee on National Fuel Gas Code which consists of 19 voting members; of whom 18 voted affirmatively, and 1 ballot was not returned (Mr. White).

Mr. Bukowski voted affirmative with the following comments: "Log 2.11, 5-3.5 - I agree with Committee Action to accept and its

rationale. However, l-suggest the Exception be reworded-as follows for clarity: 'Exception: Louvers shall be interlocked with the equipment . . . . so that they are p.roven in. the full o pen position, rior to main burner ~gmtaon and dunng main burner operation. MP~ans shall be provided to prevent the main burner from igniting should the louver fail to open during burner startup and to shut down the main burner should be louvers close during burner operation. ~

Logs 44, 53, 156, 55, 58 - I agree with Committee Action but suggest the Committee Statement in Log 42 (which is referenced by Logs-44, 53, 156, 55, and 58) be revised to add the following: 'The Commit- tee believes that the phrase "terms of its listing" shbuld be included in the paragraph for clarity,' Please refer to Eogs 65 and 66 for ex,'unple on how this was done."

Mr. Picott voted affirmative with the following comment: "My vote is affirmative on all actions of the Committee except Log

#109Section 6.24.1 Exceptiosn No. 1 and 2; I vote negative."

(Log #CP16) 54- 1 - (1.1.1(a).l): Accept SUBMITTER: National Fuel Gas Code Committee RECOMMENDATION: Revise to read:

1. Coverage of piping systems shall extend from the point of delivery to the connections with each gas utilization device. For other than undiluted liquefied petroleum gas systems, the point of delivery shall be considered the outlet of the service meter assembly, or the outlet of the service regulator or service shutoffvalve when no meter is provided. For undiluted liquefied petroleum gas systems, the point of delivery shall be considered the outlet of the final pressure regulator, exclusive of line ~ regulators, in the

SUBSTANTIATION: With the change in NPFA 58 to mandate two stage pressure regulation it becomes logical, to make the. split of the two standards comparable to the spht between the Nauonai Fuel Gas Code and Federal Regulations. This places most propane piping outside of buildings under the scope of NFPA 58. The Committee notes that current coverage in the NFGC refers this piping to NFPA 58. COMMITrEE ACTION: Accept.

(Log #1 ) 54-2 - (t.1.1 (a).3 Exception Nos. 2 and 2.5.2): Reject Note: This proposal appeared as comment 54-2 which was held for

further study fxom the Annual 92 TCD, which was on proposal 54-2. SUBMITTER: Verle H. Brown, lnti Gas Systems Inc. RECOMMENDATION: Revise text as follows:

Exception No. 2 still refers to 2.5.4 which no longer exists having been changed to 2.5.2. With regard to the 20 psig pressure for LP- gas in buildings; we have been "fighting" this in the T&S committee for over 20 years. As shown on the thermodynamic charts below, 20 psig pressure in .the .p ip in .g in an .unheated. building could result in the gas condensing into hqmd v~th potentially hazardous results. If the LP-Gas was Butane, condensation would occur at any temperature below 75°F, while the usual LP-Gas which is Propane would not begin condensing until temperature dropped below a-5°F. While minus 5 degrees may sound a little more "safe", the fact is that there are many areas where temperatures are below this for many days, or even months, and if the building is unheated, condensation would occur. We suggest the following change:

1.1.1a3., Exception No. 2: LP-Gas piping systems are limited to 20 psig, except as provided in 2.5.2.

2.5.2 Liquefied Petroleum Gas Systems: The maximum design operating pressure for undiluted propane shall not exceed 20 psig unless piping system is exposed to ambient temperature below 0°F. At lower temperatures, and/or with an LP-Gas other than propane, provision must be made to lower the operating pressure, or protect the pipingby heat tracing (or other method acceptable to the authorityhavingjurisdiction) or both. SUBSTANTIATION: We have crossed out "maximum" because "shall not exceed" make it redundant. We have also crossed out "design" because "design pressure" and "operating pressure" are not the same thing. In fact, it is highly desirable for the "design pressure" to exceed the "operating pressure" by a large margin. COMMITI'EE ACTION: Reject. C O M M I T r E E STATEMENT: The submitter provides no substantiation to demonstrate that a problem exists.

812

N F P A 54 - - A 9 6 R O P

Table 3. Thermodynamic Properties of Saturated Propane

Enthalpies and Entropies are referred to saturated liquid at - 2 0 0 F . where the values are z e r o . Refer to Fig. 1 for Enthalpies and Entropies of super heated propane vapor.

Latent Entropy Pressure Specific Volume Density Ib Enthalpy Heat Btu Btu per lb

T~e~. P Lb. per Sq. in. Cu. FL per Ib per Cu. Ft. Btu per Lb. per lb Deg. F.

Ft Absolute p Gau~{e fp Liquid Vapor V L i q u i d / / Vapor / /V Liquid hf Vapor h~{ L Liquid sf I Vapor sg

-75 6.37 "17.0 0.02660 14.5 37.59 0.0690 65.5 255.5 190.0 0.142 0.624 -70 7.37 "14.9 0.02674 12.9 37.40 0.0775 68.0 257.0 189.0 0.148 0.623 -65 8.48 "12.7 0.02688 11.3 37.20 0.0885 71.5 258.0 186.5 0.154 0.621 -60 9.72 *10.1 0.02703 9.93 37.00 0.111 74.0 259.5 185.5 0.160 0.620 -55 11.1 *7.3 0.02717 8.70 36.80 0.115 77.0 261.0 184.0 0.167 0.618

-50 12.6 *4.3 0.02732 7.74 56.60 0.129 79.5 262.7 183.2 0.173 0.617 -45 14.4 *0.6 0.02748 6.89 36.39 0.145 82.$ 264.2 181.9 0.179 0.615 -40 16.2 1.5 0.02763 6.13 36.19 0.163 85.0 2,65.8 180.8 0,185 0.614 -35 18.1 3.4 0.02779 5.51 35.99 0.181 87.5 267.2 179,7 0.190 0.613 -30 20.3 5,6 0.02795 4,93 35.78 0.203 90.2 268.9 178.7 0.196 0,612

-25 22.7 8.0 0.02811 4.46 35.58 0.224 92.8 270.3 177.5 0.202 0.610 -20 25.4 10.7 0.02827 4.00 35.37 0.250 95.6 271.8 176.2 0.208 0.608 -15 28.3 13.6 0.02844 3.60 35.16 0.278 98.3 273.2 174.9 0.214 0.607 -10 31.4 16.7 0.02860 3.26 43.96 0.307 101.0 274.9 173.9 0.220 0.607

-5 34.7 20.0 0.02878 2.97 34.75 0.337 103.8 276.2 172.4 0.226 0.606

0 38.2 23.5 0.02895 2.71 34.54 0,369 106.2 277.7 171.5 0.251 0.605 -5 41.9 27.2 0.02913 2A8 34.33 0.403 108.8 279.0 170.2 0.236 0.604 10 46.0 31.3 0.02931 2.27 34.12 0.441 111.$ 280.5 167.2 0.246 0.605 15 50.6 35.9 0.02950 2.07 33.90 0.483 114.0 281.8 167.8 0.248 0.602 20 55.5 40.8 0.02970 1.90 33.67 0.526 116.8 283.1 166.3 0.254 0.601

25 60.9 46.2 0.02991 1.74 35.43 0.575 119.7 284.4 164.7 0.260 -0.600 30 66.3 51:6 0.03012 1.60 33.20 0.625 122.3 285.7 163.4 0.266 0.599 35 72.0 57.3 0.03033 1.48 32.97 0.676 125.0 287.0 16Z0 0.272 0.598 40 78.0 63.3 0.$055 1.37 32.73 0.730 128.0 288,3 160.3 0.278 0.597 45 84.6 59.9 0.03078 1.27 32.49 0.787 131.1 289.5 158.4 0.285 0.596

50 91.8 77 .1 0.08102 1.18 32.24 0.347 154.2 290.7 156.$ 0.292 0.596 55 99.3 34.6 0.03125 1.10 32.00 0.909 137.2 292.0 154.3 0.298 0.596 60 107.1 92.4 0.03150 1.01 31.75 0.990 140.6 293.2 152.6 0.306 0.595 65 115.4 100.7 0.03174 0.945 31.50 1.06 143.8 294.5 150.7 0.313 0.594 70 124.0 109.3 0.08201 0.883 $1.24 1.13 147.5 295.3 148.3 0.321 0.594 75 133.2 118.5 0.03229 0.825 30.97 1.21 150.3 296.9 146.6 0.327 0.594

80 142.3 128.1 0.03257 0.770 30.70 1.30 154.0 299.1 145.1 0.335 0.593 85 153.1 138.4 0.03287 0.722 30.42 1.39 157.0 299.2 142.2 0.342 0.593 90 164.0 149.0 0.03317 0.673 $0.15 1.49 160.3 $00.3 140.0 0.349 0.593 95 175.0 160.0 0.03348 0.632 29.87 1.58 163.4 301.3 137.9 0.356 0.592

100 187.0 172.0 0.03381 0.591 29.58 1.69 166.8 302.4 135.6 0.363 0.,592 105 200.0 185.0 0.03416 0.553 29.27 1,81 169.8 303.2 133.4 0.370 0.592 110 212.0 197.0 0.05453 0.520 28.96 1.92 172.8 304.0 131.2 0.376 0.591 115 226.0 211.0 0.03493 0.488 28.63 2.05 176.2 304.7 128.5 0.383 0.590 120 240.0 225.0 0.03534 0,459 28.30 2.18 179.8 305.2 125.4 0.391 0.589

125 254.0 239.0 0.03575 0.432 27.97 2.31 185.5 $05.8 122.$, 0.399 0.588 150 272.0 257.3 0.08618 0.404 27.64 2.48 186.8 306.1 119.$ 0.406 0.587 135 288.0 273.3 0.05662 0.382 27.32 2.62 190.0 306.3 116.3 0.413 0.586 140 $05.0 290.3 0.03707 0.$60 27.00 2.78 194.0 $06.5 112.5 0.422 0.585

+ Based on material from Dana, Jenkins, Burdick and Tlrnm, published originally in REFRIGERATING ENGINEERING, June. 1926, Vol. 12. No. 12, Page 405.

* Inches of mercury below one standard atmosphere (29.92 in.). ** From Mollier Diagrams for Propane, W. C. Edinister, Standard Oil Co. (Indiana).

Temp Deg.

Ft

-75 -70 -65 -60 -55

-50 -45 -40 -35 -30

-25 -20 -15 -10 -5

0 -5 10 15 20

25 30 35 40 45

50 55 60 65 7O 75

80 85 90 95

100 105 110 115 120

125 130 135 140

813

N F P A 54 ~ A96 R O P

T a b l e 4. Thermodynamic Properties of Saturated Propane

E n t h a l p i e s a n d E n t r o p i e s a r e r e f e r r e d to s a t u r a t e d l i q u i d at - 2 0 0 F. where the values are z e r o . R e f e r to Fig. 1 for Enthalpies and Entropies of s u p e r h e a t e d p r o p a n e vapor .

I I [ ~ i ~ i I l L _ ~ , ifiIIl~ ~ i~ '~ '~]

~ k X : : _ _ l i i ~ I~! i~i I i ' '~.1~1 I ~ _ ' ~ I I ~ J 11 ~IE~I I~O]

I ~ ~ ~ I ~ '~I::--~' I 6

~ ~ I ~ I ~ I ~ l~I,: --II~ III~ I~ f i l l F_ 2IIlgl I~II; gI,~

~ , Ie~.l I ~ I I ~ I ~ I ~ I ~ I~ :':-mw~-~ I ~

m m IOCgmm i I m ~ m ~ I m m m l ~ I m l m m m ~ , ~ l m m l m m m ~ . ~ I m l IV~Xz~m m m l ~ I m m m m m v . ~ Imml m m m ~ * ~ n m ~ i a B ~ m m m m l ~ M m m m m , ~ m m n m l ~ m Imlrmm m m l ~ m I m m ~ m m ~ , ~ m ~ I I I i I ~ I I / m I i i t , l ~ rmI l , ~ I l i I r I

I ' o~ r r~ I i i ~ l a inlmi O K I ~ l a H

IO~ ,z~ i i I ~ a i g r l H ~ I I / m ~ H ~ I i I I ) i ilOl~r:!mm I I / ~ I 'Or , ]~ i I I I ~ I i tml I I ' e ~ ] ~ : I I I a I I e m Irt~[~;~I I I g I I l m I

I O m : I I I / l ~ I ' O ~ I I I ~ . l I T U ~ I I d I I I d l

I ~ k ~ ; ' l I I I I G ~ I i l g I I + Based on material from Dana, Jenkins, Burdick and Timm, published otiginally in REFRIGERATING ENGINEERING, June.1926, Vol. 12,

No. 12, 402. * Inches of mercury below one standard ammsphere (29.92 in.).

** Moiler Diagrams for Burane. W. C. Edmister, Standard Oil Co. (Indiana).

(Log #98) 54- 3 - (1.1.1 (b) and 2.5.3): Accept in Principle SUBMITTER: Eric Moorehead, The M. W. Kellogg Company RECOMMENDATION: The Proposed Rule Changes, which are set in the Enclosure would relocate non-fuel gas applicat ions into NFPA 58.

The Proposed NFPA 54 Interpretat ion is set out in the Enclosure. SUBSTANTIATION: T he existing text per ta in ing to "research or deve lopment applications" has no reasonable application or relat ionship to non-fuel uses of "fuel gas".

NOTE: Suppor t ing material is available for review at NFPA Headquarters .

i COMMITTEE ACTION: Accept in Principle. Revise 7 to read: 7. Large in tegrated chemical plants or port ions of such plants

where f lammable or combust ible liquids or gases are p roduced by chemical reactions or used in chemical reactions. COMMITTEE STATEMENT: The Commit tee believes that the change to 1.1.1 (b).7 will enable pilot plants to be exc luded f rom the Code.

(Log #CP17) 5 4 - 4 - ( l . l . l ( b ) . 1 8 (New)): Accept SUBMITTER: National Fuel Gas Code Commit tee I RECOMMENDATION: Add a new 1.1.1 (b).18 to read:

18. Fuel gas systems on recreational vehicles manufac tu red in accordance wifl] NFPA 501C, Standard for Recreational Vehicles.

SUBSTANTIATION: To clarify tha t recreational vehicles are no t covered by the National Fuel Gas Code. COMMITTEE ACTION: Accept.

(Log #CP45) 54- 5 - (1.4): Accept SUBMITTER: National Fuel Gas Code Commit tee RECOMMENDATION: Add the word "testing" after the word, "installation" in the first sen tence and after the word "installation" in (a) and (b) u n d e r 1.4. SUBSTANTIATION: To clarify tha t test ing should be pe r fo rmed by a qualified agency. COMMITTEE ACTION: Accept.

(Log #2) 54 -6 - (1.5.2): Reject Note: This proposal appea red as c o m m e n t 54-11 which was held for

fur ther study f rom the Annual 92 TCD, which was on proposal N/A. SUBMITrER: Ar thur H. Kuhnz, Wisconsin Public Service Corp. RECOMMENDATION: Add the following text:

"except in the case of an emergency shut off". SUBSTANTIATION: W h e n tu rn ing of fgas before relighting in an emergency shut off situation, it is not practical or possible to tu rn off appliance shut-offvalves. T ime is of the essence and m an y houses are locked (no home) . This precaut ion should be taken before relighting. Person shall observe mete r test dial for m o v e m e n t after t u rn ing meter on.

814

N F P A 54 - - A 9 6 R O P

COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: 1.5.2 does not apply to an emergency shutoff situation. It specifically states that it is applicable to service, installation, repair, replacement and maintenance.

(Log #4) 54- 7 - (1.7): Accept in Part Note: This proposal appeared as comment 54-33 which was held for

fur ther study from the Annual 92 TCD, which was on proposal 54-5. SUBMITTER: Marlow I. Kroninger, Topton, PA RECOMMENDATION~ The description should read:

"A gas appliance for food preparation incorporating one or more cooking function(s)."

Revise Item C as follows: "Floor Suppor ted Unit. A cooking appliance for installation

directly on the floor without requiring support ing cabinetry or structure. It may provide one or more cooking function(s)." SUBSTANTIATION: These changes will be consistent with the description in Z21.1-1990. COMMITI'EE ACTION: Accept in Part. COMMITI'EE STATEMENT: It is not completely clear to the committee what the submitter is requesting in his first proposal. The committee also agrees that the presendy specified three cooking functions should be retained.

The committee did agree to revise the definition for "c Floor Mounted Unit" to "Floor Supported Unit" to be consistent with Z21.1-1990.

(Log #CP40) 54-8- (1.7): Accept SUBMITTER: National Fuel Gas Code Committee RECOMMENDATION: Delete definitions for first and second stage regulators in the Code. SUBSTANTIATION: These regulators have been deleted from the scope of the code in Proposal 54-39 (Log #CP42). COMMIT'fEE ACTION: Accept.

(Log #3) 54- 9 - (1.7 Accessible, Readily): Reject Note: This proposal appeared as comment 54-22 which was held for

furdler study from the Annual 92 TCD, which was on proposal N/A. SUBMITTER: B. Wayne Jackson, Manufacture of Exact-Air RECOMMENDATION: Revise text as follows:

"Accessible, Readily. Having direct access without the need for tools or special knowledge." SUBSTANTIATION: Listing specifics rather than a comprehensive phrase, resulted in a definition that is inadequate, incomplete and controversial.

To specifically list subject items inadvertently mentionables of dire importance are excluded. To Wit: Height above floor could require a ladder (a tool) as could an under floor or attic space through a hinged door (openable).

The r ecommended change is concise, all encompassing and better ualifies to serve for the definition. OMMrl'TEE ACTION: Reject.

COMMITTEE STATEMENT: The committee believes that the words, "special knowledge" are vague and undefinable.

(Log #CP46) 54-10- (1.7 Agency, Qualified (New)): Accept SUBMITTER: National Fuel Gas Code Committee RECOMMENDATION: Add "Agency, Qualified" under 1.7 definitions and state, "See 1.4." SUBSTANTIATION: Refer to Committee Action on Proposal 54-5 (Log #CP45). COMMITTEE ACTION: Accept.

(Log #7) 54- 11 - (1.7 Air Condit ioning and Heat Pump (New)): Accept Note'o This proposal appeared as comment. 54-48 which was held for

fur ther study from the Annual 92 TCD, which was on proposal 54-11. SUBMITTER: Tony Demases, Lone Star Gas Co. RECOMMENDATION: Revise the definition of Air Conditioning and add a new definition of Heat pump:

Air Conditioning. The t reatment of air so as to control simultaneously its temperature, humidity, cleanness, and distribution to meet the requirements of a condit ioned space. Air Conditioner, Gas Fired. A gas burning, automatically-operated

appliance for supplying cooled a n d / o r dehumidif ied air or chilled liquid.

Heat Pump, Gas Fired. A gas burning, automatically-operated appliance utilizing a refrigeration system for supplying either heated air or liquid, or heated a n d / o r cooled air or liquid. SUBSTANTIATION: The revised definitions are needed to prevent confusion and will correlate with a proposed Z21 Gas and Condition- ing Standard. COMMITrEE ACTION: Accept. COMMITTEE STATEMENT: The committee agreed to add the definitions for "Air Conditioner, Gas-Fired" and "Heat Pump, Gas- Fired" to be consistent with the Z21.40.1 standard.

(Log #CP 15) 54- 12 - (1.7 Anodeless Riser, Design Certification, Service Head Adapter (New)): Accept SUBMITTER: National Fuel Gas Code Committee RECOMMENDATION: Add definitions:

Anodeless Riser. A transition assembly where plastic piping is

~ ermitted to be installed and terminated aboveground outside of a uilding. The plastic piping is piped from below grade to an

aboveground location inside a protective steel casing and terminates in either a factory-assembled transition fitting or a field-assembled, service head, adapter-type transition fitting.

Design Certification. The process bywhich a product is evaluated and tested by an independen t laboratory to affirm that the product design complies with specific requirements.

Service Head Adapter. A transition fitting for use with plastic piping (that is encased in non-pressure-carrying metal pipe) which connects the metal pipe casing and plastic pipe and tubing to the remainder of the piping system. SUBSTANTIATION: These new definitions are needed with the revisions to 2.6.4 and 3.1.5. COMMITrEE ACTION: Accept.

(Log #6) 54- 13 - (1.7 Appliance Categorized Vent Diameter /Area (New)): Accept in Principle Note: This proposal appeared as comment 54-47 which was held for

fur ther study from the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: Robert Borgeson, American Gas Assn Labs RECOMMENDATION: Add a new defit~ition as follows:

"Appliance Categorized Vent DiameterTArea. The minimum vent d iameter /a rea permissible for Category I or II appliances to maintain a nonpositive vent staticpressure when tested in accordance with a nationally recognizedstandard." SUBSTANTIATION: This term is used in the notes of the proposed Part 11 and needs definition.

The term is used in Section 11.2, Notes 8 and 10 and Section 11.3, Notes 13 and 17. The definition has also been adopted by the ANSI/CGAJoint Central Furnace Subcommittee on July 8, 1991. COMMITTEE ACTION: Accept in Principle.

The Committee agrees with the submitter 's proposal, except to delete the words, "or If" and revise the tide of the definition in Part 11 to be consistent with this definition. COMMI'VI'EE STATEMENT: To correlate with terminology used in Part 11.

(Log #229) 54- 14- (1.7 Carbon Steel): Accept SUBMITTER: Richard A. Hoffmann, P.E., Hoffmann & Feige, Inc. RECOMMENDATION: Suggested revision to the Carbon Steel Definition contained in Section 1.7 of NFPA 52-1992.

Carbon Steel. An alloy consisting generally of iron and carbon. The accompanying e lement contained therein usually consist of si l icon, manganese, sulfur and phosphorus. The presence of other elements may define a low alloy steel, which would have significantly different properties than a plain carbon steel.

815

N F P A 5 4 - - A 9 6 R O P

SUBSTANTIATION: The present definition is taken directly form the Metals Handbook - 10th Edition -Vol. ** It is too encompassing and complex. The proposed revision is more in line with the products used in this s tandard and allows a better unders tanding by the layman. The in** of the the definition of carbon steel should be limited to a product that contains just iron and carbon plus the normal elements with the melting and refining process.

I COMMITTEE ACTION: Accept. Accept and substitute "elements" for "element".

COMMITTEE STATEMENT: Accepted with an editorial correction.

(Log #161) 54- 15 - (1.7 Draft Hood): Accept SUBMITTER: Wilbur L. Haag, Jr., A. O. Smith Water Products Company RECOMMENDATION: Revise opening sentence of the draft hood definition to:

"A non-adjustable device built into ..." SUBSTANTIATION: This will fur ther point out the difference between a draft hood and a draft regulator. COMMITTEE ACTION: Accept.

(Log #203) 54- 16 - (1.7 Draft Regulator): Reject SUBMITTER: J. C. Cosgrove, Total Energy Concepts RECOMMENDATION: Revise text as follows:

"Draft Regulator. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value during both on and off cycles." SUBSTANTIATION: Energy Saver/Fuelbuster has been called a restrictive device simply because of construction which inserts a redirector plate into ~levice. As claimed in four patents, devices are actually expansive not restrictive due to fact that they at no time reduce the cross sectional area of flue system. Draft control is automatically achieved by directing flue gases through adjacent chamber with larger cross sectional area which reduces effective draft forces prior to returning to original flue system.

In the past, nearly 100,000 such devices have been successfully installed and are achieving both energy savings and proport ional emissions reductions. The energy saver is installed according to manufacturers specification by qualified contractors who are required to verify drafting conditions both before and after installation in order to assure safe and proper operation of covered appliance.

Although many utilities and government agencies are satisfied with CGA Certification presently existing and have no objections to installation of energy Saver/Fuelbuster units according to manufacturers instructions, others however as policy require AGA Certifica- tion. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-193 (Log #204~.

(Log #5) 54-17- (1.7 Floor Supported Unit): Accept in Principle Note: This proposal appeared as comment 54-34 which was held for

fur ther study from the Annual 92 TCD, which was on proposal 54-5. SUBMITTER: Terry Coil, Southern CA Gas Co. RECOMMENDATION: Change to "Floor Supported Unit." SUBSTANTIATION: To be consistent with the recently adopted definition in ANSI Z21.1. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-7 (Log #4).

(Log #160) 54- 18 - (1.7 Proprietary Type Joints (New)): Reject SUBMITTER= James IL Cole, Columbia Gas Distribution Compa- nies RECOMMENDATION: Define "proprietary type joints" as used in section A~2.6.8(d).9. Include the definition in Section 1.7, "Defini- tions". SUBSTANTIATION: Problem:

The definition of proprietary type joints cannot be found in any support ing literature.

COMMYITEE ACTION: Reject. COMMITTEE STATEMENT: The proposal does not provide a specific revision or substantiation. A proprietary fitting is one that is manufactured by a small number of manufacturers for specific uses. Examples are Corrugated Stainless Steel Tubing fittings and special fitdngs used for very high pressure gases.

(Log #110) 54-19 - (1.7 Regulator, LP-Gas): Reject SUBMITTER: TyV. Lotz, National Propane Gas Association RECOMMENDATION: 1-7 Definitions.

Regulator, LP-Gas, Fkst Stage - C;2 ~ , , ~ : ' ~ , ~ "~ C.ao ~)~z~,,,~, d,~ " " " " ~ ' '" " " ' 'i" are A pressure regulator for LP-Gas vapor service designed to reduce container pressure to 10.0 psig or less.

pez . . . . . Z~ ~Gli~g~,, v . . . . . . . A pressure regulator for LP-Gas vapor service designed to reduce first stage regulator outlet pressure to 14 in. W.C. or less. SUBSTANTIATION: Definitions for LP-Gas regulators are being revised to be consistent with the proposed definitions in NFPA 58. COMMITI'EE ACTION: Reject. C O M M I T r E E STATEMENT: The Committee agrees that scope changes in the Code places the proposed definitions for first and second stage regulators outside of the scope of the code.

(Log #189) 54- 20 - (1.7 Regulator, LP-Gas): Reject SUBMITTER: BruceJ. Swiecicki, National Propane Gas Association RECOMMENDATION: Revise text as follows:

"Regulator, LP-Gas, First Stage. G.. uud~l~z~d LP-C..,o ~ozc,,,o, d,c ,",, o t v . . . . . . . . ~ul,z . . . . d u d , , s d,c otv, a~ . . . . . "~; . . . . v . . . . . . . . A

pressure regulator for LP-Gas vapor service designed to reduce container nressure to 10.0 nsi~ or less. Regulatgi;, LP.Gas.Secona SLxge..% :;.~c ~.~. ~,~cs.~fc, c g-~.laz~: f . f

p,'¢ . . . . . t - ~ IRiz,,d,,,J t', c~u, c. A oressure regulator for LP-Gas vapor service d e s i s t e d ~;o reduce fibst sta~e re~allator outlet pressure to 14 in. W.C. or less." SUBSTANTIATION: Definitions for LP-Gas regulators are being revised to be consistent with the proposed definitions in NFPA 58. C O M I ~ T T E E ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-19 (Log #110).

(Log #CP49) 54- 21 - ('1.7 Regulator, LP-Gas): Accept SUBMITTER: National Fuel Gas Code Committee RECOMMENDATION: Delete definitions for "Regulator, LP-Gas, First Stage" and "Regulator, LP-Gas, Second Stage" SUBSTANTIATION: The above definitions have been deleted from the Code as there is no longer coverage for first and second stage pressure regulators in the Code ba sedon revisions to the scope of the Code. COMMITTEE ACTION: Accept.

(Log #112) 54-22- (1.7 Space, Confined): Reject SUBMITTER: Russel Iwan, Metropolitan Utilities District RECOMMENDATION: DELETE: Space, Confined. For the purposes of this code, a space whose volume is less than 50 cuf t per 1,000 BTU per hr (4.8 m 3 p e r kW) of the aggregate inpnt rating of all appliances installed in that space. SUBSTANTIATION: After visiting with officials at NFPA, AGA, and GRI, I cannot f ind anyone that can come up with the technical data to substantiate this definition. I believe that with the technical advancement of gas-fired equipment , new research is needed to determine how a confined space is to be defined. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: There is not adequate technical substantiation for the proposal.

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N F P A 54 - - A 9 6 R O P

(Log #113) 54- 23- (1.7 Space, Unco r~ned ) : Reject SUBMITTER: Russel lwan, Metropolitan Utilities District RECOMMENDATION: DELETE: Space, Unconfined. Fo r the purposes of this code, a space whose volume is not less than 50 cu f t per 1,000 BTU per hr (4.8 m 3 per kW) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconf ined space. SUBSTANTIATION: Alter visiting with officials at NFPA, AGA, and GRI, I cannot f ind anyone that can come up with the technical data to substantiate this definition. I believe that with the technical advancement of gas-fired equipment, new research is needed to determine how an unconf ined space is to be defined. COMMITTEE ACTION: Reject. COMMITTEE STATEM~LNT: There is not adequate technical substantiation for the proposal.

(Log #205) 54- 24 - (1.7 Vent Damper Device, Automatic): Reject SUBMI'rlIER: j . (3. Cosgrove, Total Energy Concepts RECOMMENDATION: Revise text as follows:

"A non mechanical device in tended for installation in the venting system, in the outlet of or downstream of the appliance draft hood of a individual automatically operated fuel-gas burn ing appliance which is designed to au~o,~dc,,ily ,,e~,~ ~I,~ ;c,,Zhig ~zotc,~, ,,hc,~ d,~

reduce draft continuously by means of redirecting vent cases by means of a fixed nlate through chamber with cross sectional area lar~er than flue then instantaneously back to ori~inai flue section." SUBSTANTIATION: Energy Saver/Fuelbuster fins been called a restrictive device simply because of construction which inserts a redirector plate into device. As claimed in four patents, devices are actually expansive not restrictive due to fact that they at no time reduce the cross sectional area of flue system. Draft control is automatically achieved by directing flue gases through adjacent chamber with larger cross sectional area which reduces effective draft forces prior to returning to original flue system.

In the past, nearly 100,000 such dexa~ces have been successfully installed and are achieving both energy savings and proportional emissions reductions. The energy saver is installed according to manufacturers specification by qualified contractors who are required to verify drafting conditions both before and after installation in order to assure safe and proper operation of covered appliance.

Although many utilities and government agencies are satisfied with CGA Certification presently existing and have no objections to installation of energy Saver/Fuelbuster units according to manufacturers instructions, others however as policy require AGA Certifica- tion. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-193 (Log #204).

(Log #8) 54- 25 - (2.4.2): Reject Note: This proposal appeared as comment 54-59 which was held for

fur ther study fi'om the Annual 92 TCD, which was on proposal 54-19. SUBMITTER: JamesJ . Glanville, Denver Bldg. Inspection Dept. RECOMMENDATION: In the third paragraph delete the following:

"... If, however, a diversity of load can be established, smaller sized piping may be used." SUBSTANTIATION: Piping should always be sized for the total connected loadas aworse case scenario for safety reasons. Diversity is theoretical at best. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-26 (Log #9).

(Log #9) 54-26- (2.4.2): Rejeo Note: This proposal appeared as comment 54-60 which was held for

fur ther study from the ,Manual 92 TCD, which was on proposal 54-19. SUBMITTER: Jeffrey D. Hilleary, Denver Bldg. Dept. Engineering RECOMMENDATION: Eliminate sentence reading:

"If, however, a diversity of load can be established, smaller sized piping may be used."

SUBSTANTIATION: ff a diversity could be established (certainly no t for any heating application) it would always be subject to change at a site without knowledge of the designer or code official. Downsizing pipe for gas based on a diversity, (However valid at the time) cou l dbe hazardous should all gas fired devices call for full load simultaneously. COMMI]~rEE ACTION: Reject. COMMITrEE STATEMENT: The Committee believes that diversity of load is a valid criteria in pipe sizing. The submitter provides no substantiation that a problem exists.

(Log #172) 54- 27 - (2.5.1): Reject SUBMITTER: Robert G. Meyers, Long Island Lighting Co. RECOMMENDATION: Revise text as follows:

". . .piping systems located either inside or outside of buildings..." SUBSTANTIATION: We believe any piping exceeding 5 psig should be welded. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The submitter provides no substantiation that a safety problem exists in outdoor installations.

(Log #114) 54-28- (2.6.3(c)): Reject SUBMITTER: Russel Iwan, Metropolitan Utilities District RECOMMENDATION: DELETE: 2.6.3 Metallic Tubing.

(c) Aluminum alloy tubing small comply with specification for Aluminum-alloy drawn seamless tubes. ASTM B210, or specification for Aluminum-alloy seamless pipe and seamless ex t rudedtube , ASTM B241. Aluminum-alloy tubing shall be coated to protect pa~ns t external corrosion where it is in contact with masonry,

ter, or insulation, or is subject to repeated wettings by such liquids as water, detergent, or sewage. Aluminum-alloy tubing shall not be used in exterior locations of underground. SUBSTANTIATION: We have found that after a period of time, aluminum tubing gets very brittle and will break if moved. Alumi- num tubing should not be allowed for gas piping. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Committee is reluctant to delete all use of aluminum, which is optional, without substantiation that a real problem exists.

(Log #144) 54- 29 - (2.6.4): Accept in Principle SUBMITTER: James A. Clark, National Fuel Gas RECOMMENDATION: Revise text as follows:

2.6.4 Plastic Pipe, Tubing and Fittings. Plastic pipe, tubing and fittings shall b~ uocd v,~,~d~ a,~d~,~s . . . . . d ¢,,A z ~~I' ~ with Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings, ASTM D2513. Pipe to be used shall be marked "gas" and "ASTM D2513". SUBSTANTIATION: This s tatement prohibits the use of inserted risers and service head adapters which is permissible by D.O.T. 192.375. Many gas utilities presently use inserted risers and service head adapters to eliminate the use of steel pipe for this final tie-in point. How is a homeowner or plumber expected to cathodicaily protect and monitor this short section of steel pipe which is either next to his house or inside the foundation wall? Inserted risers and service head adapters eliminate this short piece of gas carrying steel pipe.

NOTE: Supporting material is available for review at American Gas Association Laboratories and NFPA Headquarters. COMMITrEE ACTION: Accept in Principle.

1. Revise 2.6.4 to read: 2.6.4 Plastic Pipe, Tubing, mad Fittings. Plastic pipe, robing, and

fittings shall be used outside underground only and shall conform with Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings, ASTM D2513. Pipe to be used shall be marked "gas" and "ASTM D2513." Anodeless risers shall comply with the following: (a) Factory-assembled anodeless risers shall be recommended for

the gas used and shall be leak tested by the manufacturer in accordance with written procedures.

(b) Service head adapters andfield-assembled anodeless risers incorporating service head adapters shall be r ecommended for the gas used by the manufacturer and shall be design certified to meet

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N F P A 54 - - A 9 6 R O P

the requ i rements o f Category I of ASTM D2513, and U.S. Depart- m e n t of t ransportat ion, Code of Federal Regulations, Title 49, Part 192.281 (e). The manufac tu re r sha l lprovide the user qualified installation instruct ions as p resc r ibedby U.S. Depar tmen t of Transportat ion, Code of Federal Regulation, Title 49, Part 192.283(b). The use of plastic pipe, t u b i n g a n d fittings in und i lu ted liquefied

pe t ro leum gas piping systems shall be in accordance with Standard for the Storage and Handl ing of Liquefied Pet ro leum Gases, ANSI/ NFPA 58. COMMITTEE STATEMENT: The revisions accomplish the in tent of the proposal to permi t the use of risers and service head adapters. The text is mode led after NFPA 58-1995.

(Log #137) 54- 30 - (2.6.8(d)): Reject SUBMITTEI~ Richard C. Sekerchak, D o r m o n t Manufac tur ing Company RECOMMENDATION: Add new text:

"Close nipples shall no t be used in fuel gas systems, gas supply lines, or to adapt f rom female th read to male th read in fuel has systems." SUBSTANTIATION: Close nipples can not be t ightened or loosened directly since there is no wrench grip area. Applying a wrench to the nipple damages the thread and can result in distortion of the fitting, fit t ing threads, and leakage. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: To tile Commit tee ' s knowledge close nipples are used a n d are somet imes needed . While they f r equendy are destroyed dur ing removal. This is no t a safety hazard. The reuse of componen t s is covered u n d e r 2.6.1 (b).

(Log #10) 54- 31 - (2.6.11 (a).2): Reject Note: Tiffs proposal appea red as c o m m e n t 54-72 which was he ld for

fur ther study f rom the Annua l 92 TCD, which was on proposal 54-23. SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Delete 2.6.11 (a).2 Asbestos; a n d SUBSTANTIATION: There is a quest ion of legality in anthor iz ing the use of asbestos in applications covered by this code. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: No substant iat ion is provided to demons t ra te tha t the use of asbestos in gaskets is a safety problem.

(Log #11) 54- 32 - (2.7.3): Reject Note: This proposal appea red as c o m m e n t 54-73 which was he ld for

fur ther study f rom the Annua l 92 TCD, which was on proposal 54-28. SUBMITTER: Enno Toomsalu, Underwri ters Laboratories Inc. RECOMMENDATION: Delete the second sentence. SUI~TANTIATION: Mobile h o m e installations are no t u n d e r file scope of this Code. They are unde r the scope of the Standard for Firesafety Criteria for Manufac tured H o m e Installations, Sites, and Communi t ies , NFPA 501A. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Commit tee believes that the coverage is n e e d e d for gas installers.

(Log #l 71) 54- 33 - (2.8.4): Accept in Principle SUBMITTER: Paul A. Cama, Long Island Light ing Company RECOMMENDATION: Add new text:

"Acceptable Vent Piping mater ia ls , jo in ing me t hods and components shall be in accordance with Section 2.6." SUBSTANTIATION: Clarify Field concerns. Specify acceptable materials and jo in ing me t hods to use when installing Vent Piping f rom Regulators. COMMITrEEACTION: Accept in Principle.

Add the following to 2.8.4 (a). l (before Exception): "Materials for vent p ip ing shall be in accordance with 2.6."

COMMITrEE STATEMENT: T he proposal is accepted with an editorial revision.

(Log #CP43) 54- 34 - (2.8.4): Accept SUBMITTERa National Fuel Gas Code Commit tee RECOMMENDATION: Delete the words, "Including Second stage LP-Gas regulators." f rom the title. SUBSTANTIATION: Refer to Commit tee Action on Proposal 54-39 (Log #CP42). COMMITTEE ACTION: Accept.

(Log #12) 54- 35 - (2.8.4(a).1 Exception): Reject Note: This proposal appea red as c o m m e n t 54-74 which was he ld for

fu r ther study f rom the Annual 92 TCD, which was on proposal 54-19. SUBMITTER: J o h n H. Frantz, Phi ladelphia Electric Co. RECOMMENDATION: Revise text as follows:

Exception: A regulator and vent l imiting means combinat ion listed as complying with the Standard for G~s Appliance Pressure Regulators, ANSI Z21.18, may be used without a vent to the outside, provided the regulator and vent l imiting means are installed in a ventilated location. (See Definitions, Section 1.7, Space Uncon- fined). SUBSTANTIATION: T h e terminology Venti lated Location, as it applies to line gas pressure regulators equipped, with a vent. .limiting means, has often created confusion and misunder s t and ing in the field. To el iminate this misunder s t and ing it is reques ted tha t the Z223.1 Commi t tee consider fur ther def in ing what constitutes a Venti lated Location when a line gas pressure regulator, equ ipped with a vent l imiting means, is installed.

it is recognized tha t the provisions set for th in Section 5.3, Air for Combus t ion and Ventilation, are specific requi rements for gas utilization e q u i p m e n t and no t for a location where a line gas pressure regulator is the only device installed requir ing ventilation. Therefore, parameters are needed . It is reques ted that the Commi t t ee consider applying the existing defini t ion of "SPACE, UNCONFINED" when de te rmin ing what constitutes a ventilated location. COMMrlq'EE ACTION: Reject. COMMITrEE STATEMENT: Refer to Commit tee Action on Proposal 54-37 (Log #206).

(Log #13) 54- 36 - (2.8.4(a).1 Exception): Reject Note: This proposal appea red as c o m m e n t 54-75 which was held for

fu r ther study f rom the Annual 92 TCD, which was on proposal 54-19. SUBMITTER: Dale Watterson, Madison Gas & Electric RECOMMENDATION: Revise text as follows:

"A regulator and vent ... provided the regulator and vent limiting means are no t installed in a ventilated location conf ined space." SUBSTANTIATION: Since '~¢entilated location" is n o t def ined in the code and "confined space" is defined, en fo r cem en t would be easier. On 2 PSI systems the vent l imiting device is often fo u n d used in small sealed furnace closets. COMMITI'EE ACTION: Reject. COMMITI'EE STATEMENT: Refer to Commit tee Action on Proposal 54-37 (Log #206).

(Log #206) 54- 37 - (2.8.4(a).1 Exception): Reject SUBMITTERa James A. Ranfone, Amer ican Gas Association RECOMMENDATION: Revise the exception in section 2.8.4(a).1 as follows:

Exception: A regulator and vent l imiting means combinat ion listed as complying with Standard for Gas Appliance Pressure Regulators. ANSI Z21.18, shall be permi t ted to be used without a vent to the

SUBSTANTIATION: The s tandard for regulators, ANSI Z21.18, limits the m a x i m u m allowable gas flow rate which does not justify a code r equ i r emen t for a ventilated location. In addition, there is no defini t ion for "ventilated location" conta ined in NFPA 54. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: The commit tee believes that some ventilation is requi red a n d that removal of the text could lead to installations in completely unvent i la ted areas.

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N F P A 54 - - A 9 6 R O P

(Log #14) 54 -38 - (2.8.7): Reject Note: This proposal appea red as c o m m e n t 54-77 which was held for

fur ther study f rom the Armual 92 TCD, which was on proposal N/A, SUBMITTER: William S, Bigelow, Bigelow Associates RECOMMENDATION: A m e n d 2.8.7 to read as follows:

2.8.7 Second Stage LP-Gas Regulators. Second stage regulators on und i lu ted liquefied pe t ro leum gas piping systems shall comply with the Standard for Pressure Regulat ing Valves for LP-Gas, ANSI /UL 144. SUBSTANTIATION: The installation of second stage LP-Gas regulators is covered unde r the auspices o f ANSI Z223,1/NFPA 54 (see 1.1.1 (a) . l ) and not ANSI/NFPA 58. COMMITTEE ACTION: Reject.

Delete 2.8.7. COMMITTEE STATEMENT: The Commit tee agrees that the proposal for second stage regulators is no longer valid since changes to the scope of the Code place second stage regulators outside of the scope of the Code.

(Log #CP42) 54- 39- (2.8.7): Accept SUBMITTER: National Fuel Gas Code Commit tee RECOMMENDATION: The Commit tee agrees that coverage for second stage regulators (2.8.7) should be deleted based on changes to the scope of the Code which place second stage regulators outside of the scope of the C o d e . SUBSTANTIATION: The Commit tee made revisions to the scope of the Gode in Proposal 54-1 (Log #CP16) that places first and second stage regulators outside of the scope of the Code. C O M M I T r E E ACTION: Accept.

(Log #108) 54- 40 - (2.9.1(b)): Reject SUBMITTER: Ronald A.Jordan, Division of Electrical Engineer ing RECOMMENDATION: The Engineer ing Sciences staff recom- m e n d s that the provisio,~ in question, at a m i n i m u m , be deleted f rom the code for residential installations. This could be accom- pl ished by revising the first line of Section 2.9.1 (b) as follows:

"(b) For non-residential installations, no pressure relieving or l imiting device is required i f . . . " SUBSTANTIATION: ~fhis r e commenda t i on represents the opinion of the CPSC Engineer ing Sciences staff and does no t necessarily represent the views of the Commission.

Section 2.9.1 (a) of the code deems a piping system to have adequate overpressure protect ion when it has "two acceptable devices (a service or line regulator plus one other device), each limiting the pressure to a value that does no t exceed the m a x i m u m working pressure of the downst ream system, both of which mus t fail s imultaneously in order to overpressure the downst ream system." Most residential natural gas installations fall into this category, which means that the cur ren t provisions encompass the protect ion of consumers .

The section at issue is Section 2.9.1 (b), which states that "No pressure relieving or limiting device is requi red if (1) the gas does not contain materials tha t could seriously interfere with the operat ion of the service: or line pressure regulator; (2) the operat ing pressure of the gas source is 60 psig or less; and (3) the service or line pressure regulator has all of the following design features or characteristics:

1. Pipe connect ions to the service or line regulator do not exceed 2 in. nominal diameter;

2. It is self-contained with no external static or control piping; 3. It has a s ing lepor t valve with an orifice d iameter no greater than

that r e c o m m e n d e d b y the manufac tu re r for the m a x i m u m gas pressure at the regulator inlet;

4. The valve seat is made of resilient material des igned to withstand abr,~ion of the gas, impuri t ies in the gas, and cutt ing by the valve, and to resist p e r m a n e n t deformat ion when it is pressed against the valve port; and

5. It is capable, unde r normal operat ing conditions, of regulat ing the downstream pressure within the necessary limits of accuracy and of limiting the discharge pressure u n d e r no-flow condit ions to not more than 150 percent of the discharge pressure main ta ined unde r flow conditions."

The Engineer ing Sciences staff's concern is that the highl ighted port ions of dais section require piping systems whose supply pressure is 60 psig or lower to h:ave only one overpressure protection device. By requir ing only one overpressure protection device, Section

2.9.1 (b) violates the in ten t of Section 2.9.1 (a), which is for piping systems to have adequate overpressure protection.

Inadequate overpressure protection, in the view of the Engineer ing Sciences staff, presents a preventable overpressurization hazard to the consumer . Some m a y a r g u e that overpressurization is no t a p rob lem in low pressure (i.e., gas delivery pressure u n d e r 60 psig) residential p ip ing systems, since the delivery pressure of the gas is already near the operat ing pressure of househo ld appliances. However, there are d o c u m e n t e d incidents in wh ichp rope r ty damage and loss of life have occurred as a result of the overpressurization of low pressure residential natural gas piping systems. In some of these incidents, the only overpressure protec- t ion device for a residence was the service regulator.

In one particular incident, a natural gas regulator vault in a low

~ ressure distr ibution system which served an entire ne ighborhood ad been taken out of service for main tenance . This vault had a

service regulator and a moni to r ing regulator in it with a by-pass valve in parallel with the vault. No o ther overpressure protect ion devices we're in the gas lines between the regulator vault and the individual homes. The homes tha t this vault suppl ied gas to did not have individual regulators outside of them.

It was alleged that a gas utility ma in tenance person o p e n e d the by- pass valve and did not moni to r the flow of gas dur ing the entire t ime that the by-pass valve was open. Dur ing this time, a surge in pressure caused unregula ted gas at an elevated pressure to low downst ream into the residential piping systems. This resulted in overpressurization of residential gas appliances which in tu rn caused explosions and fires t h r o u g h o u t the ne ighborhood . The property damage was extensive and three lives were lost. Engineer ing Sciences staff believes that the presence of service regulators and at least one addit ional overpressure protect ion device outside of each individual home could have prevented this accident and others like it that occur annually. C O M M I T r E E ACTION: Reject. COMMITTEE STATEMENT: The proposal is rejected since there is ongoing activity in response to r ecommenda t ions adopted by the Commit tee addressing the subject of overpressure protection.

The Commit tee notes that 2.9(b) does not apply to a gas service without a service or line pressure regulator, as the requi rements of (1), (2), and (3) mus t a l lbe me t for the exception to apply. The incident discussed in the proposal appears to be one in which there were no service regulators. Therefore, the substantiat ion as p resen ted does not suppor t the proposal.

(Log #15) 54-41 - (3.1.2(a)): Reject Note: This proposal appeared as c o m m e n t 54-86 which was held for

fur ther study from Annual 92 TCD, which was on proposal 54-32. SUBMITTER: J o h n H. Frantz, Philadelphia Electric Co. RECOMMENDATION: Revise text to allow the cover requ i rements to only be reduced to a m i n i m u m 12 in. with appropriate protection.

Proposed text: (a) Cover Requirements . U n d e r g r o u n d piping systems shall be

installed with at least 18 in. of cover. The cover may shall be permi t ted to be reduced to 12 in. if the pipe is installed in condui t or br idged (shielded). SUBSTANTIATION: This provision, as worded in the proposed text, does no t set a m i n i m u m cover requirement . It is s trongly believed that a reduct ion to 12 in. with protect ion should be clearly the m i n i m u m requ i remen t and no fur ther reduct ion should be considered. C O M M I T r E E ACTION: Reject. COMMITTEE STATEMENT: The submit ter provides no substantia- t ion that a problem exists.

(Log #16) 54 -42 - (3.1.3): Accept in Principle Note: This proposal appea red as c o m m e n t 54-87 which was he ld for

fur ther study from the Annual 92 TCD, which was on proposal 54-34. SUBMITTER: Paul G. Raymond, Cumber land , RI RECOMMENDATION: Revise text as follows:

"The gas supplier shall be consul ted for guidelines with respect to installation, ma in tenance and corrosion protect ion of u n d e r g r o u n d piping." SUBSTANTIATION: NACE Standard RP-01-69 would be no help or gu idance to the average plumber . Unless a person has knowledge of cathodic protection, it is very technical and states all work shou ld be unde r the surveillance of t ra ined and qualified personnel . I agree with tile basic principles of Log #103, but I feel it should let the

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N F P A 54 - - A 9 6 R O P

individual gas supplier, supply its requirements, if any, and assist the installer in design, installation and material selection.

Currently Customer-own lines and yard-lines are under attack. Congress is currently proposing new requirements for customer-own lines and in the State of Missouri, customer-own lines will be prohibited.

I have supplied a copy o f t recent magazine article pertaining to this issue, a copy of NACE RP~01-69 and a selection of the findings by the National Transportation Safety Board in respect to the fires and explosions in Kansas.

NOTE: Supporting material is available for review at NFPA Headquarters. COMMITTEE ACTION: Accept in Principle.

Relocate the note to 3.1.3 to Appendix A, and add the following: "Information on installation, maintenance and corrosion protec-

tion may be available from the gas supplier." COMMITTEE STATEMENT: To accept the suggestion in the proposal is accepted and located in Appendix A. The note is relocated to Appendix A also.

(Log #175) 54-43- (3.1.3): Reject SUBMITTER: Robert G. Meyers, Long Island Lighting Co. RECOMMENDATION: Add new text:

Provide specific definitions of "approved manner" of protecting against corrosion for underg round piping, viz. cathodic protection, wrapping, etc. SUBSTANTIATION: Specific guidance is requested, such as examples given above. COMMITI'EE ACTION: Reject. COMMITTEE STATEMENT: Tile proposal does no t make a specific proposal or provide substantiation for a change. The provision is intentionally written in performance terms, which may no t be appropriate for all installations.

(Log #145) 54- 44- (3.1.5)" Accept in Principle SUBMITTER: James A. Clark, National Fuel Gas RECOMMENDATION: Revise text as follows:

3.1.5 Connection of Plastic Piping. Connections between metallic and plastic piping shall b,_ a~adc , , , ' y ,,ua;~,Ic, audc , g. ~aad, , ,Jd conform with Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing and Fittings, ASTM D2513 Category 1 transition fittings. SUBSTANTIATION: This s tatement prohibits the use of inserted risers and service bead adapters which is permissible by D.O.T. 192.375. Many gas utilities presently use in 3.1.5 Connection of Plastic Piping. Connections. between, metallic, and plastic piping. shall conform vath Standard Specification for Thermoplasuc Gas Pressure Pipe, Tubing and Fittings, ASTM D2513 Category 1 transition fittings. Inserted risers and service head adapters to eliminate the use of steel pipe for this final tie-in point. How is a homeowner or p lumber expected to cathodically protect and moni tor this short section of steel pipe which is ei ther next to his house or inside the foundat ion wall? Inserted rises and service head adapters eliminate this short piece of gas carrying steel pipe.

NOTE: Support ing material is available for review at American Gas Association and NFPA Headquarters. COMMITrEE ACTION: Accept in Principle.

Revise 3.1.8 to read: 3.1.8 Plastic Pipe. (a) Plastic pipe shall be installed outside, underground only. Exception No. 1: Plastic pipe shall be permit ted to terminate

aboveground where an anodeless riser is used to terminate abovegrou nd.

Exception No. 2: Plastic pipe shall be permit ted to terminate with a service head adapter aboveground in buildings, including base- meats, where file plastic pipe is inserted in a piping material permit ted for use in buildings.

(b) Relocate 3.1.5 here. c. An electrically continuous corrosion resistant tracer wire (min

AWG 14) or tape shall be buried with tile plast icpipe to facilitate locating. One end shall be brought above g r o u n d a t a building wall or riser. COMMITFEE STATEMENT: The revisions accomplish the intent o f the proposal to permit the use of risers and service head adapters. The text is mode led after NFPA 58-1995.

(Log #154) 54- 45 - (3.1.5): Accept in Principle SUBMITTER: EdwardS. Schwartz, Joint Installation Standards Committee RECOMMENDATION: 1. Modify paragraph 3.1.5 of the NFGC to read as follows:

3.1.5 Connection of Plastic Piping. Connections between metallic and plastic piping shall be made only outside and underground using fittings which meet the requirements of 1 ) ASTM D2513 Category 1 transition fittings and 2) the testing and suitability requirements of paragraph 2.6.1 (c). Wallhead adaptors installed at the interior face of a building wall and prefabricated Anodeless Risers which extend above ground or through a building wall are acceptable if they meet the other requirements of this section.

2. Modify associated drawings and text of the NFGC handbook to correspond with proposal 1 above. SUBSTANTIATION: Prefabricated "riser fittings" which meet the requirements of 49 CFR 192.375 are regularly used by utilities in "buried plastic service lines" as inlets to outside meter sets and for " through the wall" plastic-steel transition fittings if the meter is inside. Transitions at the face of an interior wall are also achieved using "wall head adaptor fittings".

