g economizers

8/6/2019 G Economizers

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G-1

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CONTENTS

FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-3PRODUCT OFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4

Standard Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4

DIMENSIONS AND WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4PERFORMANCE DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4ENGINEERING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-6SAMPLE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-15

Section G

ECONOMIZERS

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Section G

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ILLUSTRATIONS

Figure G-1. E+Plus Economizer Mounting to Firetube Boiler (Model CBBoilers) . . . . . . . . . . . . . . G-8Figure G-2. Economizer Above Industrial Watertube Boiler (Example) . . . . . . . . . . . . . . . . . . . . . G-9Figure G-3. Economizer on Side of Industrial Watertube Boiler (Example) . . . . . . . . . . . . . . . . . G-10

Figure G-4. Typical Economizer Feedwater Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-11

Figure G-5. Typical Economizer Feedwater Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-11Figure G-6. Typical Economizer Feedwater Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-12Figure G-7. Typical Economizer Feedwater Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-12Figure G-8. Typical Economizer Feedwater Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-13Figure G-9. Typical Economizer Feedwater Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-13

TABLES

Table G-1. Firetube Boiler E+Plus Economizers Dimensions and Weights (Model CB Boilers) . . . . G-5Table G-2. Industrial Watertube Boiler Rectangular Economizers, Dimensions and Weights . . . . . . G-5Table G-3. Firetube Boiler E+Plus Economizer, Performance Data (Model CB Boilers) . . . . . . . . . G-6Table G-4. Industrial Watertube Boilers Rectangular Economizer Performance Data . . . . . . . . . . . G-7Table G-5. Firetube Boiler E+Plus Economizers, Efficiencies (Model CB Boilers) . . . . . . . . . . . . . G-7

Table G-6. Industrial Watertube Boiler Rectangular Economizers, Efficiencies . . . . . . . . . . . . . . . . G-7

This section contains information on Economizers. An economizer recovers heat from flue gases and uses it toincrease boiler feedwater temperatures, prior to entering the boiler. Cleaver-Brooks offers a variety of types,sizes, and custom designs. Each assures proper match for your specific firetube or watertube boiler.


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Section G

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FEATURES AND BENEFITS

Reduces Fuel Use and Cost:

Recovers heat from flue gases that would otherwise be wasted.

Heat is used to raise boiler feedwater temperature prior to entering the boiler.

Load Changes:

Rapid changes in load demands can be met faster due to higher feedwatertemperature.

Emissions:

Reduced fuel-firing rates for any given steam output means reduced NOxemissions.

ASME Construction:

Ensures high quality design and manufacturing standards.

Provides safety and reliability.

High Efficiency Heat Exchanger:

Provides uniform fin-to-tube contact for maximum heat transfer.

Fin tubing offers up to 12 times the heat exchange surface of bare tubing of thesame diameter.

Self-Draining Design:

Suitable for outdoor installation.

Low Pressure Drop:

Provides low gas side pressure drops.

Permits use of smaller forced draft fans.

Permits use of existing fans in almost all installations.

Gas Tight Combustion Stack:

Provides inner casing of carbon steel (watertube boilers).

Stainless Steel casing for the E+Plus on firetube boilers.

Compact dimensions provide for easy installation.

Feedwater Preheating System: (watertube boilers)

Controls cold end corrosion through all flow rates.

Prevents the forming of corrosive acids in the economizer.

Prevents stack corrosion.

Guaranteed Efficiency on Model CB Firetube Boilers:

$10,000 rebated for every full 1.0% efficiency point less than guaranteed.


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Section G

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09-06

PRODUCT OFFERING

Cleaver-Brooks offers a line of custom-engineered economizers for boiler sizes up toand including 150 MMBtu/hr. input. The model E+Plus Fuel Economizers, areavailable for firetube boilers up to 1800 HP.

Standard Equipment Equipment described is for the standard E+Plus Fuel Economizer, as defined laterin the specifications, and in the current literature.

Standards for both cylindrical and rectangular E+Plus Economizers include:

Designed and fabricated in accordance with the ASME Boiler and PressureVessel Code, UM stamp standard, U stamp and Section I optional.

Thermometer and safety valve connections at the feedwater headers.

Incorporates self-draining design.

Safety valve.

Optional Equipment Vertical or horizontal flue gas flow patterns on rectangular design.

