asc z223 nfpa 54 · fasel) to seek nominees for asc z223 chair and as a recommendation to the nfpa...

ASC Z223 NFPA 54 COMMITTEE ON NATIONAL FUEL GAS CODE

DRAFT COMMITTEE MINUTES

June 21-22, 2016

APPROVAL PENDING


Draft 07/12/16

Minutes ASC Z223 / NFPA 54

National Fuel Gas Code Committee

Embassy Suites Biltmore Phoenix

Phoenix, AZ

June 21-22, 2016

1. Call to Order, Self-Introductions & Attendance: Chair, Tom Crane, called the meeting to order and members and guests introduced themselves. (Attachment A).

2. Adoption of Agenda: The agenda was approved as distributed.

3. Announcements: Participants were made aware of the fire alarms/exists and the AGA and NFPA antitrust guidelines. An overview of NFPA voting options and process was provided.

4. Membership Review: a. ASC Z223 Committee Updates – The membership roster and interest category balance was

reviewed. The committee is in balance in accordance with its operating procedures.

b. NFPA 54 Committee Updates – The membership roster was reviewed. The NFPA Standards Council is responsible for maintaining committee balance and was noted that it is in balance.

c. Expiring Chair Term and Replacement – Mr. Crane’s term as the Chair of ASC Z223 and NFPA 54 will end with the publication of the 2018 National Fuel Gas Code (NFGC). The ASC Z223

procedures require an election of their Chair. The NFPA Standard Council appoints Chairs to their

committees. As has been customary, ASC Z223 formed a nominating committee (Papageorge,

Fasel) to seek nominees for ASC Z223 Chair and as a recommendation to the NFPA Standards

Council for their appointment. The Secretary is requested to email the memberships of both

committees seeking interested persons to contact the nominating committee by September 30th.

5. Approval of Committee Meeting Minutes: The October 2015 full committee were approved as distributed.

6. Future Meeting Schedule: The proposed 2017 meeting schedule was reviewed without changes (Attachment B).

7. Consideration of Public Comment: The committee reviewed and took action on the public comments. The committee actions will be the standing action (Summary - Attachment C) on the letter ballot

scheduled to be conducted in mid-August, 2016. Approved actions will form the Second Revision Draft.

Changes from the First Draft will be utilized by the ASC Z223 as their second public review document.

The Second Revision Draft will be used by the NFPA 54 membership as part of the NITMAM process.

8. Other Actions:

a. ASC Z223 - Formal Interpretation Request (Attachment D) – Section 9.6.5.1 (A). Committee Response for Letter Ballot: “Section 9.6.5.1 intends to require a union or flanged joint only where

appliances are connected with rigid piping. Although not expressly stated, it is understood that a

union would be redundant and unnecessary where appliances are connected with semi-rigid tubing

and listed appliance connectors. Appliance connectors utilize a flare-type mechanical joint that

allows the appliance controls to be serviced or replaced without disturbing the gas piping upstream


Draft 07/12/16

of the shutoff valve outlet.” The Secretary was requested to add the issue to the Piping Advisory

Panel agenda for consideration.

b. ASC Z223 - Formal Interpretation Request (See Attachment E) – Section 9.6.5 Appliance Shutoff Valves and Connections. A formal interpretation is not needed since the code is clear. The

committee authorized the Secretary to send the following response: “The code would require

the installation of a shutoff valve only where an appliance is connected to the piping. Until such

time that the appliance is installed, the piping could be capped without a valve present. If a valve

is installed prior to the installation of an appliance, or when the appliance is removed, such valve

would have to be capped or plugged.” The Secretary was requested to add the issue to the

Appliance Advisory Panel agenda for consideration.

9. New Business:

a. Appointment of NFPA 54/ASC Z223 Representative to NFPA 72. Mr. Lemoff was advised by the Staff Liaison to NFPA 72 that the Initiating Devices Technical Committee of the NFPA

Signaling Systems Project is proposing to expand the section on gas detectors in the 2019 edition

of NFPA 72, National Fire Alarm and Signaling Code. A task force has been formed to develop

proposals for this subject, which could include the location of gas detectors. Interested persons

should contact Ted Lemoff of their interest to serve as the NFPA 54 liaison.

b. Industrial Appliance Installation Requirements. Mr. Lemoff expressed his belief that the requirement for the installation of industrial appliances in the Code is less than specific. He noted

areas where the National Fuel Gas Code could be more specific in regard to industrial appliances.