Such fittings are precluded, however, by paragraph 3.1.5 of the NFGC for use in "buried plastic lines" if the plastic to steel transition occurs above ground or at the face of an inside building wall - even if the plastic is protected by a protective sheath. In practice however, the operating environment for buried house lines and buried service lines are identical mad the prohibi t ion of such fittings by the NFGC should be lifted. COMMI[TrEE ACTION: Accept in Principle. COMMI'I*t'EE STATEMENT: Refer to Committee Action on Proposal 54-44 (Log #145)o

(Log #159) 54- 46 - (3.1.5 Exceptions No. 1 and 2 (New)): Accept in Principle SUBMITTER: James R. Cole, Columbia Gas Distribution Compa- nies RECOMMENDATION: Add new text as follows:

Exceotion 1: Plastic Dive may terminate above trround in a service riser t~Zarlsjtion fit~OIz ~lesi~ned for such use and annroved by the Authority HavingJu~sdicffon. " "

Exceofion 2: Under~round nlastic nine may terminate on the inside 'of a basement o r foundat ion vra'll in aia aooroved service-head adapter or "basement tee." "" SUliSTANTIATION: Service risers and service-head adapters are routinely installed by gas companies on plastic service lines operating at up to 60 PSIG. Many of these fittings make the transition from plastic to steel above g round (or inside the foundation wall) with a compression fitting, yet provide physical protection to the plastic. Since these fittings provide the preferred installation on service lines, their use on house lines should no t be prohibited. COMMITrEEACTION: Accept in Principle. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-44 (Log #145).

(Log #115) 54- 47 - (3.1.6): Reject SUBMITTER: Russei lwan, Metropolitan Utilities District RECOMMENDATION: Revise 3.1.6 to read as follows:

"Piping Through Foundation Wall. Underg round ferrous piping, where installed below grade through the outer foundat ion or basement wall of a building, shall be pr imed and wrapped and have cathodic protection." SUBSTANTIATION: Our experience has shown it is preferred to not encase fuel l ined below grading in a protective pipe as it is impossible to apply cathodic protection to piping inside a casing. Metallic casing can easily come in contact with the carrier pipe causing a short and a loss of cathodic protection. Coating or wrapping copper pipe below ground is not necessary. COMMITI'EE ACTION: Reject. COMMITI'EE STATEMENT: The Panel believes that the sleeve provides a margin of safety as it will convey any gas leakage to outside the building. Leaks can result f rom factors other than corrosion, such as mechanical stress resulting from foundation settling.

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(Log #116) 54-48- (3.2): Reject SUBMITTER: Russel Iwma, Metropolitan Utilities District RECOMMENDATION: Revise 3.2 to read as follows:

"Aboveground Piping Outside. Piping installed aboveground shall be securely supported and located where it will be protected from physical damage (Also see 3.1.4). Aboveground ferrouspiping through wood shall not be wrapped or sleeved, and shall be sealed at the outside wall only. Aboveground ferrous piping through concrete or brick shall be sleeved and sealed around the piping or prime, wrapped, and sealed at the outside wall. Wrap shall not extend more than an inch beyond the wall and shall be well bonded to the pipe. Aboveground copper piping through outside brick or concrete walls shall be emmsed in a plastic sleeve for mechanical

~ rotection and sealed at the casing and outside wall." UBSTANTIATION: Wrap on aboveground piping through wood

may become disbonded and trap moisture which greatly accelerates the corrosion rate. Our experience has shown bare pipe through wood performs much better than wrapped pipe when aboveground. Coating and wrapping copper pipe aboveground is not necessary. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The proposed text is excessively restrictive. The Committee recognizes that poorly coated pipe may trap moisture and accelerate corrosion, but believes that proper coating is preferable to no coating.

( Log #143) 54- 49 - (3.2): Accept in Principle SUBMITTER: James A. Clark, National Fuel Gas RECOMMENDATION: Revise text as follows:

3.2 Aboveground Piping Outside. Piping installed aboveground shall be securely supported and located where it will be protected from physical damage (also see 3.1.4)~ Where passing through an outside wall, the piping shall also be protected against corrosion by coating or wrapping with an inert material designed for such applications. Where piping is encased in a protective pipe sleeve, the annular space between the gas piping and the sleeve shall be sealed at the wall to prevent the entry of water, insects, or rodents. SUBSTANTIATION: Electrical tape is an inert material but if used for protecting bare steel pipe, will disbond in a short period of time exposing the bare steel to the elements the tape was intended to protect the steel pipe from. COMMITI'EE ACTION: Accept in Principle. Accept proposal and substitute "designed with "approved" "...approved for such applications."

COMMITTEE STATEMENT: The proposal is accepted with an editorial revision.

(Log #17) 54- 50 - (3.3.4): Accept in Principle Note: This proposal appeared as comment 54-96 which was held for

further study from the Annual 92 TCD, which was on proposal 54-32. SUBMITTER: Franklin M. Cloud, Atlanta Gas Light Co RECOMMENDATION: Revise text as follows:

Gas piping shall be oermitted to be installed in accessible above ceiling nlenum snaces. Gas oinin~ shall be oermitted to be installed in inaccessible afiove ceiling'non-_Dlenum s oaces. Valves shall not be located in such spaces.

(Underlined text added, proposed wording). SUBSTANTIATION: Tim proposed text will clarify that non- plenum inaccessible above ceiling locations for concealed piping are permissible. This additional coverage is needed to prevent the mterpretation by Code officials that all above ceiling gas piping shall be in accessible locations, and not treated as partition installations. COMMrITEE ACTION: Accept in Principle. Revise 3.3.4 to read: 3.3.4 Above-Ceiling Locations. Gas piping shall be permitted to be

installed in accessible above-ceiling spaces, whether or not such spaces are used as a plenum. Valves shall not be located in such spaces. COMMITrEE STATEMENT: The Committee believes that the change accomplishes the intent of the proposal.

SUBSTANTIATION: Why aren't valves allowed in accessible, ventilated above ceiling spaces? Take for example a horizontal furnace installed above a drop ceiling space. According to section 5.5.4, a valve is to be installed within 6 ft of the equipment, but section 3.3.4 doesn't allow a valve in an above ceiling space. Seems contradictory. Avalve should be allowed to be installed in an accessible, ventilated above ceiling space. COMMITTEE ACTION: Accept in Principle. Accept proposal as revised: Exception: ~ shutoffvalves required by the Code shall be

permitted to be installed in a.c.f._.~A.h~ above-ceiling spaces containing vented gas utilization equipment. COMMrVrEE STATEMENT: The Committee accepts proposal with above revisions.

(Log #207) 54-52 - (3.3.4): Accept in Principle SUBMITrER: James A~ Ranfone, American Gas Association RECOMMENDATION: Revise Section 3.3.4 as follows:

3.3.4 Above-Ceiling Locations. Gas piping shall be permitted to be installed in accessible above ceiling spaces, whether or not such spaces are used as a plenum. Valves shall not be located in such spaces.

Exceotion: Shutoffvalves located in attic snaces. SUBSTANTIATION: To permit the installa~tion ofshutoffvalves in attic spaces. Section 3.3.4 prohibits all valves from above ceiling locations which can be interpreted to included attic spaces. Under this interpretation, gas-fired equipment, such as water heaters and horizontal furnaces, could not be installed in attic spaces since shutoffvalves, required to be within 6 feet bysection 5.5.4, are PcrOhibited:

OMMITTEE ACTION: Accept in Principle. COMMITFEE STATEMENT: Refer to Committee Action on Proposal 54-51 (Log #117).

(Log #19) 54-53- (3.3.5 Exception (New)): Accept in Principle Note: This proposal appeared as comment 54-97 which was held for

further study from the Annual 92 TCD, which was on proposal 54-32. SUBMITTER: John H. Frantz, Philadelphia Electric Co. RECOMMENDATION: Add new text as follows:

"The provision prohibits valves in above-ceiling locations however, the intent of flais prohibition should not include ~as utilization equipment that may be installed in this location tlrat require a manual shutoffvalve. Therefore, we would llke to recommend an exception be made part of this provision."

Our proposed wording is: "Exception: Gas utilization equipment installed in above-ceiling

locations shall be provided with a manual shutoffwalve." SUBSTANTIATION: None. COMMIq[TEE ACTION: Accept in Principle. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-52 (Log #207).

(Log #18) 54- 54-(3.3.5(a), (b), (c) (New)): Reject Note: This proposal appeared as comment 54-98 which was held for

further study from the Annual 92 TCD, which was on proposal 54-32. SLIBMITTER: JamesJ. Glanville, Denver Bldg. Inspection Dept RECOMMENDATION: Include the following prohibited locations:

(a) stairway enclosures (b) above exit corridors (c) ceiling return air plenums.

SUBSTANTIATION: In case of leaks or fires, gas piping in these locations can be very hazardous to occupants. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The submitter provide no substantiation of the hazard.

(Log #117) 54- 51 - (3.3.4): Accept in Principle SUBMITTERx Russe/Iwan, Metropolitan Utilities District RECOMMENDATION: DELETE: 3.3.4 Above Ceiling Locations. Valves shall not be located in such spaces.

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(Log #20) 54- 55 - (3.3.6): Reject Note: This proposal appeared as comment 54-99 which was held for

fur ther study from the Annual 92 TCD, which was on proposal 54-32. SUBMITTER: FrankJ. Poskoci[, Nor thern IL Gas Co. RECOMMENDATION: Revise text as follows:

"Gas piping should not be allowed inside ducts supplying combustion and ventilation air to a "confined space." This is potentially more hazardous than pipe inside warm air supply ducts (prohibited by dais code)." SUBSTANTIATION: Gas leaked into supply ducts is diluted by high air flows and then distributed into large roonxs; occupants may detect gas odor before the gas concentrat ion increases to hazardous levels. A gas leak in ducts supplying ventilation air to a confined room has relatively lower air flow and usually has no occupants to detect gas odors. COMMITTEE ACTION: Reject° COMMITTEE STATEMENT: The Panel does not agree that locating gas piping in a duct supplying air to a confined space presents a greater hazard than gas piping in the confined space.

(Log #21) 54-56- (3.4.1): Reject Note: This proposal appeared as comment 54-101 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-32. SUBMITTER: James.[. Glanville, Denver Bldg. Inspection Dept. RECOMMENDATION: Add the following to dae first sentence:

"... with the exception of valves, unions, bushings, and plugged or aUP~sed openings, Threaded joints must be accessible."

TANTIATION: Source of may gas leaks may be detected but only if not concealed. COMMITrEE ACTION: Reject. COMMITI'EE STATEMENT: The subject is adequately covered in 3.4.2. No substantiation is provided to prohibit concealed threaded joints.

(Log #23) 54- 59 - (3.6): Reject Note: This proposal appeared as comment 54-1 l l which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-32. SUBMITTER: Dale Watterson, Madison Gas & Electric RECOMMENDATION: Revise text as follows:

..., or field bends provided the pipe is not damaged and ti~e internal diameter of the nine is not effectively reduced." SUBSTANTIATION: Fielc] bending can dan]age any pipe. Change makes 3.6 consistent with 3.6.2. COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: The Committee believes daat ti~e provisions of 3.6.1 provide sufficient precautions for proper pipe bending.

(Log #24) 54- 60 - (3.6.2(a)): Reject Note: Tiffs proposal appeared as comment 54-112 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-32. SUBMITTER: John H. Frantz, Philadelphia Electric Co. RECOMMENDATION: Revise text to include language requiring bends made to plastic pipe be made in accordance with manufacturers bending radius requirements.

Proposed text to read as follows: (a) Plastic pipe mayshall be permitted to be bent provided that

the pipe is not damaged and the internal diameter of the pipe is not effectively reduced. All bends shall be made in accordance with the manufacturers bending radius requirements. SUBSTANTIATION: With the increased use ofplastic pipe for gas, more definitive information is needed in the Code° COMMITI"EE ACTION: Reject. COMMITTEE STATEMENT: This is covered in 3.6.2(d).

(Log #185) 54-57- (3.4.2 and 1.7): Reject SUBMITTER: Harold Deskins, Ziegler Plumbing Co. RECOMMENDATION: 3.4.2 Delete unions from paragraph or 1.7 Definitions - Goncealed Gas Piping - Expand interpretation to gas piping which is enclosed in walls, ceilings, chases, etc. where access wouldrequi re destructive removal of pe rmanen t f inishes/framing by such methods as sawing, drilling, chipping,jack hammering, removal of fasteners, such as screws, nails, rivets, adhesives etc. SUBSTANTIATION: Expense and problems encountered in increasing branch line size by replacing tee in main line (especially in middle of long strip center) a n d / o r replacing defective fi tdng in main line. COMMI'I*rEE ACTION: Reject. COMM1TI'EE STATEMENT: The use of unions for repairs is permitted in 3.4.6.

(Log #22) 54-58- (3.4.5 Exception): Reject Note: This proposal appeared as comment 54-108 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-32. SUBMITTER: Jeffrey D. Hilleary, Denver Bldg. Dept. Engineering RECOMMENDATION: The Exception should be eliminated. SUBSTANTIATION: Allowing gas piping in a slab should not be the determinat ion of the authority having jurisdiction it should be prohibited entirely due to the hazards of gas pocketing, creating the potential for explosion, severe structural damage and possible loss of life. COMMITI'EE ACTION: Reject. COMMITrEE STATEMENT: The Committee believes that the restrictions in the exception are sufficient for safe installations.

(Log #25) 54- 61 - (3.13.6(a) Note 2): Accept Note: This proposal appeared as comment 54-118 which was held

for fur ther study from the Annual 92 TCD, which was on proposal N / ~ $UBMITI'ER: William S. Bigelow, Bigelow Associates

I RECOMMENDATION: Replace "practicable" with "practical." SUBSTANTIATION: The editorial advisory panel has proposed changing "practicable" to "practical" and this should be followed throughout the code in order to make the code more informative, usable and enforceable. COMMITI'EE ACTION: Accept.

(Log #111) 54- 62- (3.14): Reject SUBMITTER: Robert S. Blackwell, Independen t Gas Company RECOMMENDATION: Revise 3.14 to relax grounding a n d bonding requirements and add isolation from buried pipe. Revise:

E,~cZ~c Cc,~c, ,~4~le N,TP?,, 0. Abovecrround ~as nioin~ svstems shall be ~rounded. Groundin~ throu~h any ot~e o'r ~nor'e gas anolianc'es which is crrounded'fn accoFdance with the National E'lectric Code. ANSQNFPA 70 shall be considered adeouate. Metallic nine and tubin~ Joints shall be considered ade~auate to electrically'connect a Ta~piping system together.

(b) Gas piping shall not be used as a grounding electrode. (c) Under~round ferrous was ninin~ shall be electrically isolated

f rom the rest of the ~as Dini~n~ ~vstern e rounded in accordance with 3.14 (aL Isolation shall be accomolished with listed isolation fitdn~s installed a minimum of six (6) in. 'above made.

Excention 1: The buried portion of nora-gas-carrying casing matefi'al used in risers for olastic pipe and tubilng need Oot be electrically isolated.

Exceotio'n 2: Electrical isolation shall be optional for engilaeered cathol]callv orotected systems installed in accordance with the recommer~da.tions of tl4e National Association of Corrosion Engineers.

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SUBSTANTIATION: Problem summary. There are four issues here, (1) gas pipe should no t be part of a grounding network, (2) grounding indoor pipe connected to buried pipe makes the buried pipe an electrode, (3) the word "bonding" is ambiguous, and (4) corrosion.

1. Groundin~ network. Grounding gas piping to existing ANSI/ NFPA 70 grounds means that the gas piping is included in the grounding network of any system. Grounds are no t electrically dead. They have both voltage and carry current al though in small amounts. Including gas piping in a grounding network is not worth the perceived advantages. Current that leaks to any buried portion of a system will accelerate corrosion at any point exposed to soil.

2. Pipes as electrodes. The natural gas industry and DOT consider the unintentional use of a gas pipe as an electrode to be unsafe and have support ing accident statistics.

3. ~ The word "bonding" can imply to some that each jo in t should be bridged with a soldered, welded or brazed copper dgrounding strap, ff the word "bonding" is to remain, it should be

efined. 4. Gorrosion. Buried gas piping can be protected by electrically

isolating it f rom aboveground piping connected to copper-clad steel grounding rods, which are normally used by electricians. Copper and steel pipe in the same soil are dissimilar metals in electrolyte and cause the accelerated corrosion of the steel gas pipe. Without electrical isolation, every flaw in the buried portion of a gas piping system is a grounding electrode in contradiction of paragraph (b).

5. Exception No. 1. There is little reason to isolate buried steel that does not carry gas. Flexible casing material is covered with a very thick plastic. Hard casing material is generally protected by a thick coat of epoxy. If these coatings fail, no gas can escape because the gas-carrying plastic pipe or tubing remains intact.

6. ~ Where cathodic protection is used, electrical isolation may be necessary to prevent the imposed protective-current from draining off through the electrical system grounds.

7. Exception No. 2. Where engineered cathodic protection is used, the engineer may elect to use a very large anode or rectifier to protect all buried metal including electrical grounds. The engineer should be free to do that- It is common practice at gasoline stations to protect underground tanks, pipes, pumps, conduit, dispensers, etc., because it is impractical to isolate portions o f a systemparticu- larly after initial construction is complete. The same shou ldbe allowed for fuel gas systems.

8. UBC. This I~roposal would make NFPA 54 more like the Uniform Plumbing Code, which requires isolation but not grounding.

9. ~ It would be helpful to tradesmen installing gas piping to be able to f ind the most of what they need to know in one PNFpamphlet rather than referring to many documents such as ANSI/

A 70. It should suffice that the electrician on the j o b g rounded the gas appliance in accordance with ANSI /NFPA 70. Gas t rademen are seldom qualified to read ANSI/NFPA 70.

10. NACE. NACE sub,;tantiating material is RP-0169-92, which applies to the protection of piping. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The proposed change to (a) could result in an ungrounded piping system it" the appliance were unplugged or removed. To the Committee 's knowledge, no listed isolation fittings are presently available.

The substantiation does not support the premise that a problem exists that is caused by the provisions of the National Fuel Gas Code.

I

(Log #209) 54- 64 - (4.1.1 (c)): Accept in Principle SUBMITTER: James A. Ranfone, American Gas Association RECOMMENDATION: Revise Section 4.1.1 (c) as follows:

(c) In the event repairs or additions are made following the pressure test , the .~fected ~!p.!ng shall ̀ be tested, ,.xccvZ (,!)a~ !,, d~c

Exceotion: Minor reoairs or additions orovided the work is carefully inspected and connections are tested with a leak-detecting solution or other leak-detectin~ methods. SUBSTANTIATION: To claritY/the intent o f this section. The phrasing, "...shall be permit ted to be omitted...," is clumsy at best and confusing at worst. Since it is an exception that this part of the section is describing, it would be best to treat it as an exception. The phrase, precautionary measures," is wide open to interpretation. The NFPA 54 Handbook provides a clear unders tanding of what is acceptable practice to ensure gas-tight connections. Handbook language was used in developing the proposed exception. COMMITTEE ACTION: Accept in Principle.

Accept the proposal with the following revisions: Exception: Minor repairs or additions provided the work is

inspected and connections are tested with a non-corrosive leak- detecting ~ m~eiwrr or other leak-detecting methods bv the Authority Havina lurisdiction. COMMITTEE STATEI~2~IT: The Committee accepts proposal with the above editorial revision.

(Log#107) 54- 65 - (4.1.1 (d)) : Accept SUBMITTER: Milton W. Heath,Jr . , Health Consultants Inc. RECOMMENDATION: Revise Line 5 as follows:

"shall be tested with soap solution" to "... shall be tested with a noncorrosive leak detection fluid..." SUBSTANTIATION: Soap is quite corrosive particularly when left on the joint , fitting or pipe which is usually the case whether tested by LP gas personnel or the home owner. Corrosion leads to leaks and we have bulletins on CP protection now. This revision is being applied to all Safety Bulletins where such testing is r e commended and should be uniform in NFPA 54 and 58. COMMITrEE ACTION: Accept.

(Log #26) 54- 66 - (4.1.1(g)): Accept Note: This proposal appeared as comment 54-121 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTERa Dale Watterson, Madison Gas & Electric RECOMMENDATION: Revise text as follows:

"... shall be permit ted to be tested with inert gas t r a i t at time of fabrication." SUBSTANTIATION: In practice compressed air is often used as a test medium. COMMITTEE ACTION: Accept.

(Log #208) 54- 63 - (3.14): Accept SUBMITTER: James A. Ranfone, American Gas Association RECOMMENDATION: Revise Section 3.14 as follows:

3.14 Electrical Bonding and Grounding (b) Gas piping shall not be used as a grounding conductor or

electrode. SUBSTANTIATION: Some inspectors are permitt ing the bonding of metal enclosures/housings/frames, such as a factory built meta l fireplace housing, to the gas piping for the purpose of grounding. It is not the intent of NFPA 54 to permit the use of gas piping as a conductor for thispurpose. NFPA 70, National Electrical Code, in Article 250-Grounding, does not address dais issue. COMMITTEE ACTION: Accept.

(Log #29) 54- 67- (4.1.2): Reject Note; This proposal appeared as comment 54-126 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTER: Earle D. Stevenson, Citizens Gas & Code Utility RECOMMENDATION: Revise text as follows:

"The text medium shall be air, ni trogen or carbon dioxide. Oxygen or freon shall never be used.' SUBSTANTIATION: The use o f f reon as a test medium occurs at times because Heating and Cooling Contractors have it readily available. Because of the dangers involved when mixing Natural Gas and Freon, we feel this addit ion is justified. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Freon is currently not permit ted as it is not air, ni t rogen or carbon dioxide. The banning of Freon by the EPA makes the proposed change moot.

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(Log #27) 54- 68 - (4.1.2 Exception): Reject Note: This proposal appeared as comment 54-123 which was held

for further study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTER: Dale Watterson, Madison Gas & Electric RECOMMENDATION: Revise text as follows: "Exception: Fuel ... at pressures of 1/2 2 pound ..."

SUBSTANTIATION: Twopound systems are becoming much more common. The smaller sized2 pound systems are unlikely to present any more risk than a larger size system 1/2 pound or less. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The provision applies to the pressure test, and not the leak check. The Committee notes that a 2 psi system must be pressure tested at a minimum of 3 psi.

(Log #28) 54- 69 - (4.1.2 Exception): Reject Note: This proposal appeared as comment 54-124 which was held

for further study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTER: William H. Gorman, Essex County Gas Co. RECOMMENDATION: Add a new sentence as follows:

"Use of fuel gas as a test medium must be approved by the authority having jurisdiction." SUBSTANTIATION: To prevent unqualified personnel from Pcerforming tests on piping.

OMMITrEE ACTION: Reject. COMMrrrEE STATEMENT: The proposed change will not accomplish the intent of the submitter as provided in the substantiation.

(Log #CP39) 54- 70- (4.1.2 Exception): Accept SUBMII~I'ER: National Fuel Gas Code Committee RECOMMENDATION: Add atend of"Exception" the words, "or less." SUBSTANTIATION: To clarify the Code. COMMITrEE ACTION: Accept

(Log #30) 54- 71 - (4.1.3(a)): Accept Note: This proposal appeared as comment 54-129 which was held

for further study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTER: Enno Toomsalu, Underwriters Laboratories Inc. RECOMMENDATION: The second sentence should be included as an exception. SUBSTANTIATION: The second sentence states an exception to the requirement in the first sentence. As written, there is a conflict between the first and second sentences. COMMITTEE ACTION: Accept.

(Log#31) 54- 72- (4.1.3(c) through (e)): Acaept Note: This proposal appeared as comment 54-130 which was held

for further study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTER: Melvin W. Schroeder, M. W. Schroeder Corp. RECOMMENDATION: Add the phrases as noted below:

"(c) AnDliances and equipment which is are not to be..." "(d) M'~en the piping system is connected to appliances, equip-

ment or equipment components designed ... test pressure, such appliances, equipment or equipment components..." "(e) When the piping system is connectedto appliances, equipment or equipment components designed ... test pressure, such aonliance and equipment shall be isolated..." SUBSTANTIATION: The word "appliance" should be included because it is more readily understood by the average service person. Reinforces the intent of the Rationale. COMMITTEE ACTION: Accept.

(Log #CP44) 54- 73 - (4.1.4(c)): Accept SUBMITTER: National Fuel Gas Code Committee RECOMMENDATION: The Committee agreed to delete 4.1.4(c) since single-stage regulators are not permitted in NFPA 58~ SUBSTANTIATION: Single-stage regulators are no longer pcermitted in NFPA 58.

OMMITFEE ACTION: Accept.

(Log #32) 54- 74- (4.1.5(b)): Accept Note: This proposal appeared as comment 54-131 which was held

for further study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTER: Dale Watterson, Madison Gas & Electric RECOMMENDATION: Revise text as follows:

"b. The leakage ... approved combustible gas detector." SUBSTANTIATION: The word "combustible" limits new technology products. Requiring the gas detector to be "approved" insures safety. COMMITrEE ACTION: Accept. Delete "combustible" in 4.1 .5 (b).

(Log #33) 54- 75 - (4.1.5(b)): Accept in Principle Note: This proposal appeared as comment 54-132 which was held

for further study from the Annual 92 TCD, which was on proposal 54-51. SUBMITTER: Jeffrey D. Hilleary, Denver Bldg. Dept. Engineering RECOMMENDATION: Revise sentence in Caution to read:

"...solution is non corrosive and will not cause stress cracking." SUBSTANTIATION: Phrase about stress cracking should also be included in conditions regarding leak test solution. COMMITr£E ACTION: Accept in Principle. COMMITrEE STATEMF2qT: Refer to Committee Action on Proposals 54-77 (Log #133) and 54-76 (Log #134).

(Log #134) 54- 76 - (4.1.5(b) Caution): Accept in Principle SUBMITTER= Richard C. Sekerchak, Dormont Manufacturing Company RECOMMENDATION: Delete "...unless it has been determined the leak test solution is noncorrosive".

Replace with "...and wiped dry after rinsing". SUBSTANTIATION: Without through rinsing ~ there is no guarantee that the leak test solution has been adequately removed (including residues mixed in the rinsing water). COMMITrEE ACTION: Accept in Principle. Delete paragraph 2 of 4.1.5(a) beginning "Caution".

COMMITTEE STATEMENT: The intent of the proposal is accepted.

(Log #133) 54- 77 - (4.1.5(c)): Accept in Principle SUBMITTER: Richard C. Sekerchak, Dormont Manufacturing Company RECOMMENDATION: (c) Leak test solutions which are corrosive or reactive with the materials of the product or system being tested sh~l not be used. SUBSTANTIATION: Certain leak test solutions, readily available from plumbingsuppliers contain harmful chemical compounds (such as zinc chloride) which can quickly attack the metallic components of a gas system component resulting in leakage. COMMITrEE ACTION: Accept in Principle. The Committee accepts the proposal with the following revision: (b) The leakage shall be located bymeans of an approved

combustible gas detector, a non-corrosive leak detection fluid, or other aDnroved leak detection methods. Matches, candles, open flames, o r other methods that could provide a source of ignition shall not be used. COMMITTEE STATEMENT: The Committee accepts the proposal with the above revision which allows additional methods approved by the Authority Having Jurisdiction.

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N F P A 54 - - A 9 6 R O P

(Log #118) 54- 78- (4.1.6): Reject SUBMITYER: Russel lwan, Metropolitan Utilities District RECOMMENDATION: DELETE: Test Records. Records shall he made of inspection and all tests performed. These records shall indicate which portions of the piping system conform to this code or were pressure tested. SUBSTANTIATION: Existing language in the code is ambiguous. Who should keep records of such tests if they are done? How long should records be kept? COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Committee believes that recordkeeping is important. The records should be kept by the tester or as specified under local ordinance.

(Log #187) 54- 79 - (4.2.2 Note (New)): Reject SUBMITTER: BruceJ. Swiecicki, National Propane Gas Association RECOMMENDATION: Add a note to 4.2.2 of NFPA 54, National Fuel Gas Code (indicated b y e . )

4.2.2 Test for Leakage. Immediately after turning on the gas, the piping system shall be tested to ascertain that no gas is escaping.

ff leakage is indicated, the gas supply shall be shut off until th-e necessary repairs have been made.

Note: See 1.4 for nersonnel reauirements. SUBSTANTIATION: This proposal intends to address accidents caused by consumers and other non-qualified persons who disconnect gas appliances when moving or for other reasons and leave uncapped gas lines. Others may turn on the gas without realizing gas lines are uncapped, leading to the possibility for explosions to occur. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: The Committee does not believe that it is necessary to reference 1.4 as it is always applicable.

(Log #99) 54- 80 - (4.3.2): Accept SUBMITTER: William S. Bigelow, Maplewood, NJ RECOMMENDATION: Change the text to read as follows:

4.3.2 Placing in Operation. When piping full of air is placed in operation, the air in the piping shallbe displaced with fuel gas, provided the piping does not exceed the length shown in Table IV. The air can be safely displaced with fuel gas provided that a moderately rapid and continuous flow of fuel gas is in~oduced at one end of the line and air is vented out at the other end. The fuel gas flow should be continued without interruption until the vented gas is free of air. The point of discharge shall not be left unattended during purging. The vent shall then be closed.

ff the piping is 3 l,,cLc~ G; ',--. ~c, exceeds the lengths shown in Table ~ . the air in the piping s'hall be displaced vn~th an inert gas, and the inert gas shall then be displaced with fuel gas. SUBSTANTIATION: To make the second paragraph meet the provisions of the first paragraph of this section. The existing wording of the second paragraph is totally in conflict with the requirements of the first paragraph. COMMITTEE ACTION: Accept

(Log #100) 54- 81 - (5.1.6): Accept SUBMITrER: William S. Bigelow, Maplewood, NJ RECOMMENDATION: Change the text to read as follows:

"When corrosive or flammable process fumes ~ are present,... Such fumes ~ include..." SUBSTANTIATION: Inasmuch as the intent of the subsection is to deal with both fumes m~d gases, and some of the cited compounds are gases, for clarity, and to make the Code more usable, informative and enforceable, the wording should be changed. COMMITTEE ACTION: Accept

(Log #34) 54- 82- (5.3.3): Reject Note: This proposal appeared as comment 54-151 which was held

for further study from the Annual 92 TCD, which was on proposal 54-65. SUBMITTER: JamesJ. Gtanville, Denver Bldg. Inspection Dept. RECOMMENDATION: This section should be deleted or qualified by defining where the combustion air from the adjoining space is coming from. If the adjoining space is a tightly conslxucted,

occupied space (maybe even a sleeping area), removal of air from this space can be very dangerous. Also, any gas leaks in the equipment room may infiltrate to the occupied adjoining space through the upper ventilation opening. SUBSTANTIATION: None. COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: There is not adequate technical substantiation provided in the proposal.

(Log #176) 54- 83 - (5.3.3): Reject SUBMIIWER: Robert G. Meyers, Long Island Lighting Co. RECOMMENDATION: A new hard extensive and in-depth look should be made to Section 5.3 altogether. Perhaps a different approach based on flow and/or pressure differential between space and outdoors; perhaps a relationship to the vent draft. Should also be related to tightness of construction. SUBSTANTIATION: We have found that, upon converting to gas, a very large percentage of homes on Long Island prove to be confined spaces, even taking into account entire basements. The 50 cuft 1,000 Btuh rule appears to be very conservative. It is unclear how safe some of these homes have been while burning oil for the last 30 years. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: There is no specific proposal provided by the submitter.

(Log #195) 54- 84 - (5.3.3(b)): Accept in Principle SUBMITTER: Allen L. Rutz, Battelle RECOMMENDATION: Add the underlined text, as follows: 5.3.3(b) All Air From Outdoors. The confined space shall be

provided with two permanent openings, one commencing within 12 in. (30 cm) of the top, and one commencing within 12 in. (30 cm) of the bottom, of the enclosure.

Excention: In installations with clearances of at least I in. to the sides and back and 6 in. to the front of the annliance(s), a single combustion air onenin~ commencin~ within"12 in. of the ton of the enclosure and ha'vin~ a~minimum free area o f l sa in. her 3600 Btu/ hr of the total innut'ratin~ of all eouinment Iocat6d in'the enclosure. but no smaller thanthe vent flov¢ area shall be nermitted.

The opening (s) (shall communicate directly, or by'ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors. The minimum dimension of air opening .(i). shall be not less than 3 in. (8 cm). SUBSTANTIATION: The single opening has been shown to operate as well as two openings t the outdoors. Use of the single opening is expected to decrease the potential for freezing water pipes in the appliance room and may reduce the incidence of homeowners blocking the combustion air opening. The technical background for this revision is contained in the Gas

Research Institute report GRI-93/0316 "Analysis of Combustion Air aOdPdening s to the Outdoors Preliminary results". Parenthesis are

ed to the pluralizing of the term "opening" to generalize the specifications to one or two openings to the outdoors. COMMrITEE ACTION: Accept in Principle. Revise 5.3.3(b) as follows: (b) All Air From Outdoors. The confined space shall communi-

cate with the outdoors in accordance with methods 1 or 2. The minimum dimension of air openings shall not be less than 3 in. (8 cm). Where ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect

1. Two permanent openings, one commencing within 12 in. (30 cm) of the top, and one commencing within 12 in. (30 cm) of the bottom, of the enclosure shall be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors. The confined space shall communicate with the outdoors in accordance with methos 1 or 2. The minimum dimension of air openings shall not be less than 3 in. (8 cm). Where ducts are used, they shall be of the same cross-sectional area as the free are of the openings to which they connect.

a. Where directly communicating with the outdoors or where communicating to the outdoors through vertical ducts, each opening shall have a minimum free area of 1 sq in. per 4,000 Btu per hr (5.5 cm2 per kw) of total input rating of all equipment in the enclosure. (See Figure 3.)

b. Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq in. per 2,000 Btu per hr (11 cm2 per kw) of total input rating of all equipment in the enclosure. (See Figure 4).

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N F P A 5 4 - - A 9 6 R O P

2. O n e p e r m a n e n t opening, c o m m e n c i n g within 12 in. (30 cm) of the top of the enclosure shall he permi t ted where the equ ipmen t has clearances of at least 1 in. f rom the side and back and 6 in. f rom the f ront of the appliance. The open ing shall direcdy communica te with the outdoors or shall communica te t h rough a vertical or horizontal duc t to the outdoors or spaces (crawl or attic) that freely communica tes with the outdoors, and shall have a m i n i m u m free area of:

a. 1 sq in. per 3,000 Btu per h r o f the total inpu t radng of all equ ipmen t located in the enclosure, and

b. Not less than the sum of the areas of all vent connectors in the conf ined space. COMMITYEE STATEMENT: The proposal is accepted with editorial revisions.

(Log #210) 54- 85 - (5.3.3(b)): Accept in Principle SUBMITTER: James A. Ranfone, American Gas Association RECOMMENDATION: Revise Section 5.3.3(b) as follows:

(b) All Air f rom Outdoors . For an aonl iance with a m i n i m u m clearance o f 1 in. (2.5 cm~ on the side's l ind back and 6 in. (15,2 cm~ on the f ront the conf ined space shall be provided with ~ one p e r m a n e n t openings, ~rre c o m m e n c i n g within 12 in. (30 cm) of the top, ~a~l' . . . . . . . . . . . . . . . . 1,,~ ,,;;.l,;,, 12 h,. (3C . . . . ) ~,~ Zl,~ :.~,~;.~,,, of the enclosure. The openings shall communica t e directly, or b y a duct~, with the outdoors or space ( e r n w ~ r attic) tha t freely communica t e with the outdoors. T he m i n i m u m d imens ion of air openings shall be no t less than 3 in. (8 cm). Annliances with less than the m i n i m u m clearance of 1 in. (2.5 cm~ b~a the sides a n d hack and 6 in. (15.2 cm~ on the f ront shall be sunnl ied outside combus- t ion air in accordance with the manufac tu re r ' s installation instruc- t ions.

1. Where directly commun i ca t i ng with the outdoors, ~ t h e openings or duc t shall have a m i n i m u m free area of 1 sq in. per

~ Btu per h r (~.r~ 4.1 cmZ per kw) of total inpu t rat ing of all e q u i p m e n t in the enclosure bug no smaller than the veot flow area. (See Figures 2 and 3.)

~,~y . . . . v . ~. *:. w . ~ ;-... v - ;2 - . , ~ ~ - "~*'%'*'v . . . . . . . s . . . . . ~]~'17.'" ........ , .... ?'X ~. .... ~Z~'.." "~'%~'~ .........

<~,ooo ~.~,+ v-+ , ~:. ,.. ,;.. ,- v,-. -~., ~.u. ,+ ~.W" ,.,v.,~ ,,+*,..g . . * - 1

4. 2. Where a duct~'na'e is used, ~ y it shall be o f the same cross sectional area as the free area of the openings to which ~ ir is connected.

Delete existing Figure 2

Chimm~¢ ot Gel Veal

Ventilation I_ouvtrl _ (etch end of e l t i e l

f . . . . k_____

~ ; ~ , e d,,eT

, , . . . . . , . . . . . , , , , f Oelere

!lV-q "T . . . . . . . ' I^lctfl..t.t/t;~- 11 I I I I

' aq Ogtak~ "¢ i l ~ l k V ~ t l ~ t ~ A u k . S ~ S J . ~ L

Figure 2. Equipment located in conf 'med spaces; all air from outdoors th rough ventilated attic. See 5.3.3(b).

. J .

~ U I / d r ~ O a l d o ~ 5 ~ S J . l ~ o l .

OIAJ ¢ ' r

O eV -~OTovv-x

F'tgure 3. Equipment located in conf'med spaces; all air from outdoors. See 5.g.3(b).

SUBSTANTIATION: To permi t one outside air open ing when combust ion and dilut ion air is taken directly f rom the outdoors. The code requi rements for appl iances relying on indoor air to mee t its combust ion air needs would still require two openings sized according to the existing code. These requi rements are based on Gas Research Institute research conduc ted by Battelle Columbus. They address the concerns associated with the in t roduct ion of freezing air t empera tures into a r o o m / e n c l o s u r e where gas appliances are located and where water pipes could be susceptible to freeze-ups. A copy of the Battel le-Columbus repor t will be provided to the commit tee . COMMITYEE ACTION: Accept in Principle. COMMITI~E STATEMENT: Refer to Commit tee Action on Proposal 5484 (Log #195).

(Log #35) 54- 86 - (5.3.5): Accept in Principle Note: This proposal appeared as c o m m e n t 54-162 which was held

for fu r ther study f rom the Annua l 92 TCD, which was on proposal 54-51. SUBMITTER: Jeffrey D. Hilleary, Denver Bldg. Dept. Engineer ing RECOMMENDATION: Revise last sen tence to read:

"... so tha t they are proven to be open dur ing e q u i p m e n t opera- t i o n . "

SUBSTANTIATION: Louvers mus t he proven to be open, not ju s t opened automatical ly- (l inkage could fail). COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: Refer to Commit tee Action on Proposal 54-88 (Log #211).

(Log #119) 54- 87 - (5.3.5): Accept in Principle SUBMITTER: Russel lwan, Metropol i tan Utilities District RECOMMENDATION: Revise last sen tence in 5.3.5 to read as follows:

"Louvers and Grilles. Manually operated dampers of manual ly adjustable louvers shall no t be installed in combust ion and ventila- t ion air openings. Louvers and grilles shall be fixed in the open posit ion of power-activated movable louvers may be used. Power- activated movable louvers shall e electrically interlocked with the main bu rne r fuel-supply valve so as to prevent fuel delivery, unless the louvers are in the fully open position." SUBSTANTIATION: I believe a better explanat ion of interlocking louvers to gas e q u i p m e n t is necessary. What h a p p e n s if the linkage that opens the louvers fails, bu t the e q u i p m e n t still fires? I believe wording similar to the un i form mechanica l code would help clarify the code.

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N F P A 54 ~ A 9 6 R O P

COMMITI'EE ACTION: Accept in Principle. COMMITI'EE STATEMENT: Refer to Committee Action on Proposal 54-88 (Log #211).

SUBSTANTIATION: Clarify requirement. COMMITFEE ACTION: Reject. COMMITI'EE STATEMENT: There is no technical substantiation in the proposal.

(Log#211) 54- 88 - (5.3.5): Accept SUBMITTER: James /L Ranfone, American Gas Association RECOMMENDATION: Revise Section 5.3.5 as follows:

5.3.5 Louvers and Grills. In calculating free area in 5.3.3, consideration shall be given to the blocking effect of louvers, grilles, or screens protecting openings. Screens used shall not be smaller than 1/4-in. (6.3-ram) mesh. If the free area through a design of louver or grille is known, it shall be used in calculating the size opening required to provide the free area specified, f f t he design and free area are not known, it shall be assumed that wood louvers will have 20-25 percent f lee area and metal louvers and grilles will have 60-75 percent free area. Louvers and grilles hall be fixed in the

• : , , . .?., ,:. . . . . . open position . . . . . t~,l . . . . . . . . . . . . . , t ~ , v . , . ~ t . . . . . . . . . z ~

Exccntior~; Louvers interlocked with the eauinment so that they are oo'en durin~ main burner oneration. Provision shall be nrovided to prevent the main burner frOth ignitin~ should the louver fall to

sg-~STANTIATION: The proposed change to an exception format would eliminate the word "or" which matay building code officials consider permissive language. The exception would add a requirement for a proof that the louver is in the opened position, ensuring adequate combustion air is available, before main burners are ignited. The existing coverage does not explicitly include this important safe guard. COMMITTEE ACTION: Accept.

(Log #36) 54- 89 - (5.4.2(b)): Accept Note: This proposal appeared as comment 54-163 which was held

for fur ther study from the Annual 92 TCD, which was on proposal N/A. SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Modify 5.4.2(b) by the addition of an exception to read as follows:

(b) Equipment shall be installed on a well-drained surface of the roof. At least 6 ft clearance shall be available between any part of the equipment and the edge of a roof or similar hazard, or rigidly fLxed rails o rguards at least 42 in. in height shall be provided on the exposedside.

Exception: Parapets or other building structures at least 42 in. in height shall be permit ted to be utilized in lieu of rails or guards. SUBSTANTIATION: The wording of the current text is clearly an exception to the rule and should be noted as such in order to make the code more informative, usable and enforceable. COMMrlTEE ACTION: Accept.

(Log #135) 54-92- (5.5.1(c)): Reject SUBMIq[q'ER: Richard C. Sekerchak, Dormont Manufacturing Company RECOMMENDATION: Revise text as follows:

(c) Listed connectors complying with ANSI Z21.24, Metal Connectors for Gas Appliances, for stationary appliances that are completely in the same room as the equipment. SUBSTANTIATION: Eliminate field inspector confusion on interpretation of the word "listed". COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: The Committee agrees that the terms of a connector 's listing will de termine its p roper usage.

(Log#131) 54- 93 - (5.5.1 (g)): Reject SUBMITTER: Richard C. Sekerchak, Dormont Manufacturing Company RECOMMENDATION: Add new text as follows:

(g) Gas-fired food service (commercial cooking) equipment with casters utiUzing gas hose connectors in compliance with 5.5.1 (e) shall be installed with a movement limiting device to prevent strain on the gas hose connector per the requirements of ANSI Z21.69 Connectors for Movable Gas Appliances. SUBSTANTIATION: Restate requirement for movement limiting device as presently indicated in 6.12.6 to clarify and stress requirement for field inspector~ when referring to requirements for gas hose connectors. COMMrITEE ACTION: Reject. COMMITTEE STATEMENT: Current Code coverage in 5.5.1 (e) and 6.12.6 is adequate.

(Log #37) 54- 94- (5.5.2(a)): Reject Note: This proposal appeared as comment 54-165 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-74. SUBMITFER: Arthur H. Kuhnz, Wisconsin Public Service Corp. RECOMMENDATION: In the third add "or a listed quick disconnect device" after "a shut off valve".

Same statement as "b". SUBSTANTIATION: To be consistent. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-95 (Log #101).

(Log #120) 54- 90- (5.4.3(b)): Accept in Part SUBMITTER: Russel lwan, Metropolitan Utilities District RECOMMENDATION: Add to 5.4.3: Access to Equipment on Roofs.

(b) Multi-story buildings or single story buildings of more than 15 ft (4.6 m) in height shall have an inside means of access to the roof, unless other means are used acceptable to the authority having Jsurisdiction.

UBSTANTIATION: The 15 ft requi rement is ambiguous. More options are necessary to access equipment on roofs other than from inside the building. This revised rule will allow for some flexibility. COMMITTEE ACTION: Accept in Part.

Revise proposal by deleting the words: "Multi-story buildings or single story. ' COMMITTEE STATEMENT: Present terminology includes multi- and single- story buildings. The added phrase to "other means" provides clarity.

(Log #169) 54-91 - (5.5.1): Reject SUBMITTER: Paul A. Cama, Long Island Lighting Company RECOMMENDATION: Revise text as follows:

"Flexible piping connect ions shall not be used to permanently connect equipment. Such as to a water heater or space heaters."

(Log #101) 54- 95 - (5.5.2(a)): Reject SUBMITTER: William S. Bigelow, Maplewood, NJ RECOMMENDATION: Change the text to read as follows:

(a) Indoor. Indoor gas hose connectors shall be permit ted to be used with laboratory, shop, or ironing equipment that requires mobility during operation. An equipment shutoffvalve oondisola~;eable valve member or a listed auick disconnect device installed in accordance with 5.5.5 or a lis~e~l gas convenience outlet shall be installed where the connector is at tached to the building piping. The connector shall be of minimum length and shall no t exceed 6 ft (1.9 m). The connector shall not be concealed and shall not extend from one room to another nor pass through wall

g artitions, ceilings, or floors. UBSTANTIATIrON: We can see no reason for this section to differ

from the remainder of the code with respect to the nature of a valve, as well as other permit ted device. The addition of the proposed wording will make the Code more uniform and make the code more usable, informative and enforceable. COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: There is not adequate technical substantiation in the proposal to support the use of gas convenience outlets or quick-disconnect devices with gas hoses.

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(Log #136) 54-96- (5.5.2(a)): Reject SUBMITTER: Richard C. Sekerchak, Dormont Manufacturing Company RECOMMENDATION: Revise text as follows:

"(a) Indoor. Indoor gas hose connectors complying with ANSI Z21.69, Connectors for Movable Gas Appliances, shall...." SUBSTANTIATION: Clarify requirements for equipment installations that requires mobility for indoor service. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Z21.69 connector s tandard does not cover indoor gas hose.

(Log #102) 54-97- (5.5.2(b)): Reject SUBMITTER: William S. Bigelow, Maplewood, NJ RECOMMENDATION: Change the text to read as follows:

(b) Outdoor. Outdoor gas hose connectors shall be permit ted too be used to connect portable outdoor gas-fired equipment . An equipment shutoff valve with a nondisplaceable valve member or a listed quick-disconnect device or a listed gas convenience outlet shall be installed where the connector is at tached to the supply piping and in such a manner to prevent the accumulation of water or other foreign matter. This connect ion shall only be made in the outdoor area where the equipment is to be used. SUBSTANTIATION: The use of such a valve will ensure that there will be no gas leakage at the equipment shutoffvalve. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The requi rement for a nondisplaceable valve member is currently required under 5.5.4 of the Code.

SUBSTANTIATION: The National Fuel Gas Code states that the minimum clearance for single-wall connectors shall be 6 in. f rom combustibles. We now have several new U.L. listed vent connectors on the market which have been tested and listed to 1 in. clearance to combustibles, providing the connectors are installed in accordance with the terms of their listings.

This recommendat ion was presented to the NFGC venting committee at the April 23-24 meeting. The proposal was made

jointly by the GAMA Gas Vent Division, U.L., and NFPA 211 Committee. The NFGC Venting Committee voted to accept the proposal. The proposed revision has been inadvertently omitted from the August 1991 proposed copy. Please amend accordingly. COMMITTEE ACTION: Accept in Principle. Add a new Note 11 to Table VI to read: "Listed single-wall connectors shall be permit ted to be installed in

accordance with the terms of their listing and the manufacturer 's instructions." COMMITTEE STATEMENT: A reference to manufacturer 's instructions has been added as the Committee believes this is needed for proper installation.

(Log #39) 54- 101 - (6.1 (a)): Reject Note: This proposal appeared as comment 54-175 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: JamesJ . Glanville, Denver Bldg. Inspection Dept. RECOMMENDATION: Delete "... unless the bedroom or bathroom is an unconf ined space." SUBSTANTIATION: "Unconfined space" is not defined. This permits a very hazardous situation. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: "Space, Unconfined" is def ined in the code under 1.7, Definitions.

(Log #132) 54-98- (5.5.2(b)): Reject SUBMITTER: Richard C. Sekerchak, Dormont Manufacturing Company RECOMMENDATION: Revise text as follows:

"(b) Outdoor. Outdoor gas hose connectors complying with AGA 3-87, AGA Requirement for Gas Connectors for Connect ion of Fixed Appliances for Outdoor Installation, Park Trailers, and Manufac- tured Homes to the Gas Supply, shall ..." SUBSTANTIATION: Clarify requirements for equipment installations that are located outdoors. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: AGA Requirement 3-87 does not cover outdoor gas hose for portable equipment.

(Log #40) 54-102- (6.1 (a)): Reject Note'. This proposal appeared as comment 54-176 which was held

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: Jeffa'ey D. I-Iilleary, Denver Bldg. Dept. Engineering RECOMMENDATION: Delete the word "only" f rom the sentence. SUBSTANTIATION: No combustion air should be taken from a bedroom or bathroom. (How much air could be taken from them if this wording remains? 10 percent - 50 percent - 99 percentS) COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Coverage is correct as written.

(Log #38) 54-99- (Part 6 ): Reject Note: This proposal appeared as comment 54-172 whicb was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: JamesJ . Glanville, Denver Bldg. Inspection Dept. RECOMMENDATION: Delete this part in its entirety. This is not part o f a "Gas Code" and is adequately covered in other NFPA Standards and Codes. SUBSTANTIATION: This sec t ionprompts the question, "what does air p lenums and ductwork have to do with a gas code?" COMMITI'EE ACTION: Reject. COMMITTEE STATEMENT: The Committee agrees that coverage in Part 6 needs to be retained. The scope of the Code covers installation of gas utilization equipment .

(Log #43) 54- 100 - (Part 6, Table VI ): Accept in Principle Note: This proposal appeared as comment 54-183 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-81. SUBMITTER: JohnJackl ich, Simpson Dura-Vent RECOMMENDATION: Add footnote to table as follows:

Exception: Listed single-wall connectors may be installed in accordance witb the terms of its listing.

(Log #41) 54-103 - (6.2): Accept in Principle Note: This proposal appeared as comment 54-178 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-84. SUBMITTER: Tony Demases, Lone Star Gas Co. RECOMMENDATION: Revise text as follows:

PART 6 INSTALLATION OF SPECIFIC EQUIPMENT 6.2 Air Conditioners and Heat Pumps Condit ioning Equipment. 6.2.1 Independen t Gas Piping. Gas piping servicing heating gas

utilization equipment may also serve cooling equipment when heating and cooling equipment cannot be opera ted simultaneously. (See 2.4.) 6.2.2 Connection of Gas Engine-Powered Air conditions. To

protect against the effects nor normal vibration in service, gas engines shall not be rigidly connected to the gas supply piping.

6.2.3 Clearances for Indoor Installation. (a) Listed air conditions and heat pumps condit ioning equipment

installed in rooms which are large in comparison with the size of the equipment shall be installed with clearances no t less than those specified in Line 1 of Table V except as provided in "1," "2," and "3" below.

1. Air conditioners and heat numns conditioning equipment listed for installation at lesser clearances ~ a n those specified in Table V may be installed in accordance with its listing and the manufacturer 's instructions.

2. Air conditioners and heat pumps condit ioning equipment listed for installation at greater clearances than those specified in Table V shall be installed in accordance with its listing and the manufacturer 's instructions unless protected as specified in "3".

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N F P A 54 - - A 9 6 R O P

3. Air conditioners and heat Dumns condit ioning equipment installed in rooms large in comparis'on with the size of the equipment may be installed with reduced clearances to combustible mateda lprov ided the combustible material or the equipment is pro tec tedas described in Table Vl.

(b) Air conditioners and heat numns conditioning equipment installed in spaces such :as alcoves an~l closets shall be specifically listed for such installation and installed in accordance with the terms of its listing. The installation clearances for air conditioners and heat pumps conditioning equipment in rooms not large in comparison with the size of equipment shall be as specified in the listing, regardless of whether the enclosure is of combustible or noncombustible material, and shall not be reduced by the protection methods described in Table VI.

(c) Unlisted air conditioners and heat numns conditioning equipment shall be installed with cleasarlces from combustible material of not less than 18 inches above the equipment and at the sides, front, and rear, and 9 inches f rom the draft hood.

(d) When the plenum for a heat numn or an air condit ioner which includes provisions for heating air [s adjacent to combustible material, the clearance shall be measured to the surface of the plaster or other noncombust ible finish when the clearance specified is 2 inches or less.

(e) The clearance to this equipment shall not interfere with combustion air, draft hood clearance and relief, and accessibility for servicing. (See 5.2.1, 5.3, and 7.12.8)

6.2.4 Erection and Mounting. Air conditioners and heat DumPs condit ioning equipment shall be erected in accordance with the manufacturer 's instructions. Unless the equipment is listed for installation on a combustible surface such as a floor or roof, or unless the surface is protected in an approved manner , it shall be installed on a surface of noncombust ible construction with noncombust ible material and surface finish and with no combustible material against the umterside thereof.