Utilization of waste gas.

Soot blowers for oil firing.

Feedwater and sootblower piping from economizer to boiler (watertube boilersonly).

Feedwater preheating system (watertube boilers only).

DIMENSIONS AND WEIGHTS

Information in this section outlines typical dimensions and weights of aneconomizer, and typical ratings and efficiencies when utilizing an economizer.

Table G-1 lists dimensions and weights for a E+Plus Economizer typically installedwith a firetube boiler. (Model CB Boilers).

Table G-2 lists dimensions and weights for a rectangular Economizer typically

installed with an industrial watertube boiler.The selection of a cylindrical or rectangular economizer for a particular applicationwill depend on type and capacity of the boiler and job site conditions.

PERFORMANCE DATA

Tables listed here contain performance data for:

Gas fired, 100 through 800 hp firetube boilers operating at 125 psig, andutilizing a E+Plus fuel economizer.

Gas fired, industrial watertube boilers operating at 150 psig and utilizing arectangular fuel economizer.

For additional operating pressures, load capacity or fuel selections, contact yourlocal Cleaver-Brooks authorized representative.

Table G-3 lists typical water and gas side temperatures when utilizing a E+PlusEconomizer with a firetube boiler (Model CB & CB-LE Boilers).

Notice

Do not use on boilers equipped with flue gas recirculation. Contact your localCleaver-Brooks authorized representative.

Table G-4 lists typical water and gas side temperatures when utilizing a rectangular


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Section G

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BOILERHP

ECONOMIZERMODEL

NUMBER

DIMEN-

SIONS(AP-PROX)

DRYUNITWEIGHT

(LBS)

WIDTH(IN.)

DEPTH(IN.)

HEIGHT(IN.)

100 hp CBC 16A6AL 30RD - 25 270

125 hp CBC 18D7AL 30RD - 37 380

150 hp CBC 18D7AL 30RD - 37 381

200 hp CBC 18E6AL 30RD - 41 410

250 hp CBR 30H7AL 52 43 58.3 1320

300 hp CBR 30H7AL 52 43 58.3 1320

350 hp CBR 30F7AL 52 43 50 1120

400 hp CBR 36F7AL 60 50 50 1470

500 hp CBR 36G 6AL 60 50 54.2 1596

600 hp CBR 36H5AL 60 50 58.3 1716

700 hp CBR 36J5AL 60 50 66.8 1961

800 hp CBR 36J5AL 60 50 66.8 1961

NOTES:1. Dimensions in inches.2. Boiler firing natural gas.3. Boiler operating pressure is 125 psig (acceptable tolerance is 5 psig).4. Contact your local Cleaver-Brooks representative for sizing detail.

Model CBCs are cylindricalModel CBRs are rectangular

Table G-1. Firetube Boiler E+Plus

Economizers Dimensions and Weights

(Model CB Boilers)

BOILERMODEL

ECONOMIZERGAS FLOWDIRECTION(EXAMPLE)

APPROXIMATE DIMENSIONS(INCHES)

DRY UNITWEIGHT

(LBS)LENGTH WIDTH HEIGHT

D-34 VERTICAL 105 29 76 4400

D-52 HORIZONTAL 49 110 47 5800

D-76 VERTICAL 140 47 76 8800

D-94 VERTICAL 155 59 80 11600

NOTES:1. Dimensions in inches.2. Data indicated is for select applications. Each Economizer is designed on a job to job basis.3. Boiler is firing natural gas.4. Boiler operating pressure is 150 psig (acceptable tolerance is 5 psig).5. Economizer gas flow direction can be either horizontal or vertical.

Table G-2. Industrial Watertube Boiler Rectangular Economizers,

Dimensions and Weights


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E+Plus Economizer with an industrial watertube boiler.

Table G-5 lists typical increases in efficiency for a firetube boiler (Model CB & CB-LE Boilers).

Table G-6 lists typical increases in efficiency for an industrial watertube boiler.

ENGINEERING DATA

Information in this section outlines typical installation. Actual installation andpiping arrangements will be dictated by design, state, provincial or local codes, andjob-site conditions.

Firetube Boilers (Model CB & CB-LE Boilers)

Installation - economizer above boiler:

All standard firetube boilers (100 hp and above) can support up to 2,000 lbswithout additional reinforcement.