An example is Section 9.6.4, Connection of Portable and Mobile Industrial Appliances. Unsure

of what type of appliances are being referenced and is the section still needed. Another example

is Section 9.2.2 and Chapter 10 requirements on clearances to combustible for larger industrial

appliances. The requirements apply to all gas appliances but should the clearances be different

(larger) for industrial-type appliances to allow for maintenance and inspection. The Secretary

was requested to add the issue to the Appliance Advisory Panel agenda for consideration and

possible revisions to the 2021 Edition.

c. Possible Committee Project on the use of “listed and labeled.” Other model installation codes use “listed and labeled” in describing the requirements for specific certified appliances and

equipment. The Committee several editions ago deleted “labeled” from the National Fuel Gas

Code since the terms of the listing include the required labeling. The Secretary was requested

to add a review of the NFGC practice on the three advisory panel agendas for possible revision

to the 2021 Edition.

10. Odorization Basics Presentation: Mr. John Roberts, Rimkus Consulting Group, was invited by the Chair and he provided a 15-minute refresher presentation on basic gas odorization topics. Topics included

odorization methods, types of odorants, natural gas and propane specific issues, possible causes of

odorant fade, and its recognition by persons (Attachment F).

11. Adjourn: With business completed, the committee adjourned on June 22th at 11:34 a.m.

7/12/16

ATTACHMENT A - Attendance List1

National Fuel Gas Code Committee

Embassy Suites Biltmore Phoenix Phoenix, AZ

June 21-22, 2016

Members2 Name, Representing

Thomas Crane - Chair, Crane Engineering Paul Cabot - Secretary, American Gas Association Stephen Abernathy, American Gas Association Dmitry Antonov, Intertek Testing Services David Berning, Intertek Testing Services Jonathan Brania, Underwriters Laboratories Shannon Corcoran, CSA Group Kody Daniel, Property Casualty Insurers Association Gerald Davis, American Gas Association Glen Edgar, VenTech Consulting Mark Fasel, Viega LLC Pennie Feehan, Copper Development Association

Mike Gorham, National Propane Gas Assoc. Gregg Gress, International Code Council Theodore Lemoff, Consultant Andrea Papageorge, American Gas Association Phillip Ribbs, CA State Pipe Trades Council April Richardson, Railroad Commission of Texas Don Surrena, NAHB Peter Swim, Whirlpool Corporation Thomas Stroud, HPBA Franklin Switzer, S-afe Inc. Eric Smith, International Fire Marshals Association Jason Stanek, American Gas Association

NFPA Staff - Laura Montville

Guests Name, Organization

Gaetano Altomare, IPEX, Inc. Curtis Dady, Viega, LLC Richard Gilbert, Texas Propane Gas Assoc. Larry Gill, IPEX USA LLC Mark Harris, Titeflex Corporation James Molloy, Centrotherm John Roberts, Rimkus Consulting Group

Dan Snyder, American Water Heater Company James Ranfone, American Gas Association Frank Stanonik, AHRI Robert Torbin, Omega Flex James Wallace, A.O. Smith Corporation Art Weirauch, Omega Flex

1 Attended all or part of the committee meeting, sign in sheet can be obtained from the Secretary. 2 Voting and alternate members of NFPA 54 and ASC Z223

ATTACHMENT B – FUTURE MEETING SCHEDULE

DATE: June 3, 2016

SUBJECT: 2017 Meetings: ASC Z223/NFPA 54 Committee

The ASC Z223 and NFPA 54 committees meet jointly to maintain and develop the National Fuel Gas Code. For your planning purposes the National Fuel Gas Code Committee’s 2017 preliminary meeting schedule is proposed as follows:

2018 EDITION: PUBLISHED OCTOBER 2017

2017 MEETING:

Date: ...................November 14-15, 2017 (Tuesday-Wednesday) Meeting Type: ....Full Committee Purpose:..............Complete Unfinished Business &Planning on 2021 Edition Location .............To Be Determined Host: ...................American Gas Association

Timely meeting notices will be sent to you as each meeting date approaches. Meeting information will also be available on the AGA and NFPA websites. Please contact Paul Cabot with any questions or comments you may have at 202.824.7312 or [email protected].