6.2.5 Plenums and Air Ducts. A p lenum supplied as a part of the air conditioners of heat pumos conditioning equipment shall be installed in accordance with the manufacturer 's instructions. When a plenum is not supplied with the equipment, any fabrication and installation instructions provided by the manufacturer shall be followed. The me thod of connecting supply and return ducts shall facilitate proper circulation of air. (Reference may be made to the Standard for the Installation Of Air Condit ioning and Ventilating Systems, ANSI/NFPA 90A, or the Standard for the Installation of Warm Air Heating and Air Conditioning Systems, ANSI/NFPA 90B.)

Wilen the air conditioners and heat numns are is installed within a room not large in comparison with the size of the equipment, the air circulated by the equipment shall be handled by ducts which are sealed to the casing of the equipment and which separate the circulating air f rom the combustion and ventilation air. SUBSTANTIATION: The proposed editorial changes are intended to prevent confusion in air condit ioning terminology. They will correlate with a proposed Z21 Gas Air Conditioning Standard. COMMITrEE ACTION: Accept in Principle. Revise Title o f 6.2 to read "Air Condit ioning Equipment (Gas-Fired

Air Conditioners and Heat Pumps)." COMMITTEE STATEMENT: The Committee believes that revising the title of 6.2 to state (Gas-Fired Air Conditioners and Heat Pumps) satisfies the submitter 's proposal.

Appropriate definitions were added under Proposal 54-11 (Log #7).

(Log #103) 54- 104- (6.2.1): Reject SUBMITTER: William S. Bigelow, Maplewood, NJ RECOMMENDATION: Change the text to read as follows:

6.2.1 Independen t Gas Piping. The sizing of gas piping serving heating gas utilization equipment shall b e p e r m i t t e d to serve cooling equipment and the pipe shall be pe rmi t t ed to be sized based upon the largest input anoliance, orovidin~ onlv one appliance can be operated at a ' t ime-Qhc,c i ,~J , , t s ~ , ~ ,.,,.,~L~ts ~,t~,~t,.~,cut . . . . ,Abc u~,~,o.tc,l" ~h,,ul;~,c,,~',y. Otherwise, t~le pipe sizing shall be based upon the combined load. (See Section 2.4, Sizing of ~as piping ~_t_em~. ) SUBSTANTIATION: The intent of the section is to set guidelines for the sizing of gas piping. The proposed wording will clarify the intent of the section and make the code more usable, readable and enforceable. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: Sizing of gas piping is covered under Section 2.4 of the Code.

(Log #42) 54-105 - (6.2.3 Exception): Accept in Part Note: This proposal appeared as comment 54.181 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Remove the phrase "with its listing and" in Exception No. 2.

Remove the word "may" and replace it with "shall be permitted to" in Exception No. 3.

Remove the phrase '%vith the terms of its listing" and replace it with "with the manufacturer 's instructions" in b.

The revised sections should read as follows: Exception No. 1: Air condit ioning equipment listed for installation

at lesser clearances than those specified in Table V shall be permitted to be installed in accordance with the manufacturer 's instructions.

Exception No. 2: Air conditioning equipment listed for installation is greater clearances than those specified in Table V shall be installed in accordance with the manufacturer 's instructions unless protected as specified in "Exception No. 3".

Exception No. 3: Air conditioning equipment installed in rooms large in comparison with the size of the equipment shall be permit ted to be installed with reduced clearances to combustible mater ialprovided the combustible material or the equipment is protec tedas described in Table VI.

(b) Air condit ioning equipment installed in confined spaces such as alcoves and closets shall be specifically listed for such installation and installed in accordance with the manufacturer 's instructions. The installation clearances for air conditioning equipment in rooms not large in comparison with the size of the equipment shall be as specified in the listing, regardless of whether the enclosure is of combustible or noncombust ible material, and shall not be reduced by theAarotection methods described in Table Vl. SUBSTANTIATION: Editorially, "may" has been replaced with "shall be permitted to". Additionally, the Equipment Installation Advisory Panel 's recommendat ion that the phrase "terms of its listing" be removed is appropriate as that is covered in 6.1 (b). COMMI'ITEE ACTION: Accept in Part.

The Committee accepts the proposal but the revision to delete the words, "or the equipment" from Exception No. 3. COMMITI'EE STATEMENT: The Committee believes protection is needed for combustible materials not the equipment.

(Log #44) 54- 106- (6.3.1 (a) Exception No. 1): Reject Note: This proposal appeared as comment 54-184 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITI'ER: William S. Bigelow, Bigelow Associates R£COMMENDATION: Delete "their listing mad" from tile Exception so it reads as follows:

Exception No. I: Central heating furnaces and boilers listed for installation at lesser clearances than specified in Table V shall be permitted to be installed in accordance with the manufacturer 's instructions. SUBSTANTIATION: The Equipment Installation Advisory Panel 's recommendat ion that the phrase "terms of its listing" be removed is appropriate as that is covered in 6.1 (b). COMMITTEE ACTION: Reject. COMMITlrEE STATEMENT: Refer to Committee Action on Proposal 54-105 (Log #42).

(Log #45) 54- 107- (6.3.4): Reject Note: This proposal appeared as comment 54=185 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-86. SUBMITTER: Forrest R. Sprague, Providence Gas Co RECOMMENDATION: Revise text as follows:

"Hot water boilers and steam boilers shall be provided with an automatic means to shut off the fuel supply to the burner(s) if the boiler water level drops to the lowest safe water line." SUBSTANTIATION: The problem is with the hot water boiler installations. This section is designed to protect the boiler from operating with low water. The normal problem is that the water feed does not operate because of inactivity. A water leak occurs in a heating coil, circulator, gasket, etc., but there is no low water cut off on most installations.

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N F P A 54 - - A 9 6 R O P

NOTE: Supporting material is available for review at NFPA Headquarters. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Committee agrees that the Code covers the installation of a low water cutoff.

(Log #170) 54- 108- (6.3.5): Accept in Principle SUBMITTERa Paul A. Carna, Long Island Lighting Company RECOMMENDATION: Add:

1. Relief Valves shall be piped to discharge approximately 18 in. from the floor.

2. Discharge Piping shall be at least the same size of the relief valve discharge tapping.

3. Discharge Piping shall not contain threaded end connection at its termination point. SUBSTANTIATION: To provide a safe work area for service personnel. COMMITTEE ACTION: Accept in Principle.

Revise "1" to read, "Relief valves shall be piped to discharge near the floor."

Revise "2" to read, "The entire discharged piping shall be at least the same size of the relief valve discharge tapping." Acce t"3" as pro osed.

C O ~ T T E E ST~'~'EMENT: The committee accepts the proposal with the modifications.

(Log #46) 54- 109- (6.4.1 (a) Exception (New)) : Reject Note: This proposal appeared as comment 54-186 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79 SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Revise 6.4.1 a. to read as follows:

(a) Listed Type 1 clothes dryers shall be installed with a minimum clearance of 6 in. f rom adjacent combustible material. Type 1 clothes dryers installed in closets shall be specifically listed for such installation.

Exception: Listed Type 1 clothes dryers listed for installation at lesser clearances shall be permit ted to be installed in accordance with the manufacturer 's instructions. SUBSTANTIATION: Editorially, the second half of the first sentence in a. is an exception and should be treated as one. In addition, the Equipment Installation Advisory Panel 's recommendation that the phrase "terms of its listing" be removed is appropriate as that is covered in 6.1 (b). COMMITTEE ACTION: R~ect. COMMITTEE STATEMENT: Coverage is correct as written.

0

(Log #121) 54- 110- (6.4.2(a)): Reject SUBMITTER: Russel Iwan, Melxopolitan Utilities District RECOMMENDATION: DELETE: 6.4.2 Exhausting to the Outside Air.

"(a) ...and no other fuel-burning appliance shall be installed in the same closet." SUBSTANTIATION: The NFGC does not give a definition for a closet. I've talked with officials at NFPA, AGA, GRI, and no one has a definition for closet. New research is needed to determine how a closet is to be defined. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: There is incomplete technical substantiation for the proposal. Also, current coverage is consistent with coverage specified in the Z21.5.1 Type 1 gas-fired clothes dryer standard.

SUBSTANTIATION: CurrentiyANSI standards for clothes dryers (Z21.5.1 and Z21.5.2) require that dryers installed in a closet be exhausted to the outside. We are suggesting a stronger statement for the national code. This will help installers and codes officials use logic compatible with the product standards. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The proposed coverage is currently in conflict with 6.4.3(a) of the Code.

(Log #CP2) 54- 112 - (6.4.3(a) Note): Accept SUBMII~'ER: National Fuel Gas Gode Committee, RECOMMENDATION: Delete "NOTE: Where a Type 1 clothes dryer is exhausted to the outside, consideration shall be given to provision for make-up air." SUBSTANTIATION: The Committee agrees the "Note" is unenforceable. COMMITTEE ACTION: Accept.

(Log #48) 54-113 - (6.4.5): Reject Note: This proposal appeared as comment 54-189 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-82. SUBMITTER: LarryWrobel, Speed Queen Co. RECOMMENDATION: Add clarification for the thickness of the galvanized sheet steel used for dryer exhaust ducts as follows:

(0.0195 includes the galvanized coating thickness). SUBSTANTIATION: We feel this clarification is necessary to help codes officials interpret the requirement . We have had clients report to us that commercial laundry installations have been "red tagged" because the codes official measured the thickness of the exhaust duct but did not consider the thickness of the coating. That is, and 0.0195 in. thick material was disallowed because the actual thickness of the steel was not 0.0195 in. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: The committee agrees that the Code clearly states that the galvanized sheet steel is to be 0.0195 in. (0.5 ram) thick.

(Log #49) 54- 114 - (6.7.1): Accept in Principle Note: This proposal appeared as comment 54-193 which was held

for fur ther study from the Annual 92 TCD, which was on proposal N/A. SUBMITTER: Eric Hawkinson, Heatilator RECOMMENDATION: Add to existing:

"Listed vented decorative appliances may be installed in bathrooms or bedrooms provided the room is an unconf ined space (see 5.3.2 and Section 1-7, definitions)." SUBSTANTIATION: Because of the existing wording we receive a large number of call (10 per month minimum) by building inspectors red "ng and re!quiring removal of product based on t a g g l . . . . .

the standard not stating specifically that ]t is okay for a hsted appliance to be installed in this location. COMMITTEE ACTION: Accept in Principle.

Revise 6.7.1 to read: "Vented decorative appliances shall not be installed in bathrooms

or bedrooms unless the appliance is listed, and the bedroom or bathroom is an unconf inedspace . (See 5.3.2 and Section 1.7, Definitions.)" COMMITTEE STATEMENT: Revised coverage correlates with present 6.6.1 of the Code.

(Log #47) 54- 111 - (6.4.3(a) Note): Reject Note: This proposal appeared as comment 54-187 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: Larry Wrobel, Speed Queen Co. RECOMMENDATION: The "note" should be revised as follows:

NOTE: A Type 1 dryer must be exhausted to the outside and therefore consideration must be given to provisions for make-up air.

(Log #50) 54- 115 - (6.8.5(a)): Reject Note: This proposal appeared as comment 54-196 which was held

for fur ther study from the Annual 92 TCD, which was on proposal N/A. SLIBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Remove "in accordance with the terms of their listing" so the section reads as follows: ""

(a) Listed direct make-up air heaters shall be equipped with airflow sensing devices, safety shutoff devices, operating temperature controls, and thermally actuated temperature limit controls.

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N F P A 54 - - A 9 6 R O P

SUBSTANTIATION: L'isted direct make-up air heaters, by definition, are requi red to have all four controls a n d dxe E qu i pmen t Installation Advisory Panel 's r e commenda t i on that the phrase "terms of its listing" be removed is appropria te as tha t is covered in 6.1 (b). COMMITI 'EE ACTION: Reject. C O M M I T r E E STATEMENT: Refer to Commi t tee Action on Proposal 54-105 (Log #42).

(Log #104) 54- 116 - (6.9 t h rough 6.0.3): A c c e p t SUBMITTER: Will]am S. Bigelow, Wlaplewood, NJ RECOMMENDATION: Change the text of 6.9 t h rough 6.9.3 to read as follows:

6.9 Direct Gas-Fired Industrial Air Heaters. 6.9.1 Application. (a) L~azcd Direct gas-fired industrial air heaters shall be listed in

accordance with Standard for Direct Gas-Fired Industrial Air Heaters, ANSI Z83.18.

6.9.2 Prohibi ted Installations. Direct gas-fired industrial air heaters shall no t use recirculation

of room air in buildings that contain f lammable solids, liquids or gases, explosive materials or substances that may become-toxic when

~ ( ' g ; s ~ ) i ' r e c t ~ a ~ f i ~ , s t r i a l air heaters shall no t be installed in any area conLainin~ slee~in~ uuarters.

6~9.3 Installation7 " ~ " (a) Listed direct ~as-fired industrial air heaters shall be nermi t ted

to be installed in a6cordance with their listin~ and the manufac ture r ' s instructions.

(b) Unlisted direct •,as-fired industrial air heaters shall no t be

Excention: Unlis ted e u u i n m e n t shall be nermi t ted to be installed when the installation is a.~6roved bv the atithoritv havin~ iurisdiction and a site s~eciflc eouinn3~nt evaluation is n e r f o h n e d b ~ n i nde~endeh t testinffas/enev based on the ab~licable redui rements of s tandard for direct ~asT-firect industrial air h'e'aters. ANSfZ83.18.

LQ. ~'a-)- Direct gas-fired industrial air heaters shall be installed only in inc~ustrial or commercial occupancies.

~ Direct gas-fired industrial air heaters shall be permi t ted to provide fresh air ventilation. SUBSTANTIATION: The re-an-angement and addit ion of die text will make the code more understan~table, usable and etfforceable. In addition, there are a mul t i tude of substances in e workplace which become toxic when exposed to heat alone. This a m e n d m e n t will more clearly define the areas of concern. COMMITI 'EE ACTION: Accept.

(Log #105) 54- 117 - (6.9.5 Note): Accept SUBMITTER: William S. Bigelow, Maplewood, NJ RECOMMENDATION: Change d ie text of the N O T E t o read, in part, as follows:

NOTE: Recirculation of room air may be hazardous in the

~ resence of f lammable solids, liquids or gases, explosive materials e.g., grain dust, coal dust, g u n powder), and substances

ret?i~erants, aerosols, etc.)flaat inay become toxic when exposed to flam~ or heat (c.~., ccfAgc, o ~ , , ac;,,~,~l~, ztc.) SUBSTANTIATION: Tfiere are a mul t i tude of substances in be workplace which become toxic when exposed to heat alone. This amer idmen t will more clearly define the-areas of concern. C O M M I T r E E ACTION: Accept.

(Log #51) 54- 118- (6.1O.l(a)): Reje,zt Note: This proposal appea red as c o m m e n t 54-216 which was he ld

for fur ther study f rom die .~amual 92 TCD, which was on proposal N/A. SUBMITTER: William S. Bigelow, BigelowAssociates RECOMMENDATION: Revise 6.10.1 (a) by adding, an exception and delet in~ "terms of its listing" and replace with 'manufac ture r ' s instructions so as to read as foIlows:

(a) Listed duct furnaces shall be installed witb clearances of at least 6 in. between adjacent walls, ceilings, and floors of combust ible material and the furnace draft hood. In no case shall the clearance be such as to interfere with combust ion air and accessibility. (See 5.2.1 and 5.3.)

Exception: Furnaces listed for installation at lesser clearances shall be permi t ted to be installed in accordance with the manufac tu re r ' s instructions. SUBSTANTIATION: Editorially, the second half of the first sentence in -a is an except ion and should be treated as one. In addition, the Equ ipmen t Installation Advisory Panel 's r ecommenda- tion tha t the phrase "terms of its listing" be removed is appropr ia te as that is covered in 6.1 (b). COMMITI 'EE ACTION: Reject. C O M M r r r E E STATEMENT: Refer to Commit tee Action on Proposal 54-105 (Log #42).

(Log #156) 54- 119 - (6.10.5): Accept SUBMITTER: Norm Mattson, Modine Mfg. Co. RECOMMENDATION: In second paragraph of 6.10.5, delete "if the duct furnace is connec ted to a re turn air duct or any o ther inlet air restriction,"

Start sentence "The duc t furnace shall be installed on the positive

g ressure side o f the circulating air blower." UBSTANTIATION: This paragraph as it reads allows duc t

furnaces, with no a t tachments , to be installed on the negative

~ ressure side of the circulating air blower. This does n o t p r e v e n t the eat exchanger f rom exper iencing a negative pressure, which may

result in contamina t ing the circulating air s t ream with products of combust ion if a hea t exchanger failure should occur. This negative pressure varies by the quanti ty of air be ing drawn th rough the uni t and by baffles that some manufac ture rs install on die uni t inlet to control air distribution. A significant negative pressure can develop on the heat exchanger while die installation still meets the require- m e n t of this paragraph.

Additionally, since duc t furnaces are tested to ANSI s tandards with ductwork at tached to die inlet and outlet, there is no evidence to assure that the action of the draft h o o d is unaffected when an inlet duct is no t installed, especially if the relief open ing of the draft h o o d is adjacent to the inlet air side of the furnace, ff sufficient air is being drawn th rough the unit, it is possible that combus t ion products will be drawn directly out of the draft hood.

As long as the duct furnace is installed on the negative pressure side of the blower, the potential hazard of in t roducing combust ion products into the circulating air s t ream still exists whe the r or no t there are any inlet air restrictions. Therefore, this should no t be allowed and the duc t furnace shou ld always be installed on the positive pressure side of the circulating air blower. C O M M I T r E E ACTION: Accept.

(Log #52) 54- 120- (6.11): Reject Note: This proposal appeared as c o m m e n t 54-218 which was he ld

for fur ther s t u d y f r o m the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: JamesJ . Glanville, Denver Bldg. Inspection Dept. RECOMMENDATION: Revise text as follows:

"Floor Furnaces should be prohibi ted as they present an extremely hazardous installation where occupants can be severely burned." SUBSTANTIATION: None. COMMITI 'EE ACTION: Reject. C O M M I T r E E STATEMENT: There are floor furnaces cur rendy certified to the Z21.48. There is also no technical substantiat ion for die proposal.

(Log #53) 54- 121 - (6.11.2(a)): Reject Note: This proposal appea red as c o m m e n t 54-220 which was he ld

for fur ther study f rom die Annual 92 TCD, which was on proposal N/A~ SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Remove "in accordance widi the terms of their listing" so the section reads as follows:

(a) Listed Automatically opera ted floor furnaces shall be equ ipped with t empera tu re limit controls. SUBSTANTIATION: The Equ ipment Installation Advisory Panel 's r ecommenda t ion that the phrase "terms of its listing" be removed is appropriate as the installer need only know that listed equ ipmen t required tempera ture limit controls. C O M M I T r E E ACTION: Reiect. COMMITI 'EE STATEMENT: Refer to Commit tee Action on Proposal 54-105 (Log #42).

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N F P A 5 4 - - A 9 6 R O P


for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: Jeffrey D. Hilleary, Denver Bldg. Dept. Engineering RECOMMENDATION: Revise text:

"Enclosure should be required in all cases." SUBSTANTIATION: Basements can be later converted to apar tment or sleeping quarters without the knowledge of the authority having jurisdiction and thus an unsafe situation could be created with ease. COMMITTEE ACTI ON: Reject. COMMITTEE STATEMENT: There is no need to enclose furnaces unless occupancy separation is required.


for fur ther study from the Annual 92 TCD, which was on proposal N/A.

SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Remove "its listing and" so the section reads as follows:

6.12.1 Clearance for Listed Ecluipment. Listed f loor-mounted food service equipment, such as ranges for hotels and restaurants, deep fat fryers, uni t broilers, gas-fired kettles, steam cookers, steam generators, and baking air roasting ovens, shall be installed at least 6 in. from combustible material except that at least a 2-in. clearance shall be maintained between a draft hood and combustible material. Floor-mounted food service equipment listed for installation at lesser clearances shall be permit ted to the installed in accordance with the manufacturer 's instructions. Equipment designed and marked "For use only in noncombust ible locations" shall not be installed elsewhere. SUBSTANTIATION: The Equipment Installation Advisory Panel 's recommendat ion that the phrase "terms of its listing" be removed is appropriate as that is covered in 6.1 (b). COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-105 (Log #42).

(Log #56) 54- 124- (6.12.2 Exception No. 1): Reject Note: This proposal appeared as comment 54-225 which was held

for fur ther study f rom the Annual 92 TCD, whicb was on proposal 54-79. SUBMITTER: James M.Jagers, Rapid Engineering Inc. RECOMMENDATION: In Excepuon No. 1 remove ", but not in particularly enclosed areas such as alcoves." Add proposed wording for paragraph "b": "Unlisted f loor-mounted

food service equipment shall no t be installed in partially enclosed areas such as alcoves." SUBSTANTIATION: Editorial comment. Makes sentence less wordyand easier to read. Also clearly states where unlisted food service equipment shall no t be installed. COMMITrEE ACTION: Reject.

Remove asterisk (*) from Exception No. 2. COMMI'I"rEE STATEMENT: There is no reference in Appendix A to Exception No. 2 in 6.12.2(a).

The submitter 's proposal is unclear.

COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-124 (Log #56).


for fur ther study from the Annual 92 TCD, which was on proposal N / & SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Remove "their listing and the accompanying" and replace with "the manufacturer 's" so as to read as follows:

6.12.6 For UseWith Casters. Floor-mounted equipment with casters shall be listed for such construction and shall be installed in accordance with the manufacturer 's instructions for limiting the movement of the equipment to prevent strain on the connection. SUBSTANTIATION: T h e Equipment Installation Advisory Panel's recommendat ion that the phrase "terms of its listing be removed is

DS~T][ate as that is covered in 6.1 (b). EE ACTION: Reject.

COMMITTEE STATI/~ENT: Refer to Committee Action on Proposal 54-105 (Log #42).

(Log #59) 54- 127 - (6.15.1(b).2): Reject Note: This proposal appeared as comment 54-233 which was held

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: JamesJ . Glanvi|le, Denver Bldg. Inspection Dept. RECOMMENDATION: The stated thickness of 0.0122 in. for a sheet metal ventilating hood is in conIlict with the minimum stated thickness of 0.024 in. in the Uniform Mechanical Code (1988 Ed.). SUBSTANTIATION: None. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: There is not adequate technical substantiation provided with the submitter 's proposal.

(Log #158) 54-128 - (6.24.1): Reject S U B ~ Robert E. Rhead, Kemper National Insurance Cos. RECOMMENDATION: Return the wording to that published in the 1992 edition.

"6.24.1" Prohibited Installations. Unren ted room heaters shall not be installed in bathrooms or bedrooms." SUBSTANTIATION: The Committee changed this prohibition at the Feb. 2, 1994 meet ing after arguments that it was a safe installation and no injuries etc. had been reported. See attached item from NFPAJournal May/June 1994 detailing 5 burn victims and property damage as a result of an ignition from an open flame natural gas space heater in a bathroom. These dangerous installations should not be permit ted in the code.

NOTE: Supporting material is available for review at American Gas Association Laboratories and NFPA Headquarters. COMMIT~E ACTION: Reject- COMMITTEE STATEMENT: There is incomplete technical substantiation provided with the submitter 's proposal. Current coverage in the Code is consistent with that in the Z21.11.2 unren ted room heater standard.

(Log #57) 54- 125 - (6.12.2 Exception No. 2): Reject Note: This proposal appeared as comment 54-226 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: James M. Jagers, Rapid Engineering Inc. RECOMMENDATION: In Exception No. 2 remove ", but not in partially enclosed areas such as alcoves," SUBSTANTIATION: See Committee Statement for 6.12.2 Exception No. 1.

Comment: If the proposed Section 6.12.2 b. is not accepted, remove the paragraph let ter identifier, "a.".

Editorial comment. COMMITrEE ACTION: Reject.

(Log #191) 54-129 - (6.24.1 Exceptions No. 1 and 2): Reject $UBMrf'FER: IL T. Leicht , Fire Marshal's Office, Springfield, PA

RECOMMENDATION: Delete Exception No. 1 and delete Exception No. 2. SUBSTANTIATION: It is a violation of safety logic to allow installation of a device, which is known to generate carbon monoxide, when it is anticipated that the occupant is not awake and therefore no t aware of the hazard being developed. The TIA recognizes the hazard by limiting the size of the units permitted, however, if the room is small enough or the uni t runs long enough, the unacceptable condition will still be created.

The provision for combustion and ventilation air is unenforceable except on the day that the equipment is being approved.

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N F P A 5 4 - - A 9 6 R O P

There is not guarantee that any oxygen deplet ion safety shutoff system will operate as designed.

These units will be installed after obtaining approval from a single AHJ al though a facility may be subject to various authorities having jurisdiction. For instance,just because a Director of Facilities approves this equipment for a sorority house, doesn ' t mean that the insurance company will. Additionally, even if the insurance company doesn ' t object, it may be because the insurance company is only the property carrier, and as such, may not be concerned with life safety. Fire Marshals, where shown, don ' t want to see this equipment in small rooms, especially bedrooms and want to see the

Pu h return to its odginal language in the 1992 edition, T ANY EXCEPTIONSI

NOTE: This proposal deals with the "A" agenda /TIA 92-1 to the National Fire Gas Code. COMMITFEE ACTION: Reject. COMMITrEE STATEMENT: Refer to Committee Action on Proposals 54.128 (Log #158) and 54.130 (Log #202).

(Log #202) 54. 130 - (6.24.1 Exceptions No. 1 and 2): Reject SUBMITTER: Donald P. Donovan, Office of the State Fire Marshal RECOMMENDATION: Delete Exception No. 1 and delete Exception No. 2. SUBSTANTIATION: It is a violation of safety logic to allow installation of a device, which is known to generate carbon monoxide, when it is anticipated that the occupant is not awake and therefore no t aware of the hazard being developed. The TIA recognizes the hazard by limiting the size of the units permitted, however, if the room is small enough or the unit runs long enough, the unacceptable condition will still be created. The provision for combustion and ventilation air is unenforceable

except on the day that the equipment is being approved. There is not guarantee that any oxygen deplet ion safety shutoff

system will operate as designed. These units will be installed after obtaining approval from a single

authority having jurisdiction although a facility may be subject to various authorities having jurisdiction. For instance, just because a Director of Facilities approves this equ ipment for a sorority house, doesn ' t mean that the insurance company will. Additionally, even if the insurance company doesn ' t object, it may be because the insurance company is only the property carrier, and as such, may not be concerned with life safety. Fire Marshals, where shown, don ' t want to see this equipment in small rooms, especially bedrooms and want to see the paragraph return to its original language in the 1992 edition, WITHOUT ANY EXCEPTIONSI

THIS PROPOSAL DEALS WITH THE "A" ADDENDA, TIA 92-1 (NFPA 54) TO THE NATIONAL FIRE GAS CODE. COMMrITEE ACTION: Reject. COMMI'ITEE STATEMENT: Refer to Committee Action on Proposal 54.128 (Log #158).

Under Z21.11.2, the heaters will be tested in a closed room to verify the integrity of the oxygen deplet ion system and combustion performance. The Code limits installations to listed heaters.

(Log #109) 54.131- (6.24.1 Exceptions No. 1 and 2 (New)): Accept SUBMITrER: Leonard Pakrnda, Montgomery, AL RECOMMENDATION: Add two Exceptions to 6.24.1 to read as follows:

Exception No. 1: Where approved by the authority having jurisdiction, one listed wall-mounted unren ted room heater equipped with an oxygen deplet ion safety shutoff system shall be permit ted to be installed in a bathroom provided that the input rating shall not exceed 6000 Btu per hour (1760 W / h r ) and combustion and ventilation air is provided as specified in 6.1 (b).

Exception No. 2: Where approved by the authority having jurisdiction, one listed wall-mounted unren ted room heater equipped with an oxygen deplet ion safety shutoff system shall be permit ted to be installed in a bedroom provided that the input rating shall not exceed 10,000 Btu per hour (2930 W / h r ) and combustion and ventilation air is provided as specified in 6.1 (h). SUBSTANTIATION: Significant fire losses have occurred in Alabama residential bedrooms and bathrooms because of the cont inued use of unserviceable old-style un ren ted room heaters, some of which are of the open flame type. Many of these heaters were installed over 30 years ago and have remained in cont inued operation under provision of the grandfather clause. In my opinion, most of the old-style room heaters now in service are worn out; they are dangerous and should be replaced without fur ther delay. This proposed TIA/addendum, if approved, will allow the replacement of

the old-style unvented room heaters with the latest technology unvented room heater equipped with an oxygen deplet ion safety shutoff device.

After much research and engineer ing study, the ANSI construction standards for unren ted roomhea te r s have changed to include the incorporation of new safety requirements and technology to protect the user. Unren ted room heaters now operate with a greatly reduced cabinet temperature and lower carbon monoxide emissions. The protection guards a round the flame box have been redesigned to reduce the possibility of ignition of fabrics and clothing and all unvented room heaters require an oxygen deplet ion shutoff safety device. The new heater is more efficient.

Newly constructed unren ted room heaters have an excellent track record in performance mad in safety. The recent revision to the Unvented Room Heater standard ANSI Z21.11.2-1992 Part I, Volume II 1.1.1 (A) (B) now makes allowances for use of un ren ted room heaters in bathrooms and bedrooms.

I recognize that in many states this type of appliance has no t been used to the extend that it is used in Alabama and other southern states. By making the provision in the code subject to the approval of the authority having jurisdiction, each state, city, etc. can de termine ff these appliances are appropriate for its own jurisdiction. COMMITTEE ACTION: Accept.

(Log #212) 54.132 - (6.30.1): Accept in Principle SUBMITTER: James A. Ranfone, American Gas Association RECOMMENDATION: Revise Section 6.30.1 as follows:

6.30.1 Prohibited Installations. (a) Water heaters shall not be installed in bathrooms, bedrooms,

or any occupied rooms normally kept closed. Also see 5.1.8 for flammable vapors.

Exception N o l : Direct vent water heaters. Exception No. 2: Water heaters shall be oermit ted in a closet

iocate~i in a bathroom, bedroom or anv o~cunied room normally kent closed when the closet is used exclusively for a water heater'. wtiere the enclosed snare has a weather-strinDed solid door with a door closing device ahd where combustion kir is obtained from the

SUBSTANTIATION: To permit the installation of water heaters is a closet located in a bathroom, bedroom or other occupied room normally kept closed. The proposed requirements are based on coverage similar to a exception in the Standard Gas Code for furnaces (section 507.1). The four requirements that must be met to qualify for the exception are designed to minimize any accidental combustion product spillage in the room. The four requirements are: 1. the closet be exclusively for the water heater;, 2. the closet door be weather stripped; 3. the door have a closing device and; 4. combustion air be obtained from the outdoors. COMMITTEE ACTION: Accept in Principle. Accept the proposal and revise to read: Excention No. 2: Water heaters shall be Dermitted to be installed

in a clbset located in a bathroom, bedroom or any OCCUDied room normally kent closed where the closet is used exciusivel~ for a water heater. ~rhe~e the enclosed space has a weather-striDDed solid door with a self-closing device and 'where all combustion'a)r is obtained from the outdoors. COMMI'ITEE STATEMENT: To clarify the proposal.

(Log #60) 54- 133- (6.30.1(b)): Reject Note: This proposal appeared as comment 54.250 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-79. SUBMITTER: J a m e s J . Glanville, Denver Bldg. Inspection Dept. RECOMMENDATION: Revise text as follows:

"Kitchen sections of light housekeeping rooms or rooms used by transients" is too nebulous and needs fur ther clarification and defining. SUBSTANTIATION: None. COMMIT]tEE ACTION: Reject. COMMITTEE STATEMENT: The submitter did no t provide a proposal or substantiation. The committee noted that the reason for no t allowing installation of this type of product in "light housekeeping rooms" or "rooms used by transients" is because of the user's unfamiliarity of the operation or presence of this type of equipment.

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(Log #167) 54- 134- (6.30.6): Accept in Principle SUBMITTER: Paul A. Cama, Long Island Lighting Company RECOMMENDATION: Add:

1. Relief Valves shall be piped to discharge approximately 18 in. f rom the floor.

2. Discharge piping shall be at least the same size of the relief valve discharge tapping.

3. Discharge piping shall not contain threaded end connection at its termination point. SUBSTANTIATION: To provide a safe work area for service personnel. COMMITTEE ACTION: Accept in Principle. COMMITI'EE STATEMENT: Refer to Committee Action on Proposal 54-108 (Log #170).

(Log #163) 54- 135 - (Part 7, Table X): Reject SUBMITTER: Wilbur L. Haag, Jr., A. O. Smifl~ Water Products Company RECOMMENDATION: Revise the heading for the third column to:

Vent Connector o r

Single-Wall Metal Pipe

SUBSTANTIATION: This table is referred by paragraph 7.10.6 for vent connector clearance. The term "vent connector" does not presently appear anywhere in the table. COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: The Committee no ted that the Table reference in 7.10.6 should be Table X not Table IX and should be editorially revised.

(Log #61) 54-136 - (7.2.2(d)): Reject Note: This proposal appeared as comment 54-255 which was held

for fur ther study from the Annual 92 TCD, which was on proposal N/A~ SUBMITTER: la r ry Wrobel, Speed ,~,ueen Co. RECOMMENDATION: Eliminate "d' f rom the list. SUBSTANTIATION: Type 1 clothes dryers should be vented to the outside. Current ANSI dryer standards now suggest dais when a dryer is installed in a closet. We are suggesting that all Type 1 dryers should be vented to the outside. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Committee agrees that coverage specified in 7.2.2(d) is correct and requirements for exhausting clothes dryers to the outside are provided under Section 6.4.

( Log #CP31 ) 54-137- (7.2.2(d)): Accept SUBMITTER: National Fuel Gas Code Committee, RECOMMENDATION: Revise 7.2.2(d) to delete "Listed Type 1" and revise "6.4.4" to "6.4" to read:

(d) Clothes dryers (see 6.4) SUBSTANTIATION: To eliminate tile misconception that Type 2 clothes dryers can be vented. COMMITTEE ACTION: Accept.

(Log #128) 54- 138 - (7.2.2(e)): Reject SUBMITTER: Joel F. Hipp, PMI Food Equipment Group (Hobart) RECOMMENDATION: Delete "NationalSanitation Foundation Class 1, 2, or 3" SUBSTANTIATION: NSF International Listing of a commercial dishwasher should not be a prerequisite of a booster vent system. Also, what is the definition of "Class 1, 2, or 3"? COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: This change was done during the last Code cycle.

(Log #127) 54-139 - (7.2.2(1).1 (New)): Accept in Principle SUBMITTER: Joel F. Hipp, PMI Food Equipment Group (Hobart) RECOMMENDATION: Proposed new wording:

(I) 1" A single listed gas-fired dishwasher, provided that the input is limited to 50,000 Btu per hour, and the unit is installed, with the draft hood in place and unal tered (if applicable), in a commercial kitchen having a mechanical exhaust system. When installed in this manner , the outlet shall not be less than 36 in. vertically and 6 in. horizontally from any surface other than the appliance. SUBSTANTIATION: ff the objective is an appliance with limited B T U / h r rating is no t required to be vented, dishwashers should be allowed as well. COMMITTEE ACTION: Accept in Principle.

Replace the word, "heater" with the word "equipment" in 7.2.2(e) in 2 locations. COMMITTEE STATEMENT: To editorially clarify the provision.

(Log #62) 54- 140 - (7.2.4): Reject Note: This proposal appeared as comment 54-257 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-108. SUBMI'VrER: JamesJ . Glanville, Denver Bldg. Inspection Dept. RECOMMENDATION: Add "only if properly engineered and

~ ermitted by governing codes." UBSTANTIATION: This presents too hazardous of a situation if

not properly designed to dilute the flue gases to a safe level. COMMITrEE ACTION: Reject. COMMITI'EE STATEMENT: The Committee disagrees because no data is provided to substantiate the change.


for fur ther study from the Annual 92 TCD, which was on proposal 54-108. SUBMITI'ER: Jeffrey D. Hilleary, Denver Bldg. Dept. Engineering RECOMMENDATION: Revise text:

"Should not be permitted. Flue gases should no t be permit ted to build up in a space with the potential for no ventilation." SUI[~TANTIATION: A. "Large" space is not refined; what is a "large" space?

B. What is a "well-ventilated" space? C. Subjective terms such as these could result in a hazardous

buildup of flue gases. D. Should specify a min imum ventilation rate and require an

interlock with the appliance gas valve. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action taken on Proposal 54-140 (Log #62).


for further study from the Annual 92 TCD, which was on proposal N / ~ SUBMITTER: Clifford E. Hennig, Denver Bldg. Inspectn Div. RECOMMENDATION: Change wording to read as follows:

"Industrial gas utilization equipment may be operated by discharg- ing the flue gases directly into an interior space whenever there is a mechanical ventilation system in place that introduces, into the space, not less than 4 cfm of outside air per 1000 BTU per hr of rated input and exhausts an equal amount of air to the outside. An interlock shall be provided so as to lock out the main burner unless the mechanical ventilation is verified." SUBSTANTIATION: This paragraph, which allows flue gases to be discharged directly into a large, well-ventilated space is a carryover from the 1988 issue, however it lacks clear definition by using the

neral terms "large" and "well-ventilated." MMITI'EE ACTION: Reject.

COMMITTEE STATEMENT: Refer to Committee Action taken on Proposal 54-140 (Log #62).

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N F P A 5 4 - - A 9 6 R O P

54-143 - (7.2.5): Reject (Log #65) Note: This proposal appeared as comment 54-260 which was held

for fur ther study from the Annual 92 TCD, which was on proposal N/A. SUBMITTER: Willianl S. Bigelow, Bigelow Associates RECOMMENDATION: Revise 7.2.5 by deleting "terms of its listing," so as to read as follows:

7.2.5 Direct Vent Equipment. Listed direct vent gas utilization equipment shall be considered proper lyvented when installed in accordance with the marmfacturer 's instructions, and 7.8(c). SUBSTANTIATION: The Venting Advisory Panel 's recommendation that the phrase "terms of its listing" be removed is appropriate as that is covered in 7.1. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: The committee believes that the phrase, "terms of its listing" should be included in the paragraph for clarity.


for fur ther study from the Annual 92 TCD, which was on proposal N/A. SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: Revise 7.2.6 by adding "Listed" and removing "its listing," to read as follows:

7.2.6 Equipment with Integral Vents. Listed gas utilization equipment incorporating integral venting means shall be considered properly vented when installed in accordance with the manufacturer 's instructions, and 7.8(a) and (b). SUBSTANTIATION: This section should apply to only listed gas utilization equipment. Also, the Venting Advisory Panel 's recommendat ion that the phrase "terms of its listing" be removed is

eEEas that is covered in 7.1. ACTION: Reject.

COMMITrEE STATEMENT: Refer to Committee Action on Proposal 54-143 (Log #65).

(Log #162) 54- 145 - (7.2.6): Reject: SUBMITTER: Wilbur L. Haag, Jr., A. O. Smith Water Products Company RECOMMENDATION: Delete thisparagraph. SUBSTANTIATION: A direct vent design may have its venting provisions Factory assembled. Direct vent equipment is adequately covered by 7.2.5 and the term is defined. Since the term "integral venting means" is not defined, the intent of this paragraph is not F8aren

TrEE ACTION: Reject. COMMITTEE STATEMENT: The Committee agrees that an integral vent is not necessarily a direct vent but i s furnished with the appliffsace.

(Log #139) 54- 146 - (7.3.1(a) (New)): Reject SUBMITTER: Melvin W. Schroeder, .Bridgewater, N.J. RECOMMENDATION: Add to present 7.3.1, the following:

(a) In designing and constructing a venting system the requirements of 5.3 Air for Combustion and Ventilation must also be satisfied. SUBSTANTIATION: Numerous incidents investigated by the submitter indicate that many designers and installers of gas venting systems fail to take into account the need for adequate air for combustion and ventilation, as required in 5.3. COMMIT]['EE ACTION: Reject. COMMI'['rEE STATEMENT: The Committee agrees present text is correct as written. Coverage for air for combustion and ventilation is covered under 5.3.

(Log #CP32) 54-147- (7.3.4 (f)): Accept SUBMITTER= National Fuel Gas Code Committee, RECOMMENDATION: (f) Mechanical draft systems shall be sized and installed in accordance with the terms of their listing and the manufacturer 's Jnstru cdous.

SUBSTANTIATION: The Committee believes that for mechanical draft systems, it is important to consult the manufacturer 's instructions and listings. Therefore, coverage has been added to address proper sizing of mechanical draft systems. COMMITTEE ACTION: Accept.

(Log #67) 54-148 - (7.3.5, (a), and A.7.3.5 ): Reject Note: This proposal appeared as comment 54-262 which was held

for fur ther study from the Annual 92 TCD, which was on proposal N/A. SUBMITTER: William S. Bigelow, Bigelow Associates RECOMMENDATION: I. Move the * from the end of the text in 7.3.5 to directly follow the numerical identification so as to read as follows:

7.3.5* Ventilatin~g Hoods and Exhaust Systems. 2. Replace "may' with "shall be permit ted to" in 7.3.5(a) so as to

read as follows: (a) Ventilating hoods and exhaust systems shall be permit ted to be

used to vent gas utilization equipment installed in commercial applications.

3. Add an Appendix note to Appendix A to read as follows: A-7.3.5 Information on the construction and installation of

ventilating hoods may be obtained from the Standard for the Installation of Equipment for the Removal of Smoke and Grease- Laden Vapors from Commercial Cooking Equipment, ANSI/NFPA 96. SUBSTANTIATION: The moving of the * and addition of a notation, in Ap[3 endix A are editorial, in nature. Also , the Ventin. g Advisory Panel s r ecommendauon that the phrase terms 9f its listing" be removed is appropriate as that is covered in 7.1. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Committee disagrees as these proposals were addressed during the last Code cycle.


for fur ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITTER= JohnJackl ich, Simpson Dura-Vent RECOMMENDATION: Add the following new text:

Gzz Utilization Eauioment Decorative appliahce in vented fireplace ADD Type of Venting

Chimney (6.6.2B) Type B-Gas Vent (7.6) Listed Chimney Lining System for Gas Venting (7.5.1-C)

SUBSTANTIATION: Fireplaces of masonry type or factory built, do not have the proper size chimney system for the decorative appliances, leaving the door open for corrosion due to condensation. COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: Decorative appliances, in vented fireplaces, are listed in accordance with Z21.60 for installations in fireplaces which must be vented by chimneys. The proposed change would be contrary to chimney venting required in NFPA 211 and local building codes.


for fur ther study from the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: TimothyJ. Dwyer, Tjernlund Products Inc. RECOMMENDATION: Add the following new text:

Gas Utilization Eouioment

Listed Category I Equipment Listed equipment equipped with draft hood Equipment listed for use with Type B gas Vent

Type of Venting System

T~pe B gas Vent (7.6) imney (7.5)

Single-wall metal pipe (7.7) Listed chimney lining system for gas venting (7.5.1-c Special Gas Vent (7.4.g) Listed Mechanical draft systems 7._(zaal

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N F P A 54 - - A 9 6 R O P

SUBSTANTIATION: The i ndus i on of listed Mechanical draft systems as permi t ted in Section 7.3.4 will el iminate existing confusion. Some authori t ies have no t allowed the installation o f listed mechanical draft systems in the past since they were no t n a m e d u n d e r this section. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Commit tee does no t agree that Table IX should have "Mechanical Draft Systems" added as the table deals only with the type of ven t materials (i.e. Type B vent, SWMP, Chimney, etc.) Mechanical systems are covered u n d e r 7.3.4 which does no t prohibi t vent fans.

(Log #70) 54- 151 - (7.4.1): Accept in Principle Note: This proposal appea red as c o m m e n t 54-265 which was he ld

for fur ther study f rom the Annua l 92 TCD, which was on proposal N/A. SUBMITTER: Ted Zanias, Amer ican Metal Products Div of Masco RECOMMENDATION: Delete Type L vent f rom the list indicat ing tha t it is suitable for use with combina t ion gas a n d oil-burning equipment . SUBSTANTIATION: The m a n n e r in which Type L vent is shown in this list is confusing and can lead to misuse of the product . Type L Vent is no t UL listed for use with combinat ion gas and oil bu rn ing equipment . Type L vent can be used for listed oil bu rn ing equip- m e n t that has been tested a n d found suitable for such venting. All o ther oil bu rn ing equ i pmen t mus t use a chimney. At present, there are no oil bu rn ing appliances listed by UL for vent ing with Type L vent. Also, see 7.~.4(a) for possible conflict. COMMITTEE ACTION: Accept in Principle.

Add a Note "The use of Type L vent shall be l imited to those appliances listed for use with Type L or Type B vent." COMMITTEE STATEMENT: There is e q u i p m e n t listed for type l and type b vent.

(Log #71) 54-152- (7.4.3(a) (New)): Reject Note: This proposal appea red as c o m m e n t 54-270 which was he ld

for fur ther s tudy f rom the A n n u a l 92 TCD, which was on proposal 54-16. SUBMITTER: J o h n Jacklich, Simpson Dura-Vent RECOMMENDATION: Add 7.4.3(a) as follows:

"Listed corrugated a l u m i n u m vent connectors may be sized in accordance with Tables 11-1, 11-3, 11-6, a n d 11-8." SUBSTANTIATION: Several gas vent manufac tu res have now in t roduced corrugated a l u m i n u m single-wall vent connectors which provide corrosion - free pe r fo rmance equivalent to Type B gas vent.

Vent II Analysis confirms no spillage and negative vent pressures at m a x i m u m Btu's listed to Type B gas vent. Vent II confirms a m i n i m u m 25 to 50 pe rcen t reduct ion in condensa te wet times.

Laboratory testing confirms flue gas t empera tu re loss to be essentially identical to B vent connectors due to less mass in the connector , and a static zone of gas t rapped in the corrugat ion valleys tha t serves as a thermal barrier to hea t loss.

Vent connectors have been oversize 1 / 4 in. in diameter. Tests confirm vent pressurization equivalent to a smoo t h wall ven t at nomina l diameter.

Vent corrosion testing at Batelle Laboratories confirms far super ior corrosion resistance of a l u m i n u m vs. galvanized steel.

Corrugated a l u m i n u m vent connectors provide a new ease in installation, cost competitive with single-wall galvanized ven t connectors , a n d trouble-free performance. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: T he Commit tee disagrees with the submi t te r because there has no t been sufificient research that has been accepted as being valid by the gas industry.

(Log #130) 54- 153 - (7.5.2(a) and Figure 12): Reject SUBMITTER: Deborah A. Cash, Bock Water Heaters, Inc. RECOMMENDATION: Revise text as follows:

"(a) A ch imney for residential-type or low heat gas utilization e q u i p m e n t shall ex tend at least 3 ~'~. (~.~,,,) 5 ft (1.5m) above the h ighes t point ... a nd at least 2 ,% (?,.3.,) 4 ft (1.2m) h igher than any port ion of a bui ld ing within a horizontal dis tance o f 10 ft (3.0 m). (See Figure 12.)" Also a m e n d Figure 12 accordingly.

SUBSTANTIATION: Chimneys which terminate too close to the roof peak are susceptible to downdrafts, particularly when vent ing oil water heaters and a tmosphere gas water heaters equipped with power burners . O n several occasions, we have received calls f rom installers who had vented according to NFPA but were exper iencing downdraf t problems. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: There is no technical substantiat ion for the proposal nor details of problems in the field.

(Log #181) 54- 154- (7.5.3): Accept SUBMITTER: Hall Virgil, Carrier Corp. RECOMMENDATION: Revise 7.5.3 to read:

7.5.3 Size of Chimneys. The effective area of a ch imney vent ing system serving listed gas appliances with draft hoods, Category I appliances, and o ther appliances listed for use with Type B vents shall be in accordance with Part 11 or o ther approved eng ineer ing methods .

Exception No. 1: As an al ternate m e t h o d of sizing an individual ch imney vent ing system for a single appl iance with a draft hood, the effective areas of the ven t connector and ch imney flue shall be no t less than the area of the appliance flue collar or draft h o o d outlet, n o r trreater than seven t imes the draft h o o d outlet area.

Exception No. 2: As an al ternate m e t h o d of sizing a ch imney vent ing system connected, to more. than one atplpliance, all with draft hoods, the effectave area of the c h m m e y flue shall be not less than the area of the largest vent connector plus 50 percent of the area of addit ional flue collars or draft h o o d outlets, ~ f greater than seven t imes the smallest draf t h o o d oude t area. SUBSTANTIATION: New text is shown as "underl ine."

These revisions would prevent oversizing of ch imney vent ing systems for consistency with part 11 (page 170, note 9 an d page 184, note 14). The GAMA Vent ing Tables has inc luded this oversizing restriction since 1990 with satisfactory field results. COMMITrEE ACTION: Accept.

(Log #72) 54-155 - (7.5.3 Exception No. 2): Reject Note: This proposal appeared as c o m m e n t 54-278 which was he ld

for fur ther s tudy f rom the Annual 92 TCD, which was on proposal 54-108. SUBMITTER: Richard L. Stone, Bodega Bay, CA RECOMMENDATION: Reword as follows:

Exception No. 2 As an al ternate m e t h o d for sizing a ch imney vent ing system connec ted to more than one draft hood-equipped appliance, the effective area of the ch imney f lue shall he no t less t han the combined areas of all connec ted draft hood outlets. SUBSTANTIATION: a. The masonry chimneys in part icular it is especially impor tan t to have adequate area to compensa te for h igher flow losses due to tile irregularities, mor tar protrusions, air leakage th rough joints and use of unlisted caps or terminat ions. Also it usually no prob lem to construct a masonry ch imney tha t is large e n o u g h because the mos t c o m m o n prob lem is one that is greatly overside.

b. This proposal also affects factory-built chimneys, an d is offered for consis t tncy with proposals for single-wall pipe and gas v e n t 7.7.4 and 7.6.3.

c. This provision may also make it easier to install a liner system in a masonry ch imney f f the re is a fuel conversion to gas.

d. This rule of combined areas is consistent with7.10.3(b) , which applies to appliances having more than one draf t hood. The re is no logical difference in vent ing requ i rements between one appliance with three draft hoods, all opera t ing simultaneously, a n d three identical draft h o o d appliances also opera t ing simultaneously. The proposed total area rule should be adapted to el iminate this inconsistency.

e. The total area rule will result in having adequate vent ing area regardless of how many appliances are combined. Th e existing rule o f add ing 50 percen t may cause vent ing failure if combin ing too many appl iances causes the area to approach 50 percent of actual requirements .

f. The NFPA 211 commit tee is in process o f adopt ing a total combined area rule with certain limitations.

g. Adopt ion of the total area rule may lead installers to pay more at tent ion to the Tables, which in most instances will lead to more economical or improved vent selection.

h. Cont inua t ion of the 50 percent rule, which may cause vent ing failure with complicated combined or mani fo lded systems, poses liability problems for installers and vent ing p roduc t manufacturers .

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N F P A 54 - - A 9 6 R O P

i. Nei ther the 50 percent , no r the above proposed 100 percent rule, cover the impor tan t aspects of vent connector configuration. Also there is no al ternate rule for fan-assisted combust ion appliances. The Code would be greatly improved if the al ternate rule for two or more draft hood-equ ipped appl iances was d ropped completely, and the use of Tables was specified for all combined vent ing systems regardless of material used. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: There is no t adequate technical substantiat ion provided for the proposal.

(Log #73) 54- 156 - (7.5.3 Exceptions No. 1 and 2): Accept Note: This proposal appea red as c o m m e n t 54-279 which was he ld

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-108. SUBMIq[q'ER: Robert Borgeson, American Gas Assoc Laboratories RECOMMENDATION: Add to the exceptions:

No. 1. "... draft hood outlet, no r ~reater than seven times the draft v

hood 0ude t area." No. 2. ". . . draft hood outlets, no r gTeater tlaan seven times the

smallest draft hood outlet area." SUBSTANTIATION: Tiffs makes the exceptions compatible with the notes in Part 11. COMMITTEE ACTION: Accept.

(Log #218) 54- 157- (7.5.8 (New)): Accept in Principle SUBMITrER: David &Johns ton , DSJ Technical Services RECOMMENDATION: Add a new section 7.5.8 as follows:

7.5.8 Space Su r round ing Lining or Vent. The remain ing space su r round ing a ch imney liner, gas vent, special gas vent, or plastic piping installed within a masonry ch imney flue shall no t be used to vent ano the r appliance. This shall not prevent the insert ion of ano the r liner or vent within the ch imney as provided in this code and the liner or vent manufac tu re r ' s instructions. SUBSTANTIATION: There have been occasional problems with additional appliances, such as water heaters, being connec ted to the remain ing flue space after a plastic or a l u m i n u m gas v e n d n g system has been installed in an existing ch imneyf lue . Such installations are likely to be hazardous, since the outside of vent pipe is no t des igned to be ba thed in flue gases f rom ano the r appliance, and any sagging or d isp lacement of the vent pipe would block the flue. This proposal makes it clear that the remain ing flue space shall no t be used to ven t ano the r appliance. Similar language is cur rendy required to be included in the instructions for special gas vents listed unde r UL 1738. This proposal simply extends the r equ i r emen t to the o ther types of gas vent ing systems which could be installed within a chimney. COMMITTEE ACTION: Accept in Principle. Relocate last sen tence as an Exception and delete the phrase, "This

shall no t prevent" and keep "as provided in this code". COMMITTEE STATEMENT: The intent of the proposal is accepted, with the last sen tence relocated as an "Exception." This revision is consistent with Code format .