Firetube boilers up to 250 hp can be reinforced to support 2,500 lbs, however,this must be specified.

Firetube boiler sizes 250 hp through 800 hp can be reinforced to support3,000 lbs, however, this must be specified.

All weights listed inTable G-1 are shipping weights. When installed, the waterweight must be added to obtain total load to be supported. Use an average add-on of 200 lbs.

Add the weight of any stack (if unsupported) from the economizer to theoutside.

BOILER

HP

LOAD

%

ECONOMIZER

MODEL NO.

WATER SIDE GAS SIDE

ENERGY

SAVED

BTU/HR

HEATING

SURFACE

SQ-FTFLOWPPH

TEMPERATURE PRESS.DROP

PSIG

FLOWPPH

TEMPERATURE PRESS.DROP

IN. WCIN F OUTF IN F OUT F

100 100 CBC-16A6AL 3356 227 258 1.5 3611 410 303 0.22 125500 151

125 100 CBC-18D6AL 4195 227 275 3.92 4586 465 301 0.13 247800 316

150 100 CBC-18D7AL 5034 227 265 5.44 5432 420 290 0.18 229900 316

200 100 CBC-18E6AL 6711 227 256 10.4 7191 395 295 0.2 229400 309

250 100 CBC-30H7AL 8389 227 271 0.01 9158 460 310 0.1 451800 733

300 100 CBC-30H7AL 10067 227 265 0.01 10910 435 304 0.14 466800 733

350 100 CBC-30F7AL 11745 227 259 0.01 12638 410 301 0.26 447500 611

400 100 CBC-36F7AL 13423 227 262 0.02 14470 425 304 0.24 571900 733

500 100 CBC-36G6AL 16779 227 251 0.03 17883 385 299 0.24 490900 699

600 100 CBC-36H5AL 20134 227 247 0.03 21399 370 305 0.24 476200 645

700 100 CBC-36J5AL 23490 227 245 0.03 24895 365 300 0.24 513600 753

800 100 CBC-36J5AL 26846 227 245 0.04 28491 370 304 0.31 597700 753

NOTES:1. Feedwater temperature to economizer is at least 220 F (Deaerated).2. Boiler operating pressure is 125 psig (acceptable tolerance 5 psig).3. Gas side flow (pph) determined with 10% excess air (50 to 100% of capacity).4. Continuous modulated feedwater flow must be provided.5. Boiler firing natural gas6. Contact your local Cleaver-Brooks representative for sizing detail.

Table G-3. Firetube Boiler E+Plus Economizer, Performance Data (Model CB Boilers)


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Although the economizer can support additional weight, the total weight ofeconomizer and stack will very likely exceed the allowable weight on the boiler.Be certain that either the economizer or the stack, or both, are supportedexternal from the boiler.

If an expansion joint is used, the economizer and stack must be supported toensure all loading is removed from the expansion joint.

MODELNO.

LOAD%

ECONOMIZER

WATER SIDE GAS SIDE

HEATRECOVERED

BTU/HR

HEATINGSURFACE

SQ-FTFLOWPPH

TEMPERATUREPRESS.DROPPSIG

FLOWPPH

TEMPERATURE PRESS-DROPIN. WC

(MAX)IN F OUT F IN F OUT F

D-34 100 15000 225 292 6.8 15884 532 318 0.75 1237000 786

D-52 100 31000 225 292 5.6 32582 532 318 0.75 2530000 1616

D-76 100 51500 225 280 8.1 53999 498 318 0.75 3424000 2370

D-94 100 63000 225 269 9.9 66018 459 318 0.75 3260000 2462

NOTES:1. Feedwater temperature to Economizer is at least 220 F (Deaerated).2. Boiler operating pressure is 150 psig (acceptable tolerance 5 psig).3. Gas side flow (pph) determined with 10% excess air.4. Continuous modulated feedwater must be provided.5. Data indicated is for select application. Each Economizer is designed on a job to job basis.6. Boiler is firing natural gas.

BOILER

HP

LOAD%

ECONOMIZERMODEL NO.