ATTACHMENT C SUMMARY LIST OF COMMITTEE ACTIONS ON PUBLIC COMMENT

(PENDING LETTER BALLOT APPROVAL) 7/23/16

1 PC = Public Comment; SR = Second Draft Revision 2 Action as determine at meeting. Final action is subject to committee letter ballot.

Comment1 Section Action2 Notes

Chapter 2:

SR 32 2.3.2 Accept Staff to review the standards list and update dates as appropriate.

SR 3 2.4 Accept Staff to review the standards list and update dates as appropriate.

Chapter 3:

SR 1, 2, 27 3.3.11.3, 3.3.30.2, 3.3.34

Accept Update these extracted NFPA definitions to their latest edition text.

PC 31 3.3.78.3, 3.3.78.4

Reject

PC 32 3.3.78.3, 3.3.78.4

Reject

PC 42 3.3.84.4 Reject but See SR 19

SR 19 3.3.84.4 Approved Revise definition as follows: A pressure regulator that is installed in series with another pressure regulator for the purpose of preventing an overpressure in the downstream piping system.

Chapter 5:

PC 68 5.4.4 Reject

PC 34 5.5.1 Reject But See SR 4

SR 4 5.5.1 Accept 5.5.1 Gas Piping System Operating Pressure Limitations. The maximum design operating pressure for any piping system shall not exceed 125 psi (862 kPa).

PC 33 5.5.4 Reject But See SR 5





SR 5 5.5.4 Accept 5.5.4 Maximum Design Maximum Operating Pressure in Buildings. The maximum design operating pressure for any piping systems located inside buildings shall not exceed 5 psi (34 kPa) unless one or more of the following conditions are met:

(11) The piping system is an LP-Gas piping system with a design an operating pressure greater than 20 psi (138 kPa) and complies with NFPA 58.

PC 41/SR 6 5.5.5 Accept


SR 30 5.6.2.2 Accept 5.6.2.2 Steel, Stainless Steel, and Wrought Iron. Steel, stainless steel, and wrought-iron pipe shall be at least Schedule 40 and shall comply with one of the following dimensional standards: of (1) ANSI/ASME B36.10M, Welded and Seamless Wrought Steel Pipe and one of the following; (21) ASTM A53, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless (32) ASTM A106, Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service (43) ASTM A312 Standard Specification for Seamless, Welded, and Heavily Cold Worked Austentic Stainless Steel Pipes

SR 20 5.6.2.2 [Detail] Accept In Section 5.6.2.2, change "Schedule 40" to "Schedule 10" 5.6.2.2 Steel, Stainless Steel, and Wrought Iron. Steel, stainless steel, and wrought-iron pipe shall be at least Schedule 40 10 and shall comply with the dimensional standards of ANSI/ASME B36.10M, Welded and Seamless Wrought Steel Pipe and one of the following; (1) ASTM A53, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless





(2) ASTM A106, Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service (3) ASTM A312 Standard Specification for Seamless, Welded, and Heavily Cold Worked Austentic Stainless Steel Pipes

SR 21 5.6.7.1 Accept 5.6.87.1* Pipe Joints. Pipe Schedule 40 and heavier pipe joints shall be threaded, flanged, brazed, welded, or assembled with press-connect fittings listed to ANSI LC 4, Press-Connect Metallic Fitting for Use in Fuel Gas Distribution Systems. (A) Pipe lighter than Schedule 40 shall be connected using press-connect fittings, flanges, brazing, or welding.

(B) Where nonferrous pipe is brazed, the brazing materials shall have a melting point in excess of 1,000°F (538°C). (C) Brazing alloys shall not contain more than 0.05 percent phosphorus.

SR 29 5.6.4.1.2 Accept 5.6.4.1.2 Plastic Polyamide pipe, tubing and fittings, other than polyethylene, shall be identified in and conform to the 2008 edition of ASTM D2513 F2945, Standard Specification for Thermoplastic Polyamide 11 Gas Pressure Pipe Tubing and Fittings. Pipe to be used shall be marked “gas” and “ASTM D2513 F2945”.

PC 35 5.8.1, 5.8.2 Reject but See SR 7

SR 7 5.8.1, 5.8.2 Accept 5.8.1. Where Required. A line pressure regulator or gas appliance pressure regulator, as applicable, shall be installed where the gas supply pressure exceeds the maximum allowable inlet pressure of the appliance served.