(Log #74) 54-158 - (7.6.1): Reject Note: This proposal appea red as c o m m e n t 54-284 which was he ld

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: Ted Zanias, Amer ican Metal Products Div of Masco RECOMMENDATION: Use the te rm "approved methods" instead of "engineered methods" in this section and t h r o u g h o u t Chapter 7 when referring to the Tables or o ther me t hods for sizing vents. SUBSTANTIATION: Use of the Tables in Section 11 or o ther approved me thods does no t and shou ld not require an "engineer" or his s ignature on a ven t sizing situation. COMMITrEE ACTION: Reject. COMMITI~E STATEMENT: T he Corrmaittee agrees tha t "engi- nee red methods" do no t require an engineer to per form them.

(Log #75) 54-159 - (7.6.1 (c) Exception): Accept in Principle Note: This proposal appea red as c o m m e n t 54-285 which was he ld

for fu r ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITrER: Richard L. Stone, Bodega Bay, CA RECOMMENDATION: Eliminate implication that use of the Section II Tables requires an engineer .

Revise to read: Exception: Systems sized as provided in Section 11 or in accor-

dance with o ther approved eng ineer ing methods . SUBSTANTIATION: Use of the Tables does no t and shou ld not require an "Engineer" or his s ignature on a vent sizing situation. COMMITTEE ACTION: Accept in Principle.

Revise Except ion to read "Systems des igned a n d sized as provided in Part 11 or in accordance with o ther approved engineer ing methods." COMMITrEE STATEMENT: There is no Section I 1 and to clarify the Exception.

(Log #219) 54- 160- (7.6.1(e)): Reject SUBMITrER: David &Johns ton , DSJ Technical Services RECOMMENDATION: Substitute the following text:

(e) Gas vents listed for installation within masonry chimneys shall b e p e r m i t t e d to be used in accordance with the terms of their listing a n d t h e manufac tu re r ' s instructions. A p e r m a n e n t identifying label shall be a t tached at the point where the vent enters the chimney. Tile label sball include the following message, or equivalent language'. 'q'his. gas . . . . . vent is for appliances that burn gas.. Do not ,, connect to solid or h q m d fue l -burnmg appliances or incinerators. SUBSTANTIATION: Gas vents can be, and have been, properly an d safely installed within existing masonry ch imney flues. For the most parL the installation considerat ions and techniques are similar to those employed for a s tandard vent installation in a f ramed structure. However, some aspects are different, and need to be specifically addressed in the te rms of the listing and manufac tu re r ' s instructions. These include:

- The need for the installer to inspect the ch imney for cracked or missing bricks, mortar, or o ther materials that could inhibit proper installation or performance; the need to check for the presence of combustible f raming materials e m b e d d e d within the chinmey; the need for t ho rough cleaning and removal of creosote or o ther combustible deposits. - Additional parts n e e d e d for installation within a ch imney (if any), - The me thods and parts needed for proper suppor t arid center ing

of the vent within the chimney. - The me thods and parts used to close o f f t he space su r round ing

the vent at the type of the ch imney to prevent the entry of rain water, animals, and debris, etc.

- A warning that the space su r round ing the vent shall no t be used to vent ano the r appliance.

It is necessary that this informat ion be communica t ed to the installer so that he can properly adapt the s tandard Type B vent installation to the un ique requi rements of a masonry ch imney installation.

The National Fuel Gas Code has long required that gas vents be listed and installed according to the terms of their listing. There is no reason that this shou ld not apply to gas vents installed within chimneys, a n d dais is stated explicitly in the cur ren t edit ion of the Handbook. However, there is no need for an additional listing or separate test s tandard; the relevant issues can be addressed th rough he cur rent UL 441 listing process. Revised or supplementa l instructions conta in ing the necessary informat ion can be submit ted to the listing agency as par t of the overall gas vent listing. This proposal will no t result in the need for revision of the cur rent listing labels for Type B vents.

As with gas-only ch imney liners, when a gas vent is installed within a masonry ch imney there is a need to warn homeowner s and future installers of the l imited use of the flue. The warning message proposed is the same as required in the Exception to 7.5.1 (c). COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: At present , there is coverage which allows for a vent to be installed in an u n u s e d ch imney flue in the Code [7.0.1(e)]. The re is no prohibi t ion of the use of listed vents within a masonry chimney. The Commit tee is advised that some manufac turers of gas vent materials have secured applicable p roduc t listings unde r UL standards. It is unde r s tood by the panel tha t the applicable UL s tandards are unde rgo ing review by UL with regard to updat ing coverage for listing gas vents to be installed in masonry chimneys. The Commit tee therefore agrees that it is p r ema tu re to revise the Code as suggested by the submit ter at this time.

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N F P A 54 - - A 9 6 R O P

(Log #129) 54-161 - (7-6.9 Figure 13): Reject SUBMITTER: Deborah A. Cash, Bock Water Heaters, Inc. RECOMMENDATION:

Ro of Pitctt H ( mi n ) Ft.

Flat to 67q-~ 9/12 - t~ 2.0 &/12 t,:, 7/'12 1.25 ~/12 tc 3/12 1.5

SUBSTANTIATION: Gas Vents which terminate too close to the roof peak are susceptible to downdrafts. We have received several calls from installers who have vented according to NFPA but were experiencing downdraft problems. We r ecommend that they raise the te rmina t ion 2 feet above the minimum, which eliminates the problem. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: There is not adequate technical substantiation to support the proposal.

(Log #76) 54- 162 - (7.6.3 Exception No. 2): Reject Note: This proposal appeared as comment 54-301 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-108. SUBMITTER: Richard L. Stone, Bodega Bay, CA RECOMMENDATION: Reword as follows:

"Exception No. 2: As an alternate me thod for sizing a gas vent connected to more than one draft hood-equipped appliance, the effective area of the gas vent shall be no t less than the combined areas of all connected draft hood outlets."

This is a simplified restatement of NFPA Proposal 54-122 which appeared in the Technical Committee Report. The proposer disagrees with the repor ted Committee Action: "Accept in Prin- ciple" because the major principle here is to use total combined outlet area, rather than 50 percent of the additional areas. The proposer agrees that this me thod should be limited to draft hood- equipped appliances, but the major issue of combined area was actually rejected. SUBSTANTIATION: A. This rule of combined areas is consistent with 7.10.5 b. which applies to appliances having more than one draft hood. There is no logical difference in venting requirements between one appliance with three draft hoods, all operating simultaneously, and three identical draft l lood appliances also operating simultaneously. The proposed total area rule should be adapted to eliminate this inconsistency.

B. The total area rule will result in having adequate venting area regardless of how many appliances are combined. The existing rule of adding 50 percent may cause venting failure if combining too many appliances causes the area to approacli 50 percent of actual requirements.

C. The NFPA 211 committee is in process of adopt ing a total combined area rule with certain limitations.

D. Adoption of the total area rule may lead installers to pay more attention to the Tables, which in most instances will lead to more economical or improved vent selection.

E. Continuation of the 50 percent rule, which may cause venting failure with complicated combined or manifolded systems, poses liability problems for installers and venting product manufacturers.

F. Neither the 50 percent, nor the above proposed 100 percent rule, cover the important aspects of vent connector configuration. Also there is no alternate rule for fan-assisted combustion appliances. The Code would be greatly improved if the alternate rule for two or more draft lmod-equlpped appliances was d ropped completely and the use of Tables was specified for all combined venting systems regardless of material used. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The substantiation, while extensive, does not provide adequate reason for removing the established "fifty- percent rule" from the provision.

(Log #141) 54- 163 - (7.6.3 Exceptions No. 1 and 2): Reject SUBMITTER: Daniel D. Holmes, Long Island Lighting Co. RECOMMENDATION: Remove Exceptions No. 1 and Exception No. 2. SUBSTANTIATION: Part 11 allows for cifimney height and BTU's and is very clear. The exceptions are vague and leave too much to chance when installing equipment. COMMITrEE ACTION: Reject.

COMMITI'EE STATEMENT: There is no t adequate technical substantiation for the proposal.

(Log #78) 54-164 - (7.6.3(a) Exception No. 3 (New)): Reject Note: This proposal appeared as comment 54-304 which was held

for fur ther study f rom ~tie Annual 92 TCD, which was on proposal 54-108. SUBMITTER: TimothyJ. Dwyer, Tjernlund Products Inc. RECOMMENDATION: Add new text as follows:

Exception No. 3: As an alternative me thod for sizing a gas vent connected to no t more than two* Category I appliances employing a listed Mechanical draft system, the effective area of the gas vent shall be sized in accordance with the Mechanical draft system's listing. SUBSTANTIATION: Confusion exists when a Category I appliance is vented by a listed Mechanical Draft System. Like fan-assisted combustion system appliances, the size of the gas vent should be designed differently. The inclusion of this proposed wording would eliminate this confusion.

* A.G.A~ Requirements for Mechanical Venting Systems, No. 6-90, certifies these devices for up to two appliances, (Section 1.1.1 ). COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: The committee agrees that the submitter 's proposal is covered under 7.3.4. See Committee Action on Proposal 54-147 (Log #CP32).

(Log #77) 54- 165 - (7.6.3(a) Exceptions No. 1 and 2): Accept Note: This proposal appeared as comment 54-302 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-108. SUBMITTER: Robert Borgeson, American Gas Assoc Laboratories RECOMMENDATION: Add to exceptions:

No. 1. "... draft hood outlet, nor great, elf than seven times the draft hood outlet area"

No. 2. "... draft hood outlets, nor ~rreater than seven times the smallest draft hood outlet area". SUBSTANTIATION: This makes the exceptions compatible with the notes in Part 11. COMMITTEE ACTION: Accept. COMMITrEE STATEMENT: Refer to Committee Action on Proposal 54-156 (Log #73).

(Log #177) 54-166 - (7.6.~,(a) Exceptions No. 1 and 2): Reject SUBMITTER: Daniel D. Holmes, Long Island-Lighting Co. RECOMMENDATION: Eliminate Exception No. 1 and Exception No. 2 in Section 7.6.3(a). SUBSTANTIATION: Part II allows for chimney height and BTU's and is very clear. The Exceptions are vague and leave too much to chance when installing equipment. COMMITTEE A C ~ ON : Reject. COMMITTEE STATEMENT: There is not adequate technical substantiation for the proposal.

[Refer to 54-163 (Log 141).]

(Log #183) 54-167- (7.6.3(a) Exceptions No. 1 and 2): Accept SUBMITTER: Hall Virgil, Carrier Corp. RECOMMENDATION: Revise 7.6.3 to read:

7.6.3 Size of Gas Vents. [No change] (a) Category I Appliances. [No change] Note [No change ] Exception. No. 1". As an alternate, me thod .°f sizinlg an individual, gas

vent for a single, draft hood-eqmpped apphance, the effectave area of the vent connector and the gas vent shall be not less than the area of the appliance draft hood outlet, por ~rreater than seven times the draft hood oudet area~ Vents serving fan=assisted appliances, shall be sized in accordance with Part 11 or other approved engineering methods.

Exception No. 2: As an alternate me thod for sizing a gas vent connected to more than one draft hood-equipped appliance, the effective area of the vent shall be not less than the area of the largest connector plus 50 percent of the areas of additional draft hood outlets, nor ~ceater than seven times the smallest draft hood oudet are~ Vents serving fan-assisted combustion system appliances, or combinations of fan-assisted combustion system and draft hood- equipped appliances, shall be sized in accordance with Part 11 or other approved engineer ing methods.

838

N F P A 5 4 - - A 9 6 R O P

SUBSTANTIATION: New text is shown as "underline." These revisions would prevent oversizing of gas vents for consis-

tency with Part 11 (page 170, note 9 and page 184, note 14). The GAMA Venting Tables has included this oversizing restriction since 1990 with satisfactory results. COMMITTEE ACTION: Accept.

(Log #122) 54-168 - (7.6.4): Reject SUBMITTER: Russel Iwan, Metropolitan Utilities District RECOMMENDATION: DELETE: 7.6.4 Gas Vents Serving Equipment on More than One Floor. All gas utilization equipment connected to the common vent shall be located in rooms separated from habitable space. Each of these rooms shall have provisions for an adequate supply of combustion, ventilation, and dilution air that is not supplied from habitable space. (See Figure 14). SUBSTANTIATION: After visiting with officials at NFPA, AGA, and Glad, I cannot f ind anyoqe that can come up with the technical data to substantiate this rule. Without an technical justification for this rule, I believe the statement: "Provided the venting system is designed and installed in accordance with approved engineering methods" in sufficient until more research can be done. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The committee agrees that 7,6.4 should be retained as it addresses the separation of appliances from living spaces in multi-story buildings. This is an important safety consideration as blockage of vents can cause spillage into the space containing the appliances.

- (Log #153) 54- 169- (7.7.3(d) and 7.10.6): Accept SUBMrr ' rER: Ted Margraf, Armstrong Air Condit ioning Inc. RECOMMENDATION: 7.7.3(d) and 7.10.6 both refer to Table IX for clearance to combustibles information. SUI~TANTIATION: Correct reference is Table X. COMMITTEE ACTION: Accept.

Revise 7.7.3(d) and 7.10.6 by substituting "Table X" for "Table IX." COMMITTEE STATEMENT: Editorial correction.

(Log #CP34) 54-170 - (7.7.4): Accept SUBMITTER: National Fuel Gas Code Committee, RECOMMENDATION: 7.7.4 (a)* A venting system of a single-wall metal pipe shall be sized ~ d wil~h , , c ~ d in accordance with one avp,,,-,-cd cugLi,.,., L,g of the following methods and the gas equipment manufacturer 's instructions:

1. For a draft hood equipped appliance, in accordance with Part 11.

2. For a venting system for a single annliance with a draft hood. the areas of the contaector and the hide e~dh shall not be less than tlae area of the annliance flue c o l l ~ o'r draft hood oudet, whichever is smaller. The bent area shall not be ~reater than seven times the draft hood outlet area.

3. For a ventin~ system for more than one annliance in a single room. all havin~dm.ft hoods, the area of the 6fne shall not be'less than the area o~the largest connector Dlm 56 t;ercent o f the area of the additional dra£t h o o d outlets. The ~'ent area shall not be Lrreater thall sev¢la th~es the smallest draft hood outlet area.

4. Other anDroved engineer ing methods. {Delete present Exceptions 1-3/" Present (b) and (c) to remain.

SUBSTANTIATION: The paragraph is revised for clarity and to incorporate suggestions made in other proposals. COMMITTEE ACTION: Accept.

(Log #82) 54-171 - (7.7.4 Exception No.3): Accept in Principle in Part Note: This proposal appeared as comment 54-311 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-108. SUBMITTER: Richard L. Stone, Bodega Bay, CA RECOMMENDATION: Revise to limit this to single wall metal pipe vents for draft hood appliances as follows:

"The sizing of single wall metal pipe venting systems for one or more listed appliances equipped with draft hoods shall be permitted to be in accordance with Tables 11-5 and 11-10 of Part 11."

Delete "or Category I anDliances listed for use with T w e B ~as

Delete "in a single room". SUBSTANTIATION: A. The Table references in the Review and Comment Text are wrong. The correct references are to Tables 11-5 for single appliance vents, and 11-10 for two or more appliances.

B. Tables 11-5 and 11-10 apply to draft hood-equipped appliances only, and do not apply to Category I fan-assisted combustion appliances.

C. The phrase "in a single room" should be dele ted as it has nothing to do with sizing. COMMITTEE ACTION: Accept in Principle in Part. Refer to Proposal 54-170 (Log #CP34).

COMMITrEESTATEMENT: The committee has no t deleted "in a single room" because the reminder is needed here as the committee believes that appliances in different pressure zones should not be connected to the same vent. The Code is correct as presently written.

(Log #79) 54-172 - (7.7.4 Exceptions No. 1 and 2): Reject Note: This p roposa lappeared as comment 54-307 which was held

for fur ther study f rom • e Annual 92 TC, D, which was on proposal 54-108. SUBMITTER: Richard L. Stone, Bodega Bay, CA RECOMMENDATION: Add the words "single-wall petal pipe" before "venting system..." in Exception No. 1.

Revise Exception No. 2 to read as follows: Exception No. 2: As an alternate me thod for sizing a single-wall

metal pipe venting system connected to more than one draft-hood equipped appliance, the effective area of the pipe shall be not less than the combined areas of all connected draft hood outlets. SUBSTANTIATION: A. The term "single-wall metal pipe" is needed to clarify the application of these exceptions, and for consistency with Exception No. 3.

B. Similar Exceptions for gas vents and chimneys (7.6.3 and 7.5.3) are res t r iqed to draft hood-equipped appliances.

C. This rule of combined areas is consistent with 7.10.3(b) which applies to appliances having more than one draft hood. There is no logical difference in venting requirements between one appliance with three draft hoods, all operating simultaneously, and three identical draft hood appliances also operating simultaneously. The proposed total area rule should be adapted to eliminate this inconsisteqcy.

D. The total area rule will result in having adequate venting area regardless of how many appliances are combined. The existing rule of adding 50 percent may cause venting failure if combining too many appliances causes the area to approach 50 percent of actual requirements.

E. The NFPA 211 committee is in process of adopt ing a total combined area rule with certain limitations.

F. Adoption of the total area rule may lead installers to pay more attention to the Tables, which in most instances will lead to more economical or improved vent selection.

G. Continuation of the 50 percent rule, which may cause venting failure with complicated combined or manifolded systems, poses liability problems for installers and venting product manufacturers.

H. Neither the 50 percent, nor the above proposed 100 percent rule, cover the important aspects of vent connector configuration. Also there is no alternate rule for fan-assisted combustion appliances. The Code would be gready improved if the alternate rule for two or more draft hood-equipped appliances was d ropped completely, and the use of Tables was specified for all combined venting systems regardless of material used. COMMITrEE ACTION: Reject. COMMYFrEE STATEMENT: Refer to Committee Action on Proposal 54-162 (Log #76).

839

(Log #80) 54-173- (7.7.4 Exceptions No. 1 and 2): Reject Note: This proposal appeared as comment 54-308 whicb was held

for fur ther study from the Annual 92 TGD, which was on proposal 54-108. SUBMITTER: Dave Fetters, Hart & Cooley Inc. RECOMMENDATION: Revise text as follows:

"Exceptions No. 1 and 2: Allow the use of single wall galvanized pipe using an alternate sizing me thod on appliances no t limited to draft hood equipped only." SUBSTANTIATION: The above seems to be inconsistent with previous wording found in 7.5.3 and 7.6.3, Exceptions 1 and 2, where alternate sizing is allowed, but limited to draft hood equipped appliances only. A review of 7.10.3 any also be appropriate.

N F P A 54 - - A 9 6 R O P

COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: No technical substantiat ion is provided to suppor t the proposal.

The altered Exception No. 2, establishes qualification and parameters within safe guide lines. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: The commit tee agrees that the Exception currently applies to listed outdoor appliances.

(Log #81) 54- 174 - (7.7.4 Exceptions No. 1 and 2): Accept in Principle Note: This p roposa l appea red as c o m m e n t 54-309 which was he ld

for fur ther study f rom the Annual 99 TCD, which was on proposal 54-108. SUBMITTER: Robert Borgeson, American Gas Assoc Laboratories RECOMMENDATION: Revise except ions to read:

Exception No. 1: As an al ternate m e t h o d of sizing a vent ing system for a single appliance with a draft h o o d only, the effective area of the connector a n d the pipe shall no t be less than the area of the appliance flue collar or draft hood outlet, no r greater than seven t imes the draft hood oude t area.

Exception No. 2: As an al ternate m e t h o d for sizing a vent ing system connec ted to more than one appliance all haviu~ draft oh29..~ die effective area of die pipe shall be not less dlffn the area of the largest connector plus 50 pe rcen t of the area of addit ional flue collars or draft hood outlets, no r ~reater than seven t imes the

v

smallest draft hood outlet area. SUBSTANTIATION: The exclusion of dais clause to draft hood- equ ipped appl iances was clearly the in ten t of the Vent ing panel. This corrects an omission.

The seven t imes rule makes these exceptions compatible with the notes of Part 11. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: Refer to Proposal 54-170 (Log #CP34).

(Log #182) 54- 175 - (7.7.4(a)): Accept SUBMITTER: Hall Virgil, Carrier Corp. RECOMMENDATION: Revise 7.7.4 to read:

7 7.4 Size of Single-Wall Metal Pipe. (a)* A vent ing system of single-wall metal pipe shall be sized and

constructed in accordance with approved engineer ing me thods and the gas e q u i p m e n t manufac tu re r ' s instructions.

Exception No. 1: As an al ternate m e t h o d of sizing a vent ing system for a single appl iance with a draft hood only, the effective area o f the connector and the pipe shall be no t less than the area of the appl iance flue collar or draft hood outlet, no r m-eater than seven times the draft h o o d outlet area.

Exception No. 2: As an al ternate m e t h o d for sizing a vent ing system connec ted to more than one appliance, all with draft hoods, the effective area of the pipe shall be not less than the area of the largest connector plus 50 percen t of the area of addit ional flue collars or draft hood outlets, no r ~reater than seven t imes the smallest di,xft hood outlet area. SUBSTANTIATION: New text is shown "underl ine."

These revisions would prevent oversizing of single-wall vent ing systems for consistency with Part 11 (page 170, note 9 and page 184, note 14). The GAMA Vent in$ Tables has included this oversizing restriction since 1990 with satxsfactoryfield results. COMMITI'EE ACTION: Accept.

(Log #84) 54- 176 - (7.8 Exception No. 2): Reject Note: This proposal appea red as c o m m e n t 54-313 which was he ld

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-108. SUBMITTER: B. Wayne Jackson, Manufacture of Exact-Air RECOMMENDATION: Revise text as follows:

Exception No. 2: This provision shall no t apply to the separat ion of the circulating air inlet and vent discharge of listed out-door appliances or of listed mechanical vent ing devices which include an integral fresh air inlet, provided the air inlet and ven t discharge of such listed mechanica l vent ing devices are separa ted by no t less than 12 in. SUBSTANTIATION: To delete the r equ i r emen t as draft proposal indicates, with absolutely no qualifying specifics or parameters is f r ighteningl The subject si tuation w o u l d b e relieved f rom any and all jur isdic t ion what-so-ever.

Results: A derelictl Reason for Com men t .

(Log #165) 54- 177- (7.8(a)): Accept SUBMITTER: Wilbur L Haag, Jr., A. O. Smith Water Products Company RECOMMENDATION: Change "vent discharge" to "flue gas discharge." SUBSTANTIATION: Listed outdoor e q u i p m e n t is no t vented, therefore will no t have vent discharge. T h e flue gases are discharged to the ambien t a tmosphere . COMMITrEE ACTION: Accept.

(Log #83) 54- 178- (7.8(c)): Reject Note: This proposal appea red as c o m m e n t 54-312 which was he ld

for fur ther study f rom the Annual 92 TCD, which was on proposal N/A. 0 $UBMITTER: Harry Ihlenfield, GlowCore Corp. RECOMMENDATION: This section should be revised without reference to Btuh input.

Revised wording: "The vent terminal of a direct vent appliance shall te rminate 12 in.

above, 12 in. horizontally (never below) f rom any opening th rough which flue gases could enter a building. The bo t tom of the vent terminal and air intake shall be located 12 in. above grade." SUBSTANTIATION: It is c o m m o n in residential an d commercial buildings to use awning type windows. With vents located below awning type windows and when window is opened, window would form a hood above vent and flue products would en ter building.

There are many direct vent boilers that operate t h rough s u m m e r m o n t h s to provide domest ic ho t water and windows could conceiv- ably be open above vents installed 9 in. or 12 in. below window as figure 15 depicts. As this poses a definite safety hazard, Section 7.8(c) should be reviewed. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: There is no t adequate technical substant iat ion to suppor t the proposal.

(Log #155) 54- 179 - (7.8(c)): Accept in Principle SUBMITTER: J o h n Quick, Hun te r Enterprises RECOMMENDATION: (c) Tile vent terminal of a direct vent appliance with an inpu t of 10,000 Btu per hr (3 Kw) or less shall be located at least 6 in. (150 ram) f rom any open ing th rough which flue gases could enter a building, and such an appliance with an inpu t over 10,000 Btu per h r (3 Kw) but no t over 50,000 Btu per hr (14.7 Kw) shall require a 9 in. (23 cm) vent te rminat ion clearance an d an appliance with an inpu t over (50,000 Btu per h r (14.7 Kw) shall require a 12 in. (30 cm) vent te rminat ion clearance. The bot tom of the vent terminal a n d the air intake shall be located at least 12 in. (30 cm) above grade. SUBSTANTIATION: In August of 1994 Hun te r Enterprises received certification of the gas baseboard heater model HB5000 u n d e r certificate T2050008. Since this t ime many inquiries have been made regarding the heaters suitability as a rep lacement for electric baseboards located u n d e r windows with less than 9 in. clearance for the exhaust . As you can well imagine there are thousands of potential installations of dais type which cannot be comple ted without revising the NFPA 54 and ANSI Z223.1 standard.

In Augus t o f this year (1994) the Canadian Gas Research Institute conduc ted a study of baseboard combust ion levels which may enter the h o m e f rom an exhaus t located 6 in. f rom an open window or door. The results of this study are summar ized in a repor t p repared by Mr. Haigo Tikiryan. Al though the p resen t baseboard has an inpu t of 5800 Btuh it is

Hun te r ' s in tent ion to develop a family of baseboards having various lengths and inputs which may reach 10,000 Btuh. We feel that the results of the testing by CGRI confirm tha t at this level of inpu t the dispersion of combust ion products will be such that they will no t be hazardous to h u m a n health.

840

- - 7

N F P A 54 - - A 9 6 R O P

NOTE: Suppor t ing material is available for review at Amer ican Gas Association and NFPA Headquarters . COMMITTEE ACTION: Accept in Princil~le.

The commit tee agrees with the submit ter s proposal and revised proposal to state:

7.8(c) The ven t tertxfiual of a direct vent appliance with an inpu t of 10,000 Btu per h r (3 Kw) or less shall be located at least 6 in. (150 ram) from any air open ing into a building, and such an appliance with an inpu t over 10,000 Btu per h r (3 Kw) but no t over 50,000 Btu per h r (14.7 Kw) shall be installed with a 9 in. (23 cm) vent te rminat ion clearance :rod an appl iance with an inpu t over (50,000 Btu per h r (14.7 Kw) shall be at least a 12 in. (30 cm) vent termina- t ion clearance. The bot tom of the vent terminal and the air intake shall be located at least 12 in. (30 cm) above grade. COMMITTEE STATEMENT: Accept with editorial modifications.

(Log #164) 54- 180 - (7.10.2 and 7o10.6): Accept SUBMITTER: Wilbur L. Haag, Jr., A. O. Smith Water Products Company RECOMMENDATION" Revise text as follows:

(b) 2 Table X should be Xl (c) Table X should be XI (d) Table XI shou ld be Xll (e) Table IX should be X

SUBSTANTIATION: Errata These were no t r e n u m b e r e d when the new Table IX was pu t in the

1992 edition. COMMriFrEE ACTION: Accept. COMMY[TEE STATEMENT: Editorial correction.

(Log #85) 54- 181 - (7.10.2(b)): Accept in Principle Note: This proposal appea red as c o m m e n t 54-318 which was held

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: Ted Zanias, Amer ican Metal Products Div of Masc . RECOMMENDATION: Change m i n i m u m thicknesses to .018 in. for galvanized steel and to .027 in, for a l u m i n u m instead of .012 in. SUBSTANTIATION: Over t ime, the repeated downward interpreta- tions of gage tolerances has led us to too th ink and weak vent connec to r s . . 012 in. a l u m i n u m pipe can easily be c rushed between two fingers unless it is re inforced or enclosed inside ano the r pipe such as Type B. Also, refer to recent action on this mat ter by NFPA 211. COMMITrEE ACTION: Accept in Principle. COMMITrEE STATEMENT: Refer to Commi t tee Action on Proposal 54-182 (Log #86).

(Log #86) 54- 182 - (7.10.2(b).2): Accept in Principle Note: This proposal appea red as c o m m e n t 54-319 which was he ld

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: Richard L. Stone, Bodega Bay, GA RECOMMENDATION: Revise (b).2 as follows:

'Went connectors for listed gas appliances and for appliances having draft hoods and equ ipped with listed conversion burners , which are no t installed in attics shall be of Type B or Type L vent material or smoo th interior wall metal pipe having resistance to hea t and corrosion equivalent to that of galvanized (G60 m i n i m u m ) shee t steel no t less than 0.018 in. (0.46 m m ) thick, a l u m i n u m (1100 or 3003 alloy or equivalent) shee t no t less than 0.027 in. (0.069 mm) thick or stainless steel shee t no t less than 0.012 in. (0.31 ram) thick." SUBSTANTIATION: Cont inua t ion of the less than adequate thicknesses of 0.012 in. for galvanized a n d a l u m i n u m shee t conflicts within the Fuel Gas Code and also conflicts with thickness mini- m u m s proposed in the Commit tee Report for NFPA 211 by the Commit tee on Chimneys, Fireplaces a n d Vendng Systems for Heat Producing Appliances. Single wall metal materials for connectors should be more accurately described as to alloy, and need to be more durable consider ing problems with wetfime caused by fan- assisted combust ion appliances. The following specific i tems of substant iat ion are proposed:

A. The wording in the Review and C o m m e n t text does not cover fan-assisted appliances. The proposed wording will e l iminate this deficiency b~¢ de ledng rite first reference to draft hoods in the first sentence of 7.10.2 b. 2.

B. With the inclusion o f connec tor material for fan-assisted combust ion appliances, it should be recognized tha t these appliances cause longer wettimes, and more corrosion. This calls for

eater connector durability. A l u m i n u m connector material of 12 in. thickness, especially ff it is some unspecif ied soft, low grade

alloy, will no t hold up well and may be very flimsy. It is recom- m e n d e d tha t a l u m i n u m connector materials conform to the alloy choices for the inne r a l u m i n u m wall of Type B double-wail gas vent; 1100,3003 or equivalent as required by UL Standard 441.

C. The present wording is serf-contradictory as 0.012 in. thick a l u m i n u m is no t equivalent in s t rength to 0.012 in. thick galvanized. For equivalent s trength, a l u m i n u m shee t of suitably corrosion resistant grades shou ld be at least 50 percent thicker than galvanized shee t steel.

D. The Code is very inconsis tent regard ing metal thickness for various applications. For 5 in. d iameter or smaller single wall p iping there are three choices:

0.012 in. for gas ven t connectors 0.019 in. for low-heat appliances 0.0304 in. for single wall metal pipe vents The thickness m i n i m u m s of 0.018 in. for galvanized steel an d 0.012

in. stainless steel are those in UL Standards for outer casings of gas ven t a n d ch imney (UL-441 a n d UL-103).

The proposal for 0.027 in. thick a l u m i n u m is to obtain s t rength equivalent to that of 0.018 in. thick galvanized steel.

E. The wording "smooth interior wall" is needed to assure tha t the capacity tables apply in regard to hea t loss and pressure drop. Use of flex corrugated connector material is no t covered by the tables especially for fan-assisted combus t ion appliances. COMM][TFEE ACTION: Accept in Principle.

Revise as follows: 7.10.2(b) 2 Vent connectors for listed gas appliances having draft

hoods and for appliances having draft hoods and equ ipped with listed conversion burners , which are no t installed in attics shall be one of dae following:

a. Type B or Type~L vent material or ~mood, ;i,;;., ;o; ,,,d] b. Galvanized shee t steel no t less than 0.018 in. (0.46 mm) thick;

or c. A l u m i n u m (1100 or 3003 alloy or equivalent) sheet no t less than

0.027 in. (0.069 ram) thick; or d. Stainless steel shee t no t less than 0.012 in. (0.31 mm) thick; or e. Smooth interior wall metal pipe having resistance to heat an d

corrosion equivalent to tha t of b, c, or d above; or f. A listed vent connector .

COMMITFEE STATEMENT: The G60 m i n i m u m thickness for galvanized steel is no t accepted because no substant iat ion is provided to qualify the specification. The commit tee no ted that the revised thicknesses correlate with the requ i rements in NFPA 211.

(Log #87) 54- 183- (7.10.2(b).2): Accept in Principle Note: This proposal appea red as c o m m e n t 54-320 which was he ld

for fu r ther study f rom the Annual 92 TCD, which was on proposal 54-16. $UBMITTER: Dave Fetters, Hart & Cooley Inc. RECOMMENDATION: Revise text as follows:

"2. Appliances Not Installed in Attics: Unlis ted vent connectors ... no t less than tha t of galvanized shee t steel no t less than 0.018 in. thick, or a l u m i n u m no t less than 0.0122 0.027 in. thick, or stainless steel no t less than 0.012 in. fl~ick." SUBSTANTIATION: Wording would be ha rmonized with NFPA TCR proposal 211-64. Galvanized shee t should have a m i n i m u m thickness; .012 a l u m i n u m without fur ther protect ion like the outer wall of B-Vent is too soft and subject to damage if hit or pushed; .012 stainless is s t rong e n o u g h and has sufficient hea t a n d corrosion resistance to be included. The word "unlisted" should be added since there are listed vent connectors. COMMITFEE ACTION: Accept in Principle. COMMITrEE STATEMENT: Refer to Commit tee Action on Proposal 54-182 (Log #86).

(Log #88) 54- 184- (7 .10 .2(b) .2) : Reject Note: This proposal appea red as c o m m e n t 54-321 which was he ld

for fu r ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: JohnJackl ich , Simpson Dura-Vent RECOMMENDATION- Change paragraph to read:

"... or metal pipe having resistance to heat and corrosion no t less than tha t of galvanized shee t steel 0.0157 in. thick with a galvanized coating no t less than G90, or a l u m i n u m not less than 0.012 in. thick."

B41

N F P A 54 m A 9 6 R O P

SUBSTANTIATION: Field reports indicate significant corrosion problems with single-wail galvanized connectors. It is noted that metallurgical data confirms that the corrosion resistance of galvanized materials is proport ional to the thickness of the "sacrifi- cial" galvanized coating. At present the National Fuel Gas Code does not state a requirement for the thickness of the galvanized coating on signle-wall galvanized steel connectors. ICBO, BOCA, and SBCCI also do not require a specific coating thickness. While the building codes specify 28gage overall material thickness, the National Fuel Gas Code specifies a minimum wall thickness only for "combination oil/gas connectors."

Due to highly competitive, commodity pricing by regional and local manufacturers of galvanized vent connectors, combined with the fact that these products are not U.L. Listed (and therefore are not subject to the U. L, quality assurance inspections), a significant percentage of the product on the market is manufactured from the lower cost G40 or G60 matedal (as compared to G90 for Type B gas vent), with 30 gage being the most common material thickness.

Coating Soec. GMvanized Coating Thickne~ G90 .0006" Gt0 .0004" G40 .0003"

Material Ga~e MateriMThickne~ 26 Gage .0187"-.0247"(.0217) 28 Gage .0157"-.0217"(.0187) 30 Gage .0127-.0187"(.0157)

Insertion from front: State a requirement for the thickness of the galvanized coating on single-wall galvanized steel connectors. ICBO, BOCAM and SBCCI also do not require a specific coating thickness. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-182 (Log #86).

(Log #168) 54- 186- (7.10.6): Accept SUBMITI'ER: Paul A. Cama, Long Island Lighting Company RECOMMENDATION: Revise Section 7.10.6 to reference Table X. Current edition references Table IX by mistake. SUBSTANTIATION: Incorrect table reference. COMMITYEE ACTION: Accept.

(Log #90) 54-187- (7.10.10(b)): Accept Note: This proposal appeared as comment 54-334 which was held

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: Richard L. Stone, Bodega Bay, CA RECOMMENDATION: Present wording allowing length equal to 75 percent of height implies that this is always correct and acceptable. This is totally in conflict with the Tables for draft h o o d appliances. Revise to read:

"When so indicated by the applicable Tables in Section 11, the horizontal length of vent connector to a natural draft chimney or vent serving a single draft hood-equipped appliance shall be permit ted to be 75 percent or more of the height of the vertical

g ortion of the chimney or vent above the vent connector." UBSTANTIATION: For many combinations of input and height,

the permissible length of connector is much less than 75 percent of the height. With a single wall vent connector (Lateral) serving a Type B gas vent, Table 11-2, the NAT Max column for 4 in. size shows that with 80,000 Btuh input at 10 ft of height, permit ted lateral is only 2 ft. With a 75 percent lateral, capacity would be only 72,m000 or not enough. The proposed wording preserves the 75 percent idea while giving

precedence to proper use of Section 11. Also the proposed wording eliminates the need for the Exception. COMMITYEE ACTION: Accept.

(Log #89) 54-185 - (7.10.3(b) and (d)): Reject Note: This proposal appeared as comment 54-326 which was held

for fur ther study f rom the Annual 92 TCD, which was on proposal 54-16. SUBMITTER: Richard L. Stone, Bodega Bay, CA RECOMMENDATION: Revise last two sentences of (d) to be consistent with (b) in regard to connector manifold area to read:

"As an al temate me thod for sizing aven t connector manifold and its junc t ion fittings for more than one draft hood-equipped appliance the effective area of the manifold and the junct ion fittings shall be not less than the combined areas of all the connected draft hood outlets." SUBSTANTIATION: A. This rule of combined areas is consistent with 7.10.3(b) which applies to appliances having more than one draft hood. There is no logical difference in venting requirements between one appliance with three draft hoods, all operating simultaneously, and three identical draft hood appliances also operating simultaneously. The proposed total area rule should be adapted to eliminate this inconsistency.

B. The total area rule will result in having adequate venting area regardless of how many appliances are combined. The exisdng rule of adding 50. percent may cause venting failure if combining too many appliances causes the area to approach 50 percent of actual requirements.

C. The NFPA 211 committee is in process of adopt ing a total combined area rule with certain limitations.

D. Adoption of the total area rule may lead installers to pay more attention to the Tables, which in most instances will lead to more economical or improved vent selection.

E. Continuation of the 50 percent rule, which may cause venting failure with complicated combined or manifolded systems, poses liability problems for installers and venting product manufacturers.

F. Neither the 50 percent, nor the above proposed 100 percent rule, cover the important aspects of vent connector configuration. Also, there is no alternate rule for fan-assisted combustion appliances. The Code would be gready improved if the alternate rule for two or more draft hood-equipped app.liances was dropLp,ed completely, and the use of Tables was specified for all combined venting systems regardless of material used. COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: There is no t adequate technical substantiation for the proposal.

The Committee invites interested parties to submit fur ther substantiation related to the proposal.

(Log #173) 54- 188 - (Figure A.7.12.4): Reject SUBM~TTEI~ Robert G. Meyers, Long l s l and Lighting Co. RECOMMENDATION: Add some technical rationale for why some illustrations are correct as opposed to why others are incorrect. SUBSTANTIATION: A cryptic rule without some rationale can be very confusing. COMMITTEE ACTION: Reject. COMMITYEE STATEMENT: The figure shows examples of correct configurations to prevent backdraft into the appliance.

(Log #92) 54- 189 - (7.13): Reject Note: This proposal appeared as comment 54-352 which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-108. SUBMrVI]ER: Ted Zanias, American Metal Products Div of Masco RECOMMENDATION: Delete last sentence concerning fixed baffles. SUBSTANTIATION: Fixed baffles are apparendy prohibi ted in Section 7.15. COMMITYEE ACTION: Reject. COMMITTEE STATEMENT: The committee agrees that the last sentence in 7.13 i sno t affected by 7.15.

(Log #192) 54- 190 - (7.15 Note): Reject SUBMITI~R: Robert G. Meyers, Long Island Lighting Co. RECOMMENDATION: a) Revise items in 1 (b) above to permit tables in Part 11 to be per t inent to systems where vent dampers are used.

b) If this is not possible, revise tables in Part 11 to accommodate the use of vent dampers. SUBSTANTIATION: a) At first glance, it appears that 7.15 is a typographical error. But Note 1 to tables for single and multiple appliances, i.e. ai{ tables, are consistenL This therefore means that no tables can be used where vent dampers are installed, which is 75 percent of the cases.

b) This is a direct contradiction ofASHRAE p. 31.2, Vent Sizes. COMMITrEE ACTION: Reject.

842

N F P A 5 4 - - A 9 6 R O P

COMMI'VITEE STATEMENT: The committee would like to provide guidance regarding the use of Tables in Part 11, but can f ind no technical basis to d-o so. The researchers who have developed the tables have advised the committee that vent dampers were no t anticipated when the research was conducted and therefore cannot r ecommend any method to use the tables when vent dampers are installed. The manufacturers of vent dampers are free to-follow the ASHRAE Equipment Handbook, Chapter 31.2, Chimney Gas Vent and Fireplace Systems, to develop vent sizing guidelines for specific equipment using the "Vent II" software or other methods. -

the definition of Wen t Damper Device, Automatic" would inappro- priatelyresult in deleting th~def 'mition. The committee also considers it inappropriate for the Code to reference pa tented devices as suggested by the submitter in Proposal 54-193 (Log #204) to modify S e ~ o n 7.15.

The proposal contains no substantiation to explain why Exception No. 1 ~s not applicable to the types of devices covered by the proposal.


for fur ther s~ud)~ from i_fie Annual 92 TCD, which was on proposal 54-108. SUBMITTER: Dave Fetters, Hart & Cooley Inc. RECOMMENDATION: Should this be r enumbered as 7.15?

Should Exception No. 2 be limited to draft hood equipped appliances only? SUBSTANTIATION: The use of heat reclaimers or vent dampers on a connector serving a fan-assisted combustion Category I appliance may not work. COMMITI'EE ACTION: R~ject. COMMITTEE STATEMENT: The committee agrees there is no specific proposal or substantiation.

( Log #140) 54-194 - (8.6): Accept in Principle SUBMITTER: Melvin W. Schroeder, Bridgewater, N.J. RECOMMENDATION: Add to present 8.6 the following:

"See Appendix H, steps 7, 8, 10, 11, 12, 13 and 14 for detailed procedures." SUBSTANTIATION: Following 8.6 as presently written will not reveal whether the gas appliances are venting properly. It is necessary to follow the above steps in order (o make a proper draft check. COMMITTEE ACTION: Accept in Principle. Add a new A.8.6: "A procedure for checking draft can be found in Appendix H, steps

7, 8 and 10-14." COMMITTEE STATEMENT: The reference to Appendix H is provided in Appendix A which is appropriate for a reference to non- mandatory material.

(Log #91) 54- 192 - (7.15 Exception No. 3): Accept in Principle Note: This proposal appeared as comment 54-34~ which was held

for fur ther study from the Annual 92 TCD, which was on proposal 54-108. SUBMITTER= Hall Virgil, Carrier Corp. RECOMMENDATION: Insert "the appliance manufacturer approves of installation of such a device in the appliance venting vsuBt em and."

STANTIATION: Such devices can be detrimental to the eration of the appliance and the venting system. MMITI'EE ACTION: Accept in Principle.

Revise 7.15, Exception No. 3 to read:"..., provided the ~as utilization eau inment manufac turer ' s instructions cover the itastallation of such a'de'vice in the ventin~ system and performance in accordance with 7.3.1 and 7.3.2 is obtm~n6d. "

(Note- insert above proposed text between the words, "provided" and "performance" it] 7.I5 Exception No. 3) COMMITrEE STATEMENT: The gas utilization equipment manufacturer 's instructions must be considered when mstalling these devices.

(Log #204) 54- 193 - (7.5 Exception No. 4 (New)): Reject SUBMITTER: J. c . Cosgrove, Total Energy Concep.ts RECOMMEND-ATION: Excention No. 4: Patente~l exnansive draft re,relators (1 /which control d[raft in both on and off c~;cles by re~]irecting draft throu~rh chamber with cross sectional area lar~er than that 6ff lue in whi?h it is installed and (21 installed in stric~ accordance to manufacturers specification. SUBSTANTIATION: Energy 8aver/Fuelbuster has been called a restrictive device simply because of construction which inserts a redirector plate into device. As claimed in four patents, devices are actually expansive not restrictive due to fact tha t they at no time reduce the cross sectional area of flue system. Draft control is automatically achieved by directing flue gases through adjacent chamber with larger cross sectional area which reduces effective draft forces prior to returning to original flue system.

In the past, nearly 100,000 siach devices have been successfully installed and are achieving bod~ energy savings and proport ional emissions reductions. ] 'he energy saver r is installed according to manufacturers specification by cjualified contractors who are required to verify drafting conditions both before and after installation in order to assure safe and proper operation of covered a liance. P . . . . . .

PA~t~lough many uttllOes and government agenoes are satisfied vath CGA Ce?tification presently e~st ing and ha,¢e no objections to installation of energy Saver/Fuelbuster units accord ingto manufacturers instructions, others however as policy require AGA Certifica- tion. COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: The Committee reviewed this

roposal in conjunction with Proposals on 54-16 (Log #203) and 54- (Log #205). The submitter 's proposed modification for the

definiuon of a "Draft Regulator"llas not changed the requirement for automatically reducing the draft and the submitter 's proposal for

(Log #94) 54- 195 - (8.12 Exception): Reject Note: This proposal appeared as comment 54-365 which was held

for fur ther s tudyfrom ilie Annual 99 TCD, which was on proposal 54-136. SUBMITTER: Jeffrey D. Hilleary, Denver Bldg. Dept. Engineering RECOMMEND-ATION: Delete the Exception. SUBSTANTIATION: Why should authority having jurisdiction perrait otherwise?. . Altitude. effects are consmtent no matter where the appliance ts located m the country. COMMIT17EE ACTION: Reiect. COMMITI'EE STATEMENT: The current I~rovisionpermits the autho.rity having jurisdiction to make excepoons based on their experience.


for fur ther stud)~ from ~i-e Annual 92 TCD, which was on proposal 54-137. SUBMITTER: James M. J_agers, Rapid Engineering Inc. RECOMMENDATION: T h e intent of this section]s quest ioned by this reviewer. There is nothing that requires the inspecting agency to make the appliance safe if i~is not. The agency n e e d on]y inspect prior to the modification. The appendices assume that the a- ppliance has been operating safely but don ' t specifically restrict modification f l i t has not been. SUBSTANTIATION: None. COMMITYEE ACTION: Reject. COMMITI'EE STATEMENT: No proposal or substantiation is provided.

(Log #96) 54-197 - (9.3): Reject Note: This proposal appeared as comment 54-368 which was held

for fur ther study from t i e Annual 92 TCD, which was on proposal N/A~ SUBMITTER: James M.Jagers, Rapid Engineering Inc. RECOMMENDATION: T h e modification of the appliance must also be done within the terms of the appliances listing not just the vent dampers listing. SUBSTANTIATION: None. COMMITTEE ACTION: Reject. COMMI'VrEE STATEMENT: No proposal or substantiation is provided.

843

N F P A 54 - - A 9 6 R O P

(Log #148) 54-198 - (9.3): Accept SUBMITTER: Dirk N. Granberg, PV1 Industries, Inc. RECOMMENDATION: Delete the phrase "on an existing appliance installation" in favor of "in a vent serving an existing appliance". SUBSTANTIATION: Many people still confuse the terms vent and flue. Vent damper s listed for installation in existing vents are in tended to reduce the buoyant flow of conditioned room air to the outside, no t to reduce tile buoyant flow of hea ted air f rom an appliance flue outlet to the outside.

ff a d a m p e r device is used to block the flue outlet of an appliance to help reduce s tandby losses, it mus t be certified as part of the appl iance by a safety certification and listing agency. COMMITTEE ACTION: Accept.

(Log #213) 54-199 - (Part 10 - Sizing Tables): Accept in Principle in Part SUBMITTEI~ James ~ Ranfone, Amer ican Gas Association RECOMMENDATION: Add three, 2-pound copper tube sizing tables as follows: SUBSTANTIATION: To provide guidance for the sizing of 2-psig gas distr ibution systems utilizing copper tubing. Two p o u n d systems are being increasingly utilized as a means to provide a cus tomer with a economical gas distr ibution method . The proposed tables are based on existing regulator manufac tu re r sizing tables. COMMITTEE ACTION: Accept in Principle in Part.

Add the p roposed table 10-14, and add the proposed table 10-15 and n u m b e r 10-5. R e n u m b e r the existing tables.

Delete the head ing "Use this table when m a x i m u m total Ioad...CFH" on the 3 tables.

Revise the head ing of 1045 to: M a x i m u m Capacity of Pipe in Cubic Feet of Gas per Hour for Gas

Pressures of 0 .5ps i or of Less and a Pressure Drop of 1.0 Water Column. C O M M I T r E E STATEMENT: The proposed tables are accepted and the tides changed for consistency. Proposed Table 10-13 is no t accepted as a similar table in Proposal 54-200 (Log #228) is preferred as the pressure drop of 1.0 psi is consistent with the r emainder of the chapter.

Table 10-13 Si~ag Table for 2 PSIG Pressure Tubing Cal~acity of Tubing of Different Diameters and Lengths in Cubic Feet Per Hour (CFH) for a 35 in. Water Column Pressllre Drop and a Gas of 0.6 Specific Gravity From Point of Delivery to Line Regulator

Use this table when maximum total load supplied by single house line regulator is less than or equal to 150 CFH

Diameter: Inside (Outside) Length 1/4 in. 3 /8 in. 1/2 in. 5 /8 in. 3 /4 in. 1 in. 1 1 /4 in .

Feet (0.315in.) (0.430in.) (0.545in.) (0.666in.) (0.785in.) (1.025in.) (1.265in.)

10 296 670 1248 2119 3249 6540 11357 15 238 538 1002 1702 2609 5252 9120 20 204 460 857 1456 2233 4496 7806 30 163 370 689 1170 1793 3610 6268 40 140 316 589 1001 1535 3090 5365 50 124 280 522 387 1360 2738 4755 60 112 254 473 804 1232 2481 4308 70 103 234 435 740 1134 2282 3963 80 96 218 405 688 1055 2123 3687 90 90 264 380 646 990 1992 3460 100 85 193 369 610 935 1882 3268 125 76 171 318 540 828 1668 2896 150 68 155 288 490 751 1511 2624 175 63 142 265 450 691 1390 2414 200 59 132 247 419 642 1293 2246 250 52 l l 7 219 371 569 1146 1991 300 47 106 198 337 516 1039 1804

Table 10-14 Siting Table for 2 PSIG Pres~are Tubing Capacity of Tubing of Different Diameters and l eng ths in Cubic Feet Per in. Water Column Pressure Drop and a Gm of 0.6 Specific Gravity from Point of Delivery to Line Regulator

Use this table when maximum total load supplied by single house line regulator is between 151 - 275 CFH

Hour (CFH) a 17

Diamemr: Inside (Ou~ide) Length 1/4 in. 3 /8 in. 1 /2 in. 5 /8 in. 3 /4 in. 1 in. 1 1/4 in.

Feet (0.315 in.) (0.430 in.) (0.545 in.) (0.666 in.) (0.785 in.) (1.025 in.) (1.265 in.)

10 201 454 845 1435 2200 4428 7690 15 161 364 678 1152 1766 3556 6175 20 138 312 581 986 1512 3044 5285 30 111 250 466 792 1214 2444 4244 40 95 214 399 678 1039 2092 3632 50 84 190 354 601 921 1854 3219 60 76 172 320 544 834 1680 2917 70 70 158 295 501 768 1545 2684 80 65 147 274 466 714 1438 2496 90 61 139 257 437 670 1349 2342 100 58 131 243 413 633 1274 2213 125 51 116 215 366 561 1129 1961 150 46 105 195 332 508 1023 1777 175 43 96 180 305 468 941 1635 200 40 90 167 284 435 876 1521 250 35 80 148 251 386 776 1348 300 32 72 134 228 349 703 1121

(See following 2 pages for r emainder of proposed tables to Log #213.)

844

N F P A 54 - - A 9 6 R O P

Table 10-15 Sizing Table for 2 PSIG Pressure Tubing Capacity of Tubing of Different Diameters and Lengths in Cubic Feet Per Hour with a I in. Water Column Pressure Drop and a Gas of 0.6 Specific Gravity

Use this table to size tubing from house line regulator to the appliance

Diameter: Inside (Outside) Length 1/4in. 3/8in. 1/2in. 5/8in. 3/4in. 1 in. 1 1/4in.

Feet (0.315in.) (0.430in.) (0.545in.) (0.666in.) (0.785in.) (1.025in.) (1.265in.)

10 42 95 177 300 461 928 1612 15 34 76 142 241 370 745 1294 20 29 65 122 296 317 638 1108 30 23 52 98 165 255 512 890 40 20 45 84 142 218 439 761 50 18 40 74 125 193 389 675 60 16 36 67 114 175 352 611 70 15 33 62 105 161 324 563 80 14 31 57 97 150 301 523 90 13 29 54 91 140 283 491 100 12 27 51 86 133 267 464 125 11 24 45 76 118 237 411 150 1O 22 41 69 107 215 372 175 9 20 38 64 98 197 343 200 8 19 35 59 91 184 319 250 7 17 31 53 81 163 283 300 7 15 28 48 73 147 256

Sizing Chart for 2 PSIG Pressure Tubing (from gas meter to house line Maxitrol 325-3 regulator)

Use this table when maximum total load supplied by single house line regulator is less than or equal to 150 CTH

COPPER TUBING CHART

Nominal I.D. Size Tubing 1/4 in. 3 / 8 in. 1/2 in. 5 /8 in. 3 /4 in. ' 1 in. 1 1 /4 in. 1 1/2 in. 2 in. 2 1/2 in. Length 0.315 0.430 0.545 0.666 0.785 1.025 1.265 1.505 1.985 2.465 in Feet I.D. I.D. I.D. I.D. I.D. I.D. I.D. I.D. I.D. I.D.

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CFH at 35 in. W.C. drop (2 PSIG to 21 in. W.C.)

845

N F P A 5 4 - - A 9 6 R O P

Sizing Chart for 2 PSIG Pressure Tubing (from gas me te r to house line Maxitrol 325-3 regulator)

Use this table when m a x i m u m total load supplied by single house l ine regulator is between 151 - 275 CFH

COPPER TUBING CHART

Tubing Length in Feet

10 15 20 30 40

50 60 70 80

90 100 125 150

175 200 250 300

1 / 4 in. 0.315 I.D.