EFFW/0

ECON

% FUELSAVED

EFFWITH

ECON

100 hp 100 CBC-16A6AL 82.05 2.50 84.55

125 hp 100 CBC-18D6AL 80.76 3.84 84.6

150 hp 100 CBC-18D7AL 81.81 3.04 84.85

200 hp 100 CBC-18E6AL 82.40 2.34 84.74

250 hp 100 CBC-30H7AL 80.87 3.52 84.39

300 hp 100 CBC-30H7AL 81.46 3.07 84.53

350 hp 100 CBC-30F7AL 82.05 2.55 84.6

400 hp 100 CBC-36F7AL 81.89 2.84 84.73

500 hp 100 CBC-36G6AL 82.83 2.01 84.84

600 hp 100 CBC-36H5AL 83.07 1.63 84.7

700 hp 100 CBC-36J5AL 83.30 1.54 84.84

800 hp 100 CBC-36J5AL 83.18 1.55 84.73

NOTES:1. Feedwater temperature to Economizer 227 F (Deaerated).2. Selections are based on best Btu savings per dollar costs.3. Boiler is firing natural gas.4. Boiler operating pressure is 125 psig (acceptable tolerance 5 psig).

4. Contact your local Cleaver-Brooks representative for sizing de-tail.

BOILER

MODEL

LOAD

%

FLOW

PPH

EFF

W/OECON

% FUEL

SAVED

EFF

WITHECON

D-34 100 15000 77.47 6.3 82.72

D-52 100 31000 78.07 6.3 83.34

D-76 100 51500 79.17 5.2 83.54

D-94 100 63000 80.15 4.1 83.59

NOTES:1. Feedwater temperature to Economizer is at least 220 F(Deaerated).

2. Savings depend on total design of the system.3. Data indicated is for select applications. Each Economizer is

designed on a job to job basis.4. Boiler is firing natural gas.5. Boiler operating pressure is 150 psig (acceptable tolerance 5 psig).

Table G-4. Industrial Watertube Boilers Rectangular Economizer Performance Data

Table G-5. Firetube Boiler E+Plus Economizers,

Efficiencies (Model CB Boilers)

Table G-6. Industrial Watertube BoilerRectangular Economizers, Efficiencies


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Refer to Figure G-1 for suggested mounting to a firetube boiler (Model CB & CB-LE Boilers).

For information on other Cleaver-Brooks Firetube Boilers, contact your local Cleaver-Brooks authorized representative.

Note: Spool between economizer and boiler may be required to clear front headdavit arm (consult factory).

Industrial Watertube Boilers

Installation - economizer above boiler:

Maximum vertical loading of top mounted economizer and stack at theboiler connection must not exceed 2,000 lbs. The stack must be top-guidedto prevent any overturning moment at boiler connection.

The economizer and stack must be supported to ensure all loading isremoved from the expansion joint.

All weights listed in Table G-2 are shipping weights. When installed, thewater weight must be added to obtain total load to be supported. Waterweights will vary and can only be obtained after economizer is selected.

Refer to Figure G-2 for suggested mounting above an industrial watertubeboiler.

BOLT SPECIFICATIONS

Boiler hp 100 125-200 250-350 400-800

No. of Bolts 8 12 12 16

Bolt Size 3/8 - 16 (threads per inch)

Bolt Circle 13-7/8 17-7/8 21-7/8 25-7/8

Vent Opening(OD)

12 16 20 24

NOTES:1. Dimensions in inches.2. For allowable weights on vent stub refer to dimensions andweights in this section.3. For information on stacks refer to Section F.

Figure G-1. E+Plus Economizer Mounting to

Firetube Boiler (Model CB Boilers)
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Installation - economizer on side of boiler:

Breeching must be supported to ensure all loading is removed fromexpansion joints.

Concrete must be suitably reinforced. Piers and footings must be designed tomeet soil conditions and local ordinances at job site.

The economizer support stand must be designed to support the economizer

and water weight. All weights listed in Table G-2 are shipping weights.When installed, the water must be added to obtain total load to besupported. Water weights will vary and can only be obtained aftereconomizer is selected.

Refer to Figure G-3 for suggested mounting on side of an industrialwatertube boiler.

Feedwater Piping

Piping arrangements are dictated by ASME Code, location of the economizer inrelation to the boiler, and feedwater regulating system.

Figure G-4 outlines typical feedwater piping per ASME Code jurisdiction. If the

economizer can be shut off from the boiler by valve(s), the economizer musthave a safety valve and the boiler must have feed and check valves. Refer toFigure G-5.