5.8.2 Listing Line pressure regulators shall be listed in accordance with ANSI Z21.80/CSA 6.22, Line Pressure Regulators, where the outlet pressure is set to 2 psi or less.

PC 53 5.9.2.2 Reject

Chapter 6:





PC 66 Table 6.2.1(p), Table 6.2.1(q) Reject but See SR 8

SR 8 Table 6.2.1(p), Table 6.2.1(q) Accept Add a new column for EHD 39

Chapter 7:

PC 55/SR 9 7.1.6.2 Accept

PC 43 7.8.2 Reject but See SR 10



SR 10 7.8.2 Accept Delete Section 7.8.2 Point of Delivery Service Valve

PC 81 7.12.2 New Reject

PC 87 7.13.3 New Reject

PC 64 7.12.2 Reject

PC 94 7.12.2,.1 Reject

PC 84 7.12.2.3 Reject

PC 86 7.12.2.3 Reject

PC 89 7.12.2.3 Reject

PC 93 7.12.2.3 Reject

PC 82 7.12.3 Reject

PC 85 7.12.3 Reject

PC 90 7.12.3 Reject





Chapter 9:

PC 69 9.1.8.2 Reject


PC 65 9.1.24 Reject and Hold The Committee wishes to review the newly suggested standards prior to considering taking an action. Hold for possible 2021 Edition revisions.

PC 73 9.1.24 Reject

PC 74 9.1.24 Reject

PC 56/SR 22 9.6.5.3 Accept

PC 44 Figure 9.6.8 Reject but See SR 23

SR 23 Figure 9.6.8 Accept Return text to 2015 Edition text: “3 in. (80 mm) minimum”

Chapter 10:

SR 28 10.4.4.3 Accept 10.4.4.3 Exhaust ducts shall be constructed of rigid metallic material. Transition ducts used to connect the dryer to the exhaust duct shall be listed and labeled in accordance with ANSI/UL 2158A, Clothes Dryer Transition Ducts, for that application or and installed in accordance with the clothes dryer manufacturer’s installation instructions.

PC 46 10.8 Reject but Hold New topic. Committee wishes to review the proposed changes prior to taking an action. Hold for possible 2021 Edition revision.

PC 47 10.9 Reject but Hold New topic. Committee wishes to review the proposed changes prior to taking an action. Hold for possible 2021 Edition revision.








SR 24 10.22.1.1 Accept Delete section 10.22.1.1

Chapter 12:

PC 51 Table 12.5.1 Reject but See SR 14

SR 14 Table 12.5.1 Accept Revisions to format, editorial, and correct section reference.

PC 76 Table 12.5.1 Reject PC 72 12.5.2, 12.5.3 Reject but See SR 13

SR 13 12.5.2, 12.5.3 Accept 12.5.2 Plastic Piping. Where plastic piping is used to vent an appliance, the appliance shall be listed for use with such venting materials and the appliance manufacturer's installation instructions shall identify the specific plastic piping material. The plastic pipe venting materials shall be labelled in accordance with the product standards specified by the appliance manufacturer or shall be listed and labeled in accordance with UL 1738.

12.5.3 Plastic Vent Joints. Plastic pipe and fittings used to vent appliances shall be installed in accordance with the appliance manufacturer's installation instructions. Plastic pipe venting materials listed and labeled in accordance with UL 1738 shall be installed in accordance with the vent manufacturer’s installation instructions. Where primer is required, it shall be of a contrasting color.

CI 70 - Failed ballot item

Table 12.5.1, 12.5.2, 12.5.3, 12.5.4

No Action Needed – not a public comment

See SR 13 and SR 14 for action on submitted public comments related to this issue.


PC 79 12.6.1.3 Reject and See SR 16





SR 16 12.6.1.3 Accept Masonry chimneys shall be built and installed in accordance with NFPA 211 and lined with approved one of the following: 1. Approved clay flue lining, a listed chimney lining system, or other 2. A chimney lining system listed and labeled in accordance with ANSI/UL1777, Chimney Liners, or 3. Other approved material that resists corrosion, erosion, softening, or cracking from vent gases at temperatures up to 1800°F (982°C).

Annex A:

SR 33 Table A.5.6 Accepted after the meeting by consent

Revise Table A.5.6 by updating the table to reflect the all of Section 5.6, piping materials and joining methods.