201 161 138 111 95

84 76 70 65

61 58 51 46

3 / 8 in. 0.430 I.D.

::i i!ii!i!ii~liii !!i!i!i iiiii{iiiiiiilN~iiiiiiiiiiiiii

2 5 0 214

190 172 158 147

138 131 116 105

Nomina l I.D. Tubin Size 1 /2 in. 5 / 8 in. 3 / 4 in. 2 1 /2 in. 0.545 0.666 0.785 2.465 I.D. I.D. I.D. I.D.

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43 40 35 32

96 90 80 72

180 167 148 134

1 in. 1 1 / 4 in. 1 1 /2 in. 2 in. 1.025 1.265 1.505 1.985 I.D. I.D. I.D. I.D.

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Tub ing LengO~ in Feet

10 15 20 30 40

CFH at 35 in. W.C. drop (2 PSIG to 21 in. W.C.)

Sizing Char t for Low Pressure ( f rom house l lne Maxi t rol 325-3 regu la to r to app l iance)

COPPER TUBING CHART

Nomina l I.D. Tub in Size 1 /4 in. 3/8 in. 1 / 2 in. 5 / 8 ln. 3 / 4 in. 1 in. 0.315 0.430 0.545 0.666 0.785 1.025 I.D. I.D. I.D. I.D. I.D, I.D,

1 1 /4 in. 1.265 I.D.

42 95 177 iiiii!!!iii~ !.i ii.i.i. 34 76 142 241 29 65 122 206 23 52 98 165 2O 45 84 I42

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2~8 :~{iii{{ii!{i~ii¢~iliiii!{ iii{i{#!{ig~!!iiii{i{:.i~

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90 13 29 54 9 l 100 12 27 51 86 125 11 24 45 76 150

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175 9 20 38 64 200 8 19 35 59 250 7 17 31 53 300 7 15 28 48

98 197 i::iii::i:, i::ii~$ :! i ! :i [ 91 184 iiil;ii::ii!~i6i~

73 147 256

CFH at 1 in. W.C. Drop

846

N F P A 5 4 - - A 9 6 R O P

(Log #228) 54- 200 - (Part 10 Sizing Tables): Accept SUBMITTER: Robert Torbin, Foster-Miller, Inc. RECOMMENDATION: Add two new pipe sizing tables for copper tubing for systems operated at 2 psi and 5psi. Add/replace two current tables for steel pipe operating at 2 psi and 5 psi with revised tables with higher pressure drop. SUBSTANTIATION: The current pipe sizing tables in Part 10 are very conservative in terms of the allowable pressure drops associated with operation at elevated pressures. However, long experience with residential and commercial copper tubing systems (using both natural and LP gas) at 2 PSI indicates that the use of higher pressure drops do not jeopardize the safe operation of the piping system. In fact, the argument could be made that smaller size pipe (that results from using higher pressure drop) for any given load is preferable because it makes the pipe easier to join, support and protect. Smaller size piping up to and including 4 ihch, can be mechanically joined rather than requiring field welding. Current 2 PSI and 5 PSI sizing tables for CSST allow pressure drops of 1.5 and 3.5 PSI, respectively. The proposed change wouldbring consistency to the sizing tables for steel pipe, copper tubing and CSST; recognize the advantages of using higher pressure drops; and offer the design community additional options for sizing and selecting piping for fuel gas systems.

The tables, as submitted, were developed based on extrapolation of existing model code (BOCA and NFGC) data. Foster-Miller intends to conduct a series of laboratory tests to validate the submitted data. Therefore, the submitted data maybe subject to minor changes, pending the outcome of dais testing.

COMMITTEE ACTION: Accept. 1. Accept the proposed table, Maximum Capacity of Senti-Rigid

Tubing in Cubic Feet of Gas per Hour for a Gas Pressure of 2.0 psig or Less and a Pressure Drop of 1.0 psig and number Table 10-13.

2. Accept the proposed table, Maximum Capacity of Semi-Rigid Tubing in Cubic Feet of Gas per Hour for a Gas Pressure of 5.0 psig or Less and a Pressure Drop of 3.5 psig and number 10-14 to follow the table added in Proposal 54- (Log #194). Renumber other tables as appropriate.

3. Accept the proposed table, Pipe Sizing Table ro 2 psig Pressure Capacity of pipes of Different Diameters and Length in Cubic Feet

er Hour for an Initial Pressure of 2.0 psig with a 1.0 psig Pressure rop.., and number Table 10-9. Renumber other tables as appropri-

ate. 4. Accept the proposed table, Pipe Sizing Table ro 2 psig Pressure

Capacity of pipes of Different Diameters and Length in Cubic Feet per Hour for an Initial Pressure ofS.0 psig with a 3.5 psig Pressure Drop... and number 10-10. Renumber other tables as appropriate.

Table 10-x Pipe Sizing Table for 2 psig Pressa~re Capacity of Pipes of Different Diameters and Lengths in Cubic Feet per Hour for an Initial Pressure of 2.0 psig with a 1.0 psig Pressure Drop and a Gas of 0.6 Specific Gravity

Pipe Size of Schedule

40 Standard Internal Pipe I Diameter

1/2 i .622 3 /4 i .824 1 1.049 1 1 /4 1.380 1 1 / ~ 1.610

2 1/2 2.469 3.068

10 I 20 I 30 I 4O I 50 I 60 I 70 I 80 I 90 I 100 I 125 I 150 I 175 I 200

Table 10-x Pipe Sizing Table for 5 psig Pressure Capacity of Pipes of Different Diameters and Lengths in Cubic Feet per Hour for an Initial

Pipe Size of Schedule 40

Standard Internal Pipe Diameter

(Inches) (Inches)

1/2 .622 3/4 .824 1 1.049 1 1 /4 1.~80 1 1/2 1.610 2 2.067 2 1/2 2.469 $ $.068 4 4.096

Pressure of 5.0 psig with a 3.5 psig Pressure Drop and a Gas of 0.6 Specific Gravity

Total Equivalent Length of Pipe in Feet

10 I 20 I $0 I 40 I 50 I 60 I 70 I 80 I 9 0 I ]00 I 125 I 1 5 0 1 175 I 200

F'~llt','Ii BBIVI*)':'~I lllg~2~l miler:I*] ll[iT~,~ll IT:I, . '~I I I [~T/.1 I : ] ; ~ '] I : t*k:~! I£q~2t l I f f / ' ~ l ~ [ [ ~.t~,[Ibl I&'I~IP,] mD,,[lI, eIl~ | i ll]l[fl~]l I I.'114]~,]1 1 [ VtF~II ~ I V,);[II I l I~,[1I~! • DO II~,{:]l II~k'%] ~ ~

(See following page for remainder of proposed tables to Log #228.)

847

Table xx-x Maximum Capacity of Semi-Rigid Tubing in Cubic Feet of Gas per Hour for a Gas Pressure of 2.0 psig or Less and a Pressure Drop of 1.0 psig (Bas on a 0.6 Specific Gravity Gas)

Nominal Tubing

Diameter Internal Inside Diameter 5

9nche~/ IInch~l I

1/4 0.S15 ~I 318 0.430 I 112 0.545 I r~ 5/8 0.666 I ~-~:., 3/4 0.785 I g"g~ ] 1.025 i ~ 1 1/4 L265 I ~ ] 1 /2 1.505 I g~'~ 2 1.985 ' L ~ 2 ] / 2 2.465 I [ ~ :

lO I l~ I 2o I so I 4o I ~0 I 6o I 70 I 8o I 9o I ]9o I 1~ I 150 I 175 l 200 1 25o I 300

~ i ~RII B ~ i ~ Iraqi I ; ~ ~ B ~ I ~ ~ I I ~ ~ I ~ I I ~

o0 o~

Table xx-x Maximum Capacity of Semi-Rigid Tubing in Cubic Feet of Gas per Hour for a Gas Pressure of 5.0 psig or Less and a Pressure Drop of 3.5 psig (Based on a 0.6 Specific Gravity Gas)

I

Nominal Tubing

Diameter Inside

(inches)

] / 4 3/8 1/2 5/8 3/4 i I 1/4 ] 1/2 2 2 1/2

I I i I I I I I i I I i l i i i i l I I I

i ~ °

~ : E ~ - ~Z'-:~---~ m ] _ _E_-~ . _ ~ m ~ E ~ E~'I E!~ L ~ L~ I ~ . ~ l l W~.I ~ ! l W~E ~ n I ~ I

N F P A 54 - - A96 R O P

(Log #188) 54- 201 - (Part 10 Sizing 'rabies (New)): Accept in Part SUBMITTER: BruceJ. Swiecicld, National Propane Gas Association RECOMMENDATION: The proposal is to add sizing tables for polyethylene plastic pipe and tubing to Part 10 of the NFPA 54/ ANSI Z223.1, National Fuel Gas Code. The sizing tables are shown following.

Polyethylene Plasdc Tube Sizing

Sizing Between Single or Second Stage Regulator and Building

Maximum undiluted propane capacities listed axe based on 10 psig first stage setting and I psig pressure drop

Gapacities in 1,00OBtu/hr

Plastic Tubing Length Feet

30 40 50 60 70 80 90 100 125 150 175 200 225 250 275 3OO 350 400 450 5OO 6OO 7OO 8O0 9O0 19O0 1500 2000

Plastic Tubing Size (CTS) (dimensions in parenthesis awe inside diameter)

1/2 in. CTS SDR 7.00 (.445)

762 653 578 524 482 448 421 397 552 519 294 273 256 242 230 219 202 188 176 166 151 139 129 121 114 92 79

SUBSTANTIATION: Pipe sizing tables for plastic piping are needed in the National Fuel Gas Code for propane systems. COMMITTEE ACTION: Accept in Part. Accept the Proposed table for sizing between single or second stage

regulator and building to replace current table 10-16. COMMITTEE STATEMENT: The table for interstage pressure is not accepted consistent with the proposed change in scope of the National Fuel Gas Code to begin coverage at the discharge of the final stage pressure regulator for propane. Table 10-16 is also deleted as it is outside the scope of the Code.

l in . CTS SDR 11.00 (.927)

5225 4472 Plastic Tubin~ 5964 Length Feet 3591 33O4 $074 10 2884 2O 2724 30 2414 4O 2188 5O 2013 60 1872 7O 1757 8O 1659 90 1576 100

125 1503 150 1383 175 1287 20O 1207 225 1140 250 1033 275 951 300 884 350 830 400 784 629 539

Polyethylene Plastic Tube Sizing


Maximum undiluted propane capacities listed axe based on 11 in. W.C. setting and a0.5 in. W.C. pressure drop Capacities in 1,000 Btu/hr

Plastic Tubing Size (CTS) (dimensions in parenthesis m-e inside diameter)

1/2 in. ~ I 1 in. CTS SDR 7.00 (.445) SDR 11.00 f.927)

121 83 67 57 51 46 42 39 37 35 31 28 26 24 22 21 20 19 18 16

829 569 457 391 347 314 289 269 252 238 211 191 176 164 154 145 138 132 121 113

Polyethylene plastic Pipe Sizing

Sizing Between First Stage and Second Stage Regulator

Maximum undiluted propane capacities listed are based on 10 psig first stage setting and 1 psig pressure drop Capacities in 1,000 Btu/hr

Plastic Pipe

Length Feet

3O

5O

" ? 8 " ' " - - "

9 - F - - - - - - V 6 F " - - -

- - ~org~"- - - - - i w - - - - -

- - o o ~ 6 V ' - - ~ F

oo3"6"6----- - - 5 o " s ' g S - -

- - 5o ' gSY"- -

~ G g F - - ' -

s - -6G--- ' - - 9 - - 6 F - -

- - 1 o ' 8 " 6 8 - -

F

1/2 in. SDR 9.33

1.66o /

2143 1835 1626 1478 1555 1261 1183 1117 990 897 826 678 721 681 646 617 567 528 495

3/4 in. SDR 11:0

1.860t

4292 3673 3256 2950 2714 2525 2569 2238 1983 1797 1653 1539 1443 1363 1294 1235 1136 1057 992 937

latic ptpe nommM ou~de lameter dimenfions in parenthes~ are inside diameter

1 in. 1 1/4 in. SDR 11.00 SDR 10.00

/I.077) (1.328 /

7744 13416 6628 11482 5874 10176 5322 9220 4896 8485 4555 7891 4274 7404 4037 6994 3578 6199 3242 5616 2983 5167 2775 4807 2603 4510 2459 4260 2336 4046 2228 3860 2050 3551 1907 3304 1789 3100 1690 2928 1531 2653 1409 2441 1311 2271 1230 2131 1162 2012 953 1616 798 1383

468 424 390 363 340

849 781 726 682 644 517 443

1 1/2 in. SDR 11.00

/1.554/

20260 17340 15568 15924 12810 11918 11182 10562 9361 8482 7803 7259 6811 6434 6111 5830 5363 4989 4681 4422 4007 3686 3429 3217 3039 2441 2089

2 in. SDR 11.00

(1.943}

56402 31155 27612 25019 23017 21413 20O91 18978 16820 15240 14020 13043 12238 11560 10979 10474 9636 [~5"1 I l l

6161 5781

4585 3753

849

N F P A 5 4 m A 9 6 R O P

(Log #193) 54- 202 - (Tables 10-18 to 10-25): Accept SUBMITTER: Robert Torbin, Foster-Miller, Inc. RECOMMENDATION: Change all EHD Flow Designat ion 14 to 15. SUBSTANTIATION: At August 11, 1992 mee t ing o f ANSI LC-1 Jo in t Technical Advisory G r o u p / S u b c o m m i t t e e on CSST, change was approved to change EHD 14 to EHD 15 on all sizing tables. Change based on revised calculation o f Ward tub ing based on LC-I requi rements Section 2.10.1C. COMMITTEE ACTION: Accept.

(Log #194) 54-203- (Tables 10-21 and 10-24): Accept in Principle SUBMITTER: Robert Torbin, Foster-Miller, Inc. RECOMMENDATION: Delete Table 10-21 and Table 10-24 in their entirety, and replaced with revised Tables of the same number . SUBSTANTIATION: Curren t CSST sizing tables allow a pressure drop of 1.5 PSI for systems operat ing at 2 PSI. Systems sized for the m a x i m u m allowable head loss would, therefore, only have 0.5 PSI pressure available at the inlet to the line regulator. For Maxitrol Model 325-3 regulators ( the most c o m m o n type and size regulator used in residential installations) this situation restricts the capacity of the flow th rough the regulator to approximate ly 120 CFH based on an outlet pressure o f 7 in WC. Al though the tables include a warning to the user abou t pressure loss across the regulator, many installers may not unde r s t and dais restriction, and could potentially undersize the system. The C, SST manufac ture rs both provide their own sizing tables where the loss across the regulator is incorporated into the tables. Thus, an installer us ing these tables would avoid this unders iz ing situation. However, the tables in NFPA 54 do no t account for the losses across the regulator, and they mus t be calculated separately f rom the line losses.

To minimize the potential to undersize the tubing, Foster-Miler proposes to replace the cur ren t tables with new ones tha t allow a smaller pressure drop th rough the tubing (changing f rom 1.5 PSI to 1.0 PSI). This change will increase the available pressure drop across the regulator f rom 0.25 PSI to 0.75 PSI, and will significantly increase the capacity t h rough the line regulator f rom 120 CFH to 220 CFH. This change will minimize the chances tha t the supply piping will be unders ized (most typical single family loads do not exceed 200 CFH). l a r g e r (>200 CFH) system capacities will require the use of a larger regulator (such as the Maxitrol Model 325-5) where the capacity constraints associated with the Model 325-3 are no longer an issue.

COMMITTEE ACTION: Accept in Principle. Accept the 2 tables to replace cur ren t tables 10-21 an d 10-24.

Delete the first line below the tables reading "Actual capacities...". In table 10-24 substi tute "1/2" for "3/4" a n d "13 in" for "7 in" in the paragraph below the table. COMMITFEE STATEMENT: The tables are accepted. The deleted text could apply to all tables.

(Log #138) 54- 204 - (Part 11): Reject SUBMITTER: Ted Margraf, Arms t rong Air Condi t ioning Inc. RECOMMENDATION: We r e c o m m e n d the Vent Sizing Tables for Category I Vent ing Systems in the National Fuel Gas Code Book agree with the GAMA/AGA Category I Vent ing Tables for Central Furnaces.

NOTE: Suppor t ing material is available for review at Amer ican Gas Association and NFPA Headquarters . SUBSTANTIATION: 1. The GAMA/AGA Vent ing Tables for Category I are more conservative than those pr in ted in the National Fuel Gas Code ...... and .........

2. The addit ional cost to manufac ture rs of providing copies of the GAMA/AGA Vent Tables with each Category I furnace would be el iminated if the Tables in the NFGC reflected the GAMA/AGA Vent Tables for Category I Central Furnaces. C O M M r I T E E ACTION: Reject. COMMITYEE STATEMENT: The commit tee agrees that the vent ing tables conta ined in the Code provide the most strict adhe rence to the research on which the tables were based.

Table 10-21 Maximum Capacity of CSST in Cubic Feet per Hour for G as pre~ure of 2 psi and a Pressure Drop of 1 psi (Based on 0.60 Specific Gravity Gas)*

Tubing Length (ft) EHD** How Designation 10 25 30 40 50 75 80 110 150 200 250 300 400 500

13 270 166 151 129 115 93 89 79 64 55 49 44 38 34 15 353 220 200 172 154 124 120 107 87 75 67 61 52 46 18 587 374 342 297 266 218 211 189 155 135 121 110 96 86 19 700 444 405 351 314 257 249 222 182 157 141 129 111 100 23 1098 709 650 567 510 420 407 366 302 263 236 217 189 170 25 1372 876 801 696 624 512 496 445 364 317 284 260 225 202 30 2592 1620 1475 1273 1135 922 892 795 646 557 497 453 390 348 31 2986 1869 1703 1470 1311 1066 1031 920 748 645 576 525 453 404

Actual capacities may vary slightly from those indicated, and users should verify actual performance using the manufacturers' certified installation guide.

Table does not include effect of pressure drop across the line regulator. If regulator loss exceeds 3 /4 PSI tBased on 7 in. WC outlet oressure. DO NOT ItL~,~d..I~:~&gLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator ~ay vary with flow r a t e .

CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consultwith regulator or tubing manufacturer for guidance.

*Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger number of bends and /o r fittings shall be increased by an equivalent length of tubing according to the following equation: L-1.3n where L is additional length (It) of tubing and n is the number of additional fittings and /o r bends.

**EHD - Equivalent Hydraulic Diameter. A measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.

850

N F P A 54 - - A 9 6 R O P

Table 10-24 Maximum Capacity of CSST in Thousands of Btu per Hour of Undiluted Liquefied Petroleum Gases at a Pressure of 2 psi amd a Pressure Drop of 1 psi

(Based on 1.52 Specific Gravity Gas)*

Tubing Length (ft) EHD** Flow Desiwaafion 10 25 30 40 50 75 80 110 150 200 250 300 400 500

13 426 262 238 203 181 147 140 124 101 86 77 69 60 53 15 558 347 316 271 243 196 189 169 137 118 105 96 82 72 18 927' 591 540 469 420 344 333 298 245 213 191 173 151 135 19 1106 701 640 554 496 406 393 350 287 248 222 203 175 158 23 1735 1120 1027 896 806 663 643 578 477 415 373 343 298 268 25 2168 1384 1266 1100 986 809 7684 703 575 501 448 411 355 319 30 4097 2560 2331 2012 1794 1457 1410 1256 1021 880 785 716 616 550 31 4720 2954 2692 2323 2072 1685 1629 1454 1182 1019 910 829 716 638

Actual capacities may ~,,u-y slighdy from those indicated, and users should verify actual performance using the manufacturers' certified installation guide.

Table does not include effect of pressure drop across the line regulator, ff regulator loss exceeds 3/4 PSI (Based on 7 in. WC oudet oressure. DO NOT USE THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may varywith flow r a t e .

CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.

*Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger number of bends and /o r fittings shall be increased by an equivalent length of tubing according to the following equadon: L-1.3n where L is additional length fit) of tubing and n is the number of additional fittings and /o r bends.

**EHD - Equivalent Hydraulic Diameter. A measure of the reladve hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.

(Log #198) 54- 205 - (Part 11, Note 17 on Multiple Appliance Venting, Tables 11-12 and 11-13): Accept in Principle SUBMITTER: Allen L. Rutz, Battelle RECOMMENDATION: Modify the text as shown:

17. Tables 11-6. 7, 8,9, aJnd l0 TI~,. ~,b',c~ ; .c ' ,udcd ;u zl,;s pa, t shall be used for ch imneys a n d vents no t exposed to the outdoors below the roof line. Ch;;a,,c)7. o,- vc. tz cxpvscd to ~,,. ouCdv,~is l~-k , . ;.I,,.

s.t~t,Iic,, v, Zl,c a,.Zl~o, ;;.): L~, i . s j~ ,%d;cGo, , A Type B vent or listed ch imney lining system passing th rough an unused masonry ch imney flue shall no t be considered to be exposed to the outdoors. Table 11-3 in combina t ion with Tables 11-12 and 11-13shall be used for clay-die-lined exterior masonry chirrmevs, nrovided:

(a) Vent connec to r is Tvoe B double-waft, and (:15) At least one anolianc'e is draft hood-eeuioDed, and (c~ The combine 'dann l i ance caoacitv is I~ss'than the m a x i m u m

caDacitv ~iven by Table 11-19a (for NA~f+NAT~ or Table 11-13a (for

(d~ The canacitv of each soace-heat inlzant) l ianceis crreater than the m i n i m u m cafiacitv ~ived bv Table 11-12b (for NA'F+NAT~ or Table 11-13(b~ (for F?dq+NA'I~ .

NOTE: Lo~:al 99 oercent winter desicm temperat;ur¢, need to use Table 11-12 and 11"-13 are listed in AS~HRAE Handbook-Fundamen- tals~

If these c00dit ions canno t be met. an alternative venfin~ desima shall be use. such as a listed ch imney linin~ system.

Excenfioni Vent in~ instruct ions t)~ovide~ bv the annl iance manu tac tu re r may be used in olac~ of these ~uidelifi~s. her section 1.~ of t | le NFGC.

(See r emainder of proposed tables on the following pages.)

SUI~T.GNTIATION. The technical background for this revision is conta ined in the Gas Research Institute repor t GRI-94/0193 'Wenting Gas Appliances into Exterior Masonry Chimneys: Analysis and Recommendat ions" . The exterior ch imney m i n i m u m capacity tables conta ined in Appendix A of the repor t are proposed here to be added to the NFGC, for the "1000-hours" condition, and for 83 percent steady-state thermal efficiencies.

We chose the "lO0-hours" condit ion over the "design" condit ion as the basis for the r e c o m m e n d e d code revision. Because masonry materials are no t expected to degrade in the presence of gas appliance condensate, condensa te disposal is the critical issue in masonry chimneys. The "100-hours" condit ion limits the potential for long-term problems associated with excessive moisture in masonry chimneys, while no t be ing overly restrictive as limits based on the "design" condi t ion would be.

Because the steady-state thermal efficiencies of gas appliances are no t available to HVAC ins~llers , the guidel ines are based upon the h ighes t Category I appl iance steady-state efficiency limit of 83

percent. Appliance manufac ture rs may choose to provide alternative vent ing guidel ines with their installation instructions for appliances operat ing at steady-state efficiencies lower than 83 percent .

In the proposed single appliance Tables 11-12 and 11-13, "NR" is shown in Tables l l -12(b) and l l -13(b) for configurat ions where the m i n i m u m space-heat ing appliance capacity plus 25,000 B t u / h r exceeds file m a x i m u m combined appliance capacity f rom Tables 11- 12(a) and l l -13(a) respectively.

25,000 B t u / h r is a s sumed to be the m i n i m u m appl iance size that would be c o m m o n vented with a space-heat ing appl iance into an exterior masonry chimney. COMMITTEE ACTION: Accept in Principle.

Accept the proposal and 1. Revise Exception to read: Exception: The . so ,,f bL, C ~bl.-... f~,i The installation of vents

serving listed appliances shall be permi t ted to be in accordance with the appliance manufac tu re r ' s instructions and the te rms of the listing.

2. Insert Tables 11-12 and 11-13 as proposed. C O M M I T r E E STATEMENT: The Exception has been editorially revised and reference to manufac tu re r ' s instruct ions and te rms of listing has been added.

Table 11-12. Exterior Masonry Chimney, NAT + NAT Installations with Type B Double-Wall Connectors

11-12a. Combined Appliance Maximum Input Rating in Thousands of Btu per Hour

Vent Heighl (feet)

6

8

10

15

20

30

50

100

Internal Area of Chimney, Square Inches

12 19 28 38 50 63 78 t13

25 46 71 103 143 188 246 NR

28 53 82 119 163 218 278 408

31 56 90 131 177 236 302 454

N R 67 106 152 212 283 365 546

N R NR NR NR N R 325 419 648

. R 496 749

9 ~

; N R N R ;NR N R N R N R N R ; N R

851

N F P A 54 - - A 9 6 R O P


11-12b. Minimum Allowable Input Rating of Space-Heating Appliance in Thousands of Btu per Hour

Vent Internal Area of Chimney, Square Inches Height (feet) 12 19 28 38 50 63 78 113

Internal 99% Winter Design Temperature:

6 0 0

8 0 0

10 0 0

15 i:NR o (.0

20 o u -

30

50

100

6

8

10 ou-

15 o c% 20 NRi NI

30

37°F or Greater

0 0 0

0 0 0

0 0 0

0 0 0

0 0 :NR!

0 0 0

0 0 0

0 0 0

N R 184 0 0

o

N . NR: Internal 99% Winter Design Temperature:

27 to 36°F

0 0 68 NR : NR 180 212 I N R . . . . . . . . . . . . . ....

0 0 82 NR NR 187 214 263

0 51 NR NR N R 201 225 265

253 274 305

307 330 362

NR NR NR NRI !NR :NR 445 485

50 :i:NR NR :NR NR INRIiI:iNR :NR 763 ::: : : : : : : : :

lOO Internal 99°/° Winter Design Temperature:

17 to 26°F

6 : : : : : : : : : : : : : : :::::::: : : : : :::: ::: : : : : : : : : : : : : : : : : : : :

8 3 2

Nai N R i : : N R : N R ~NR NRi 278 358

NR iNl~ NR! NR ilNR iNR 331 398 : : : : : . : : : : :: :::: :::::: : ::::: : : : : : : : : ::: : : : : : : : : :

NR NR ~R :NR NR iN~ 387 457

NR:: iNR NR :=I~R INRI I iNR INR 581

50 862 : : : : : : : : : : : : :: : : : : : : : : : : : .

1oo

10 o u-

15 o

20

30



Internal 99% Winter Design Temperature: 15 to 16°F

6 iNR NR NR NRi NR NR NR NR : : : : : : : : : : : :

8 NR N~ N~ !::NR ;;NR NR NR NR

u. 430 lO

o 15 ~R NR ::NR NR: NR NR NR 485 I.¢)

20 547

NR NR :::~R: ~R NR NR NR 682

o,

30

50

100 Local 99% Winter Design Temperature:

4°F or Lower

Table 11-13. Exterior Masonry Chimney, FAN + NAT Installations with "l~jpe B Double-WaU Connectors

11-13a. Combined Appliance Maximum Input Ratin~l in Thousands of Btu per Hour

Vent Height (feet)


12 19 28 38 50 63 78 113

6 74 119 178 257 351 458 582 853

8 80 130 193 279 384 501 636 937

10 84 138 207 299 409 538 686 1010

15 NR 152 233 334 467 611 781 1156

20 NR iNR 250 368 508 668 858 1286

30 NR NR N R 404 564 747 969 1473

50 831 1089 1692 : : : : :

t oo 1921

852

N F P A 5 4 - - A 9 6 R O P

Table 11-13. Extedor Masonry Chimney, NAT + NAT Installations with "lype B Double-Wall Connectors

11-13b. Space-Heating Appliance Minimum Input Rating in Thousands of Btu per Hour

Vent Height (feet)

6

8

f o

(9 15

LI .

t&.

~o 09

11-13b Space-HeatingAppliance Minimum Input Rating in Thousands o1 Btu per Hour

20 iNR NR 123 190 184 0 0

30 NR:::NR~I~NR:.:: 334 398 393 334 0

50 714 707 579

lOO 18oo Internal 99% Winter Design Temperature:

• 27 to 36°F

8

10

15

Internal Area of Chimney, Square Inches Vent Internal Area of Chimney, Square Inches Height

12 19 28 38 50 63 78 113 (feet) 12 19 28 38 50 63 78 113 Internal 99% Winter Design Temperature: nterna % rater eslgn emperature:

37°F or Greater 5 to 16°F

0 0 0 0 0 0 0 0 6 N R 78 121 166 214 252 301 416 i : i : i l

0 0 0 0 0 0 0 0 8 94 135 182 230 269 312 423 i:! iili i i

0 0 0 0 0 0 0 0 10 N R 111 149 198 250 289 331 430

0 0 0 0 0 0 0 ~ 15 NR NR 193 247 305 346 393 485

249 o 20 NR NR NR 293 360 408 450 547

30 377 460 531 580 6 ~

50 NR! I INRI !NR NR; NR 797 853 972

100 N R NR NR iNR NRi~NR ::NR11833

0 0 68 116 156 180 212 268

0 0 82 127 167 187 214 263

0 51 97 141 183 201 225 265

i N R 111 142 183 233 253 274 305

20 187 230 284 307 330 362

30 !NR NR NR 330 319 419 445 485

50 672 705 763 : : 5 : : : : : : : : : : : : : : : : : : : : : : : : : : : • : : : • :

100 NR::NRii NR !NR:::: N R : I N R ! N R 1554 Internal 99% Winter Design Temperature:

17 to 26°F

6 0 55 99 141 182 215 259 349

8 52 74 111 154 197 226 264 352

10 NR 90 125 169 214 245 278 358 ::5 :

oU- : 5 : : : : : : :5::::

¢o 15 NR NR 167 212 263 296 331 398 .9o r-. 20 NR; NR 212 258 316 352 387 457

30 NR NR NR 362 429 470 507 581

so 723 766 s62

100 1689

Internal 99% Winter D eSoign Temperature: -10 to 4 F

6 N R I N R 145 196 249 296 349 484

8 2s9 320 371

N R : N R 175 231 292 339 397 513 ...........

283 351 404 457 586

NR NR NR:: 333 408 468 528 650

30 N R ~ N R ~ N R NR NR 603 667 805

50 ::NR :::NR NR i : i N R : N R : NR 955 1003 : : : : : : : : : : : 5 : : : : : : 5::: : : : : 5

: . : : . : : : : : .: : : : : : : : : 100

10 o u -

~" 15 .go Q "7 20

O ._1

ou-

Local 99% Winter Design Temperature: -11 °F or Lower

(Log #201) 54- 206 - (Part l 1, Note 3 on Multiple Appliance Venting): Accept in Principle SUBMITTER: Allen L. Rutz, Battelle RECOMMENDATION: Add the under l ined text as follows.

13. Where used in mult istory systems, vertical c o m m o n vents shall be Type B double-wall and shall h,c;~ ,,,, , ,~c~; be installed with a listed vent caD. A mult istorv c o m m o n vertical ven t shall be nermi t ted to 'have a single offset, nrovided: " (a] The offset does no t exceed 5.5 deaTees, and

(b~ For those nor t ions of the c e r u m e n vertical vent located below the Offset. the c o m m o n vent canacitv listed in the c o m m o n vent inv tables is reduced by 20 percent ' (0 .80 x m a x i m u m c o m m o n vent capacitY), and

(c) The horizontal length o f the offset does no t exceed 1 1 / 2 ft for each inch (18 crn oer cn~ of c o m m o n vent diameter. SUBSTANTIATION: Similar vent ing per formance can be achieved for the following two situations:

a) Multistory vent ing system having no offsets being used to vent appliances having a combined inpu t rating equal to the listed m a x i m u m c o m m o n vent capacity.

b) Mult is toryvent ing system having 45-degree offsets being used to vent appliances having a combined inpu t rat ing equal to 80 percent of the listed m a x i m u m c o m m o n vent capacity, for those appliance located below the offset.

Thus a 20 percen t reduct ion in m a x i m u m c o m m o n vent capacity effectively compensates for the added friction of a 45-degree c o m m o n vent offset. This has been shown by compu te r s imulat ions of mult istory vent ing systems us ing the VENT-M compute r program. This work will be d o c u m e n t e d in a GRI report on multistory vent ing issues. C O M M I T r E E ACTION: Accept in Principle• Accept proposal and 1. Revise "a" to read: a.. The offset angle does no t exceed 45 degrees, and • Reletter p resen t "b" as "c" a n d p resen t "c" as "b", respectively.

3, Revise new "b" by adding "of the s e g m e n t in which the offset is located" at the end of the sentence.

4. Revise new "c" to read: (c) For the s egmen t of the c o m m o n vertical vent conta in ing the

offset, the c o m m o n vent capacity listed in the c o m m o n vent ing tables is reduced by 20 percen t (0.80 x m a x i m u m c o m m o n vent capacity), and

5. Add a new "d" to read: d. A multi-story c o m m o n vent shall no t be reduced in size above

the offset. C O M M I T r E E STATEMENT: Accept proposal with editorial revisions• The new "d" prevents a possible misuse o f the rule.

853

N F P A 54 - - A96 R O P

( Log #214) 54- 207 - (Part 11): Accept in Principle SUBMITTER: James A. Ranfone, American Gas Association RECOMMENDATION: ACTION REQUESTED: Substitute "NP" (Not Permitted) for "NR" (Not Recommended) in venting tables and revise footnote #9 in Part I I as follows:

9. ~ NP Vent configuration is n o t , co,., ..... c,,dc.d ~ due to potential for condensate formation or pressurization of the vendng system. SUBSTANTIATION: NR implies that daere is possibility that acceptable venting can be accomplished. NP clarifies that dais is not the case. It eliminates language that officials believe is permissive. COMMITFEE ACTION: Accept in Principle. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-237 (Log #220).

(Log #CP48) 54- 208- (Part 11 Notes): Accept SUBMITTER: National Fuel Gas Code Committee, RECOMMENDATION: Renumber all "Notes" in Part 11 as numbers i.e. 11-1, 11-2, etc. SUBSTANTIATION: Editorial. COMMITrEE ACTION: Accept.

(Log #197) 54- 209 - (Part 11, Note 10 on Single Appliance Venting): Accept in Principle SUBMITTER: Allen L. Rutz, Battelle RECOMMENDATION: Modify the text as shown:

10. Tables I 1-1, 2. 3 .4 and 5 T:,,. ~Llc~ ; , ,c:udcd ; . ;5,;o pa, ;. shall be used for chimneys and vents not exposed to the outdoors below the r o o f line. Cl.,;,,:,czo o, v,.:,;., cxt, ozcd t-, d~c ou;dc, oSs b3:c,-,; d,c

hse/,lK~,. C~,.~u,~ hi,,..,t,v,;~,,c,. ;c,a,,~.~c;.u, c , . . ,~c ,.,ca; sc, . ; , ,g g,.o .ac, vl;~,' , ,~, d,,_ ,,ud,,,, ;;./',~,;,,tLiu; ;sd;c;2+,, A Type B vent or listed chimney lining system passing through an unused masonry chimney flue shall not be considered to be exposed to the outdoors. Table 11-3 in combination with Table 11-11 shall be used for clay-tile-Lined exterior masonrv chinmevs, provided:

(a~ Vent connector is T;c~e" B double-wall, and Cb) Vent connector lengih is limited to 1 1/2 ft for each inch of

vent connector diameter, and (ci The annliance is draft hood-eauiooed, and id~ The iia6ut ratine is less than tffe fiakximum canacitv ~iven by

Table 11-3. and " " (e) For a space-heating appliance, the input ratin~ is ~reater than

the mi~aimum capacity, given by Table 11-11. NOTE: Local 99 percent winter desima temperatures need to use

Table 11-11 are listed in ASHRAE Handbook-Fundamentals. ff these conditions cannot be met. an alternative venting design

shall be use. ;uch as a listed chimney linin~ system. Exception: Ventin~ instructions Drovidec~ by the aDoliance

manufacturer may be used in olaee of these ~uidelines. her section 1.2 of the NFGC.

Table 11-11. Exterior Masonry Chimney, Single NAT Installations with Type B Double-Wall Vent Connectors Minimum allowable input rating of space-heating appliance

in thousands of Btu per hour

Vent Internal area of chimney, square inches height (feet) 12 19 28 38 50 63 78 113

Internal 99% winter design temperature: 37°F or Greater

8

10

o

~ 2o

L L

¢ O

O

ou- ¢ o o J

o

30

50

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0

N R N R 123 190 249 184 0 0

NF:{ NI~ NR NR NR 393 334 0 i i : ! i ! : i i i i i : : i

: : : : :

579

6 0

8 0

10 0

is 23s

20 307

so 4t 9

Interna199%Winter Des~nTemperature: 27to 36°F

0 68 116 156 180 212 266

0 82 127 167 187 214 263

51 97 141 183 201 225 265

253 274 305

330 362

445 485

30

50

76s

Internal 99% Winter Design Temperature: 61 17t°2s°F

, ; NR NR NR NR; NR 215 259 349

8 197 226 ss2

10 N R : ; NR ;NR ;; NR 214 245 278 358 : : : : : :

15 296 331 398

352 387 457

507 581

Minimum allowable input rating of space-heating appliance in thousands o f Btu per hour

Vent Internal Area of Chimney, Square Inches height (feet) 12 19 28 38 50 63 78 113


6 N R N R NR N R . . . N R ~::NR N R 416

8 . NR NR NR: NR N R NR 312 423 x

u- 10 NR N R NR NR NR : 289 331 430

15 N R :NR N R NR NR N R 393 485 .9. ° :: . . . . . :

20 N R N R INR :NR : NR NR 450 547

30 N R N R NR i NR : NR NB N R 682 : : : : : :

50 N R N R : N R :NR N R N R : NR 972 . . . . . . . . . . . • : : . • i

Internal 99% Winter Design Temperature: -10 to 4°F

6 NR N R NR NR NR 4 8 4

8 I N R N R NR N R N R : NR NR 494

u_ t0 NR NR NR- N R NR NR NR: 513 o

"o ls NR . R NR NR NR NR NR S86 Q

'7 20 :NR NR NR N R . N R N R N R 650

30 NR: N R NR .NR NR NR NR 805

so N . Nn N.I::Na NR: NB N. 1003 internal 99% Winter Design Temperature:

-11 °F or Lower o

. . J

u. Not recommended for any vent:configura~ons. o

854

N F P A 5 4 ~ A 9 6 R O P

SUBSTANTIATION: The technical background for this revision is contained in tl]e Gas Research Institute report GRI-94/0193 "Venting Gas Appliances into Exterior Masonry Chimneys: Analysis and Recommendations". The exterior chimney minimum capacity tables contained in Appendix A of the report are proposed here to be added to the NFGC, for the "1000-hours" condition, and for 83 percent steady-state thermal efficiencies. We chose the "100-hours" condition over the "design" condition as

the basis for the recommended code revision. Because masonry materials are not expected to degrade in the presence of gas appliance condensate, condensate disposal is the critical issue in masonry chimneys. The. "100-hours" condition limits the potential for long-term problems associated with excessive moisture in masonry chimneys, while not being overly restrictive as limits based on the "design" condition would be.

Because the steady-state thermal efficiencies of gas appliances are not available to HVAC installers, the guidelines are based upon the highest Category I appliance steady-state efficiency limit of 83 percent. Appliance manufacturers may choose to provide alternative venting guidelines with their installation instructions for appliances operating at steady-state efficiencies lower than 83 percent.

In the proposed single appliance Table 11-11, "NR" is shown where the minimum space-heating appliance capacity for an exterior chimney exceeds the maximum capacity now listed in the NFGC Table 11-3 for interior chimneys. COMMITrEE ACTION: Accept in Principle. Accept the proposal with the following changes: 1. Revise Exception to read: Exception: Tkc ua¢ +f ~:,c ~blc~ f~, the installation of vents serving

listed appliances shall be permitted to be in accordance with the appliance manufacturer's instructions and the terms of the listing.

2. Delete the proposed "Note" to Note 10.

3. Insert Figure G-19, Local 99 percent winter design temperatures in the United States (note that title should be "-10")

4. Insert Table 11-11 as proposed by the submitter and add a new Note to Table 11-11 stating that "See Figure G-19 for a map showing local 99 percent winter design temperatures in the United States can be found in Appendix G." COMMITI'EE STATEMENT: The proposal is accepted with editorial modifications.

(Log #174) 54- 210 - (Part 11, Note 10 for Tables 11-1 thru 11-5 and Note 17 for Tables 11-6 thru 11-10): Accept in Principle SUBMITTER: Robert G. Meyers, Long Island Lighting Co. RECOMMENDATION: a. Provide practical guidance as to how to address the use of a chimney (masonry) exposed to outdoors. This could entail added and/or revised text. ff guidance is provided elsewhere, perhaps these notes could be deleted.

b. ~ use of exposed masonry chimneys and single wall vent with appliances at efficiencies greater than 80 percent. SUBSTANTIATION: On Long Island, the preponderance of chimneys are masonry and are exposed on three sides below the roof line. On gas conversions this creates countless problems for LILCO. It is difficult for us to recommend the expense of a chimney liner or installing doiJble wall B vent inside the chimney. We request that the code address this issue and provide clear guidatace. COMMITrEEACTION: Acceptin Principle. COMMITI'EE STATEMENT: Refer to Committee Actio on Proposal 54-209 (Log #197).

5 F. "10 F

27 F

-10F

5F

37

17F

27 F

, 37F

9 9 % Winter Des ign Temperatures for the Uni ted States.

This map is a necessarily generalized guide to temperatures in the United States. Temperatures shown for areas such as mountainous regions and large urban centers may not be accurate. The data used to develop this map are from the 1993 ASHRAE Fundamentals Handbook (Chapter 24, Table 1: Climatic conditions for the United States).

F~gure C.-19

855

N F P A 54 ~ A 9 6 R O P

(Log #152) 54-211 - (Part 11 Note 1): Reject SUBMITTER: Dirk N. Granberg, PVI Industries, Inc. RECOMMENDATION: Add the following phrase to Note 1:

"When obstruct ions are installed in the vent ing system, vent sizing and construct ion shall be in accordance with o ther approved engineer ing me thods and the gas ven t and gas e q u i p m e n t manufacturer's instruction. C o m m o n l y used obstructions include draft regulators, hea t reclaimers, vent damper s and economizers." SUBSTANTIATION: Cur ren t language specifically states which vent ing tables shall no t be used but no t which vent ing instructions shall be used. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The commit tee agrees tha t coverage u n d e r 7.15 is re ferenced in the Note and addresses the subjecL

(Log #123) 54- 212 - (Part 11, Note 9): Reject SUBMITTEPa Russel Iwan, Metropoli tan Utilities District RECOMMENDATION: DELETE: #9 The flow area of the vertical vent shall no t exceed seven t imes the flow area of the listed appliance categorized vent area, flue collar area, or draft h o o d outlet area unless des ignated in accordance with approved eng ineer ing methods . SUBSTANTIATION: After visiting with officials at NFPA, AGA, and GRI, I cannot f ind anyone tha t can come up with the technical data to substantiate this rule. New research is needed to substant iate this rule if it is to remain in the code. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: Refer to Commit tee Action on Proposal 54-156 (Log #73).

(Log #124) 54. 213 - (Part 11, Note 13): Accept in Principle SUBMITTER: Russel Iwan, Metropoli tan Utilities District RECOMMENDATION: DELETE: "#13 . . .and shall have no offsets." SUBSTANTIATION: After visiting with officials at NFPA, AGA, and GRI, I canno t f ind anyone tha t can come up with the technical da ta to substantiate this rule. New research is needed to substant iate this rule if it is to r emain in the code. Why is this rule required in multistory systems, bu t no t in traditional systems (See Note #5)? COMMITrEE ACTION: Accept in Principle. COMMITrEE STATEMENT: Refer to Commi t tee Action on Proposal 54-206 (Log #201).

(Log #125) 54. 214 - (Part 11, Note 14): Reject SUBMITTER: Russel Iwan, Metropoli tan Utilities District RECOMMENDATION: DELETE: #14 Where two or more appliances are connec ted t O a vertical ven t or chimney, the flow area o f the largest section o f vertical vent or ch imney shall no t exceed seven t imes the smallest listed appl iance categorized ven t areas, flue collar area, or draft h o o d outlet area unless des igned in accordance with approved eng inee r ing methods . SUBSTANTIATION: After visiting with officials at NFPA, AGA, a n d GRI. I canno t f ind anyone that can come up with the technical data to substantiate this rule. New research is needed to substantiate this rule if it is to r emain in the code. COMMITTEE ACTION: Reject. C o i M r r r g E STATEMENT: Refer to Commit tee Action on Proposal 54-156 (Log #73).

(Log #220) 54. 215 - (11.1): Accept in Principle SUBMITTER= David S. Johns ton , DSJ Technical Services RECOMMENDATION: Revise the following defini t ions as shown:

3. FAN Min. The c,,;,,:;.:,.,, at, t,l:a~,cc k, vuz ;,,dog ,,.% G a i c ~ , y I at./.l~cc ~.;;I, :. 2..~ .,....~tcd c~.,~;b..z;.;.... ~zoi..., iL..i ~,,~Id l~- az~c,,,.d ~,, d,c ~,c,,:. T he m i n i m u m annl iance i nnu t rat ing of a Category I. fan-assisted annl iance tha t shall be a t tached to a. ven t or connect 'or with the indic.ated combinat ion of size. he igh t ao~t lateral or rise.

Category | fan-assisted annl iance that shall be a t tached to a v e n t or conn~ectbr with the indica.ted combinat ion of size. he igh t an d lateral

v

or qrrrrrrrM~.

wt~L Tl,c,~ are ,,6 , ,J .Amu,~ ~vel'....cc ; ,Vul , ad .g~ ,% d,c d , . . ' l ht ,~d cqulv,,,i~,~ ,,vVl;~,c~o. The m a x i m u m appliance input rat ing of a Category L draft hood-eau inned aooliance that shall be a t tached to a vent or conner(or 'wi th tl{e" indicated combinat ion of size. he igh t and lateral or rise.

e J _ ._ r _ _ . , . . . . . • ,- _ r . , . . . . . - . . . . . . . .

nebr. ~ N A V e n t configurat ion is no t acceptable due to notential for condensa te format ion or pressurization of the vent ing s;cstem, or not applicable due to physical" or geomen ' ic restraints. ~ "

[ C h a n g e all instances of NR in tables to NA] SUBSTANTIATION: These proposed changes are in tended to address concerns which have been raised regarding the ambiguity and enforceability of language associated with the Part 11 sizing tables.

Use of the word "could'" in the cur ren t language detracts f rom the enforceability of the terms. Since these defini t ions refer to manda to ry m i n i m u m s and m a x i m u m s in the tables, they mus t be def ined in enforceable language. In addition, the definit ions have been ex tended to make it clear that each m i n i m u m or m a x i m u m applies to the particular configurat ion of the connector or vent.

Similarly, the te rm "not r e c o m m e n d e d " (NR) is no t a manda to ry term. If the indicated entries in the tables are no t acceptable, then both the acronym and its defini t ion should state such unambiguously. COMMrrrEE ACTION: Accept in Principle.

Revise the following defini t ions as shown: 3. FAN Min. The m i n i m u m input rat ing of a Category I, fan-

assisted appliance a t tached to a vent or connector . 4. FAN Max. The m a x i m u m inpu t rating of a Category I fan-

assisted appliance a t tached to a vent or connector . 5. NATMax. The m a x i m u m inpu t rating of a Category I, draft

hood-equ ipped appliance a t tached to a vent or connector . 9. NA Vent configurat ion is no t permi t ted due to potential for

condensa te format ion or pressurization o f the vent ing system, or not applicable due to physical or geometr ic restraints. COMMITrEE STATEMENT: Accept the proposal with editorial modifications.

(Log #215) 54- 216 - (11.1 Multiple Appliance Note 10): Accept in Principle SUBMITrER: David S . Johns ton , DSJ Technical Services RECOMMENDATION: Split mult iple appl iance note 10 into two notes, as follows:

10. Connec tor rise (R) for each appliance connector shall be measu red f rom the draft h o o d outlet or flue collar to the level where the vc.,t go~ ~z, c ~ ; ~ c,,;.;c ~,,gcd,c~ connec to r io ins the c o m m o n veoL a manifold, or ano the r connector .

11. For mult iple units of gas utilization e q u i p m e n t all located on one floor, available total he igh t (H) shall be measu red f rom the h ighes t draft h o o d outlet or flue collar up to the level of the te rmir r~ , outlet o f the c o m m o n vent.

[ R e n u m b e r subsequen t notes] SUBSTANTIATION: These p roposed changes are in t ended to address concerns which have been raised r ega rd ing the ambiguity and enforceability of language associated with the Par t 11 sizing tables.

This proposal splits no t 10 into two notes to provide more clarity and pu t informat ion on similar subjects together. The sen tence deal ing with connector rises places first to allow the sen tence on he igh t for single story installations to come immediate ly before the note on he igh t for mult istory installation. The parenthet ical " (not applicable to multistory)" is dele ted entirely because it does n o t apply to the m e a s u r e m e n t of connector rise anyhow. Both sentences have been slightly reworded for better clarity. COMMI3[TEE ACTION: Accept in Principle.

Revise "10" to read: 10. Connec to r rise (R) for each appliance connec tor shall be

measu red f rom the draft h o o d outlet or flue collar to the centerl ine where the vent gas s t reams come together.

Accept "11" as proposed. COMMITI'EE STATEMENT: Accept proposal with editorial modifications.

856

N F P A 54 ~ A 9 6 R O P

( Log #2 16) 54- 217- (11.1 Multiple Appliance Note 15): Accept SUBMITTER: David S. Johnston, DSJ Technical Services RECOMMENDATION: Revise multiple appliance Note 15 as follows:

15. For appliances with more than one input rate, the min imum vent connector capacity (FAN Min) de te rmined from the tables shall t ~ t be Less than the lowest appliance input rating, and maximum vent connector capaciW (FAN Max or NAT Max) de termined from the tables shall be greater than the highest appliance input rating. SUBSTANTIATION: Tbese proposed changes are in tended to address concerns which have been raised regarding the ambiguity and enforceability of language associated with the Part 11 sizing tables.

The inclusion of the word "not" was probably a typographical error in the original submission, but it substantively changes the intent of dais note. This proposal corrects the error. COMMITTEE ACTION: Accept.

(Log #217) 54- 218- (11.1 Multiple Appliance Note 20): Accept SUBMITTER: David S. Johnston, DSJ Technical Services RECOMMENDATION: Delete the NOTE following multiple appliance note 20. SUBSTANTIATION: These proposed changes are in tended to address concerns which have been raised regarding the ambiguity and enforceability of language associated with the Part 11 sizing tables.

While the information contained in this NOTE is undoubtedly good advice, it does not state a requirement and therefore should not be included among mandatory provisions, ff it can be reworded and substantiated as a mandatory requirement then it should be included in note 20; otherwise it should be deleted or moved to a non-mandatory appendix. COMMITTEE ACTION: Accept.

(Log #227) 54-219- (11.1 Multiple Appliance Note 21 ): Accept SUBMITTER2 David S.Johnston, DSJ Technical Services RECOMMENDATION: Revise multiple appliance note 21 as follows:

"Interpolation bcTc,,,d ;Lc ;~blc ~,,h ;c~ d,--'. ,,,,;~ L.~ t'~, ;..;&,.d shall be permit ted in calculatin~ canacities for vent dimensions that fall between table entries. (Sere E~ample 3, Appendix G)" SUBSTANTIATION: These proposed changes are in tended to address concerns which have been raised regarding the ambiguity and enforceability of language associated with the Part 11 sizing tables. This was probably a transcription error, in that it makes no sense, is

inconsistent with single appliance note 13, and is contrary to past usage of the tables. This proposal corrects the error. COMMITTEE ACTION: Accept.

COMMITTEE ACTION: Accept. Accept the proposal and correct "maximum" to "minimum" in the

first sentence.

(Log #225) 54- 221 - (11.1 Multiple Appliance Note 7): Accept SUBMrr rER: David S.Jobnston, DSJ Technical Services RECOMMENDATION: Substitute the following text for multiple a~pliance note 7:

Io., gc~z v,.,,t c,,,,,,cc;,,; d:,,~;ccc. The cross-sectional area of the common vent shall be eoual to or gre~ter thall the cr0ss-sectional area of the largest connector. SUI~TANTIA'TION: These proposed changes are in tended to address concerns which have been raised regarding the ambiguity and enforceability of language associated with the Part 11 sizing tahl es.

This proposal restates the requirement in language that is applicable to masonry chimneys as well as vents; rectangular flues as well as round ones. COMMITrEE ACTION: Accept.

(Log #184) 54- 222 - (11.1 Multiple Appliance Vent Note 18): Accept in

- Principle SUBMITrER: Halt Virgil, Carrier Corp. RECOMMENDATION: Revise text as follows:

18. Vent connectors shall no t be up sized more than two sizes greater than the listed appliance categorized vent diameter, flue collar diameter, or draft hood outlet diameter. Vent connectors for draft hood-equipped appliances shall not be smaller than the

' " " ' ' - " • . . . . . ~ - - - " - ~ . . . . . , , ; d r a f t

hood outlet diameter. If a vent colane~tor size(s~ de te rmined from the tables for a fan-assisted aDoliance(s) is smaller than the flue collar diameter, the snmller size(s) may be used orovided:

(a) Vent connectors for fan-assisted annliance ilue collars 12 in. in diameter or smaller are rl0t reduced by'more than one table size (e.~.. 12 in. to 10 in. is a one size reduction) and those larger than ]2 ]'[1. io diameter are riot reduced more than two table sizes (e.g.. 24 in. to 20 in. is a two size reductionL

(b) The lap-assisted appliance(s) is common vented with a draft hood-eauinDed aDoliance(sL SUBST.2~aN~IATIO'N: Deleted text shown as ma'iketiw~. New text is shown as ~ .