Figure G-5 outlines feedwater piping with the economizer mounted above theboiler.

Figure G-6 outlines feedwater piping with the economizer mounted and theeconomizer outlet at or below water level in boiler drums.

Figure G-7, Figure G-8, and Figure G-9 outline different feedwater pipingarrangements with the economizer mounted above the boiler and with gas andwater isolation by-passes.

Figure G-2. Economizer Above Industrial Watertube Boiler (Example)
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Figure G-3. Economizer on Side of Industrial Watertube Boiler (Example)


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Figure G-4. Typical Economizer Feedwater Piping


REFER TO PRODUCT OFFERING, PAGE G-3.


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Notes


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Section G

Economizer Sample Specifications

E+Plus CBC Cylindricalfor Firetube Boilers

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-16Construction Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-16Quality Control And Code Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-17

SAMPLE SPECIFICATIONS

The following sample specification is provided by Cleaver- Brooks to assist you in specifying your customersspecific needs and application.
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Section G

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PART 1 GENERAL 1.1 GENERAL

Specifications for E+Plus cylindrical economizers shall include the furnishing of(__CBC-XXXX) complete packaged, extended surface boiler economizer(s), asfurnished by Cleaver-Brooks.

PART 2 PRODUCTS 2.1 CONSTRUCTION SPECIFICATIONS

A. The economizer's heating surface shall be a multiple circular coildesign with manifold for minimum water pressure drop as required:Headers: thickness: Sch80; material: [ ] SA 53 GrB carbon steel or[ ] TP304 stainless steel.Alternate finned tube heating surfaces:[ ] 316L stainless steel tube x .065" minimum wall thickness withaluminum fin x .020" thickness x .50 high brazed to the tube[ ] Carbon steel tube SA 178 ERW GrA x .085" minimum wallthickness with carbon steel fin x .030" thickness x .50 high brazedto the tube[ ] Duplex stainless steel tube x .049" minimum wall thickness with

aluminum fin x .020" thickness x .50 high brazed to the tube[ ] 316L stainless steel tube x .065" minimum wall thickness withstainless steel fin x .020" thickness x .50 high brazed to the tubeFins per inch shall be per fuel type fouling requirements.

B. The gas tight housing shall consist of a structural reinforced designshell and designed with a 10GA minimum thickness SA36 carbonsteel thickness cylindrical lid ([ ] alternate 304 stainless steel).18GA stainless steel 'gull wing' type access doors shall be providedwhich can provide for complete access to the heating surface forinspection and/or cleaning. In addition the inspection panels shallbe hinged and secured by quick release tension latches requiring notools to open and close for access to the heating surface. Access

doors shall be insulated with 2" thickness of high temperatureinsulation and shall contain a stainless steel door panel. Customerstack mating flanges and gaskets shall also be provided anddesigned to match the economizer gas connections. Exteriorsurfaces other than stainless shall be painted with high temperaturepaint suitable for exhaust temperatures entering and for outdoorinstallation. Additional required equipment included shall include:(2) 50-300(F 3" dial bimetallic water thermometers with well, (2)150-750(F 3" dial adjustable bimetallic flue gas temperaturethermometers. (1) 250 PSI ASME safety relief valve.

C. Maximum heat transfer performance shall result from counter flowwater to the exhaust gas flow, maximizing entering temperaturedifferences. A condensate drain catch ring assembly with 1" NPTdrain shall be provided for draining condensation away from theboiler as it could occur either within the economizer and/oreconomizer outlet stack breaching. The economizer's design shallalso include an internal heat resistant design exhaust gas damper,allowing for the reduction of combustion back pressure as required,and/or for controlling exhaust gas temperature exiting, and/or forcontrolling heat transfer for minimum performance as necessary.


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09-02

PART 2 PRODUCTS 2.2 SELECTION PARAMETERS

Design Requirements

Performance design parameters for the economizer are asfollows:Primary fuel type: [ ] natural gas [ ] No.2 fuel oilMaximum Firing output rate to the economizer:Exhaust Flow Rate, pph:-Inlet exhaust temperature (f:Cooled exhaust temperature (f:-Pressure drop " W.C. Max.:Water Flow Rate, lbs/hr:-Entering Temp.(f:-HeatedTemp.(f:Press. Drop, psigHeat transferred, MBtu/hr.:

PART 3 EXECUTION 3.1 QUALITY CONTROL AND CODE REQUIREMENTS

A. Economizer is to be designed and fabricated in accordance with the

ASME Boiler and Pressure Vessel Code, Section VIII Division I (UMstamp).Options available:

[ ] Optional U stamp.