PC 75 A.5.6.6.4 Reject

PC 83 A.7.12.2 Reject

PC 96 A.7.12.2 Reject but See SR 11

SR 11 A.7.12.2 Accept Keep existing 2015 Edition text but move some to A.7.12.2.3

PC 95 A.7.12.2.3 Reject

Annex C:

PC 50/SR 25 C.3 Accept

Annex K:

PC 52 K.1, K.2 Reject but See SR 31

SR 31 K.1, K.2 Accept Staff to review the standards list and update dates as appropriate.

PC 78 K.2.5 Reject

From: Tull, SteveTo: Cabot, PaulSubject: Request for formal interpretationDate: Wednesday, June 15, 2016 12:43:51 PMAttachments: image001.pngImportance: High

Mr. Cabot,Per our conversation on 6/13/2016, I am requesting a formal interpretation of NFPA 54 Section9.6.5.1 (A).

The code states “Where a connector is used, the valve shall be installed upstream of the connector. A union or flanged connection shall be provided downstream from the valve to permit removal ofappliance controls.”

My question is whether a “union or flanged connector” is required when an appliance is connectedwith an approved appliance connector? I understand the intent of the code, which is forserviceability of the appliances gas valve. However, the appliance connectors are technically a flarefitting (as stated on the appliance connector) which doesn’t meet the “letter” of the code. The line Ihighlighted above is also located under the section of code discussing the location of the shut offvalves and not installation of piping or connecting appliances. I do not believe the intent of thissection of the code was to require unions or flanged connectors when using appliance connectors. Ibelieve that the wording in the code should be addressed and either eliminated or clarified.

Thank you for your attention to this matter and I look forward to the Committee’s response.

Steve TullManager of Compliance and Gas Conversions

350 S Queen StDover, DE 19904302-734-6797 Ext. 6782302-363-3561 Cell302-735-3077 [email protected]

ATTACHMENT D - Request for Formal Interpretation

mailto:[email protected]:[email protected]:[email protected]

ATTACHMENT E – Formal Interpretation Request

June 20, 2016

Mr. Paul Cabot, Administrator - National Fuel Gas Code Committee C/O American Gas Association 400 North Capitol Street, NW Washington, DC 20001

Re: Request for Formal Interpretation

Mr. Cabot, The code states in section 9.6.5 Appliance Shutoff Valves and Connections. Each appliance connected to a piping system shall have an accessible, approved manual shut off valve with a nondisplaceable valve member, or a listed gas convenience outlet. Appliance shutoff valves and convenience outlets shall serve a single appliance only, and shall be installed with 9.6.5.1

My question is “If an appliance is not installed, why would a need for a shutoff valve be installed?” I understand that the code shutoff valve intent, which is for the serviceability of the gas appliance. If a gas appliance is not installed, and a shutoff valve is be provided, it would marginalize the intent of code section 1.1.1.1 “This code is a safety code”. Since the pre placement of the shutoff valve would allow/ enable third parties, other than 3.3.81 a “Qualified Agency” to install the undetermined gas appliance readily, without any competency; eluding the approval of the 3.2.2 “AHJ” to their actions.

However, with their potential for not knowing or understanding the true dynamics of the gas appliance to be installed, fosters the ability of a potentially dangerous installation, considering: Approval of Appliance to be Installed; Correct Fuel Gas Type; Appliance Support; Appliance Location; Pressure Regulator Requirements; Combustion Air Requirements; Materials and Their Applicable Listings; Proper Pipe Sizing / Piping Capacity; Joining Methods; Required Clearances; Servicing Accessibility; Appliance Venting and Vent Termination; Gas Delivery Pressure, Appliance Connectors; Leak Checking; Purging etc.

I do not believe the intent of this section of the code was to require shutoff valves to be installed prior to the approved gas appliance being seated on site, so the aforementioned minimal code conditions can be reviewed and instituted to provide a safe installation and approval by the AHJ.

Thank you for your attention, and I look forward to the Committee’s input and response.