VENT-II computations show that ne i ther excessive condensation nor spillage is likely to occur• VENT-II version 4.1a is the Gas Research Institute's computer program for design and analysis of venting systems for gas appliances.

The requirement to common vent fan-assisted appliances with a draft hood-equipped appliance(s) permits dilution air to enter the vent through the draft hood(s) to prevent excessive condensat ion in the vent. COMMITTEE ACTION: Accept in Principle. Accept the proposal and change "may" to "shall be permit ted to"

COMMITTEE STATEMENT: Accept proposal with editorial revisions.

(Log #226) 54-220- (11.1 Multiple Appliance Note 3(b)): Accept SUBMITTER: David &Johns ton , DSJ Technical Services RECOMMENDATION: Revise multiple appliance note $(b) as follows:

For a contractor serving a fan-assisted annliance, the maximum capacity (FAN Min) of the connector shal] be de te rmined by referring to the corresponding single appliance table (Tall,: , 1 I-I m-~-i-i-~. For Type B double wall connectors. Table 11-1 shall be used. For single wall connectors, Table 11-2 shall be used. The height (H~ arid lateral (L~ shall be measured accordin~ to the pro~eduresfor a s!ngle a~;pliancevent. ,~,, d,!s c,~,c, r ~ a c l , .~

~vvA.~,~, ~, ~ ~ , ? , ~ , ~ , , . w , : : , ~ , T,,~ ~y, , . : , .T .~y~. . ,~ . . . . . .

avt~l;o~cc vca~, as if the other appliances were not present. SUBSTANTIATION: These proposed changes are in tended to address concerns which havebeen raised regarding the alnbiguity and enforceability of language associated with the Part 11 sizing tables.

This paragraph has been the source of much confusion among users of the code. This proposal is an a t tempt to restate the same requirements with more readily understandable language.

(Log #CP36) 54- 223 - (11.1 Multiple Appliance Vents): Accept SUBMITTER: National Fuel Gas Code Committee, RECOMMENDATION: Renumber Notes 1 through 22 for multiple appliance vents- Tables 11-6 to 11-10 to 11.3.1 through 11.3.22 and delete "Notes for Multiple Appliance Vent Tables 11-6 through 11- 10" and substitute "11.3 11.2 Additional Requirements to multiple Appliance Vent Tables 11-6 through 11-10." SUBSTANTIATION: Editorial. COMMITTEE ACTION: Accept.

(Log #224) 54- 224 - (11.1 Single Appliance Note 10; Multiple Appliance Note 17): Accept in Principle SUBMITrER: David S.Johnston, DSJ Technical Services RECOMMENDATION: Delete the indicated text from single aFoPliance note 10, and multiple appliance note 17:

• The tables included in this Part shall be used for chimneys and x e ~ not e~po~ed, t? ~ou~doo~ be!,ow the~oof ,ine: c!::.:.:~.o o ,

857

NFPA 54 - - A96 R O P

~ v t * ~alauvuol. ~ V L J ~ t * ~ U ~ L * , ~ . ~ ~ ~" ~ t J ~ L J ~ vi i . J v ~ l ~ 7 . ~VLIOULL~ ~ l ~ l

~ud,~,~ty i,~d,,~ju,~odlcG . . . . A Type B vent or listed chimney lining system passing through an unused masonry chimney flue shall not be cons idered to be exposed to the outdoors. SUBSTANTIATION: These proposed changes are in tended to address concerns which have been raised regarding the ambiguity and enforceability of language associated with the Part 11 sizing ta191es.

The language to be deleted does not state a meaningful requirement and serves only to muddle the determinat ion of acceptable venting systems. The first deleted sentence does not indicate what localities might have this problem. The second sentence tells the authority having jurisdiction to consult himself, and gives not criteria on which a local evaluation should be based. Finally, the language does not require any action other than "consultation"; presumably, after one "consults" one could do whatever one wantsl

If the values in the tables are appropriate only for cl'dmneys and vents not exposed below the roof lines then the first sentence of the Note is all that is needed; it is clear that exterior chimneys and vents SHALL NOT be sized according to these tables. Unless and until a basis is available to provide mandatory sizing for exterior chimneys, the issue should not be addressed in anything but enforceable language. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: Refer to Committee Action on Proposal 54-209 (Log #197).

(Log #221) 54- 225 - (11.1 Single Appliance Note 3 and Multiple Appliance Note 6): Accept SUBMIT'rER: David S. Johnston, DSJ Technical Services RECOMMENDATION: For both single appliance note 3 and multiple appliance note 6, delete the NOTE and add the following to the end of the paragraph.

"Two or more turns, the combined anules of which euual 90 deurees, shall be considered etmivalent~to one 90 detrr~e turn." SUBSTANTIATION: These p?oposed changes are i~tended to address concerns whi/:h have been raised regard ing the ambiguity and enforceability of language associated with the Part 11 sizing tables.

There is often question as to whether or not language included in a separate NOTE is mandatory or merely advisory. This proposal removes any doubt by putting the language with the rest of the requirement and restating it with mandatory phrases.

This proposal also makes tim determinat ion of equivalency universal and unambiguous by stating explicitly that it applies to any combination of turns that adds up to 90 degrees. COMMITTEE ACTION: Accept.

(Log #222) 54- 226 - (11.1 Single Appliance Note 6, Tables 11-3, 11-4, 11-5): Accept SUBMITTER: David S. Johnston, DSJ Technical Services RECOMMENDATION: 1. Delete the asterisks from Tables 11-3, 11- 4, 11-5.

2. Delete single appliance Note 6. SUBSTANTIATION: These proposed changes are in tended to address concerns which have b e e n raised regarding the ambiguity and enforceability of langamge assodated with the Part 11 sizing tables.

The asterisks and associated Note do not indicate a meaningful requi rement and tend to muddle the determinat ion of acceptable chimney and vent sizes. The admoni t ion to consult the local gas supplier or authority having jurisdiction is circular: ff this is mean t to be a CODE, to be enforced by an authority having jurisdiction, this language simply refers him to himselfl The provision also provides no criteria upon which a local evaluation is to be made, and thus no basis for determining acceptability. Finally, the language does not require any action other than "consultation"; presumably, after one "consults" one could do whatever one wantsl

ff tile sizing tables are to be an enforceable part of the code they must provide absolute, measurable, and unambiguous minimums and maximums. The asterisks introduce a gray area that shays "maybe dais size is OK, maybe not". ff the scientific analysis upon which the values in the tables are based has de te rmined that the given values are acceptable for tile assumed conditions, then this must be stated unambiguously. If there are circumstances under which tile values do no t apply, or need to be adjusted, those

circumstances must be delineated clearly, and the me thod of adjustment of the values provided. If such circumstances cannot be defined, then the values in question need to be deleted, such that the tables contain only clearly acceptable values.

I have suggested retaining the asterisked values, and eliminating the asterisks, because these values were included (without asterisks) in the original GRI proposal in the 1992 cycle. Presumably the GRI analysis had de te rmined that these values were acceptable under the environmental conditions assumed for the analysis of all vent systems. COMMITTEE ACTION: Accept. Accept and delete " * See Note 6" at tile bottom of Table 11-3, 114

and 11-5.

(Log #223) 54- 227 - (11.1 Single Appliance Note 8; Multiple Appliance Note 15): Accept in Principle SUBMITTER: David S. Johnston, DSJ Technical Services RECOMMENDATION: 1. Revise the last sentence of single appliance Note 8 to read:

Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity additionally reduced. ( , ~ Nvtc

accordin~ to Note 3. 2. Revise ~ e last sentence of multiple appliance Note 15 to read: Corrugated metallic liner systems installed with bends or offsets

, ~ ,~h ~ ~d~G,; ; ,d , c d , cd,~. ~f tl,~ ,cu t .;.aad,,,~;;, ca~,~dZy shall have their maximum capacity additionally reduced. (S,:~ I',Gz~ ~) accordin~ to Note 6. SUBSTA]~TIATION: These proposed changes are in tended to address concerns which havebeen raised regarding the ambiguity and enforceability of language associated with Part 11 sizing tables.

Words in parenthesis tend to create doubts about the mandatory nature of what's inside. Since it is clear that the intent is to have die capacity of the liner reduced according to the procedure in the referenced notes, that should be explicitly stated. COMMITTEE ACTION: Accept in Principle.

Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity further reduced in accordance with Note 3.

Revise the last sentence of multiple appliance note 15 to read: Corrugated metallic liner systems installed with bends or offsets

shall have their maximum capacity fur ther reduced in accordance with Note 6. COMMITTEE STATEMENT: Accept proposal with editorial revisions.

(Log #CP35) 54- 228 - (11.1 Notes to Single Appliance Vent Tables 11-1 through 11-5): Accept SUBMITTER: National Fuel Gas Code Colmnittee, RECOMMENDATION: Revise Notes to Single Appliance Vent Tables 11-1 through 11-5 to read:

"11.2 Additional Requirements to Single Appliance Vent Tables 11- 1 through 11-5" and renumber the notes 11.2.1 through 11.2.14 SUBSTANTIATION: Editorial. COMMITTEE ACTION: Accept.

(Log #196) 54- 229 - (11.1 Exterior Masonry Chimneys (New)): Accept SUBMITTER: Allen L. Rutz, Battelle RECOMMENDATION: Add the following definition:

11. Exterior Masonry Chimneys. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. SUBSTANTIATION: This definition clarifies the use of the venting notes addressing exterior masonry chimneys (single appliance venting note 10 and mult ipleappl iance venting note 17). COMMITrEE ACTION: Accept.

(Log #106) 54- 230 - (A.2.f.2(d) and A.2.0.3(b)): Accept SUBMITTERa William S. Bigelow, Maplewood, NJ

i RECOMMENDATION: Change the text of A.2.f.2(d) to read, in part, as follows:

"A.2.6.2(d) ~ An average of 0.3 ~rains of hvdroaen sulfide per 100 standard cu f t (0.7 mg ~er 100L)is equivalent to a trace as de te rmined b y . . . "

858

NFPA 54 -- A96 ROP

Change the text of A.2..O.3(b) to read as follows: A.2.O.3(b) See A.2.6.2(d). ,%, . . . . ,,go . . . . % ' , '3 I / ,~TM D2428.

SUBSTANTIATION: ] 'he added wording in A.2.6.2(d) will refer you back to the text of the cited section and will make the code more usable, etc. The change in A.2.6.3(b) is serf-explanatory. COMMITI 'EE ACTION: Accept,

(Log #186) 54- 231 - (Figure A.7.12.4): Reject SUBMITTER: David P. Kirschner, Kirschner Associates, Inco RECOMMENDATION: Revise Figure A-7.12.4 as follows:

SUBSTANTIATION: ff a barometr ic d a m p e r is installed on ei ther a fan-assisted or forced draft gas-fired water hea te r or boiler, as shown in Figure A.7.12.4, there will be a build-up of pressure where the vent f rom the hea te r /bo i l e r bul lheads into the 'T ' . This pressure build-up will cause flue gas to spill into the room th rough the barometr ic damper . The flue ~ will t end to follow the pa th of least resistance, whicla is t h rough the damper . Even in a negative stack situation, because of the bullhead, you will get flue gas spilling into the room. This will in t roduce hazardous amoun t s of carbon monox ide into the room. COMMITTEE ACTION: Reject. COMM]TI'EE STATEMENT: The figure shows examples for generally accepted installations of barometr ic dampers for stabilizing draft and prevent ing backdraft f rom affecting appl iance performance.

4~

\ /

/ ~ j ~ ~ Chimney

R~ius 2 - 45"

FDO IT THIS WAY

I f rm the T ~ i f i c Boiler Ioutlet flue to the verti~l ]chi~ey.to avoid pulsing

Boiler Y I

Bar~etric

NOT THIS WAY ! i's-~-t~t o~t~ tronsition

and while a cleanout ~ . sound lil ~ o good ideo, R wmll

m t i ~ VENTGI

VENTING l t { I}t3~IFIC GAS-FIRED BOILER KIRSOI~ ASSOCIATES, INC. iliddlebor h. 14A, 02.346 J.ly a,

b i l ~ /

DO NOT DO THIS

V E N T I N G HAZARD P-K Thermific Gos Fired Boiler

Tee

/

-"1 II I IThis is . viol.tion of the LAW" I C~ land =ill result in carbustion I .-- ]9~s fu~, whi~ contain Carbon ]

I11 .. I I~oxide (o Je l l colorless, I - I P l o o ~ r l ~ ~ ) , le~ing into the I

q) | e q U i l ~ e n t r °~ l , ~ [ VFNTr~2 i i i i i i i i i i

KIRSOI, ER ASSOCIATES, INC. j I/iddl~oucjh, MA 02346 Juq s, ~ , I

859

N F P A 54 - - A 9 6 R O P

(Log #146) 54- 2 3 2 - ( A p p e n d i x C, Exhibit 1, (3)): Accept SUBMITTER: Ernest F. Parent, Columbia Gas of Ohio, Inc. RECOMMENDATION: Section 3 should read: "Section 3, supplying outlets A, B, C and D, or 244 cfl~ (6.8 m~/hr) , requires 1 in. pipe." SUBSTANTIATION: Outle t D omit ted ira example. C O M M I T r E E ACTION: Accept.

many cases the increments between n u m b e r drill sizes are too large, and use of metr ic drill sizes he lp narrow the increments . COMMITTEE ACTION: Reject. C O M M I T r E E STATEMENT: A specific proposal is not made. It is no t clear if the existing sizes should be converted to m m or i f a new table of true metric sizes is requested.

(Log #190) 54- 233 - (Appendix D (b).l and (b).2): Accept SUBMITTER: Bruce.]. Swiecicki, National Propane Gas Association RECOMMENDATION: Revise Appendix D (b). l and (b).2 of NFPA 54 to read as follows, with addi t ions no ted in under l ine and delet ions no ted in s~ik-tmnw.

"(b) Test ing for Leakage no t Using a Meter. 1. For any gas system: By a t taching to an appropria te checkpoin t a m a n o m e t e r or

equivalent device ~d~b,,,tcd s,, d,at it c,~,~ b,. ~cad ~,~ ~aci c;;,c,J~, ,,f , , . t ,,,+c~ ~ , a . 2 v . . . . . . ; v~; vvc'- f ic '~, o-z~t~,;, v . c ~ . c between the inlet to the piping system and the first regulator ..,

2. For gas systems using undi lu ted liquefied pe t ro leum gas: (ii) For systems serving appl iances tha t receive gas at pressures of

1 /2 psig (3.5 kPa gauge) or less, by insert ing a water m a n o m e t e r or equivalent device ,.~l~l~,~t-d o.. d,at K c ~ , b,. i cad ~,, :u,., c; : ,c, .~ 6f ,,,,t a~,,;c if, a , . . I i,,. (25 pa) ;;at~, c~ lu ,~ , into the system down- s t ream of the final system regulator . . . . " SUBSTANTIATION: T he inclusion of the 0.1 in. water co lumn gage graduat ions was inadver tent and e r roneous when done for the 1992 edit ion of NFPA 54. This 0.1 in. water co lumn gradua ted spring gauge is no t common l y available a n d such accuracy is no t required for safety. This proposal recognizes those facts. C O M M I T r E E ACTION: Accept.

(Log #180) 54- 234- (Table F-l): Reject SUBMITrER: RichardJ . Hanna , Bard Manufac tur ing Company RECOMMENDATION: 1. Add a new note to Table F-l, "Btu/ft* = 1000"

2. Add a new Tabel F-6:

Table F-6 Multiplirs for Utility Gas B tu / cu ft Content

B ~ / c u ft _M_~l i e r

800 0,800 825 0.825 850 0.850 875 0.875 900 0.900 925 0.925 950 0.950 975 0.975 1000 1.000 1025 1.025 1050 1.050 1075 1.075 1100 1.100

SUBSTANTIATION: Existing Table F-1 is presently calculated on basis of 1000 B t u / c u ft, bu t is no t stated as such.

Proposed Table F-6 multipliers permits correction for different hea t ing values of fuel supply. C O M M I T r E E ACTION: Reject. C O M M I T r E E STATEMENT: The hea t ing value o f the gas is irrelevant in flow calculation.

(Log #179) 54-235- (Tables F-l, F-2, F4): Reject SUBMITTER: RichardJ. Hanna, Bard Manufac tur ing C o m p a n y RECOMMENDATION: Integrate metr ic drill sizes a long with n u m b e r drill sizes in Tables F-l, F-2, F-4. SUBSTANTIATION: Many appliances are now des igned us ing metr ic drill size orifices, or a combina t ion of metric and n u m b e r drill size orifices to closer match rated inpu t of the appliances. In

(Log #178) 54-236 - (Tables F-I, F-2, F-4): Reject SUBMITrER: RichardJ. Hanna , Bard Manufactur ing Company RECOMMENDATION: Add new Table F-5, multipliers for orifices of ano the r orifice coefficient.

Table F-5 Multipliers for Orif ices o f Another Orifice Coefficient

Orifice Coefficient

0.80 0.889 0.81 0.900 0.82 0.911 0.83 0.922 0.84 0.933 0.85 0.944 0.86 0.955 0.87 0.966 0.88 0.977 0.89 0.988 0.90 1.000

SUBSTANTIATION: Present Tables F-l, F-2 and F-4 are based on orifice coefficient of 0.90 which is no t representat ive of orifices typically used, thus indicat ing capacities in excess of actual orifice per formance . Figures 12-114 in Gas Engineers Handbo ok, 1st edition, indicates orifice coefficients in range of 0.81-0.83 for typical orifice designs.

Proposed Table F-5 multipliers would allow the necessary correction for various orifice coefficients. This would be t h e simplest upda te without regenera t ing the existing tables, however the best direct ion would be to change Tables F-l, F-2, and F-4 to reflect orifices used in typical equ ipmen t such as 0.81. The multiplier table is still n e e d e d by" adjusted so tha t 0.81 coefficient=l.00. C O M M ] T r E E ACTION: Reject. COMMITTEE STATEMENT: The substant iat ion is no t sufficient to change the Code. No indication that a real problem exists is presented.

(Log #200) 54- 237 - (Appendix G): Accept in Principle SUBMITTER: Allen L. Rutz, Battelle RECOMMENDATION: Add the following example case.

Example 5c: C o m m o n Vent ing Into an Exterior Masonry Chimney In this case, the water hea te r and fan-assisted furnace of Examples

5a and 5b are to be c o m m o n vented into an exterior masonry chimney. The ch imney height , clay tile l iner dimensions, and vent connector heights and laterals are the same as in Example 5b. This system is being installed in Charlotte, Nor th Carolina. Does this exterior masonry chirmiey need to be relined? ff so, what corrugated metallic liner size is r e commended? Wha t ven t connector diameters are r e commended?

Solution According to Note 17, Type B vent connectors are requi red to be

used with exterior masonry chimneys. Table 11-13 to size FAN+NAT c o m m o n vent ing installations involving Type-B double wall connectors into exterior masonry chimneys.

The local 99-percent winter design tempera ture need ed to use Table 11-13 can be found in ASHRAE Handbook- Fundamenta ls . For Charlotte, North Carolina, this design t empera tu re is 19 F.

Ch imney Reliner Requi rement . As in Example 5b, use the 63 square inches Internal Area co lumns for this size clay tile liner. Read down the 63 square inches co lumn of Table 11-13a to the 30- foot he igh t row to f ind tha t the Combined Appliance M a x i m u m Input is747,000 Btu per hour . The combined inpu t rating of the appliances in this installation, 135,000 Btu per hour , is less than the m a x i m u m value, so this criterion is satisfied. Table l l -13b, at a 19 F Design Tempera ture , and at the same Vent Height a n d Internal

860

N F P A 5 4 - - A 9 6 R O P

Area used above, shows that the minimum allowable input rating of a space-heating appliance is 470,000 Btu per hour. The furnace input rating oflO0,000 Btu per hour is less than this minimum value. So this criterion ~s no t satisfied, and an alternative venting design needs to be used, such as a listed chimney lining system.

According to Note 16, Tables 11-6 or 11-7 are used for sizing corrugatedmetaUic liners in masonry chimneys, with the maximum common vent capacities reduced by20 percent. This example will be cont inued assuming 'Type B vent connectors. Water Heater Vent Connector Diameter. Using Table 11-6, Vent

Connector Capacity, read down the Total Vent Height (H) column to 30 feet, and-readacross the 2-foot Connector Rise (R) row to the first Btu per hour rating in the NAT Max column that is equal to or greater than the water fieater input rating. The table shows that a 3- inch vent connector has a maximum capacity of 39,000 Btu per hour. So the 35,000 Btu per hour water heater in this example can use a 3-inch connector.

Furnace Vent Connector Diameter. Using Table 11-6, Vent Connector Capacity, read down the Total Vent Height (H) column to 30 feet, a n d r e a d a c r o s s the 3-foot Connector Rise (R) row to the first B tupe r hour rating in the FAN Max column that is equal to or greater than the furnace input rating. The table shows that a + inch vent connector has a maximum capacity of 123,000 Btu per hour, and a minimum input rating (FAN Min) capacity of 123,000 Btu per hour, and a minimum input rating (FAN Min) of 34,000 Btu per hour. The 100,000 Btu 15er hour furnace in this example fallg within dais range, so a + inch connector is adequate.

Chimney Liner Diameter. The total iriput to the common vent is 135,000 Btu per bour. Using the Common Vent Capacity Portion of Table 11-7, read down the T-otal Vent Height (H) column to 30-feet and across this row to f ind the smallest vent diameter in the FAN+NAT column that has a Btu per hour rating greater than 135,000 Btu per hour. The + inch common vent has a capacity of 138,000 Btu per hour. Reducing the maximum capacity for a + inch corrugated hner of 110,000 Btu per hour, less than the total input of 135,000 Btu per hour. So a largtr liner is needed. The 5-inch - common vent capacity listed in~l'able 11-6 is 210,000 Btu per hour. Therefore, a 5-in-ch corrngated metal liner should be used in this example. Single Wall Connec tors Once it has been established that relining

the chimney is necessary, Type B double wail vent connectors are not specifically required. Ttiis example could be redone using Table 11-7, for sing le wall v e n t . . ,-onnectors._ For this case, the vent connector and liner dianleters would be the same as found above with Type B double walt connectors. SUBSTANTIATION: An exterior masonry chimney example case is added to demonstrate die use of the proposed exterior masonry chirmaey tables. COMMITTEE ACTION: Accept in Principle. Accept proposal but revise last sentence under "Chimney Liner

Requirement" to read: "So dais criterion is not satisfied, and an alternative venting design

needs to be used, such as a Type B vent shown in Example 5 A or-a listed chimney liner system shown in the remainder of the example." COMMITTEE STATEMI[hNT: Accept proposal with modifications.

COMMITTEE STATEMENT: The intent of the proposal is accepted.

(Log #97) 5+ 240- (Figure G-11 and G-12): Reject Note: This proposal appeared as comment 54442 which was held

for further study from the Annual 92 TCD, which was on proposal 54-18. SUBMITTER: W. Herber t Dot,/, Minnegasco RECOMMENDATION: Add to the instructions: Warning:. Do no t use multi-story gas vent system, if connected

appliancbs use open draft hoods, where spillage could cause a hazardous condition. SUBSTANTIATION: f fa blockage occurs in an upper section of common vent, lower appliances ~ l l vent out of up-p-er level open draft hoods. (This is f fdocumented condition with fatal results.) COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Already addressed under 7.6.4. of the Code.

(Log #149) 5+ 241 - (Appendix I): Accept SUBMITIqgR: Dirk N. Granberg, PVI Industries, Inc. RECOMMENDATION: Delete the phrase "on Existing Appliances" in the title in favor of "in Existing Vents". Also, delete the phrase "on an existing appliance" in favor of "in

the vent servingan existing appliance". - - SUBSTANTIATION: Many l~eople still confuse the terms vent and flue. Vent dampers listed for installation in existingvents are in tended to reduce the buoyant flow of conditionei!l room air to the outside, not to reduce the buoyant flow of heated air from an appliance flue outlet to the outside.

If a damper device is used to block the flue outlet of an appliance to help re-duce standby losses, it must be certified as part o~-the appliance bya safety certification and listing a~ency. COMMITTEE ACTION: Accept. ~

(Log #150) 5+ 242 - (AppendixD: Accept SUBMITTER: Dirk'N. Granberg, PVI Industries, Inc. RECOMMENDATION: Delete the phrase "on Existing Appliances" in the title in favor of "in Existing Vents ' .

Also, delete the phrase "on an existing appliance" in favor of "in the vent serving an existing appliance". - - SUBSTANTIATION: Many 15eople still confuse the terms vent and flue. Vent dampers listed fofins-tallation in existingvents are in tended to reduce the buoyant flow of condi t ioned room air to the outside, not to reduce the buoyant flow of heated air from an appliance flue outlet to the outside.

I r a damper device is used to block the flue outlet of an appliance to help reduce standby losses, it must be certified as part oi" the appliance bya safety certification and listing agency. COMMITTEE ACTION: Accept. - -

(Log #126) 5+ 238- (Table G-l): Reject SUBMITTER: Russel Iwasa, Metropolitan Utilities District RECOMMENDATION: DELETE: Table G-1 Masonry Chimney Linear Dimensions with Circular Equivalents. SUBSTANTIATION: Replace exisung table with the following, which is developed from ASTM C-315. (Table on the following page.) COMMITTEE ACTION: Reject. COMMITTEE STATEMFaNIT: The committee believes that the PwrOposed revisions to the table would not provide minimum sizes

hi~zh are necessary for proper liner selection.

(Log #157) 5+ 239 - (Figure G-11): Accept in Principle SUBMITTER: FredNguyen,PSE&G RECOMMENDATION: 1. Diagram shows "L3", it should be "Lo" "See note 5" as in all other diagrams.

2. First line of legend is inappropriate; simply specify the SI value in parenthesis after dimensions example "+in. (IO cm)"

3_ It is not clear where "(See Note-4)" and "notes for common venting" are located in the code. SUBSTANTIATION: Clarity and consistency. COMMITTEE ACTION: Accept in Principle.

1. Delete "Lo" and "L~" and substitute "L M" 2. Delete the first line of the legend and insert metric conversions

in the text. 3. Refer to Committee Action on Proposals 5+228 (Log #CP35)

and 54-89 (Log #36). 4. Revise Note 4 in the Ivlultiple Appl. by substi tut ing" LM" fo r "

LO".

861

(Log #151) 5+ 243 - (Appendix K): Accept SUBMITTER: Dirk N. Granberg, PVI Ind~tr ies , Inc. RECOMMENDATION: Delete the ph rase ' on Existing Appliances" in the title in favor of" in Existing Vents". Also, delete the phrase "on an existing appliance" in favor of "in

the vent serving an existing appliance". SUBSTANTIATION: Man-}, p-e-ople still confuse the terms vent and flue. Vent dampers listed for installation in existingvents are in tended to reduce the buoyant flow of condi t ioned room air to the outside, no t to reduce the buoyant flow of heated air from an appliance flue outlet to the outside.

ff a damper device is used to block the flue outlet of an appliance to help reduce standby losses, it must be certified as part of the appliance bya safety certification and listingagency. COMMITrEE ACTION: Accept.

(Log #199) 54- 244- (L.1.4): Reject SUBMITTER: Allen L. Rutz, Battelle RECOMMENDATION: Add the followingreference.

"ASHRAE Handbook-Fundamentals, 1993" SUBSTANTIATION: This publication is referenced in the proopoosed revisions to Note. 10 of the. single .pa pliance venting tables, and Note 17 of the muluple apphance venting tables. COMMITrEE ACTION:-Re i~ct. COMMITTEE STATEMENT: Appendix L is a compendium of references located in the other appendices. Proposals emmot be accepted to add references to this-Appendix. -

N F P A 54 - - A96 R O P

Round Size I.D.

3 Metal

4 M e ~ 5 Metal

6 Metal 6 Tile

Masonry Chimney Liner and Vent Connector Dimensions

Standard Modular Liners Wall Thickness * Inside Liners Dimensions

26 Ga. 3 4 x 8 1/2 2 1 / 2 x 6 1/2

7 Metal 8 Tile 8 Metal

9 Metal

10 Tile

12 Tile

I W m

b'l[i~,

4 x 1 6 8 x 8

I 24 Ga.

I I I

~/8 24 Ga.

I 24 Ga.

I

2 x 1 4

3 l / 4 x 11 3 /4 7

8 7 1 /4 x 7 1 /4

24 Ga. 9 7 /8 5 3 /4 x 13 3 /4 718 ]0 3 /4 7 x 11 1/2 7 /8 9 3 /4 x 9 3 /4 7 /8 6 3 /4 x 16 1 /4 1.0 12

I ~ l K ! I ' ~ n K I I ' |

8 x 1 6

8 1/2 x 13 12 x 12

8 1 /2 x 18

13x 13 1 2 x 1 6

1 6 x 1 6

======================== i - - - : . : : . : : :~ . ; :N ' } . : - ' . : : i : i - - : . . . - , . . . - . - . . . - . . . . . . , , , . o . . . , , , . , . • , , , , . • . . , . . . . . . . . . . . . . . :::::::::::::::::::::::::::::::::::::::::::::::

, ~ , . . . . . ,:.:,:.:.:.:.:;:; - . :::;: :::;: :;: :: : : : : : : :::l:~::::: ::::: ::::: =================================== : ; : ; : ; : ; : i : ; : ; : ' : ;~: ; : ; : i : ; : ; : ; : ; : i : ::::::::::::::::::::::::::::::::::::

:::::::::::::::::::::::::::::::...-,, :::::::::::::::::::::::::::::::::::: : . : . : , : , : , : . : . : . : .38: . : . : . : . : . : . : : : . :~ i i i i . . . . . . . . . . . . . . . . =================================== ::::::::::::::::::::::::::::::::::::: ::::::::::::::::::::::::::::::::::: :::::::::::::::::::::::::::::::::::: ==================================== . : . : . : . : . : . : . : . : . z ~ . : . : . : . : . : . : S : ,

::::::::::::::::::::::::::::::::::: ;:;:.:-:-:;:;:+8,T,;:.:.:.:;:;:.:.: : : : : : : :: :~I):~ :;:;: :i: :;:;: ==================================

7 Times Round Area

49

88 137

198

269

352

445

::::::::::::::::::::::::::::::::::: ;:;:;:;:;:;:.:;I,~,~:;:;:;~;:;:;:;:;

:::::::::::::::::::::::::::::::::::: 13 x 18 7/8 11 1 /4 x 16 1 /4 ::::::::::::::::::::::::::::::::::

* Locate the tile liner size on the left [1ted column. This value is applied to the masonry chimney vent tables V~ 11.8 11.9 11.10. 1 Maximum chimney area for this connector

CLAY FLUE LININGS

hOUND

t ~ O t ~ , . I | A L O I u l ~ . | I | IC.~ i I i ' I l [ f 4 1 0 1 ~ IDJAI .~ I~ T I [ I q I

!

r ~ ~

STANDARD 1 IL~ODUI All

A C ; L l i l . UIP. lk~ ! f ~ , ~ l ,

; ' 6 '

~ 1,3P , . i / . i t ' . u . , r f i ~ . ~ l i

il

i I

C~ , l s t t ~ h , ~ l U | I t , , t h , . , , ~ J , . l l t , i . . I .

1~1 tJ i ,ner~ t i lH I C01fCtO.~f t ,h, . . ~ ' . 1 , . . . . . . . . . . I ..

Liner Sizing Guide

* Round - Nominal flue size for round flues is interior diameter. * Standard - Nominal flue size for standard (non-modular) rectangular flues is outside dimensions. * Modular - Nominal dimensions for modular flue linings are outside dimensions plus 1/2 in.

862

N F P A 54 - - A 9 6 R O P

This page shows only the portions of NFPA 54 as changed by the actions on proposals on pages 812 through 862, pr inted as an aid to the reviewer.

NFPA54 (ANSI Z223.1) [1.6.2 Handl ing o f Flammable Liquids. Unchanged . ]

National Fuel Gas Code 1.7 Def'mitions.

1996 Edition

This draft shows those parts of the Code affected by accepted proposals, with the changes shown as ~ (under l ined) and dt-te-tier~ (strikethru). Editorial revisions are also shown here, and similar editorial revisions will be made to provisions no t shown here. The official act ions of the Commit tee are f o u n d in the proposals. This draf t is for the convenience of the reviewer and is no t official.

Part 1 General

1.1 Scope.

1.1.1(a)

1. Coverage of piping systems shall ex tend f rom the point of delivery to the connect ions with each gas utilization device. For o ther than undi lu ted lkluefied pe t ro leum gas systems, the point of delivery shall be considered the outlet of the service mete r assembly, or the outlet of the service regulator or service shutoffwalve wh~-rr

no mete r is provided. For undi lu ted liquefied pe t ro leum gas systems, the po in t of delivery shall be considered the outlet of the

final pressure ;~g~l~t+.. , egulator, exclusive of line regulators, in the system~

[2 th rough 17 Unchanged . ]

18. Fuel gas systems on recreational vehicles manufac tu red in accordance with NFPA 501C. Standard for Recreational Vehicles.

[ 1.1.2 Othe r Standards. Unchanged . ]

[1.2 and 1.3 Unchanged . ]

1.4 Qual i f ied Agency. Installation tes.~_LC.Lfi.tlg, a n d rep lacement of gas pipin, g, gas utilization, equ ipment , or accessories, and repair, and serwcmg of equipment , shall be pe r fo rmed only by a qualified agency. The te rm "qualified agency" tin-arts shall mean any individual, firm, corporation, or company that ei ther in person or t h rough a representative is engaged in and is responsible for (a) the installation~,e_s_fi__n_ng~ or rep lacement of gas piping or (b) the connect ion, installation, ~ repair, or servicing of equipment ; that is exper ienced in such work: ~ a t is familiar with all precaut ions required, and that has compl ied with all the requi rements of the authori ty having jurisdiction.

1.5 Interruption of Service.

1.5.1 Notification o f In te r rup ted Service. h - W h e n the gas suoolv is to be tu rned off, it shall be the duty of the qualified ,~gc~c~, ,;;,~_,] d-,c ~5o~ zaf't'"Y ~ ;-" Lc t,,i~c,.l' vff, a_gglL~ to notify all affected users.

Where two or more users are served f rom the same supply system, precaut ions shall be exercised to assm'e ensure that ~ service to the proper user is t u rned off.

Exception: In cases of emergency, affected users shall be notified as soon as possible of the act ions taken by the qualified agency.

1.5.2 Before Turn ing G-'ts Off . Before za, ,~.',,g ,,ff the gas off to the premises, or section of piping to be serviced, for the purpose of installation, repair, replacement , or ma in tenance of gas piping or gas utilization equ ipment , all e q u i p m e n t shutoffvalves shall be t u rned off.

A leakage test shall be per formed to de te rmine tha t all equ ipmen t is t u rned off in the piping section t ~ b e affected.

NOTE: See Appendix D for a m e t h o d of leakage testing.

[ 1.5.3 and 1.5.4 Uncl~anged.]

1.6 Prevention of Accidental Ignition.

1.6.1 Potential Ignition Sources. Where workirrgwork is being oe r fo rmed on piping tha t contains or has conta ined gas:

NOTE: The following defint ions are revised:

A~encv, Ouallfied. See 1.4.

Air Conditioner. Gas-Eired. A c, as-burninm automatically operated anol iance for sunnlving cooled ~ n d / o r dehumid i f i ed air o r chil led l~.q~uid. " " "

Anodeless Riser. A transit ion assembly where Mastic hiding is oermi t ted to be installed and te rmina ted above'ground outside of a building. The plastic t)ining is p iped f rom belo~v grade to an a b o v e ~ o u n d location'ifisid~ a orotective steel casing and terminates in eitffer a factory-assembled tr~msition fittin~ or a fi~ld-assembled. service head. adapter-type transit ion fitting.

Aonliance Categorized Vent Diameter /Area . The m i n i m u m vent diarrneter/area ffermissible for Category. I apoliances to mainta in a nonnosifive vent static nressure when t e s t ed ln accordance with a nationally recomaized standard.

v

................... r e ...... "2 ......... ;~" vT, ........ ; .........

~"t -w, ~'.f'~. An allov consisting generallv of i ron and carbon. Th e accomnanving e lements contait~e~d therein usuallv consist of silicon. man~aiaese, sfiffur and nhosnhorus . The oresenc'e of o ther e l e m e n ~ may define a low alloy steel, which would have significantly different properties than a plain carbon steel.

Deskm Certification. The nrocess bv which a n r0duc t is evaluated and t~sted bv an indeoende 'n t laboratorv to a£flrm that the oroduct design comolies with soecific reouirements .

Draft Hood. A nonadjus table device built into an appliance, or made a part of the vent connector f rom an appliance, that is des igned to (1) provide for the ready escape of the flue gases f rom the appliance in the event of no draft, backdraft, or s toppage beyond the draft hood, (2) prevent a backdraft f rom enter ing the ca}~pliance, and (3) neutralize the effect of stack action of the

imney or gas vent u p o n the operat ion of the appliance.

Heat Pumn. Gas-Fired. A ~as-burninm automatically ooerated anoliance fitilizin~ a refrige~ration system for supplying either heated air 'or liauid, or hea ted an-d/or cooled air or liquid.

Household Cooking Gas Appliance. A gas appliance for domest ic food preparat ion, providing at least one func t ion of (1) top or surface cooking, (2) oven cooking, or (3) broiling.

(a) Broiler. A unit that cooks primarily by radiated heat.

(b) Built-In Unit. A un i t des igned to be recessed into, placed upon, or a t tached to the construct ion of a building, but not for installation on tbe floor.

(c) Floor ~ Suppor ted Unit. A self-contained cooking appliance for installation directly on the floor. It has a top section and an oven section. It may have additional sections.

Service Head Adamer . A transition fittin~ for use with nlastic piping (which is eficased in non-pressure-~arrving metal 'pipe) that connects the metal nine casing and nlastic nine and tubing to the remainder of the nioing system.

[(a) t h rough (d) Unchanged . ]

863

N F P A 54 - - A 9 6 R O P

This page shows only the portions of NFPA 54 as changed by the actions on proposals on pages 812 through 862, printed as an aid to the reviewer.

Part 2 Gas Piping System Design, Materials, and Components

2.1 Piping Plan.

[2.1.1 Installation of Piping System. Unchanged.]

2.1.2 Addition to Existing System. When ~,,~.,.,.,~c~,,~ additional gas utilization equipment is bein~ connected to a gas piping system, the existing piping shall be checked to determine if it has adequate capacity (see 2.4.3). If inadequate, the existing system shall be enlarged as required, or separate gas piping of adequate capacity shall be provided.

[2.2 through 2.5 Unchanged.]

[2.6 Acceptable Piping Materials and Joining Methods. Un- cbanged.]

{2.6.1 through 2.6.3 Unchanged.]

2.6.4 Plastic Pipe, Tubing, and Fittings. Plasdc pipe, tubing, and fittings shall be used outside underground only and shall conform with Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings, ASTM D2513. Pipe to be used shall be marked "gas" and "ASTM D2513."

Anodeless risers shall comply with the followinff:

(a) Factory-assembled anodeless risers shall be recommended for the was used and shall be leak tested bv the manufacturer in acco~rdatace wid~ written nrocedures.

(h) Service head adapters and field-assembled anodeless risers incornoratin~ service l{ead adanters shall be recommended for the gas used by t~e manufacturer and shall be desi~rn certified to meet die requirements of Category I of ASTM D251 3. and U.S. Deoart- meBt of Transport~atioo. Code of Federal Re,relations. Title 49. Part 192.281 (e'). The manufacturer shall nrovide'the user oualifled installation instructions as nrescribed bv U.S. Deoartn{ent of Transnortation. Code of Federal Recmlation. Title 49. Part 192.283(bl.

The use of plastic pipe, ~ ~ a n d fittings in undiluted liquefied petroleum gas piping systems shall be in accordance with Standard for the Storage and Handling of Liquefied Petroleum Gases, NFPA 58.

[2.6.5 through 2.6.7 Unclaanged.]

[Table 1 Unchanged.]

I2.6.8 Metallic Piping Joints and Fittings. Unchanged.]

[(a) through (d)8 Unchanged.]

9. Special Fittings. Fittings such as couplings, t,, ;,t,i ~ct,~ y z~r~ proprietary-typeioints, saddle tees, gland-type compression fittings, flared, flareless, or c,,,nv, c~;,,,, ~)t.,c compression-type tubing fittings may-shall be oerrnitted to be used provided they are (1) used within the fitting mahufacturers' pressure-temperature recommendations; (2) used within the service conditions anticipated with respect to vibration, fatigue, thermal expansion, or contraction; (3) installed or braced to prevent separation of the joint hygas pressure or external physical damage; and (4) acceptable to the authority having jurisdiction.

[2.6.9 through 2.6.11 Unchanged.]

I2.7 Gas Meters. Unchanged.]

[2.8 Gas Pressure Regulators. Unchanged.]


2.8.4 Venting.

(a) Line Gas Pressure R ~ i , t , , , o! I,,d~d~,,~s ,7, . . . . . d Gta~ 12-C,~ Regulators.

I. An independent vent to the outside of the building, sized in accordance with the regulator manufacturer's instructions, shall be provided where the location of a regulator is such that a ruptured diaphragm will cause a hazard. Where there is more than one regulator at a location, each regulator shall have a separate vent to

the outside, or if approved by the authority having jurisdiction, the vent lines err'aT shall be permitted to be manifolded in accordance with accepted engineering practices to minimize back pressure in the event of diaphragm failure. See 2.9.7 for properly locating the vent. Materials for vent Dining shall be in accordance with Section

. L v

Exception: A regulator and vent limiting means combination listed as complying with Standard for Gas Appliance Pressure Regulators, ANSI Z21.18, shall be permitted to he used without a vent to the outside, provided the regulator and vent limiting means are installed in a ventilated location.

[(a)2 through (b) Unchanged.]

[2.8.5 and 2.8.6 Unchanged.]

t t l o ~ t ~ u I L l ~ | ~ t l L ~ ~ | U | o m t l m ~ t ~ t ~ t ~ l a ~ ~ 1 ~ t / ~ l ~ l t x ~ ~ t

LktueCcd ,"~a,,Ica,,~ .7.,~c~, ,~,'~I/NI~, ,'~ 53.

2 .90verpressure Protection Devices.

2.9.1 General. Overpressure protection devices shall be provided to prevent the pressure in the piping system from exceeding that ~ralue that would cause unsafe operation of any connected and properly adjusted gas utilization equipment. (See 2.9.5.)

(a) The requirements of this section shall be met and a piping system deemed to have overpressure protection where the following are included in the piping system:

1. Two devices (a service or line pressure regulator plus one other device) are installed, and

de-dec), cacL l~;-,.;G,~g ~. Each device limits the pressure to a value that does not exceed the maximum working pressure of the downstream system, and

3. The failure of both ,,fwldch . ;~sc f,d! devices occurs simultaneously in order to overpressure the downstream system.

The pressure regulating, limiting, and relieving devices shall be p.roperly, maintained, . . . . and inspection D rrocedures shall he devised or statable mstxumentation mstaUed to detect failures or malfunctions of such devices, and replacements or repairs shall be promptly made.

[(b) Unchanged.]

2.9.2 Devices. Any of the following p, ~o~, . . . . l;cd~g o; f, i c ~ , c t~ni'tirrg-pressure-relievin~ or pressure-limitin~ devices shall be permitted to be used.

(a) Sprin~-loaded relief device.

[(b) through (f) Unchanged.]

The above devices may shall be installed as an integral part of the service or line pressure regulator or as separate units. If separate v' "-~;~' c rCI~C;~',~g ~, t~iC~a, .. I;,,,~G,,~S pressure-relievin~ or pressure-

devices are installed, they shall comply with 2.9.3 through 2.9.8.

I2.9,$ through 2.9.8 Unchanged,]

[2.10 Back Pressure Protection. Unchanged.]


Part 3 Gas Piping Installation

[3,1 Piping Underground. Unchanged.]


~ Protection Against Corrosion. Gas piping in contact with earth or other material that could corrode the piping shall be protected against corrosion in an approved manner. When

864

N F P A 54 - - A 9 6 R O P


dissimilar metals are jo ined underground, an insulating coupling or fitting shall be used. Piping shall not be laid in contact with cinders.

Uncoated threaded or socket welded joints shall not be used in piping in contact with soil or where internal or external crevice corrosion is known to occur.

NCTE: Fv, i.£~, ,, , . .Go....n c¢., .~ i . . . . p;o~cfi . . . . ,X u . d c , -

[3.1.4 Protection Against Freezing. Unchanged.]

+"_+d,7~'~. +..+?+v. ~Y"'~'~+~'~'+,,-7'++'+2'~Yv'+_~; +'+'7" "/+ :++"L +'+,: .v-, I ~ U l l £ ~ + m l u t I t L x t £ ~ + + + I ~ £ l V l U G + I # m t + ~ U l ~ I U ~ I I O I + I U L £ t l t U l J ~ + ,


3.1.7 Plastic Pipe.

(a) Connection of Plastic Pining. Plastic pipe shall be installed outside, u n d e r , r o u n d only.

Exception No. 1: Plastic pipe shall be oermit ted to terminate above , round where an anodeless riser'is used to terminate above~rou nd.

Exceotion No. 2: Plastic nine shall be nermit ted to tern~inate with a service head adaoter abo(~e~round in I~uildin~s. including basements, where the nlastic nitre is inserted in a oiDin~ mate~dal permit ted for use ]n buil~tita~s, " "

3.1.5 C . . . . . . ; ; , a GP PI , .~c P¥;~g. ~ Connections between metallic and plastic piping shall be made only outside, underground, and with Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings, ASTM D2513, Category 1 transition fittings,

3.1.8 P l , ~ c P;vc. ~ An electrically continuous corrosion- resistant tracer wire (min. AWG 14) or tape shall be buried with the plastic pipe to facilitate locating. One end shall be brought aboveground at a buihting wall or riser.

3.2 Aboveground Piplr~g Outside. Piping installed aboveground shall be securely suppor ted and located where it will be protected fromphysical damage (also see 3.1.4). Where passing through an outside wall, the piping shall also be protected against corrosion by coating o r wrapping wMa an inert material approved for such applications. Where piping is encased in a protective pipe sleeve, the annular space between the gas piping and the sleeve shall be sealed at the wall to prevent the entry of water, insects, or rodents.

[3.3 Piping in Buildings. Unchanged.]

[3,3.1 through 3.3.3 Unchanged.]

3.3.4 Above-Ceiling Locations. Gas piping shall be permit ted to be installed in accessible above-ceiling spaces, whether or not such spaces are used as a plenum. Valves shall not be located in such spaces.

Excention: Equinment shutoffvalves required bv the Code shall be pernaitted to be ii~stalled in accessible above-ceili'ng spaces contaiB- ing vented gas utilization euuinment.


[Table II Unchanged.]

3.4 Concealed Piping in Buildings.

[3.4.1 General. Unchanged.]

3.4.2 Connections in Original Installations. When ~ gas piping that is to be concealed is being installed, unions, tubing fittings, running threads, right and left couplings, bushings, swing joints, and compression couplings made by combinations of fittings shall not be used.

Exception No. 2: Fittings listed for use in concealed spaces that have been demonstrated to sustain, without leakage, any forces due to temperature expansion or contraction, vibration, or fatigue based on their geographic location, application, or operation shall be permitted to be used.


[3.5 Piping in Vertical Chases. Unchanged.]

[3.6 Gas Pipe Turns. Unchanged.]


3.6.3* Mitered Bends. Mitered bends re'e-shall be permit ted subject to the following limitations:

[(a) and (b) Unchanged.]

[3.6.4 Elbows. Unchanged.]


[3.13 Systems Containing Flammable Gas-Air Mixtures. Un- changed.]

[$.13.1 through 3.15.5 Unchanged.]

3.13.6 Use of Automatic Firechecks, Safety Blowouts, or Backfire Preventers. Automatic firechecks and safety blowouts or backfire preventers shall be provided in piping systems distributing flammable air-gas mixtures from gas-mixing machines to protect the p ip ingand the machines in the event of flashback, in accordance with the following recommendations:

(a) Approved automatic firechecks shall be installed upstream as close as practicable to the burner inlets following the firecheck manufacturers ' instructions.

NOTE 1: Two basic methods are generally used. One calls for a separate firecheck at each burner, the other a firecheck at each group of burners. The second method is generally more practical if a system consists of many closely spaced burners.

NOTE 2: An approved automatic firecheck shall be installed as near as v' , , . d~b l~ ~ upstream from a flame arrester used for local protection where test burners or lighting torches are employed.

(b) A separate manually operated gas valve shall be provided at each automatic firecheck for shutting off the flow of gas-air mixture through the firecheck after a flashback has occurred. The valve shall be located upstream as close as practical to the inlet of the automatic firecheck.

CAUTION: These valves rtmat sball not be reopened after a flashback has occurred until the firecheck has cooled sufficiently to prevent reignition of the flammable mixture and has been

reset orooerlv.

[(c) Unchanged.]

The discharge from the safety blowout or backfire preventer shall be located or shielded so that particles from the ruptured disc cannot be directed toward personnel. ~ ~ there are in terconnected installations of gas-mixing machines with safety blowouts or backfire preventers, provision shall be made to keep the mixture from other machines from reaching any ruptured disc opening. Check valves shall not be used for this purpose.

[ (d) Unchanged.]

3.14 Electrical Bonding and Grounding.

[ (a) Unchanged.]

(b) Gas piping shall not be used as a grounding conductor or electrode.

[3.15 and 3.16 Unchanged.]

Exception No. 1: Jo in ing tubing by brazing [see 2.6.8(b)] shall be permitted.

865

N F P A 54 ~ A 9 6 R O P


Part 4 Inspection, Testing, and Purging

4.1 Pressure Test ing and Inspection.

4.1.1 General.

[(a) and (b) Unchanged . ]

(c) In the event repairs or addit ions are made following the pressure test, the affected piping shall be tested• , c~,~ct,t J~at, h. "d,~

Exceotion: Minor repairs or additions, ~caC..g ah,d'l b,; vc,,~fi~cd t .

. . . . . h o~d . . . . nrovided the work is insnected and connect ions are tested with a noncorrosive leak-detectih~ fluid or o ther leak- detect ing me thods approved by the autllority havin~jurisdict ion.

(d) Because it is somet imes necessary to divide a piping system into test sections and install test heads, connec t ing piping, and o ther necessary appur tenances for testing, it is no t required that the tie-in sections of pipe be pressure tested. Tie-in connect ions, however, shall be tested with a~ap o~ l . Jon a noncorrosive leak detect ion fluid after gas has been in t roduced and the pressure has been increased sufficiently to give some indications ~ if leaks exist. [See , ~ : ~ +;, ;,llo~,;c,g 4.1.5 (b).] A.4.1.5(b).]

[(e) and (f) Unchanged . ]

(g) Regulator and valve assemblies fabricated independent ly of the piping system in which dley are to be installed shall be permi t ted to be tested with inert gas or air a t f l le t ime of fabrication.

4.1.2 Tes t Medium. The test m e d i u m shall be air, ni t rogen, or carbon dioxide. OXYGEN SHALL NEVER BE USED.

Exception: Fuel gas shall be permi t ted to be used in piping systems operat ing at pressures of 0.5 psig (3.4 kPa gauge) or less. .

4.1.3 Test Preparation.

(a) Pipe joints , inc luding welds, shall be left exposed for examina- tion dur ing die test.

Exceotion: If the pipe end joints have been previously tested in accordance with this Code, they silall be permi t ted to be covered or concealed.

[ (b) Unchanged . ]

(c) Equ~t,,,c;,~ Aooliances and e~u i omen t that i~ are not to be included in die tes{ shall be ei ther d i sconnec ted f rom the piping or isolated by blanks, bl ind flanges, or caps. Flanged joints at which blinds are inserted to blank off o ther e q u i p m e n t dur ing the test shall no t be required to be tested.

(d) Where the piping system is connec ted to appliances, e q u i ~ enm_e.gL_~ equ ipme n t e ,r-components des igned for operat ing pressures of less than the test pressure, such ~ , w ; v , , , ¢ i - t appliances, equipment , or e q u i p m e n t componen t s shall be isolated f rom the piping system by-disconnecting d iem and capping the outlet(s).

(e) Where the piping system is connec ted to appliances, euuio- men t or equ ipme n t wr-components des igned for opera t ing " " pressures equal to or greater t h a n the test pressure, such and equ ipmen t shall be isolated from the piping system by closing the individual e q u i p m e n t shutoffvalve(s) .

[ (f) Unchanged . ]

4.1.4 Test Pressure.

[ (a) and (b) Unchanged . ]

l l l ~ . l . 1 , • e n ~ ¢ o - , / a ~ , ~ ] i l n ,

1 ~ t e , I e e . t • " . . * ~ . . i ' , , , , r . 1 ~ ' y v W_v . . . . . . . ~_?'_~ sF~ . . . . - v_; . . . . . . . y . . . . ~ ~o<, ,o,,%,,'-1 . . . . . v k u " , " ~ 7 " ' s ~ ~ : :~ -~ ;3 ~ ' , .2~ . , . X . ~ ; , ~ . o y , : . . . . "7".". . . . . . y ~ . . ,

?;:~;;:]'.:2b. [7"_::22::;252 :.'F'.,::~2:;Z~Y; ETE~I,F ;Y;Z.jE . . . . . t . . . . . . 1.3(c).] t=,, Test dura t ion shall be no t less than 1 /2

h.~r for each 500 ~ c u f t (14 m3) of pipe volume or fraction thereof. When testing a system having a volume less than 10

c u f t (0.28 m3) or a system in a single-family dwelling, the test durat ion shall be permi t ted to be reduced to 10 mJ~ttem, min. For piping systems having a volume of more than 24,000 c u f t (680 m3), the dura t ion of the test shall no t be required to exceed 24 ~ hr~

4.1.5 Detection of Leaks and Defects.

[ (a) Unchanged . ]

(b) The leakage shall be located by means of an approved combust ible gas detector, a,,,, v ~ . d ~;a~c*, ~, , , , c,tu:v,d'c,it ~6L,~ . . . . . . bI~ ov',uJ . . . . a noncorrosive leak detect ion fluid, or o ther ,approved leak detect ion methods . Matches, candies, open flames, or o ther me thods that could provide a source of ignition shall not be use&

• ; . . . . . . . : - i . . . . . . . . . . . . . . . . . . . . . . . : . . . . . ~ . . . . . E . v . . s . o . . . . . .

Where leakage or o ther defects are located, the affected port ion of the piping system shall be repaired or replaced mid retested. [See 4.1.1 (c).]

[4.1.6 Test Records. Unchanged . ]

[4.2 System and Equipment Leakage Test. Unchanged . ]

[4.2.1 Before Turn ing Gas On. Unchanged . ]

4.2.2* Test for Leakage. Innnediately after t u , ,A .g . , J~c g ~ , th___¢ gas is tu rned on, the piping system shall be tested to ascertain that no gas is escaping. If leakage is indicated, the gas supply shall be shu t off until the necessary repairs have been made.

[4.2.3 Placing Equipment in Operat ion. Unchanged . ]

4.3* Purging.

[4.3.1 Removal f rom Service. Unchanged . ]

]Table III Unchanged . [

4.3.2 Placing in Operat ion. W h e n piping full of air is placed in operation, the air in the piping shall be displaced with fuel gas, provided the piping does no t exceed tile length shown in Table IV. The ,air can be safely displaced with fuel gas provided that a moderately rapid and cont inuous flow of fuel gas is in t roduced at one end of tile line and air is vented out at the o ther end. The fuel gas flow ~rotfl@ shall be cont inued without in terrupt ion until die vented gas is free of air. The poin t of discharge shall n o t be left una t t ended du r ing purging. The vent shall t hen be closed.

If the piping ~a 3 k~ l . . . . . la.gci, exceeds the lengths shown in Table W. die air in the piping shall be displaced with an inert gas, and the inert gas shall t hen be displaced with fuel gas.

[Table IV Unchanged . ]

[4.3.3 and 4 . 3 . 4 Unchanged . ]

Part 5 Equipment Installation

5.1" General.

[5.1.1 th rough 5.1.5 Unchanged . [

5.1.6 Protection of Gas Equipment from Fumes or Gases Other than Products of Combustion. Wl'rerrWhere corrosive or f lammable process fumes or_r..gafi~ are present , m e a n s for their safe disposal shall be provided. Such fumes 9.Lga&ca include carbon monoxide , hydrogen sulfide, ammonia , chlorine, and ha logena ted hydrocarbons.

NOTE: Halogenated hydrocarbons are particularly injurious and corrosive after contact with f lames or ho t surfaces.

Gas appliances installed in beauty shops, barber shops, or o ther facilities where chemicals tha t genera te corrosive or f lammable products such as aerosol sprays are routinely used, shall be located in

866

NFPA 54 - - A96 ROP


an equ ipmen t room separate or par t i t ioned off f rom other areas with provisions for combust ion and dilut ion air f rom outdoors.

Exception: This r equ i r emen t shall no t apply to direct vent e q u i p m e n t tha t is constructed and installed so all air for combust ion is obtained f rom the outside a tmosphere and all flue gases are discharged to the outside a tmosphere .

[5.1.7 t h rough 5.1.14 Unchanged . ]

5.1.15 Adequate Capacity o f Piping. W h e n c......ccG;~s additional tlgaS utilization e q u i p m e n t is being connec ted to a gas piping system,

ae existing piping shall be checked to de te rmine if it has adequate capacity. (See Section 2.4.) If inadequate, the existing system shall be enlarged as necessa~/, or separate gas p ip ing of adequate capacity shall be run f rom the point of delivery to the equipment .

[5.1.16 and 5.1.17 Um:hanged. ]

5.1.18 Venting of Gas Appliance Pressure Regulators.


(c) In the case of vents leading outdoors, means shall be employed to prevent water f rom enter ing this p iping and also to prevent ~t%,t,agc +f ;t blockage of vents by insects and foreign matter.

[(d) t h rough (f) Unchanged . ]

5.1.19 Bleed Lines for Diaphragm-Type Valves.

[(a) Unchanged . ]

(b) In the case of bleed lines leading outdoors, means shall be employed to prevent water f rom enter ing dais piping and also to prevent ozot, r,agc of ;t blockage of vents by insects and foreign matter.

[(c) t h rough (e) Unchanged . ]

[5.1.20 and 5.1.21 Unchanged . ]

5.1.22 Protection of Ou tdoor Equipment . Gas utilization equip- men t not listed for outdoor installation but installed outdoors shall be provided with protect ion to the degree that the env i ronment requires. Equ ipmen t listed for outdoor installation rrrny shall be permi t ted to be installed without protection in accordance with the provisions of their listing. (See 5.2.1.)

[5.2 Accessibility and Clearance. Unchanged . ]

5.3* Air for Combus t ion and Ventilation.

[5.3.1 General. Unchanged . ]

5.3.2* Equipment Located in Unconf ined Spaces.

t . ~ T , , ~ • . . . "

adcquat~ ;.o t" ~.~dc ,,;. ,%. c~,-,~bu~doa, vcadlado, , , and ,fdluGva of

~er)- Equ ipment located in buildings of unusual ly t ight construct ion (see Section 1.7, Definitions) shall be provided with air for combustion, ventilation, and dilution of flue gases us ing the me thods described in 5.3.3(b) or 5.3.4.

5.3.3 Equipment Located in Confined Spaces.

(a) All Air f rom Inside the Building. The conf ined space shall be provided with two p e r m a n e n t openings communica t ing directly with an additional room(s) of sufficient volume so that the combined vo lume of all spaces meets the criteria for an uncon f i ned space. The total inpu t of all gas utilization e q u i p m e n t installed in the combined space shall be considered in making this determinat ion. Each open ing shall have a m i n i m u m free area of 1 ~ , , . l u , , . , - . h ,d , ~ per 1,000 Btu per ~ h._Lr (22 cm2 per kw) of the total inpu t rating of all gas utilization e q u i p m e n t in the conf ined space, bu t no t less than 100 o~1~ c h.cLc~ ~_.q_i_~, (645 cm2). O n e open ing shall c o m m e n c e within 12 h'retm~ in. (30 cm) of the top, and one open ing shall c o m m e n c e within 12 ~ i i ~ . (30 cm) of the bottom, of the enclosure (see Figure 1 ). T he m i n i m u m d imens ion of air open ings shall be no t less than 3 irrc'+r~ in. (8 cm).

[Figure 1 Unchanged . ]

(b). A l l A i r , F ~ . f rom O u t d o o r s . . T h e conf ined space shal!.,h~.'. ,

(gC c,,,) of Zl,c [,,,zto,~, ,,f d.c ci, Gvs~l'~. communica te with the outdoors in accordance with me thods 1 or 2. The m i n i m u m dimens ion of air ooenings shall no t be less than 3 in. (8 cm). 4= Where ducts are used, tffey shall be of the same cross-sectional area as the free area of the openings to which they connect .

1. Two oermalqent onenin~s, one c o m m e n c i n g within 12 in. (30 cm~ of th'e ton. and orie corffmencing within 12qn. (30 cm~ o f the bottom, of the enclosure shall be nro~vided. The openings shall communica te directly, or by d u c ~ with the outdoors or spaces (crawl or attic) that freely communica te with the outdoors. The conf ined soace shall communica te with the outdoors in accordance with me thods 1 or 9. The m i n i m u m d imens ion of air openings shall ~ - r ~ e not be less than 3 i r r e ~ in. (8 cm). Where ducts are used. they shall be of the same cross-sectional area as the free area of the onenin~s to which thev connect.

~. a. Where directly communica t ing with the "•

i.. if,.. c.c:. .~u, c. (Scc Gts~; c~ 2 ~ d 3.) 2. ; ;q,c, c outdoors or where communica t ing w i ~ to the outdoors t h rough vertical ducts, each open ing shall have a m i n i m u m free area of 1 ~quo~ c i . c ' , ~ per 4,000 Btu per t-~e~-hr (5.5 cm2 per kw) of total inpu t rating of all e q u i p m e n t in the enclosure. (See Figure 3.)

~. b~ Where communica t ing with the outdoors t h rough horizontal ducts, each open ing shall have a m i n i m u m free area of 1 i r , ~ s_s_s_s_s_s_s_s_s_~, per Z000 Btu per t ' r ~ r - ~ (11 cm2 per kw) of total input rating of all equ ipmen t in the enclosure. (See Figure 4.)

2. One n e r m a n e n t onenin~, commenc in~ within 12 in. (30 cm) of the ton of the enclosure, shall be oermi t ted where the e o u i n m e n t has clearances of at least 1 in. (2.$ cm~ f rom the side and back an d 6 in. (16 cm~ f rom the f ront of the annliance. The onen ing shall direcdv communica te with the out~loors or shall commur~icate th rough a ver0c~l or horizontal duc t to the outdoors or spaces (crawl or attic) that freely communica te with the outdoors, and shall have a m i n i m u m free area of:

z. 1 so in. her 3.000 Btu her hr (7 cm2 oer kw~ of the total innu t rating of'all equ ipmen t Ioc,~ted in the enclosure . and

b. Not less than the sum of the areas of all vent connectors in the conf ined space.


I5.5.4 Specially Engineered lnstanations. Unchanged . ]



5.3.5 Louvers and Grilles. In calculating free area in 5.3.3, considerat ion shall be given to the blocking effect of louvers, grilles, or screens protect ing openings. Screens used shall no t be smaller than -1-Tz4-im~ 1/4-in. (6.3-ram) mesh• f f t he free area th rough a design of louver or grille is known, it shall be used in calculating the size open ing required to provide the free area specified. If the design and free area are no t known, it shall be a s sumed tha t wood louvers will have 20-25 percen t free area and metal louvers an d grilles will have 60-75 percent free area. Louvers and grilles shall be f ixed in the open pos i t ion~"

~ i n t e r l o c k e d with the e q u i p m e n t so that they are v t . c . c d aa t..,,,.;J.~d'ly 9.p.KO. dur ing eepriT, m m ~ main bu rne r operation. Provision shall be provided to prevent the main burner f rom i~niting should the louver fail to t h e n .

v v

5.4 Equipment on Roofs.

[5.4.1 General. Unchanged . ]

867

N F P A 54 ~ A 9 6 R O P


5.4.2 Installation of Equipment on Roofs.

[(a) Unchanged.]

(b) Equipment shall be installed on a well-drained surface of the roof, At least 6 ft (1.8 m) clearance shall be available between any part of the equipment and the edge of a roof or similar hazard, or rigidly fixed rails or guards at least 42 in. (1.1 m) in height shall be provided on the exposed side., . . . . vt d,~t t ,~,t ,~t~

Excention: Parapets or other building structures at least 42 in. (1.1 m) ifi height r r r ~ h a l l be permit ted to be utilized in lieu of rails or guards.

(c) All equipment requiring an external source of electrical power for its operation shall be provided with (1) a readily accessible electrical disconnecting means within sight of the ,.qaiv,~cuZ, ;;k~cl,' equipment that will completely deenergize the equipment, and (2) a 120-volt AC ~ grounding-type receptacle outlet on the roof adjacent to the equipment. The receptacle oudet shall be on the supply side of the disconnect switch.

[ (d) Unchanged.]

5.4.3 Access to Equipment on Roofs.

[(a) Unchanged.]

(b) Buildings of more than 15 ft (4.6 m) in height shall have an inside means of access to the roof. unless other means accentable to the authority having jurisdiction are used.

[ (c) Unchanged.]

At least 6 ft (1.8 m) of clearance shall be available between the access opening and the edge of. the roof or. similar, hazard, or rigidly fixed rails or guards at least 42 m. (1.1 m) m he,ght shall be provided on the exposed side; parapets or o therbu i ld ing ~-netm-e

at least 42 in. (1.1 m) in height rrvayshall be nermit ted to be utilized in lieu of guards or rails.

[ (d) Unchanged.]

[5.4.4 Additional Provisions. Unchanged.]

5.5 Equipment Connections to Building Piping.


5.5.7 Sediment Trap. I fa sediment trap is not incorporated as a part of the gas utilization equipment, a sediment trap shall be installed a.s close to the inlet of the equipment as practical at the time of e q ui p men t installation ..The sediment trap shall, be either a. tee fitting with a capped nipple m tiae bot tom outlet as dlustrated m Figure 5 or other device recognized as an effective sediment trap. Illuminating appliances, ranges, clothes dryers, and outdoor grills r reed"n~ shall not be required to be so equipped.

[Figure 5 Unchanged.]

[5.5.8 Installation of Piplng. Unchanged.]

5.6 ElectHcal.


[5.7 Room Temperature Thermostats. Unchanged.]

Part 6 Installation of Specific Equipment

6.1 General.

(a) This ~ part is applicable ~ to nonindustrial-type gas utilization equipment and installations and, unless specifically indicated, does not apply to industrial-type equipment and installations. Listed gas utilization equipment shall be installed in accordance with their listing and the manufacturers ' instructions, or as elsewhere specified in this part. Unlisted equipment shall be installed as specified in this part as applicable to the equipment.

For additional information concerning particular gas equipment and accessories, including industrial types, reference can be made to the standards listed in Part 12 and Appendix L.

[ (b) Unchanged.]

6.2 Air Conditioning Equipment (Gas-Fired Air Conditioners and Heat PumosL


6.2.3 Clearances for Indoor Installation.

[ (a) Unchanged.]

Exception No. 1: Air-conditioning equipment listed for installation at lesser clearances than those specified in Table V may shall be permitted to be installed in accordance with ~;~ 12ad,,g ~ud the inanufacturer 's instructions.

Exception No. 2: Air-conditioning equipment listed for installation at greater clearances than those specified in Table V shall be installed in accordance with ~, l:aG.,g =~d the manufacturer 's instructions unless protected as specified in Exception No. 3.

Exception No. 3: Air-conditioning equipment installed in rooms large in comparison with the size of the equipment may shall be permit ted to be installed with reduced clearances to combustible haaterial, provided the combustible material or the equipment is protected as described in Table VI.

(b) Air-conditioning_equipment installed in spaces such as alcoves and closets shall be specifically listed for such installation and installed in accordance with the t . . . . . v~ 2to ll~G,a s. manufacturer 's instructions. The installation clearances for air-conditioning equipment in rooms not large in comparison with the size of equipment shall be as specified in the listing, regardless of whether the enclosure is of combustible or noncombust ible material, and shall not be reduced by the protection methods described in Table VI.

[(c) and (d) Unchanged.]


6.3 Central Heating Boilers and Furnaces.

[6.3.1 Clearance. Unchanged.]


[Table V Unchanged]

Notes Applicable to Table V

[1 and 2 Unchanged.]

3. This clearance may is permitted to be reduced to 1 in. (2.5 cm) for a listed forced air or gravity furnace equipped with:



6. For unlisted gas utilization equipment equipped with an approved draft hood, this clearance may is permit ted to be reduced to 9 ~ in~ (23 cm).

[7 through 10 Unchanged.]

[(c) and (d) Unchanged.]

[Table VI Unchanged]

Notes Applicable to Table VI


4. Where all clearance reduction systems t l ~ r g use a ventilated air aCe, adequate provision for air circulation shall be provided as scribed. (See Figures 7 and 8.)

5. There shall be at least 1 imd'r in~ (2.5 cm) between clearance reduction ~ m - s ~ and combustible walls and ceilings for reduction systems using a ventilated air space.

6. I fa wall protector is mounted on a single flat wall away from corners, adequate air circulation may shall he permit ted to be provided by leaving only the bottom and top edges or only the side

868

N F P A 54 - - A 9 6 R O P


and top edges open with at least I k , d , (7..5 . . . . ) a I-in. (2.5-cm) air gap.

[7 t h rough 10 Unchanged . ]

11. Listed sin~le-wall connectors shall be oermi t ted to be installed in accordance ~¢ith the terms of their listin6 and the manufac tu re r ' s instructions.

6.3.2 Erection and Mounting. A central hea t ing boiler or furnace shall be erected in accordance with the manufac tu re r ' s instructions and shall be installed on a floor of noncombust ib le construct ion with noncombus t ib le f looring a n d surface finish and with no combust ible material against the unders ide thereof , or on fire- resistive slabs or arches having no combustible material against the unders ide t h e r e o ~

Excevt ion No. 1: Aooliances listed for installation on a combust ible f loor '~, d-,~ ~ w , :o" "

Exception No. 2: Installation on a floor protected in an approved manne r .

[Figures 6 dwough 8 Unchanged . ]

[6.3.3 and 6.3.4 Unch:mged. ]

6.3.5* Steam Safety and Pressure Relief Valves. Steam and ho t water boilers shall be ecluipped, respectively, with listed or approved s team safety or pressure relief valves of appropriate discharge capacity and conforming with ASME requirements . A shutoffvalve shall no t be placed between the relief valve and the boiler, or on discharge pipes between such valves and the a lmosphere .

(a) Relief valves shall be oioed to discharge near the floor.

(b) The entire d is fhar~ed Dioin~r shall be at least the same size as the relief valve d iseharge~pi#@.

(c) Discharge p ip ing shall riot contain th readed end connect ion at it, s terminat ion point.

6.3.6 Plenums and Air Ducts.


(c) ~ Where a p l e n u m is no t suppl ied with the furnace, any fabrication and installation instructions provided by the manufacturer shall be followed. The m e t h o d of connec t ing supply and re turn ducts shall facilitate proper circulation of air.

NOTE: Reference rrmy can be made to Standard for the Installation of Air C o n d i t i o n i n g a n d Ventilating Systems, ANSI/ NFPA 90A, or to S tandard for the Installation of Warm Air Heat ing and Air Condi t ioning Systems, ANSI/NFPA 90B.

(d) ~t~err Where a furnace is installed so supply ducts carry air circulated by the furnace to areas outside the space conta in ing the furnace, the re turn air shall also be hand led by a duct(s) sealed to the furnace casing and te rminat ing outside the space containing the furnace.

[6.3.7 and 6.$.8 Unchanged . ]

6.4 Clothes Dryers.

6.4.1 Clearance.

(a) Listed Type 1 clodaes dryers shall be installed with a m i n i m u m clearance of 6 in. (15 cm) f rom adjacent combustible material, except that clothes dryers listed for installation at lesser clearances rrrny shall be permi t ted to be installed in accordance with their listing. Type 1 clothes dryers installed in closets shall be specifically listed for such installation.

(a) Make-up air shall be provided for closet-installed Type 1 clothes dryers in accordance with the manufac tu re r s ' installation instructions.

NOTE: ; ;~, , , . ,c a T)vc i ~l~d,~o diT,.i ~ c , ,L ,u~, .d ;.,, d,c

[(b) Unchanged . ]


[6A and 6.6 Unchanged . ]

[Table VII Unchanged . ]

6.7 Decorative Appliances, Vented.

6.7.1 Prohibi ted Installations. ~h 'di ,~-~Vented decorative appliances shall no t be installed in ba th rooms or bedrooms the appliance is listed, and the bedroom or ba th room is an unconf ined soace. (See 5.3.2 and Section 1.7. Definitions.)

NOTE: For informat ion on vented decorative appliances, see Vented Decorative Gas Appliances, ANSI Z21.50.

6.7.2 Installation.


(c) Panels, grilles, and access doors that rrm~ are renui red tO be removed for t]ormal servicing operat ions shall no t be ~tttached to the building.

[6.7.3 Combustion and Circulating Air. Unchanged . ]

6.8 Direct Make-Up Air Heaters.

[6.8.1 and 6.8.2 Unchanged . ]

6.8.3 Outs ide Air. All air hand led by a direct make-up air heater, i nc lud ingcombus t ion air, shall be b rough t in f rom outdoors. Indoor air rrmy shall be permi t ted to be added to the outdoor airs tream after the outdoor airs tream has passed the combust ion zone.

6.8.4 Outs ide Louvers. If outside louvers of ei ther the manua l or automat ic type are used, they shall be proved in the open posit ion before the main burners ~tl'r-operate.

6.8.5 Controls.

[ (a) Unchanged . ]

(b) Unlisted direct make-up air heaters shall be equipped with:

I. Airflow sens ing devices so des igned and installed as to shu t off the gas to the main burners upon failure of either combus t ion air or main air supply ~ m ' r t r ~ ~ actuated by failure of the power supply to the blower motor do ,-~c,:. mcc t Zl,c ;,,:c,A. of ~.;,;~ t , i , ,d0;, , ,) ; shaft no t be permi t ted to mee t this requirement ;

[2 and 3 Unchanged . ]


6.9 Direct Gas-Fired Industrial Air Heaters.

6.9.1 Application.

- a " . l ~ . . ~ ~ 1 T J • ~ I A * _ T Y , A ~ r o l

/ L ~ I T I t • 1 1 • . _ _ _ ~ J * ] , • 1 ~ 1 . . . . . L I I • 1

[(b) and (c) Unchanged . ]

[6.4.2 Exhaust ing to the Outs ide Air. Unchanged . ]

6.4.3 Provisions for Make-Up Air.

L ? ~ t , ~ ~ . . . . . . . ~ '° ,~. ,~ '~u'e." '~L:~ ° ? ~ ' , ~ V~', ' ' ? .~?. . . . . h ' " ~ . . ~ ' ~ • ? , ~ , ~ ~ v v , y . . . . z ~ , ~ , ~ - ~ , ~ , , . y 7 - ? , , ~ j - , , ~ , T U ~ ,, ~.- . . . . ; ~ - .

t , -sd.g ..gc;,cy, bo.,cd ,~., zl,,. ~,i~':c~blc ;cqu;, .:a~C.~ ,,E Direct fired industrial air heaters shall be listed in accordance with Standard for Direct Gas-Fired Industrial Air Heaters, ANSI Z83.18.

869

N F P A 5 4 - - A 9 6 R O P


6.9.2 Prohibited Installations.

Direct gas-fired industrial air heaters shall no t use recireulation of room air in buildings that contain flammable solids, liquids, or gases, explosive materials, or substances that may can become toxic when exposed to flame or beat.

[ L l U U O L I E t ] ~ [ b ~ l E I J I l ~ l b e l l ~ l ~ l ~ O t

( b ) Direct ga+-firedindustrial air heaters shall t,c pcc;,-,:zccd :~

(~) Dh c~i s ~ K , ,.d ;.d~,ai, i,,l' ah l ,c, icia shall not be installed in any area containing sleeping quarters.

6.9.3 Installation.

(a~ Listed direct ~as-fired industrial air heaters shall be permit ted tO be installed in accordance with their listin~ and the manufacturer 's instructions.

(b) Unlisted direct gas-fired industrial air heaters shall not be installed.

Exception: Unlisted equipment shall be permit ted to be installed where the installation is approved by the authority having jurisdiction and a site-specific equipment evaluation is performed by an independent tesf in~ agency based on the applicable requirements of Standard for (a) Lioi.d d;, ~ i ~ , , cd i.=d.az, ~.I . ; ; ' .c .z~, . a ' , . l l bc l;atcd k, ,,coG, ',L,,,c¢ wlil, Direct Gas-Fired Industrial Air Heaters, ANSI Z83.18.

(c) Direct gas-fired industrial air heaters shall (a) Dii col tsoo-,qi ~d ; ,d ,o l , i,A hh' h~aic , , ,L,,ll be installed only in industrial or commercial occupancies.

(d) Direct eras-fired industrial air heaters shall be permit ted to provide fresl{'air ventilation.

16.9.4 Clearance from Combustible Materials. Unchanged.]

[6.9.5 Air Supply. Unchanged.]

[ (a) Unchanged.[

(b) If outside air dampers or closing louvers are used, they shall be verified to be in tile open position prior to main burner operation.

NOTE: Recirculation of room air m'a~ca..__nn be hazardous in the presence of flarmnable solids, liquids, and gases, explosive materials (e.g., grain dust, coal dust, gun powder), and substances il,ai may bcc,,m~ tu,Gc ;;:~c,. cxv, ozcd ;.o , q o ~ (e.g., refrigerants, aerosols, etc.) that can become toxic when exnosed to flame or heat.


6.10 Duct Furnaces.

6.10.1 Clearances.

(a) Listed duct furnaces shall be installed with clearances of at least 6 ~ in. (15 cm) between adjacent walls, ceilings, and floors of combustible material and the furnace draft hood, except that furnaces listed for installation at lesser clearances may shall be permit ted to be installed in accordance with their listings. In no case shall the clearance be such as to interfere with combustion air and accessibility. (See 5.2.1 and Section 5.3.)

[ (b) IJnchanged.]


6.10.5 Circulating Air. Where a duct furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

~-The duct furnace iz c, , , .-cazcd z , , , . ,.iu, ,~ .~, .1.,~z v, ~Jy ,,d.c. it~l..i .,;, ,..~z,:..G..u, d,~ f , . . . . . . shall be installed on tile positive- pressure_side of the circulating air blower.

6.10.6 Duct Furnaces Used with Refrigeration Systems.

(a) A duct furnace shall not be installed in conjunction with a refrigeration coil when where circulation of cooled air is provided by the b l o w e ~

Excention: Where the blower has sufficient capacity to overcome the external static resistance imposed by the duct system, furnace, and the cooling coil at the air th roughput necessary for heating or cooling, whichever is greater.

(b) Duct furnaces used in conjunction with cooling equipment shall be installed in parallel with or on the upstream side of cooling coils to avoid condensat ion within heating elements, ,,A~oo d,~ du61 e i i ~ i ! i o , i r 1 , - . i ! . ~

With a parallel flow arrangement, the dampers or other means used to control the flow of air shall be sufficiendy tight to prevent any circulation of cooled air through the unit.

Excention: Where the duct furnace has been specifically listed for dowr;stream installation.

[(c) and (d) Unchanged.[

[ 6.10.7 Installation in Commercial Garages and Aircraft Hangars. Unchanged.]

[6.11 Floor Furnaces. Unchanged.]

6.12 Food Service Equipment, Floor Mounted.


6.12.7 ".~" -:I L~.~I. Level Installation. Floor-mounted food service equipment shall be installed level on a firm foundation.

6.12.8" Ventilation. Means shill be provided to properly ventilate the space in which food service equipment is installed to permit p roper combustion of the gas. V,",.c, .. c~,,,,.o'~.£~,a ~-c. u ~ d

[6.13 and 6.14 Unchanged.]

6.15 Household Cooking Appliances.

6.15.1 Floor-Mounted Units.

[(a) through (b) Unchanged.[

(c) l,,~;~dl Lcv,A. ~ Cooking appliances shall be installed so that the cooking top or oven racks are level.

6.15.2 Built-In Units.

[(a) through (c) Unchanged.]

(d) I,sz,,ll Lcwl. Level Installation. Built-in household cooking appliances shall be installed so that the cooking top, broiler pan, or oven racks are level.

6.16 lllumlnating Appliances.

[6.16.1 Clearances for Listed Appliances. Unchanged.]

6.16.2 Clearances for Unlisted Appliances.

[(a) Unchanged.]

(b) Open-Flame Type.

1. Unlisted open-flame illuminating appliances installed outdoors shall have clearances from combustible material not less than that specified in Table VIII. The distance from ground level to the base of the burner shall be at least 7 ft (2 m) where installed within 2 ft (0.6 m) of walkways. Lesser clearances shall be permit ted to be used wh,rer where acceptable to the authority having jurisdiction.

870

N F P A 54 - - A 9 6 R O P


2. Unlisted open-flame illuminating appliances installed outdoors shall be equipped with a limiting orifice or other limiting whiei'r devices that will maintain a flame height consistent with the clearance from combustible material, as given in Table VIII.

3. Appliances designed for flame heights in excess of 30 in. (76 cm) may shall be nermit ted to be installed if acceptable to the authority havingjhrisdiction. Such appliances shall be equipped with a safety shutoff device or automatic ignition.

[4. Unchanged.]

[Table VIII Unchanged.]



6.24 Room Heaters.

6.24.1" Prohibited Installations. Unren ted room heaters shall not be installed in bathrooms or bedrooms,

6.27 Gas-Fired Toilets.


6.27.3 Installation. Vents or vent connectors that are C, cy cc, a :d bc cat)able of bein~ contacted during casual use of the room in which ~ e toilet is in(tailed shall be protected or shielded to prevent such contact

6.28 Unit Heaters.

6.28.1 Support. Sa~vc .dcd ~t,c Susoended-type unit heaters shall be safely and adequately suppor ted with due consideration given to their weight and vibration characteristics. Hangers and brackets shall be of noncombust ible material.



6.29 Wall Furnaces.

6.29.1 Installation.

E~ceotion No. 1: Where at~nroved by the authority havin~ iurisdic- t ion, 'one listed wall-mount'e~t unren ted room heater euuiot)ed with

A . L

an oxygen deplet ion safety, shutoffsystem shall be oermit ted to be installed in a bathroom nrovided that the innut ratin~ shall not exceed 6000 Btu oer hour (1760 W / h r / a n d c o m b u s t ~ o n and ventilation air is 6rovided as st)ecified in 6.1 (b).

Exceotion No. 2: Where at)oroved bv the anthoritv havin~ iurisdic- t i on .one listed wall-mount'ecl unvented room heater eouiooed with an oxv~en det~letion safety shutoff system shall be oertl~itt'ed to be install'e"d in a bedroom orovided that the inout rat[n~ shall not exceed 10.000 Btu oer l'lour (2930 W / h r ) and combustion and ventilation air is nr~)vided as soecified in 6.1 (b).

[6.24.2 Installations in Institutions. Unchanged.]


[(a) Unchanged.]

(b) Radiating Type. Room heaters other than those of circulating type described above shall have clearance at

sides and rear of not less than 18 in. (46 cm); except that heaters that make use of metal, asbestos, or ceramic material to direct radiation to the f ront of the heater shall have a clearance of 36 in. (91 cm) in f ront and, if constructed with a double back of metal or ceramic, shall be permit ted to be installed with a clearance of 18 in. (46 cm) at sides and 12 in.(30 cm) at rear. Combustible floors under unlisted room heaters shall be protected in an approved manner .

[6.24.4 Wall-Type Room Heaters. Unchanged.]

6.25 Sauna Heaters.

[6.25.1 Location and Protection. Unchanged.]

[6.25.2 Installation o f Heater. Unchanged.]

[(a) through (d) Unchanged.]

(e) Panels, grilles, and access doors that ~ are reauired to be removed for normal senAcing operations shall not be attached to the building.

[(f) Unchanged.]

6.25.3 Connection. The provisions of Section 5.5 shall be followed. ~xccl~: d,~:, wl., . , c

Excention: Where access to controls is from an adjacent room, conn~ections shall be m~ade in that room.

(a) Listed wall furnaces shall be installed in accordance with their listing and the manufacturers ' instructions. They re'aT-shall be oermit ted to be installed in or attached to combustible material.

[(b) through (d) Unchanged.]

(e) Panels, grilles, and access doors that m'as'e are required to be removed for normal servicing operations shall not be attached to the buildingo

For additional information on the venting of wall furnaces, consult Part 7 in this Code.


6.30 Water Heaters.

6.30.1 Pro hibited Instullations.

(a) Water heaters shall not be installed in bathrooms, bedrooms, or any occupied rooms normally kept closed. Also see 5.1.8 for flammable vapors.

Exception ~ Direct-vent water heaters.

Exceotion No. 2: Water heaters shall be oermit ted to be installed in a closet located in a bathroom, bedroom~ or any occuoied room normaUv kent closed where the closet is used exclusively for a water heater. Where the enclosed snace has a weather-striot)ed solid door with ~ self-closing device, and where all combustior~ all is obtained from the outdoors.

[(b) Unchanged.]

[6.30.2 Location. Unchanged.[




6.30.9* Anti-Siphon Devices. Means acceptable to tile authority having jurisdiction shall be provided to prevent s iphoning in any water heater or any tank to which a circulating water heater i~

that incorporates a cold water inlet ~ tube is attached.

[6.31 Unchanged.]

[6.25.4 Combustion and Ventilation Air. Unchanged.]

[6.25,5 Means for Heat or Exposure Limitation. Unchanged.]

[Figure 9 Uncbanged.]

[6.26 Stationary Gas Engines. Unchanged.]

Part 7 Venting of Equipment

[7.1 General. Unchanged.]

7.2 Specification for Venting.

[7.2.1 Connection to Venting Systems. Unchanged.]

871

N F P A 54 ~ A 9 6 R O P

This page shows only the portions of NFPA 54 as changed by the actions on

7.2.2 Equipment Not Required to Be Vented.


(d) Clothes dryers. (See Section 6.4A

(e)'l" A single listed booster-type (automatic instantaneous) water heater, when designed and used solely for the sanitizing rinse requirements ofa dishwashing machine, provided that the ~mtt-r eauioment is installed, with the draft hood in place and unaltered, if a draft hood is required, in a commercial kitchen having a mechanical exhaust system; where installed in this manner, the draft hood outlet shall no tbe less than 36 in. (91 cm) vertically and 6 in. (15 cm) horizontally from any surface other than the ~ equipment.

[(f) through (k) Undmnged.]

~ any or all of this equipment is installed so the aggregate input rating exceeds 20 Btu per l,,,a, vci cubic 2~e,t u.c_u_~ft (207 watts per m3) of room or space in which it is installed, one or more shall be provided with venting systems or other approved means for removing the vent gases to the outside atmosphere so the aggregate input rating of the remaining unrented equipment does not exceed file 20 Btu per h,,u; p,,., cubic f~,c,t hr per cu ft (207 watts per m3) figure. Where the room or space in which the equipment is installed is direcdy connected to another room or space by a doorway, archway, or other opening of comparable size that cannot be closed, the volume of such adjacent room or space ~'ray-s_ha![_b~ permitted to be included in the calculations.

7.2.3 Ventilating Hoods. Ventilating hoods and exhaust systems shall be permitted to be used to vent gas utilization equipment installed in commercial applications (see 7.3.5) and to vent industrial equipment, particularly wi,ret,rwhere file process itself requires fume disposal. (See 5.1.6 and 5.1.8.)

[7.2.4 Well-Ventilated Spaces. Unchanged.]

7.2.5 Direct-Vent EquipmenL Listed direct-vent gas utilization equipment shall be considered properly vented wi~rr where installed in accordance with file terms of its listing, the manufacturer's instructions, and 7.8(c).

7.2.6 Equipmentwlth Integral Vents. Gas utilization equipment incorporating integral venting means shall be considered properly vented ~ where installed in accordance with its listing, the manufacturer's instructions, and 7.8(a) and (b).

7.3 Design and Construction.


7.3.4 Mechanical Draft Systems.

(a) Gas utilization, cxccv;.~..c~i~c,at...o, equipment requiring venting shall be permitted to be vented by means of mechanical draft systems of either forced or induced draft design.

Exception: Incinerators.

[(b) and (c) Unchanged.]

(d) ~ aX~a_¢~ a mechanical draft system is employed, provision si3all be made to prevent the flow of gas to the main burners when the draft system is not performing so as to satisfy the operating requirements of the equipment for safe performance.

[(e) Unchanged.]

(f) Mechanical draft systems shall be sized and installed in accordance with the terms of their listin~ and the manufacturers' instructions.

proposals on pages 812 through 862, printed as an aid to the reviewer.

17.4.2 and 7.4.3 Unchanged.]

7.5 Masonry, Metal, and Factory-BuRt Chimneys.


7.5.3 Size of Chimneys. The effective area of a chimney venting system serving listed gas appliances with draft hoods, Category I appliances, and other appliances listed for use with Type B vents shall be in accordance with Part 11 or other approved engineering methods.

Exception No. 1: As an alternate method of sizing an individual chimney venting system for a single appliance with a draft hood, the effective areas of the vent connector and chimney flue shall be not less than the area of the appliance flue collar or draft hood ouflet~ nor m-eater than seven times the draft hood outlet area.

Exception No. 2: As an alternate method for sizing a chimney venting system connected to more than one appliance, all with draft hoods, tile effective area of the chimney flue shall be not less than the area of the largest vent connector plus 50 percent of the area of additional flue collars or draft hood outlets, nor wreater than seven times tile smallest draft hood outlet area.

Where an incinerator is vented by a chimney serving other gas utilization equipment, the gas input to the incinerator shall not be included in calculating chimney size, provided the chimney flue diameter is not less than 1 i l~ 'r in. (2.54 cm) larger in equivalent diameter than the diameter of the incinerator flue outlet_


[Figure 12 Unchangedl

7,5.8 Snace Surroundin~ Linin~ or Vent. The remainin~ st~ace surrouddjng a chimney liner. ~ vent_ special uas vent. or plastic nioin~r installed within a masonry chimn'ev flue~shall not be used to L . v

vent another appliance.

Exceotion: The insertion of another liner or vent within the chim'nev as nrovided in this Code and the liner or vent manufa~:tur~r's instructions.

7.6 Gas Vents. (See Section 1.7, Definitions.)

7.6.1 Application.


(d) Type B or Type L vents shall extend in a generallyvertical direction with offsets not exceeding 45 degrees, except that a vent system having not more than one 60-degree offset shall be permitted.

Any angle greater than 45 degrees from the vertical is considered horizontal. Tile total horizontal distance of a vent plus the horizontal vent connector serving draft hood-equipped appliances shall not be greater than 75 percent of the vertical height of the vent_

Exception: E;,gk,cc,cd a)zLci;,a Systems designed and sized as provided in ~ow- . Part 11 or in accordance ,~ith other approved enmneerin~ methods.

v

Vents serving Category I fan-assisted appliances shall be installed in accordance with the appliance manufacturer's instructions and Part 11 or other approved engineering methods.

[(e) Unchanged.]


[Figures 13 and 14 Unchanged]

[7.3.5* and 7.3.6 Unchanged.]

7.4 Type of Venting System to be Used.

7.4.1 The type of venting system to be used shall be in accordance with Table IX.

7.7 Single-Wall Metal Pipe.


[Table X Unchanged]

[Table IX Unchanged.]

872

N F P A 54 - - A 9 6 R O P


7.7.4 Size of Single-Wall Metal Pipe.

(a) * A vent ing system of a single-wall metal pipe shall be sized n r ~ co,,a~, u~ccl in accordance with ~ V t - " , , ~ d c u g ; , , ~ ' h " s one of the following me thods and the gas e q u i p m e n t manufac tu re r ' s inswuc- tions:

2. Appliances Not Installed in Attics. Vent connectors for listed gas appliances having draft hoods and for appliances having draft hoods and equ ipped with listed conversion burners , which are n o t installed in attics, shall be one of the followinm

ofa . Type B or Type L vent material; or

1. For a draft hood-equ ipped appliance, in accordance with Part 11~

b. Galvanized sheet steel no t less than 0.018 in. (0.46 mm ) thick: o r

Exccvf i . a Nu. I. ,%; a . ~lz . . . . . ; . . . . . d , . d ~ a~A..s 2. For a vent ing system for a single appliance with a draft l-,.~od v. ly , ¢hc cff~cdvc

hood, the areas of the connector and the pipe each shall no t be less than the area of the appliance flue collar or draft hood,~mk' t r outlet, whichever is smaller. The vent area shall no t be creater than seven times the draft hood outlet area.

E..cct.d.... No. 2. ~% o~J .Izc,..acc ,~.cz',,~2 ~ fG, a:zh~. 3. For a vent ing system c o . . c o o e d co for more than one ap~..:~,cc, in a single room. all having draf t hoods, the ~ area of the pipe shall ~ no t be less than the area of the largest connector plus 50 percent of---~-e~e area of the addit ional .'lac co.'l,., a o; draft hood outlets. The ven t area sh-a-ii-not be creater than seven t imes the smallest draf t h o o d out let area.

E. .~ct ,d+. No. 3: Tl,c ;iz:,~g ,X a;,~glc-.;,dl ;~cz..l tAt.c : '~, , . , . ; .u, ,,.i

c. A l u m i n u m (1100 or 3003 alloy or eouivalent~ shee t no t less than 0.027 in. (0.69 ram) thick: or

d. Stainless steel shee t no t less than 0.012 in. (0.31 m m ) thick: or

,,-,azc,~,,l' c,i- e. Smooth interior wall metal pipe having resistance to hea t and corrosion ,,,,t ;col d , ~ that , , / g ,d .~Azcd al,cct zzccl c,;

tha t o fb . c. or d above: or

.~,.~.. . . . . . . , - ; . ~ w , ~ . . . . . . . : . . . . . . L°7~y , '* ' y ' . ° ~ ' 7 ~ ' _ y ' _ v , "- ~"t.""~ " ,

f. A listed ven t connector .

3. Vent connectors shall no t be covered with insulation.

4. O the r annroved enk:rineerinlz methods .

[(b) and (c) Unchanged . ]

[7.7.8; and 7.7.6 Unchanged . ]

7.8* Venting System Location.

(a) A vent ing system :;hall te rminate at least 3 ft (0.9 m) above any forced air inlet located within 10 ft (3.1 m).

Exception No. 1: This provision shall no t apply to the combust ion air intake of a direct-vent appliance.

Exception No. 2: This provision shall no t apply to the separat ion of the circulating air inlet and verrt ~ discharge of listed outdoor appliances.

[(b) Unchanged . ]

(c) The vent terminal of a direct-vent appliance with an input of 10 000 Btu per ~ t - ( - k a ~ hr_L~ kw) or less shall be located at

least 9 ; ; ,d.ca (2~, ~ ' ) 6 ila. (150 mm~ from any ~ open ing ~n'~ngt'r v&.ich g~c g~.ca c6~',d c,,tc~ i n t o a building, and such an appliance with an inpu t over 50,,';.~, Bt~ w , ,~'~, (I ~..7 k;.) sha l l , ~qa: ,c ~ 12-

10.000 Btu Der h r (3 kw) bu t no t over 50.000 Btu ne t h r (14.7 kw) shall be installed with a 9-in. (23-cm) vent terminaiJon clearance and an appliance with an inpu t over 50.000 Bm per hr (14.7 kw~ shall be at least a 12-in. (30-cm) vent te rminat ion clearance. The bot tom of the vent terrninal and the air intake shall be located at least 12 in. (30 cm) above grade.

[(d) and (e) Unchanged , ]

[7.9 Condensat ion Drain. Unchanged . ]

7.10 Vent Connectors for Category I Gas Utilization Equipment .

[7.10.1 Where Required. Unchanged . ]

7.10,2 Materials.

[(a) Unchanged . ]

(b) Vent connectors for residential-type appliances shall comply with the following:

1. Appliances Installed in Attics. Vent connectors for listed gas appliances having draft hoods and appliances listed for use with Type B gas v e n t s ~ tha t are installed in attics shall be of Type B or Type L vent material.

Exception: Listed insulated vent connectors shall be installed according to the te rms of their listing.

[ (c) Unchanged . ]

(d) Vent connectors for mediurn-heat e q u i p m e n t and commercial and industrial incinerators shall be constructed of factory-builk med ium-hea t ch inmey sections or steel of a thickness no t less than that spec i f ed in Table K-at;-, XII. and shall comply with the following:

[1 t h rough 4 Unchanged . ]

[Table XI Unchanged ]

[Table XII Unchanged]

[7.10.3 th rough 7.10.9 Unchanged . ]

7.10.10 Length of Vent Connector.

(a) A vent connector shall be as shor t as practical and the gas utilization e q u i p m e n t sh__h._alL~ located as close as practical to the ch imney or vent.

(b)* :F '~ Where so indicated bv the applicable tables in Part 11. the horizontal length o f n v e n t connector to a natural draft ch imney or vent serving a single draft hood-equipped appliance shall rtt, t 4 ~ rr~-e-th-nrr be nermi t ted to be 75 percent or more of the he igh t of the vertical por t ion of the ch imney or vent above tile vent connector.

Exccpfi.~u: \ 'c,~t ozo:.c . . . . . ~,;..-ddc~ ~.. P.~t 11 0, ;.. acco.-R~.cc ~dd~ -fl,~, " - vv , ~;cd c.S~.,cc, ; . g ,~,cd,~d~.

[7.10.11 th rough 7.10.16 Unchanged . ]

[7.11 and 7.12 Unchanged . ]

7.13 Manually Opera ted Dampers . A manual ly opera ted da m p e r shall no t be placed in the vent connector f rom any gas utilization

,li,.,tJCi~.6,. Fixed baffles shall no t be classified as manual~Sy operated dampers .

Exception: A connector servin~ a listed ~as-fired incinerator where r e c o m m e n d e d bv tile incinerator manufac tu re r and installed in accordance with "file instructions accomnanvin~ tile incinerator.

[7.14 Automatically Opera ted Vent Dampers . Unchanged . ]

873

N F P A 5 4 - - A 9 6 R O P


7.15 Obstructions. A device flaat retards the flow of vent gases shall not be installed in a vent connector, chimney, or vent

Exception No. 1: Draft regulators and safety controls (1) specifically listed for installation in venting systems and installed in accordance with the terms of tbeir listing, and (2) designed and installed in accordance with approved engineering methods and approved by the authority having jurisdiction.

Exception No. 2: Listed beat reclaimel~ and automatically operated vent dampers installed in accordance with the terms of their listing.

Exception No. 3: Approved economizers, heat reclaimers, and recuperators installedin venting systems of equipment not required to be equipped with draft hoods, provided the ~as utilization eauioment manufacturer's instructions cover tl~e installation of such a ~tevice in the venting system and performance in accordance with 7.3.1 and 7.3.2 is obtained.

Tables in Part 11 shall not apply where the equipment covered in Section 7.15, Exception No. 1, 2, or 3 is installed in the vent. Other approved engineering methods shall be used to size these vents.

Part 8 Procedures to Be Followed to Place Equipment in Operation


[Table XIII Unchanged]

Part 9 Modifications to Existing Appliance Installations for the Purpose of Fuel Conservation

9.1 Safety Inspection. Prior to ~c;.~,,,pG,,~ ~,,r . . . . d ~ G . . . . modification being attemoted, a safety inspection of the existing appliance installation shall be performed by a qualified agency performing the modification.

[9.2 Reduction of Vent Connector Size. Unchanged.[

9.3 Automatic Vent Damper Device Installation. A listed automatic vent damper device shall be permitted to be installed ~ in a vent

an existing appliance i~&.llaG,,,provided the appliance is listed and equipped with a draft hood andprovided the device is installed by a qualified agency (see Section 1.4) in accordance with the terms of its listing. The name of the installer and date of installation shall be marked on a label affixed to the damper device.

NOTE: For recommended procedures for installing automatic vent damper devices on existing appliance installations, see Appendices I,J, and K.

Part 10 Sizing Tables

Due to the extensive revisions and the addition of several new tables, the new order of Part 10 will be as follows:

[Tables 10.1 through 10.4: Existing Tables 10.1 through 10.4 Unchanged.]

Table 10.5: New

Table 10-5 Maximum Capacity o f Pipe in Cubic Feet o f Gas per H o u r for Gas Pressures o f 0.5 psi or o f Less and a Pressure Drop o f 1.0 Water Column

Use this table to size tubing from house line regulator to the appliance

Length 1/4in. 3 /8 in . Feet (0.315 in.) (0.430 in.)

Diameter: Inside (Outside) 1/2 in. 5/8 in. 3/4 in. 1 in. 1 1/4 in.

(0.545 in.) (0.666 in.) (0.785 in.) (1.025 in.) (1.265 in.)

10 42 95 177 15 34 76 142 2O 29 65 122 30 23 52 98 4O 2O 45 84 5O 18 40 74 60 16 36 67 70 15 33 62 80 14 31 57 90 13 29 54 100 12 27 51 125 11 24 45 150 10 22 41 175 9 2O 38 200 8 19 35 250 7 17 31 300 7 15 28

300 461 928 1612 241 370 745 1294 206 317 638 1108 165 255 512 890 142 218 439 761 125 193 389 675 114 175 352 611 105 161 324 563 97 150 301 523 91 1 4 0 283 491 86 133 267 464 76 118 237 411 69 107 215 372 64 98 197 343 59 91 184 319 53 81 163 283 48 73 147 256

874

N F P A 5 4 - - A 9 6 R O P


[Tables 10.6 througtl 10-9: Existing Tables 10.5 th rough 10.8 Unchanged . ]

Table 10.10: New

Table 10-10 Pipe Sizing Table for 2 psig Pressure Capacity of Pipes of Different Diameters and Lengths in Cubic Feet per Hour for an Initial Pressure of 2.0 psig with a 1.0 pslg Pressure Drop and a Gas of 0.6 Specific Gravity

Pipe Size of 10 Schedule 40 Standard Internal

Pipe Diameter (Inches) /Inches)

1/2 .622 314 .824 1 1.049 1 1/4 1.380 1 I/2 1.610 2 2.067 2 1/2 2.469 3 3.068 4 4.026

20 I 30 I 40 m 50 I 60 I 70 I 80 I 90 I 100 I 125 I 150 I 175 I 200

~ I ~ ~ I ~ I I ~ I I ~ I I ~ I I ~ I I [ * ~ : l I I l*l I ~ I I~I*~,'~t ~ I I ~ I ~ ~ I ~ 9 ~ ! ~ i ~d ,TJ ,~ i ~ : l i ~ J ~ I I ~ t : ~ I I l:~5,~I I ~ I ~ ,~ ~ - ' I I ~ g ~ I I ~ * I I I ~ I I ~

~:1 ~ I I , ~ 5 ~ i ~ : ~ I I [ ~ i i , i I I ~ i I ~ i ~ I ~ I ~ l ~ ~ ~ ~

Table 10.11: New

Table I0-11 Pipe Sizing Table for 5 psig Pressure Capacity of Pipes of Different Diameters and Lengths in Cubic Feet per Hour for an Initial Pressure of 5.0 psig with a 3.5 psig Pressure Drop and a Gas of 0.6 Specific Gravity

Pipe Size of Schedule 40

Standard Pipe

(lnches /

1/2 3 / 4 1 1 1/4 1 1/2 2 2 1/2 3 4

Internal Diameter 10 (~ches}

.622

.824 1.049 []f]~ 1.380 fl[~ 1 . 6 1 0

2.067 2.469 3.068 "

4.026

20 I 30 I 40 I 50 i 6 i 70 I 80 i 90 I lOO i 125 I 150 I 175 I 200

~ ll~3.]Im~m ~ m I ~ 12~)~i igE~IPi ~ ~ mm~l:i Ilr/~m ~ i l ~ m-~

[Tables l0.12 th rough 10.16: Existing Tables 10 .9f lEough 10.13 Unchanged ]

Table 10.17: New

Table 10-17 Sizing Tab le for 2 ps ig P r e s su re T u b i n g Capaci ty o f T u b i n g o f Di f fe ren t Diamete r s and Leng ths in Cubic Feet Pe r H o u r (CFH) a 17 in. Wate r C o l u m n Pres su re Drop and a Gas o f 0.6 Specific Gravity f r om Poin t o f Delivery to Line Regula tor

Diameter : Ins ide (Ou~ ide ) Leng th 1 /4 in. 3 / 8 in. 1 /2 in. 5 / 8 in. 3 / 4 in. 1 in. 1 1 /4 in.

Feet (0.315 in.) (0.430 in.) (0.545 in.) (0.666 in.) (0.785 in.) (1.025 in.) (1.265 in.)

10 201 454 845 1435 2200 4428 7690 15 161 364 678 1152 1766 3556 6175 20 138 312 581 986 1512 3044 5285 30 111 250 466 792 1214 2444 4244 40 95 214 399 678 1039 2092 3632 50 84 190 354 601 921 1854 3219 60 76 172 320 544 834 1680 29 t7 70 70 158 295 501 768 1545 2684 80 65 147 274 466 714 1438 2496 90 61 139 257 437 6 7 0 1349 2342 100 58 131 243 413 633 1274 2213 125 51 116 215 366 561 1129 1961 150 46 105 195 332 508 1023 1777 175 43 96 180 305 468 941 1635 200 40 90 167 284 435 876 1521 250 35 80 148 251 386 776 1348 300 32 72 134 228 349 703 1121

875

oo

Table 10-18 Maximum Capacity of Semi-Rigld Tubing in Cubic Feet of G a s p e r H o u r for a Gas Pressure of 2.0 pslg or Less and a Pressure Drop of 1.0 psig (Based on a 0.6 Specific Gravity Gas)

Leng th of Tubing, Feet Nomina l Tubing

Diameter Internal Inside Diameter 5 10 15 20 30 40 50 60 70 80 90 100 125

(inches / ( Inches /

1/4 0.315 3/8 0.430

g7~ "6"AF¢'--

1 1/4 1.265 1 1/2 1.505 2 1.985 2 1/2 2.465

150 175 200 250 300

~,) $91, |(~ m~(ll il~ mm,~ mm,~ ill mle_', ~:~ l'] "" ld~ 65 59 54 49 43 *[!][~ ~ i ~ ] , ~ l l m,1 ,'l: I~-'.,. IK~t. 1~9~ m~,[--~ ~m_ i~o i~_- ~s l Ifl[~] ~ 151 139 124 119 102

289 268 246 217 195

17847 12748 10198 8923 7309 6374 5694 .5184 4759 4419 4164 3994 3627 3229 3017 2804 2507 2295 26345 18696 15297 12748 11048 9548 8328 7649 6969 6544 6119 5779 5184 4759 4419 4154 ?,654 3399 49291 34843 28894 24645 20396 16997 15297 14447 12748 11898 11473 10623 9603 8838 8245 7549 6884 6289 76485 54390 44192 38245, 30594 27195 23795 22096 20396 18696 17847 16997 15297 13597 13172 11898 10623 9773

z

~° @

Z

t~

g~

"¢ Z

-~. OI

o I

L,o

~o

m o

$.

o0 ..,ff

Table 10-19 Maximum Capacity of Semi-Rigid Tubing in Cubic Feet of G a s p e r Hour for a Gas Pressure of 5.0 psig or Less and a Pressure Drop of $.5 pslg (Based on a 0.6 Specific Gravity Gas)

Nomina l Tub ing

Diameter Inside

( inches) I lO i ]~ i ~ i 3o i 4o i ~ i 6o i 70 i 8o i 9o i ]0o i ]~ i i~o 175 I 20O I 250 I 300

]14 s/8 i/2 5/8 s/4 1 ] 1/4 1 I/2 2

I/2

.~l~m m ~ m ~ m ~ m m~.~-m ~ m ~ m m ~ m ~ m m m~m m ~ m m ~ m ~ m ~ m ~ m ~ ~ ~

i.