Regards,

Mike Deegan Operations Coordinator Clearwater Gas System

7/13/2016

1

A Quick Summary of Methods and Issues

John S. RobertsRimkus Consulting Group

6/21/2016NFPA 54 Phoenix, AZ 1

Natural Gas – Odorant added at point of transfer◦ City Gates◦ Added to flowing gas, usually 0.5 to 1 lb per

MMSCF Propane – Added at a point when the propane

is transported by truck or rail◦ Pipeline terminal, refinery, rail terminal or gas plant◦ Added to liquefied gas◦ Gas becomes odorized when odorant and propane

vaporize


Usually tertiary Butyl Mercaptan and some other component

Other components are Thiophane, n-Propyl Mercaptan, Isopropyl Mercaptan, sec-Butyl Mercaptan, Dimethyl Sulfide (DMS) or Methyl Ethyl Sulfide (MES)

DMS and MES are diluents and have a much poorer odor than the mercaptans

Added using injection or bypass odorizers to flowing gas


tertiary-Butyl Mercaptan (TBM) used as it has a very good odor and is the most stable mercaptan odorant

Best stability to oxidation and adsorption on soils

Thiophane has some use, but may be more historic usage. Also does not oxidize

The worst at soil adsorption and pipe adsorption

The odor is not comparable to mercaptans


ATTACHMENT F - Odorization Basics Presentation

7/13/2016

2

Flow rates – Gas must flow – Static gas will not retain odorant

Within a house or most commercial applications this is not a problem as the volume of gas is quite low and pressures are low

With a gas distribution system with miles of pipe at high pressures, this becomes a significant problem


Hydrocarbon liquids – pooling of liquids in distribution lines can remove odorant due to absorption.

A problem that can be found in gas producing areas and is a function of the price of propane and other liquids found in Natural Gas Liquids (NGLs) (typically)

TBM is a liquid with a melting point of 31 F so requires a diluent to keep the material in a liquid condition at much lower temperatures


New lines – Gas distribution systems can have long stretches of new gas lines. These can become adsorption sites, and may need to have supplemental odorization. New lines need to be monitored for odorization.


Ethyl Mercaptan is the only odorant for propane currently utilized in the US or Canada

Added at a rate if 1.5 pound odorant per 10,000 gallons of propane, although standard is 1 pound per 10,000 gallons

Added to liquefied propane using a pump or some other method


7/13/2016

3

Propane/Odorant is a problem in vapor-liquid equilibrium

Propane has a boiling point of -44 F. Ethyl Mercaptan (EM)has a boiling point of 95

F This means that EM and propane are not

found in the vapor at the same concentration as in the liquid

The ratio of the concentration of EM in the vapor to EM in the liquid is the K-factor


This changes with respect to temperature◦ K = 0.11 at -10 F◦ K = 0.22 at 95 F

This means that at 95 F, the amount of EM in the vapor is 22% of the amount of EM in the liquid

The odorant level is set up with this in mind Other odorants, such as thiophane, require much

higher concentrations, which is why 6.4 pounds per 10,000 gallons is utilized◦ K = 0.007 at -10 F◦ K = 0.033 at 95 F


Oxidation◦ Mercaptan odorants can be oxidized Natural gas by rust (Fe2O3) in pipelines Propane by rust in tankage◦ Thiophane is not oxidizable by rust

Adsorption◦ All odorants can be adsorbed by surfaces◦ This can be piping, clothing, concrete, etc.◦ The higher the molecular weight the worse the

problem, typically


Adsorption – Soil◦ This is a slightly different problem◦ Odorants are adsorbed by soil in the following

order: Clay >> Silt > Sand > Gravel This order is in terms of particle size of particles and

also the surface area of each entity Clays have very high surface areas◦ Interestingly, the ease of movement of gas through

these entities is: Gravel > Sand > Silt >> Clay


7/13/2016

4

Adaptation – Getting used to the odor◦ One must respond immediately to a gas odor

Recognition◦ Misidentification – Is that the odor of a dead rat or

is it a gas leak?◦ Scratch and Sniffs have improved this issue for

natural gas and propane◦ The increased presence of propane in the

environment (propane grills) has increased propane odor recognition


Anosmia – No sense of smell – not a well defined population but probably about 0.2% of population

Aging – In general, as one grows older your nasal acuity decreases.

One must be in the presence of gas in order to smell the odorant.

Sleep – Thought to be a problem, but there are no real studies done on this issue. Last attempt was made in the 1930’s. Could be a subset of Adaptation



Attachment A Meeting Attendance.pdfEmbassy Suites Biltmore Phoenix

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