Z

Z

° I

o

i,

N F P A 54 - - A 9 6 R O P


[Tables 10.20 and 10.21: Existing Tables 10.14 and 10.15 Un- Table 10.23: New changed]

Table 10.22: New

Table 10-22 Polyethylene Plastic T u b e Sizing


Max imum undi lu ted p ropane capacities listed are based on 11 in. W.C. set t ing and a 0.5 in. W.C. pressure drop Capacities in

1,000 B t u / h r

Plastic Tub ing Length Feet

10 20 30 40 50 60 70 80 90 100 125 150 175 200 225 250 275 3O0 350 400

Plastic Tub ing Size (CTS) (dimensions in parenthesis are inside diameter)

1 /2 in. CTS SDR 7.00

(.445)

121 83 67 57 51 46 42 39 37 35 31 28 26 24 22 21 2O 19 18 16

1 in. CTS SDR 11.00

(.927)

829 569 457 391 347 314 289 269 252 238 211 191 176 164 154 145 138 132 121 113

Table 10-23 Polyethylene Plastic Tube Sizing


Maximum undiluted propane capacities listed are based on 10 psig first stage setting and 1 psig pressure drop

Capacities in 1,000 B tu /h r

Plastic Tubing Length Feet

30 40 5O 60 7O 8O 90 100 125 150 175 2OO 225 25O 275 300 350 400 45O 5OO 6OO 7OO 8OO 90O 1000 1500 2OOO

Plastic Tubing Size (CTS) (dimensions in parenthefis are inside diameter)

1/2 in. CTS 1 in. CTS SDR 7.00 SDR 11.00

(.445 / /.927)

762 5225 653 4472 578 3964 524 3591 482 3304 448 3074 421 2884 397 2724 352 2414 319 2188 294 2013 273 1872 256 1757 242 1659 230 1576 219 1503 202 1383 188 1287 176 1207 166 1140 151 1033 139 951 129 884 121 830 114 784 92 629 79 539

878

N F P A 54 - - A 9 6 R O P


Table 10.24: New

Table 10-24 Polyethyle~ne Plastic Pipe Sizing

Sizing Between First Stage and Second Stage Regulator

Maximum undiluted propane capacides listed are. based. . on 10 psig first stage setting and 1 psig pressure drop Capacmes m 1,000 Btu/hr

Plastic Pipe

Length Feet

30 4O

- - ogF"- - ' - - - 6 - F - ' - - - - - - W

80 90 100 125

250

500 600

- - 0 0 " V 5 " 6 - - 8OO 9O--5-'-"--

100-'6"0"F~

2000

I /2 in . SDR 9.33

(.660)

2143 1835 1626 1473 1355 1261 1183 1117 990 897 826 678 721 681 646 617 567 528 495 468 424 390 363 340 322 258 221

3/4 in. SDR 11.0

(.860)

4292 3673 3256 295O 2714 2525 2369 2238 1983 1797 1653 1539 1443 1363 1294 1235 1136 1057 992 937 849 781 726 682 644 517 443

l]b'~'tic pipe nominal outside diameter Idimensions in parenthesis are inside diameter

l in . 1 1/4 in. SDR 11.00

(1.077)

7744 6628 5874 5322 4896 4555 4274 4037 3578 vz~

2603 2459 2336 2228 2050 1907 1789 1690 1531 1409 1311 1230 1162 933 798

SDR 10.00 (1.328)

13416 11482 10176 9220 8483 7891 7404 6994 6199 5616 5167 4807 4510 4260 4046 3860

3551 3304 3100 2928 2653 2441 2271 2131 2012 1616 1383

1 1/2 in. SDR 11.00

I1.554)

20260 17340 15368 13924 12810

2in. SDR 11.00

/1.943)

36402 31155 27612 25019 23017

11918 21413 11182 10562 9361 8482 7803 7259 6811 6434 6111 5830 5363 4989 4681 4422 4007 3686 3429 3217 3039 2441 2089

20091 18978 16820 15240 14020 13043 12238 11560 10979 10474 9636 8965 8411 7945 7199 6623 616l 5781 5461 4385 3753

Existing Table 10.16 Has been deleted

[Table 10.25: Existing Table 10.17 Unchanged]

Table 10.26: Existing Table 10.18, revised by substituting "15" for "14" in the first column.



Table 10.29: New



Fable 10-29 Maximmn Capacity of CSST in Cubic Feet per Hour for G as Presst~re of 2 psi and a Pressme Drop of 1 psi (Based on 0.60 Specific Gravity Gas)*

Tubin~ Lenl~th (It) EHD** Flow Designation 10 25 30 40 50 75 80 110

13 270 166 151 129 115 93 89 79 15 353 220 200 172 154 124 120 107 18 587 374 342 297 266 218 211 189 19 700 444 405 351 314 257 249 222 23 1098 709 650 567 510 420 407 366 25 1372 876 801 696 624 512 496 445 30 2592 1620 1475 1273 1135 922 892 795 31 2986 1869 1703 1470 1311 1066 1031 920

150 200 250 300 400 500

64 55 49 44 38 34 87 75 67 61 52 46

155 135 121 110 96 86 182 157 141 129 111 100 302 263 236 217 189 170 364 317 284 260 225 202 646 557 497 453 390 348 748 645 576 525 453 404

Table does not include effect of pressure drop across the line regulator. If regulator loss exceeds 3/4 PSI (Based on 7 in. WC outlet pressure. DO NOT USI~ THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may wary with flow r a t e . ~UTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.

*Table includes losse.,; for four 90 degree bends and two end fittings. Tubing runs with larger number of bends and/or fittings shall be increased by an equivalent length of tubing according to the following equation: L-1.3n where L is additional length (ft) of tubing and n is the number of additional fitdngs and/or bends


879

N F P A 54 - - A 9 6 R O P


Table 10.32: New

Table 10-32 Maximum Capacity of CSST in Thousmads of Btu per Hour of Undiluted Liquefied Petroleum Gases at a Pressure of 2 psi and a Pressure Drop of 1 psi

(Based on 1.52 Specific Gravity Gas)*

Tubing Length (ft) EHD** Flow Designation 10 25 30 40 50 75 80 110 150 200 250 300 400 500

13 426 262 238 203 181 147 140 124 101 86 77 69 60 53 15 558 347 316 271 243 196 189 169 137 118 105 96 82 72 18 927 591 540 469 420 344 333 298 245 213 191 173 151 135 19 1106 701 640 554 496 406 393 350 287 248 222 203 175 158 23 1735 1120 1027 896 806 663 643 578 477 415 373 343 298 268 25 2168 1384 1266 1100 986 809 7684 703 575 501 448 411 355 319 30 4097 2560 2331 2012 1794 1457 1410 1256 1021 880 785 716 616 550 31 4720 2954 2692 2323 2072 1685 1629 1454 1182 1019 910 829 716 638

Table does not include effect of pressure drop across the fine regulator, ffreguhtor loss exceeds 1/2 PSI (Based on 13 in. WC outlet oressure. DO NOT USE THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.

*Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger number of bends and/or fittings shall be increased by an equivalent length of tubing according to the following equation: L-1.3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends.



Part 11 Siting of Category I Venting Systems

11.1 Definitions. The following definitions apply to tables in this parL

-1-r. Appliance Categorized Vent ,'~ ~ / D ~ . . . . ~ , . Diameter/Area. The min imum vent area /d iameter permissible for Category I .appliances to maintain a nonpositive vent static pressure when tested m accordance with nationally recognized standards.

Exterior Masonry. Cbimnevs. Masonry chimneys exposed to the outdoors on one or more sides below the roof line.

[2. Unchanged.]

~ L m ~ t l ~ t ~ u l ~ v ~ t l t .

6 L + L t l L U L + U l ~ V~LJL ,

ven~Tl,,.:~ ~ . ,/ . . . . !.;A . . . . . . . . vvl : . . . . :;@~.C . . d . s o i'+, ~... &,~%

FAN Min. The minimum innut ratine of a Category I. fan-assisted appliance attached to a vent or connector.

FAN Max. The maximum input radn~ o f • Category. I fan-assisted aooliance attached to a vent or connector.

NAT Max. The m a x i m u m inout radn~ of a Category 1. draft hood- equiooed annliance attached (o a vent or connector.

[ 6 through 8 Unchanged.]

-1-0r NA. Vent configuration is not permitted due to potential for c o n d e n s a t e f o r m a t i o n or pressurization of the venO~g system, or n o t applicable due to physical or geometric c, , , .ohd, ,~, .

Notes for Single Apliance Vent Tables have been renumbered as 11.2.1 through 11.2.14.

11.2 Additional Reauirements to Single Appliance V e n t - Tables 11-1 through 11-5.

[ 1 and 2 Unchanged]

~r. 11.2.3 Single-appliance venting configurations with zero (0) lateral lengths in Tables 11-1, 11-2, and 11-5 shall have no elbows in the venting system. For vent configurations with lateral lengths, the venting tables include allowance for two 90-degree turns. For each additional 90-degree turn, or equivalent, the maximum capacity listed in the venting tables shall be reduced by 10 percent (0.90 x maximum table capacity). NOTE; T;;,, 45~Icg, cc ~,,,,,s o~, Twoor more turns, the combined an~les of which eaual 90 degrees, shall be considered equivalent to one~0-degree turn2


e ~ T • e t t 1 1 . • i ¢ ~ x . ~ l l 1 1 ~ 1 1 • . 1 1 ~

. 1 . , , l ~ L ~ I ~ * _ - r ,i _ - J ,~ J ] £ - , ,

[7. Unchanged.]

8:. 11.2.7 Listed corrugated metallic chimney liner systems in masonry chimneys shall be sized by using Table 11-1 or 11-2 for Type B vents with the maximum capacity reduced by 20 percent (0.80 x maximum capacity) and the min imum capacity as shown in Table 11-1 or 11-2. Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity ,~ddb".G,-.'.ly ;~d~cd . (5cc N,,tc 3.) further reduced in accordance with Note 3.

[9. Unchanged.]

i ~,. T ' , , ~bl~o ; , ,~i ,d,d ;,, d,~z P~ t 11.2.9 Tables 11-1.11-2. 11-3. 11-4 and 11-5 shall be used for chimneys and vents not exposed to the outdoors below the roof line. C,',;,,,,,¢zo .,, vcuto ¢xv,,o~d z,, d,~

. . . . . . . . . "'" ~ v ' - ' ~,.uc,. c t ,G, ,u tu~ ~ ,Ad , . ' , ~ u u L u ~ a o u ~ l ~ , , u l ~ | ~ & l z t a ~ l l ~ 7

Type B vent or listed chimney lining system passing through an unused masonry chimney flue shall not be considered to be exposed to the outdoors. Table 11-3 in combination with Table 11-11 shall be used for flay-tile-lined exterior masonry, ch imney, provided:

(al Vent connector is Tvoe B double-wall, and

(b) Vent connector l en~h is limited to 1 1/2 ft (0.46 m / f o r each inch of vent connector diameter, and

880

N F P A 54 ~ A 9 6 R O P


(c) The appliance is draft hood-equipped, and

(d) The inpu t ratin~ i,; less than the m a x i m u m capacity given by Table 11-3. a~nd

(e) For a space-heat ing appliance, the inpu t ratin~ is greater than the m i n i m u m capacity ~iven by Table 11-11.

If these Conditions cmmot be m e t an alternative vent ing design shall be used. such as a listed ch imney linin~ system.

Excention: The instalhvion of vents servin~ listed anoliances shall be nermi t ted to be in accordance with the ~ppl ianc~ 'manufacturer ' s instructions and the te rms of the listinm

[11 th rough 14 Unchanged . ]

Due to revisions and the addit ion of new tables, the new order of Part 11 will be as follows:

[Tables 11.1 a n d 11.2: Existing Tables 11.1 and 11.2 Unchanged]

Tables 11.3 th rough 11.5: Existing Tables 11.3 th rough 11.5, revised by dele t ing all asterisks "*" in Table and delet ing "See Note 6. ~

11.3 Additional Refluirements to Multinle Aooliance Vent Tables 11-6 th rough 11-13.

[1 darough 3 Unchanged . ]

[Table Unchanged . ]

[(a) Unchanged . ]

(b) T-at~ For a connec tor servin~ a fan-assisted anoliance, the m i n i m u m capacity (FAN Min) o ( t h e coonector sfi~dl be de te rmined by r efe orfi~n ~ to, .the corre!~pondi,'ng single app.lian_ce ;~b}c !T~blc, l l.-I

. . . . . . table. For Tvoe B double-wall connectors . Table 1 l-1 shall be used. For single-x~r:Ml connectors. Table 11-2 shall be used. The he igh t (H) and lateral (L) shall be measu red according to the nrocedures for a single appl iance vent, as if the other appliances were not p r e s e n t

~. 11.3.4 If the vent connectors are combined prior to en ter ing die c o m m o n vent, the m a x i m u m c o m m o n vent capacity listed in the c o m m o n vent ing tables shall be reduced by 10 percent (0.90 x m a x i m u m c o m m o n vent capacity). The length of the c o m m o n vent connector manifold x~L-~-LI~]3_ shall no t exceed 1 1 /2 ft (18 in.) for each inch (18 cm per cm) of c o m m o n vent connector manifold diameter (D). (See Figure G-II.)

~. 11.3.5 If the c o m m o n vertical vent is offset as shown in Figure G- 12, the m a x i m u m c o m m o n vent capacity listed in the c o m m o n vent ing tables shall he r educed by 20 percen t (0.80 x m a x i m u m c o m m o n vent capacity), the equivalent of two 90-degree turns. The horizontal length of the c o m m o n vent offset ~ ~ shall no t exceed 1 1 /2 f t f o r each inch (18 cm per cm) of c o m m o n vent d iameter (D).

~. 11.3.6 Excluding elbows coun ted in Note 5, for each addit ional 90-degree tu rn in excess of two, the m a x i m u m capacity o f that por t ion of the vent ing system shall be reduced by 10 percent (0.90 x m a x i m u m c o m m o n vent capacity). N@TE: T,,G 4 5 - ~ g , cc t~ac~s o~c

Two or more turns, the combined an~les of which eoual 90 de~rees. shall be considered equivalent to one 90-degree turn.

11.3.7 The cross-sectional area of the c o m m o n vent shall be eoual to or greater than the cross-sectional area of the largest connector .


11.3.10 Connec to r rise (R) for each anol iance connector shall be measured f rom the draft h o o d outlet or flue collar to the centerl ine where the vent was s treams come to~ether.

aqgr~ 11.3.11 For mult iple units of gas utilization equ ipmen t all located on one floor, available total he igh t (H) shall be measu red f rom the h ighes t draft h o o d outlet or flue collar up to the level of the cap ,,; ~c, ,,~aal. C,)c~ . . . . ~;., i;~c (R) sLal; bc a~Co.,u, cd f, ,,i~ d,~ & ~ t k,,,od outlet ,st ,qac c,,l 'ar to d-,c level wI,c,c d ,c vc~.t g,~ ;k, can-~ c.smc ~.Ggcd,ci (nut appli ,~blc t,, ,aaaldstc,17). of tile c o m m o n vent•


11.3.14 Where used in multistory systems, vertical c o m m o n vents shall be Type B double-wall and shall be installed with a listed vent can. A multistorv c o m m o n vertical vent shall be permi t ted to have ~ a single offset provided;

(a) The offset an~le does no t exceed 45 degrees, and

(bl The horizontal length of the offset does no t exceed 1 1 /2 ft (0.46 m~ for each inch ( i8 cm oer c m / o f c o m m o n vent d iameter of the segrnent in which the offset is located, and

(c~ For the s e g m e n t of the c o m m o n vertical ven t conta in ing the offset, the c o r r ~ o n vent canacitv listed in the c o m m o n ventir '~ tables is reduced by 20 oercen t (0.80 x m a x i m u m c o m m o n vent canacitv~, and

(d) A multistorv c o m m o n vent shall no t be reduced in size above me offse~

[14 and 15 Unchanged . l

~ Listed, corrugated metallic ch imney liner systems in masonry chimneys shall be sized by us ing Table 11-6 or 11-7 for Type B vents, with the m a x i m u m capacity reduced by 20 percent (0.80 x m a x i m u m capacity) and the m i n i m u m capacity as shown in Table 11-6 or 11-7. Corruga ted ~ metallic liner systems installed with bends or offsets i cq~izc addX;oa,1 i cduct; , ,a of tl,c vca~ ,,~o_di~,a,,, ~,,Oadz~. (oeec N,,C~ S.) shall have their m a x i m u m capacity fur ther reduced in accordance with Note 6.

17. TL~ i,~blcs k,c ' , .d~d ] a d , ; ; r,~ ~ 11.3.18 Tables 11-6, 11-7. 11-8. 11-9, and 11-10 shall be used for chimneys and vents not exposed to the outdoors be!ow t h e r o o f line. CI.:;aa:,CTo .., ;c:.to ~AVoscd ;.. d,~ U U L U q U [ O O ~ I U ~ ~ L ~ l q U L L t L I ~ I & ~ y ~ L I ~ L I ~ ~ U L I U L I U q U , I ~ U L l U ~ L L a g - -

Type B vent or l isted ch imney lining system passing t h rough an unused masonry ch imney flue shall no t be considered to be exposed to the outdoors. Table l 1-3 in combinat ion with Tables 11-12 and 11-13 shall be used for clay-tile-lined exterior masonrv chimneys,

(a/ Vent connector is T w e B double-wall, and

(bl At least one annl iance is draft hood-eouinned, and

(c) The combined anDliance canacitv is less than the m a x i m u m can~cRv ~ v e n bv Table | 1-12a (for NAT+NAT/ or Table 11-13a (for ~ + N A T ~ . and

(d~ The caoacitv of each soace-heatin~ aooliance is greater than t h e m i n i m u m caoacitv ~iver~ bv Table 1]'-1~2~ (for NAT+NAT~ or Table 11-13(b) (for F.~,I+NAT'L

NOTE: Local 99 ne rcen t winter design temnera tures nee d to use Table 11-12 and 11-13 are listed in ASHRAE Handbook- Fundamenta ls .

If these condit ions canno t be met_ an alternative ventin~ desiffn shall be used. such as a listed ch imney linin~ system.

Excention: The installation of vents servin~ listed annl iances shall be permi t ted to be in accordance with the appl iance-manufacturer ' s instructions and the te rms of the listing.

11.3.19 Vent connectors shall no t be upsized more than two sizes greater than the listed appliance categorized vent diameter, flue collar diameter , or draft hood outlet diameter. Vent connectors for draft hood-eou inned anoliances shall no t be smaller than the

dcaft hood outlet diameter, l f a v e n t connector size(s) de t e rmined f rom the tables for a fan-assisted aDDliance(s) is smaller than the flue collar diameter, the smaller size(si shall b e n e r m i t t e d to be used rpr .~ded:

881

N F P A 5 4 - - A 9 6 R O P


(a) Vent cotalqlectors for fan-assisted aDo/lance flue collars 12 in. (300 mm) in diameter or smaller are nSt~ reduced bv more than one table size le.m, 19 in. to 10 in. (300 mm to 250 ram) is a one-size reduction] and those lar~er than 12 in. (300 ram) in diameter are not reduced more than t~vo table sizes (eat., 94 in~ to 20 in. (610 mm to 510 mm) is a two-size reduction).

(b) The fan-assisted appliance(s) is common vented with a draft hood-e(~uiooed aDoliance(s).

[19 Uncbanged.]

11.3.21 Where a table permits more than one diameter of pipe to be used for a connector or vent, all the permitted sizes shall be permitted to be used.

~ T ( % T ] [ ? . I • I . , . p i 1 , , i _ 1 1 , 3 t . . . .

21. h',~c, v+it=li~, bcy,,,,d ;l~c ~ablc c,k, ica ahol'l ,,vt b~ [~c,,,,;~.;.cd. l 1.3.22 Internolation shall be oermitted in calculatin~ capacities for vent dimensions that fall between table entries. (See l~xainple 3, Appendix G.)

11.3.23 Extrapolation beyond the table entries shall not be permitted.

[Tables I 1.6 through 11.10: Existing Tables 11.6 through 1 l. 10 Unchanged]

Table 11.11: New


11-12a. Combined Appliance Maximum Input Rating in Thousands of Btu per Hour

Vent Heigh (feet)

6

8

10

15

20

30

50

100


12 19 28 38 50 63 78 113

25 46 71 103 143 188 246 NR

28 53 82 119 163 218 278 408

31 56 90 131 177 236 302 454

N R 67 106 152 212 283 365 546 : : : : : :

N R N R NR NR : : N R 325 419 648

NR NR NR NR, NR NR 496 749

. R . R . R "R . . g22

Table ll.12: New

Table 11-11. Exterior Masonry Chimney, Single NAT Installations with Type B Double-Wall Vent Connectors Minimum allowable input rating of space-heating appliance

in thousands of Btu per hour .

Vent Internal area of chimney, square inches height (feet) 12 19 28 38 50 63 78 113

Internal 99% winter design temperature:

8

10 ®

15

o u- 20 O 3

30

ou- ( o ¢ 0

o

37°F or Greater 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

N R o o o o o o o

123 190 :)49 184 0 0

NR N~ NB :NR NR 393 334 0 i;i il;i iii! ;i i iiiZi iii ̧ i~ilii i~iili i i~ ! ii!!i!ii iiii~ii~iiii i i i .....................

50 NR NR NR NR NR NR NR 579


6 0 0 68 116 156 180 212 266

8 0 0 82 12"7 167 187 214 263

10 0 51 97 141 183 201 225 265

15; NR NR NR NR 233 253 274 305

20 NR NR NR NR NR 307 330 362

30 419 445 485

50 NR NR NR NR NR NR : NR 763.

Internal 99% Winter Design Temperature: . . . . . 17t 0 260F

6 215 259 349

8 ; NR NR NR 197 226 264 352

10 NR ; N R ; : N R N R 214 245 278 358

t5 NR; N R ; N R ; NR; NR 296 331 398 : : : : : : :

20 N R N R NR NR N R 352 387 457

at sot s81

so

Minimum allowable input rating of space-heating appliance in thousands of Btu per hour

Vent height (feet)


12 19 28 38 50 63 78 113


6 NR: NR NR NR NR NR NR 416

8 NR NR NR NR: NR NR 312 423

LL 10 NR NR NR NR NR 289 331 430

~" 15 NR NR NR NR NR NR 393 485 O : : : : : : : : : : : : : : : : : :: : : : : : :

g 20 45o 5.r

30 682

50 972

Internal 99% Winter Des~n Temperature: -10 to 4°F

8 494 : : : : : : : : : : : : : ::: : : : : :

u_ 10 N R 513

_o 15 NR ;NR:; N R NR NR:: NR NR 586 o "7 20 NR NR N R NR 650


so . # N R 00a : : : : : : : : : : :

o Internal 99 Yo Winter Design Temperature: -11 °F or Lower

o _ 1

o.- : : : : : : : : : : : : : : :

882

N F P A 5 4 - - A 9 6 R O P




Vent internal Area of Chimney, Square Inches Vent Height Height (feet) 12 19 28 38 50 63 78 113 (feet)

Internal 99% Winter Design Temperature:

6

8

to

15 (.9

20 LL o r-,. 30

50

100

37°F or Greater

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

NR o o o o

0 0 N R

0 0 0

0 0 0

0 0 0

N R N R NR :NR NR 184 0 0

N R N R N R N R N R N R 334 0

N R N R NR N R NR NR N R 579

NR NR NR NR Internal 99% Winter Design Temperature:

27 to 36°F

6 0 0 68 NR NR 180 212 NR

8 0 0 " 82 NR NR 187 214 263

10 0 51 NR NR :NR 201 225 265 u_

15 253 274 305 09 .~O r-- 20 307 330 302

30 N R NR NR NR ~ N R N R 445 485


100 N R NR N R N R N R Internal 99% Winter Design Temperature:

17 to 26°F

6 N R N R NR NR NR NR NR NR i : ~ i : : i

8 N R NR NR NR NR NR 264 3s2

lo . R 278 358 o1~ : :

15 331 398 04 o r.- 20 N R N R 387 457

30 58t

50 NR NR N R N R NR NR N R 862

100 NR NR NR NR NR NR NR NR


6

8 t.L ~o 10

o 15

20

30

5O

100

o ._J

LL


12 19 28 38 50 63 78 113 Internal 99% Winter Design Temperature:

15 to 16°F

NR NR NR NR NR NR NR NR


NR NR NR NR NR NR NR 430






Local 99% Winter Design Temperature: 4°F or Lower

Not recommended for any vent configurations.

883

N F P A 54 - - A 9 6 R O P


Table 11.]3: New

Table 11-13. Exterior Masonry Chimney, FAN + NAT Installations with Type B Double-Wall Connectors

11-13a. Combined Appliance Maximum Input Ratin~ in Thousands of Btu per Hour


6

8

10

15

20

30

50

1 O0

74 119 178 257 351 458 582 853

80 130 193 279 384 501 636 937

84 138 207 299 409 538 686 1010

N R 152 233 334 467 611 781 1156

NR NR 250 368 508 868 828 1286

NR :NR NR 404 564 747 969 1473

NR N R N R 831 1089 1692

N R N R NR NR NR NR NR 1921


11-13b. Space-Heating Appliance Minimum Input Rating in Thousands of Btu per Hour


internal 99% Winter Design Temperature: 37°F or Greater

6 0 0 0 0 0 0 0 0

8 0 0 0 0 0 0 0 0

10 0 0 0 0 0 0 0 0 ®

12 NR 0 0 0 0 0 0 0 (_9

- 20 N R N R 123 190 249 184 0 0

30 334 393 334 0

5o 714 707 579

100 N R N R NR ;1600 Internal 99% Winter Design Temperature:

27 to 36°F

6 0 0 68 116 156 180 212 266

8 0 0 82 127 167 187'214 263

u_ 10 0 51 97 141 183 201 225 265

o~ 15 N R 111 142 183 233 253 274 305 o

r-- 20 N R N R 187 230 284 307 330 362 o~ . . . . .

30 :NR NR N R 330 319 419 445 485

50 672 705 763

100 1554 Internal 99% Winter Design Temperature:

17 to 26 °F

6 0 55 99 141 182 215 259 349

8 52 74 111 154 197 226 264 352

10 N R ; 90 125 169 214 245 278 358 LL

15 NR NR: 167 212 263 296 331 398 C~ o r-- 20 : 212 258 316 352 387 457

30 362 429 470 507 581

50 N R NR NR N R N R 723 766 862

100 .:NR NR NR::NR NR: NR N R 1669

11-13b. Space-Heating Appliance Mir)imum Input Rating in Thousands of Btu per Hour

Vent Height (feet)

6

8

10 u_

~o 15

°- 20 m

LL

2 c~ "7, 2O

o _J

I L


12 19 28 38 50 63 78 113 Internal 99% Winter Design Temperature:

5 to 16°F

INR: 78 121 166 214 252 301 416

I N R 94 135 182 230 269 312 423

N R 111 149 198 250 289 331 430

193 247 302 346 393 485

NR NR NR 293 360 408 450 547

30 NRi NR: NR 377 450 531 580 682

50 NR NR N R N R N R 797 853 972

100 N R :NR NR NR NR NR NR 1833 Internal 99% Winter Design Temperature:

-10 to 4°F

6 NR NR 145 196 249 296 349 484

8 NR NR 159 213 269 320 371 494

10 NR NR! 175 231 292 339 397 513

N R NR NR 283 351 404 457 586

N R N R N R 333 408 468 528 650

3o 603 667 8o5

so 955 1003

100 NR NR NR NR NR NR NR :NR

Local 99% Winter Design Temperature: -11 °F or Lower

884

N F P A 5 4 - - A 9 6 R O P


Appendix A Explanatory Material

This Appendix is not a part of the requirements of this Code but is included for informational purposes only.

[A.2.4.1 Unchanged.]

A.2.4.3 Gas Piping Size. The gas-carrying capacities for different sizes and lengths of iron pipe, or equivalent rigid pipe, and semirigid tubing are shown in the capacity tables in Part 10.

Tables 10-1 through 10-12 indicate approximate capacities for single runs of piping, ff the specific gravity of the gas is other than 0.60, correction factors .,ffra]t-should be applied. Correction factors for use with these tables are given in Table 10-13.

For any gas piping system, for special gas utilization equipment, or for conditions other than those covered by the capacity tables in Part 10, such as longer runs, greater gas demands, or greater pressure drops, the size of each gas piping system ~'rnt¢ should be determined by standard engineering methods acceptable to the authority having jurisdiction.

A suggested procedure with an example of using tables to size a gas piping system is presented in Appendix C.

A.2.5.1(a) For welding specifications and procedures that may can be used, see the Standard for Welding Pipelines and Related Facilities, API Std. 1104; Standard for Welding Procedure and Performance Qualification, AWS B2.1; or Boiler and Pressure Vessel Code, Section IX, ANSI/ASME.

A.2.6.2(d) :Fh~ An average of 0.3 ~rain~ 0fhvdrouen sulfide her 100 standard cuft (0.7 mu net 100 L) ~ equivalem to~t trace as determined byMethod" of Test for Hydrogen Sulfide and Mercaptan Sulfur in Natural Gas (Cadmium Suffate--lodometric Titration Method), ANSI/ASTM D2385; or Method of Test for Hydrogen Sulfide in Liquefied Petroleum (LP) Gases (Lead Acetate Method), ANSI/ASTM D2420.

. . . . . . . . . . . . . . . . S e e A . 2 6 2 ( d )

Copper and brass tubing and fittings (except tin-lined copper tubing) st'mt~hould not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard ~ cuft of gas ( 0 . 7 ~ , m _ _ g p e r 100 4itt-t-s~. LL

[A.2.6.8(a) Unchanged.]

A.3.1.3 For information on corrosion nrotection of underground nine. see Control of External Corrosio~a on Under , round or ~ublllerged Metallic Pinin~ Systems. NACE RP 016"9. Information on installation, mainte[aance. and corrosion orotection may be available from the was sunolier.


[A.4.2,2 Unchanged.]

[A.4.3 Unchanged.]

A.5.3 Special Conditions Created by Mechanical Exhausting or F'Lreplaces. Operation of exhanst fans, ventilation systems, clothes dryers, or fireplaces may~__gl create conditions requiring special attention to avoid unsatis~tctory operation of installed gas utilization equipment.

#,-5.3,2 In unconfined snaces in buildings of other than unusually t ig~ construction (see Section 1.7. Defi[fidonsL infiltration can be adequate to provide air for combustion, ventilation, and dilution of

A.6.3.5 For details of requirements on low pressure heating boiler safety devices, refer to Boiler and Pressure Vessel Code, ~986 Eddz;,,,, L,,;; Section IV. "I~.~_. Pressure Heating B..;:c;~, Sect,,,, IV, ~ A N S I / A S M E .

A.6.12.8 Where exhaust fans are used for ventilation, orecautions may be necessary to avoid interference with the oDera(ion of the eouioment.

[A-6.24.1 Unchanged.]

[A.6.$0.9 Unchanged.]

A.7.2.3 Information on the construction and installation of ventilating hoods may-can be obtained from Standard for the Installation of Equipment for the Removal of Smoke and Grease- Laden Vapors from Commercial Cooking Equipment, ANSI/NFPA 96.

[A,7.3.5 Unchanged.]

A.7.6.3(a) Additional information on sizing venting systems can be found in:

[(a) through (e) Unchanged.]

(f) Reference may can also be made to the chapter on chimney, gas vent, and fireplace systems of the ASHRAE Handbook--HVAC Systems and Equipment.

~qu!~r~" ? ' =°:':~°?::': ~"'~"~7" ~:~::: :" ":':°:~:: ~'~" ~:~ I ~ I I ~ O I O L L ~ L ~ I I t O U O L I ~ £ 1 0 ) ' O t ~ l l a a [ ~ l J ~ L a ~ o .

. . . . . . - ~ 1 A _ _ 1 , , , t • r • • . _ J - . J . ,

~ I l I O I L J 6 U U I l O P l & ~ l - - ~ l O t ~ U U ~ I I J U U O U U I a O ~ O L ~ J I I ~ l ~ m ~ L t l ~ P g - -

¢ ~ ; p w d ,~VvI',~,~,.~, 0l,,,l': bc ~;zcd ,,, acco, da,,cc ~,;d~ Pa, t 11 6,

A.7.7.4(a) Reference may can also be made to the chapter on chimney, gas vent, and fireplace systems of the ASHRAE Hand- book--HVAC Systems and Equipment.

[A.7.8 Unchanged.]

[Figure A.7.8 Unchanged.]

A.7.10.3 Reference may can also be made to the chapter on chimney, gas vent, and fireplace systems of the ASHRAE Hand- book--HVAC Systems and Equipment.

A.7.10.5 Reference may can also be made to the chapter on chimney, gas vent, and fireplace systems of the ASHRAE Hand- book--HVAC Systems andEquipment.

A.7,10.10(b) See A.7.6.3(a).


[Figure A.7.12.4 Unchanged.]

A.8.1.1 Checking Burner Input.

[ (a) Unchanged.]

(b) Checking Burner Input Not Using a Meter. The fixed orifice size for each burner may can be determined in accordance with Table F-1 for utility gases and Table F-2 for undiluted liquefied petroleum gases.

A.8.2 Normally, the primary air adjustment should first be set to give a soft blue flame having luminous tips and then increased to a point where the yellow tips just disappear, ff the burner cannot be adjusted as above, eomm~ the manufacturer or serving gas supplier shQuld be contacted.

885

N F P A 5 4 ~ A 9 6 R O P


A.8.6 A procedure for checking draft can be found in ADnendix H. steps 7. 8. and 10-14. " "

Appendix B C o o r d i n a t i o n of Gas Utilization Equipment Design, Construction, and Maintenance

This Appendix is ;.~o, ,~ad;c . . . d ~ not a part of the C,~Jc. Tk~s

cqu;t. , .c;, t , requirements of this Code but is included for informational nurnoses only.

B.1 Coordination.

[B.I.1 dwough B.1.4 Unchanged.]

B.1.5 The person or agency ~ n s t a l l i n g the ~as eouinment and the person or agency authorizing the installation of'gas equipment (purchaser) j~h'er~., jointly should:

[(a) through (d) Uncbanged.]

B.2 Gas Equipment Design and Construction Checklist.

lB.2.1 through B.2.3 Unchanged.]

B,2.4 Pipe, fittings, and valves ~ should conform to applicable American National Standards as indicated in Section 2.6. Piping, bushings, and material in fittings should not be selected nor used until the following factors have been considered:

[(a) through (0 Unchanged.]

[B.2.5 and B.2.6 Unchanged.]

B.2.7 In enclosed chambers, tire accumulation of gas-air or solvent- air mixtures that may can be accidentally ignited constitutes a potential hazard to life and property. For this reason, consideration should be given to the selection and installation of suitable protective equipment. The selection of a satisfactory protective system and components not otherwise covered by existing codes or standards should be based on the requirements of each individual installation after consultation with the various interested parties, including user, designer, insurance company, and local authorities having jurisdiction. Some of the factors and considerations involved in the selection of protective equipment are:


lB.3 Maintenance of Gas Equipment. Unchanged.]

Appendix C Sizing and Capacities of Gas Piping

This Appendix is kX,,i ; .advc a,,d ~o not a part of the cemd~. requirements of dais Code but is included for informational purposes only.

J I . . . . de, t~ ~czc,,~fi;.c In determining the size of piping to be used in designing a gas piping system, the following factors must be considered:

[(a) through (e) Unchanged.]

For any gas piping system, for special gas utilization equipment, or for conditions other than those covered by Tables 10-1 through 10-4, or Table 10-15, 10-16, or 10-17 such as longer runs, greater gas demands, or greater pressure drops, file size of each gas piping system should be de te rmined by standard engineering practices acceptable to file authority having jurisdiction.

Description of Tables

(a) The quantity of gas to be provided at each outlet should be determined, whenever possible, directly from the manufacturer 's Btu input rating of the equipment ~ that will be installed. In case the ratings of the equipment to be installed are not known, Table (3-1 shows the approximate consumption of average appliances of certain types in Btu per hour.

To obtain the cu[,;~ .%~t w ' l - ,~, cu f t oer hr of gas required, divide the total Btu input of all equipmetat by the average Btu heating value per ~--trbi~-fr~t cu f t of the gas. The average Btu per

cu ft of the gas in the area of the installation rrmy-can be obtained from the serving gas supplier.

[(b) through (d) Unchanged.]

[(e) Unchanged.]

[ l through 3 Unchanged.]

4o In the appropriate cap acity table, select .the column showing the. measured length, or the next longer length if the table does not give the exact length. This is the only length used in determining the size of any section of gas piping. If the gravity factor is to be applied, tile values in the selected column of the table are multiplied by the appropriate multiplier from Table 10-13.

Capacities of smooth wall pipe or tubing may can also be determined by using the following formulae*:

High Pressure [1.5 psig (10.3 kPa) and above]:

Remainder of Appendix C Unchanged (Including Tables C-l, C-2 and All Equations).

Appendix D Suggested Method for Checking for Leakage

This Appendix is hX~; .~.~z;vc .~.d ;z not a part of the requirements of t[ais Code ~I~.d~ .kvt, c,.dL, k.....Z ~ V,~z ,.f d',¢ ,'.~ ~ ' , , " , v ,~uz . .X dfio C,.d¢, but is included for information purposes orl']y.

Use of Lights. Artificial illumination used in connect ion with a search for gas leakage ~ should be restricted to battery-operated flashlights (preferably of the safety type) or approved safety lamps. In searching for leaks, electric switches should not be operated, ff electric lights are already turned on, they should not be turned off.

(a) Testing for Leakage Using file Gas Meter. lumaediately prior to the test, it should be de te rmined that the meter is in operating condition and has not been bypassed.

Checking for leakage can be done by carefully watching the test dial of the meter to de termine whether gas is passing through the meter. To assist in observing any movement of the test hand, wet a small piece of paper and paste its edge directly over the centerline of the hand as soon as the gas is turned on. This observation should be made with the test hand on the upstroke. The following table can be used for determining the length of observation time.

[Table D-I Unchanged.]

In case careful observation of tile test hand for a sufficient length of time reveals no movement, the piping mhaer should be purged and a small gas burner turned on and lighted, and the hand of the test dial again observed. If the dial hand moves (as it should), it will show that the meter is operating properly, ff the test hand does not move or register flow of gas through fire meter to fire small burner, the meter is defective and the gas should be shut o f f and the serving gas supplier notified.

(b) Testing for Leakage Not Using a Meter. This can be done as oudined below:

1. For any gas system:

By attaching to an appropriate checkpoint a manometer or equivalent device ,~':L,-.;.~,I o., d,a~ K ~ , bc ;cad ;.~ i.-.c, c; . . . . . ~, - f • .vZ ,,~6;~ d , ~ 2 w ' cc..C v." . vc ,~d . .g ~)oC~,'," ~., coot,'- between the inlet to the piping system and the first regulator in the piping system, and momentari ly turning on the gas supply and observing the gaging device for pressure drop with the gas supply shut off. No discernible drop in pressure should occur during a period of 3

min. or,

2. For gas systems using undiluted liquefied petroleum gas:

System preparation for propane:

A leak check performed on axl LP-Gas system being placed back in service should include all regulators, including appliance regulators, and control valves in the system. Accordingly, each individual equipment shutoff valve should be supplying pressure to its

886

N F P A 5 4 - - A 9 6 R O P


appliance for the leak check. This check will prove the integrity of the 100 percen t pilot shutof f of each gas valve so equipped, so the manua l gas cock of each gas valve incorpora t ing a 100 percen t pilot shutoff should be in the "on"posi t ion . Pilots no t incorporat ing a 100 percent pilot shutoff valw; a n d a l l manua l gas valves no t incorporating safety shutoff systems are to be placed in the "off" position prior to leak checking as out l ined b e l o ~

Appendix G Sizing o f Venting Systems Serving Appliances Equipped with Draft Hoods , Category I Appliances, and Appliances

Listed for Use with Type B Vents

This Appendix is ; , . % , . ~ d v c ~ . d ~ not a part of the reuu i rements of this Code but is included for informational nurooses only.

[(i) Unchanged . ]

(ii) For systems serving appliances that receive gas at pressures of 1 /2 psig (3.5 kPa ~ g~m_u_g.~, or less, by insert ing a water m a n o m - eter or equivalent device .~.1;b,..tcd o.. d.=t it ~ . b c , cad ; . ;.,.,,~ ...... ;., ~.~,,~;. ...... ;A . . . . 1 ;.d, (25 v=) ,.=;.~. wl ..... ;nto the system downs t ream of the final system regulator, pressurizing the system with ei ther fuel g~s or air to a test pressure of 9 in. + 1 /2 in. (2.2 kPa + 0.1 kPa) water column, and observing the device for a pressure change, f f fue l gas is used as a pressure source, it is necessary to pressurize the system to fu l lopera t ing pressure, close the conta iner service valve, and then release e n o u g h gas f rom the system th rough a range bu rne r valve or o ther suitable means to drop the system pressure to 9 in. + 1 / 9 in. (2.2 kPa + 0.1 kPa) water column. This ensures tha t all regulators in the system are un locked and tha t a leak anywhere in the system is communica t ed to the gauging device. The gauging_device should indicate no loss or gain of pressure for a per iod of 3 rain.

(c) W h e n Leakage is Indicated. If the me te r test hand moves, or a pressure drop on the ~ ~ is noted, all equ i pmen t or outlets supplied t h rough the system ~ should be examined to see if they are shu t off a n d do not leak. If they are f o u n d tight, there is a leak in the piping system.

[Figures G-I t h rough G-IO Unchanged . ]

- '4

Manifold Common. 1 ~ LM Vent Connector ~ , ~ ~ - - ' ~

I

Appendix E Suggesmd Emergency Procedure for Gas Leaks Unchanged .

Appendix F Flow o f Gas through Fixed Orif ices

This Appendix is ; . ~ , ,.;aGvc ~ , d ;~ not a part of the reuu i rements of this Code but is included for informational ourDoses only.

[Tables F-1 th rough F-4 Unchanged . ]

Use of Orifice Tables

[/k Unchanged . ]

B. To Select Correct Oritice Size for Rated Burner Input:

The selection of a fixed orifice size for any rated bu rne r inpu t is affected by manyvariables , inc luding orifice coefficient, a n d i t is r e c o m m e n d e d that the appl iance manufac tu re r be consul ted for that purpose. W h e n correct orifice size canno t be readily determined, the orifice flow rates, as stated in the tables in this appendix, may can be used to select a fixed orifice size with a flow rate to approximately equal the required rated burner input.

For gases of the specific gravity and pressure condit ions stipulated at elevations u n d e r 2,000 ~ ft (600 m), Table F-1 (in ~.L:~ f ~ : w " tmmm~ c u f t per hr) or Tahle F-2 (in Btu per I . . . . ) ,,My hr_r]___c~ be used directly.

Where the specific gravity of the gas is o ther than 0.60, select the multiplier f rom Table F-3 for the utility gas served and divide the rated burner inpu t by the selected factor to de te rmine equivalent input at a specific gravity of 0.60; then select orifice size as directed above.

Where the appliance is located at an alti tude of 2,000 ft (600 m) or above, first use the manufac tu re r ' s rated inpu t at sea level to select orifice size as directed above, and then use Table F-4 to select the equivalent orifice size for use at the b igher altitude.

1 ~I Connectors

l- t D

Example: Manifolded Ctmln~n Vent Connector L M shall be no greater than 18 tlnr,~s the common vent cormecte¢ mardfok:l Inside diameter; I.e., i t 4dn. (100-rnm) Ir'~lde diameter c o ~ vent connector manifold shall riot exce~d 72 in. (1 ~00 rnm) fo leng ~t. (SoO Note 4.) Note: This is an illustration of a lypical manifolded vent con flector. Diflerem appliance, vent connector, or common vent types ate po,aalble. Consult the notes for common venting.

Figure G-I1

[Figures G-12 th rough G-14 Unchanged . ]

Examples Using Single Appliance Vent ing Tables

[Example 1: Unchanged . ]


[Figures G-15 a n d G-t6 Unchanged . ]


Examples Using C o m m o n Vent ing Tables


[Figure G-17 Unchanged . ]

[Example 5a: Unchanged . ]

[Figure G-18 Unchanged]

[Example 5b: Unchanged . ]

Examnle 5c: C o m m o n Vent ing Into an Exterior Masonry Chimney

In this case. the water heater and fan-assisted furnace of Examples 5a and 5b are to be c o m m o n vented into an exterior masonry chimney. The ch imney height , clay tile l iner dimensions, and vent connector heiuhts and laterals are the same as in Examole 5b. This

v

887

N F P A 54 - - A 9 6 R O P


system is bein~ instal led in Charlotte. North Carolina. Does this exter ior masohrv chimney need to be rel ined? If so. what corrugated metall ic l iner size is r ecommended? What vent connector ~]iameters are recommended?

,Solution

Accordin~ to Note 17. Tv~e B vent connectors are reouired to be used with exter ior m a s o n ~ chimneys. Table 11-13 to s|ze FAN+NAT common ventin~ installations involuting Tvoe-B double wall connectors into~exterior masonry chimneys.

The local 99-oercent winter design t emnera tu re needed to use Table 11-13 can be found in ASHRAE Handbook-Fundamentals . For Charlotte. North Carolina, dais design tempera ture is 19°F.

Chimney Rel iner Reouirement . As in Examole 5b. use the 63 so in. Internal Area c o l u m n s f o r this size clay file lirier. Read down the '63 so in. co lumn of Table l l - 13a to the 30-ft he ight row to f ind that the Combined Aooliance Maximum Inou t is 747.'000 Btu oer hr. The combined inbh t ra t ing of the apolia.nces in dais installation. 135.000 Btu oer hr. is'less tharT the max~rhum value, so this cri terion is satist~ed. Tab|¢ l l -13b, at a 19°F Design Temoera ture . and at the same Veo~ ~ e i ~ h t and Internal Area used abo¢ce, shows that the min imum alloxcable inou t ra t ing o f a soace-heafin~ aDoliance is 470,000 l~tu her hr. Tile furnac'e inpu t rafin~ of 1~)0.~)00 Btu per hr is less than tfiis m i n i m u m value. So'this cr i ter ion is no t satisfibd, and an alternative venfin~ d e s i ~ needs to be used. such as a Tvoc B vent shown in Example 5a. or al ' is ted chimney l iner system shown in the remainder of d ie examole.

A¢¢ordin~ to Note 16. Tables 11-6 or 11-7 are used for sizinv ¢ o r r ~ a t e d ' m e t a l l i c l iners in masonrv chimneys, with the max i mum comrrTon vent caoacities r educed by 20 oercerit. This example will be con t inued asshmina Tvoe B vent corinectors.

Water Heater Vent Connector Diameter. Usin¢ Table 11-6. Vent Connector Caoacitv. read down the Total Vent Fleieht (H) co lumn to 30 ft. and r~ad across the 2-ft Connector Rise (R~V row to the first Btu per hour ra t ing in the NAT Max column tha i is eoual to or greater than the w~ter beater inou t rating. The table ~hows that a 3- In. vent connector has a maximt im canac~tv of 39.000 Btu per hr. So the 35.000 Btu ne t hr water heater in "this example can us~ a 3-in. connector.

Furnace Vent Connector Diameter. Usin~ Table 11-6. Vent Connector Canacitv. read down the Total Vent Height (Hi co lumn to 30 ft. and r~ad a~zross the 3-ft Connector Rise (RJ'row tO the first Btu her hr ra t ing in the FAN Max column that is eoua l to or ~,reater thar~ the furnace inout rating. The table shows tha t a 4-in. v~nt connector has a rnakimum c~Dacitv of 123.000 Btu her hr. and a m i n i mum inout ratin~ (FAN Min~canaci tv of 123.600 Btu oer hr. and a m i n i m h m indue ' ra t ing (FAN Min~ of 34.000 Btu oerlar . The 100.000 Btu oer br ' furnace Tn this exarnole falls within [his range, so a 4-in. connector is adequate.

Chimney Liner Diameter. The total innut to the common vent is 135.000 Btu per hr. Using the CommoffVent Canacitv Port ion of Table 11-7. r~ad down th~ Total Vent Height (H~" colt imn to 30 ft and across dais row to f ind the smallest ve~t d iameter in the FAN+NAT column that has a Btu oer hr rat ing greater than 135.000 Btu oer hr. The 4-in. common re 'at has a capacity of 138.000 Btu oer hr. Reducin~ the m a x i m u m caoadtv for a 4qn. corrugated l iner 6f 110.000 Btu t)er hr. less than the tot~al inout of 135.000 Btu oer hr. SO a larger l iher is needed. The 5-in. cohamon vent caoacit4 listed in Teb[e 1'1-6 is 210.000 Btu oer hr. Therefore. a 5-in. coh'u~'ated metal l iner should be used in this example.

SinEle Wall Connectors. Once it has been established tha t rel inin~ the c]fimnev is necessary, TvDe B double wall vent connectors are not sDe¢ifichllv reouired. Tfiis example could be redone usin~ Table 11-7 ~'or sin~le" wall" vent connectors. "For dais case. the vent connector and l iner diameters would be the same as found above with TvDe B double wall connectors.

5 F "10F

27 F -10F

5F

17F

27 F

,37F

9 9 % Winter Des ign Temperatures for the Uni ted States. T

This map is a necessarily generalized guide to temperatures in the United States. Temperatures shown for areas such as mountainous regions and large urban centers may not be accurate. The data used to develop this map are from the 1993 ASHRAE Fundamentals Handbook (Chapter 24, Table 1: Climatic conditions for the United States).

Figure G-19. DOE heat ing regions I through V were used to de te rmine the outdoor temperatures for analyzing exter ior masonry chimneys.

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N F P A 54 - - A 9 6 R O P


[Table G-1 Unchanged]

Appendix H Recommended Procedure for Safety Inspection of an Existing Appliance Installation

This Appendix is "~,S,;i.,adv.. o~d :~ not a part o f the reuuirements of this Code but is included for informational pui-poses ooly.

The following procedure is in tended as a guide to aid in determining that an appliance is properly installed and is in a safe condition for continuing use.

This procedure is predicated on central furnace and boiler installations, and it should be recognized that generalized procedures cannot anticipate all situations. Accordingly, in some cases, deviation from this procedure m.ny4~ is necessary to de termine safe operat ion of the equipment .


A p p e n d i x I Recommended Procedure for Installing Electrically perated Automatic Vent Damper Devices ~,a in Existing

This Appendix is ~...%, ;~ad,c ~ , d ~z not a part o f the reouirements of this Code but is included for informational ourooses only.

This procedure is in tended as a guide to aid in safely installing an electrically operated automatic vent damper device ~rill._thg__2.¢.~ l.e.IMllg an existing applkmce.

This procedure is based on the assumption that the history of the specific appliance has been one of safe and satisfactory operation.

This procedure is predicated on central furnace, boiler, and water heater installations, and it should be recognized that generalized procedures cannot anticipate all situations. Accordingly, in some cases, deviation from this procedure m ~ - b e is necessary to determine safe operation of tee equipment.

The following steps should be followed in making the modifications:

[1 through 17 Unch~mged.]

Append ixJ Recommended Procedure for Installing Mechanically ._ ,.Actuate d A, utomaficV~t Darner V e.~c~ ~ _ Exls~g

This Appendix is ;,,,~ . . . . . ,.z;;~ ~ , d k~ not a part of the reouirements of this Code but is included for informational Duh3oses only.

This procedure is in tended as a guide to aid in safely installing a mechanically actuated automatic vent damper device m~-in the vent

an existing appliance.


This procedure is predicated on central furnace, boiler, and water heater installations, and it should be recognized that generalized procedures cannot anticipate all situations. Accordingly, in some cases, deviation f rom this procedure m a y 4 ~ is necessary to determine safe operation of the equipment.



Appendix K Recommended Procedure for InstallingThermally Actuated Automatic Vent Damper Devices ~ in l~,istlng

vents

This Appendix is kZ.~z~,.fivc ~.~d 1~ not a part of the reouirements of this Code but is included for informational ourooses only.

This procedure is in tended as a guide to aid in safely installing a thermally actuated automatic vent damper device ~er in the vent

an existing appliance.


This procedure is predicated on central furnace, boiler, and water heater installations, and it should be recognized that generalized procedures cannot anticipate all situations. Accordingly, in some cases, deviation from this procedure m'nyaoe is necessary to determine safe operation of the equipment .



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report of the committee on mr. bukowski voted affirmative ... · mr. bukowski voted affirmative...

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