[ ] Optional Section I stamp

[ ] Optional CRN stamp

B. Minimum design temperature is to be 700 F.

C. Unit shall be hydrostatically tested at 1.5 times the design pressurein the presence of a Code Inspector.

D. Unit is to be ASME Code Stamped, and is to include nameplate andapplicable code papers.


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NOTES


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Section G


E+Plus CBR Rectangularfor Firetube Boilers

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Construction Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Quality Control And Code Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21




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Specifications for E+Plus cylindrical economizers shall include the furnishing of(__CBR-XXXX) complete packaged, extended surface boiler economizer(s), asfurnished by Cleaver-Brooks.

PART 2 PRODUCTS 2.1 CONSTRUCTION SPECIFICATIONS

A. The economizer's heating surface shall consist of finned tubesattached to water manifolds as mounted to the exterior of the shellto minimize corrosion and to achieve low liquid pressure drop. Thefinned tubes shall be attached with compression fittings to theheader manifolds for ease of tube replacement requiring no welding.The finned tube shall have a maximum of 2 rows in the exhauststream in order to achieve visual access of the heating surface andeffective cleaning when needed. The finned tubes shall not haveany tube to tube welds in the exhaust flow for extended economizerlife:Header manifold: thickness: Sch80; material: [ ] SA 53 GrB carbon

steel or [ ] TP304 stainless steel.Alternate finned tube heating surfaces:[ ] 316L stainless steel tube x .065" minimum wall thickness withaluminum fin x .020" thickness x .50 high brazed to the tube[ ] Carbon steel tube SA 178 ERW GrA x .085" minimum wallthickness with carbon steel fin x .030" thickness x .50 high brazedto the tube[ ] Duplex stainless steel tube x .049" minimum wall thickness withaluminum fin x .020" thickness x .50 high brazed to the tube[ ] 316L stainless steel tube x .065" minimum wall thickness withstainless steel fin x .020" thickness x .50 high brazed to the tubeFins per inch shall be per fuel type fouling requirements.

B. The gas tight housing shall consist of a structural reinforced designexterior and designed with a 10GA minimum thickness SA36carbon steel thickness ([ ] alternate 304 stainless steel). A hingedaccess door shall be provided which can provide for completeaccess to the heating surface for inspection, cleaning, or tuberemoval. The economizer shall be insulated with 2" thickness ofhigh temperature insulation and shall be lined with 304 stainlesssteel. A pair of stack adapters and gaskets shall also be provided toconnect the economizer flanged exhaust connections with the boilerexhaust diameter size for slip fit connection.

C. Exterior surfaces other than stainless shall be painted with hightemperature paint suitable for exhaust temperatures entering and foroutdoor installation. Additional required equipment included shallinclude: (2) 50-300(F 3" dial bimetallic water thermometers withwell, (2) 150-750(F 3" dial adjustable bimetallic flue gastemperature thermometers, (1) 250 PSI ASME safety relief valve.


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D. Maximum heat transfer performance shall result from counter flowwater to the exhaust gas flow, maximizing entering temperaturedifferences. A condensate drain catch ring assembly with 1" NPTdrain shall be provided for draining condensation away from theboiler as it could occur either within the economizer and/oreconomizer outlet stack breaching. The economizer's design shall

also include an internal heat resistant design exhaust gas damper,allowing for the reduction of combustion back pressure as required,and/or for controlling exhaust gas temperature exiting, and/or forcontrolling heat transfer for minimum performance as necessary.

PART 2 PRODUCTS 2.2 SELECTION PARAMETERS

Performance design parameters for the economizer are as follows:Primary fuel type: [ ] natural gas [ ] No.2 fuel oilMaximum Firing output rate to the economizer:Exhaust Flow Rate, pph:-Inlet exhaust temperature (F:Cooled exhaust temperature (F:

-Pressure drop " W.C. Max.:Water Flow Rate, lbs/hr:-Entering Temp.(F:-Heated Temp.(F:Press. Drop, PSIGHeat transferred, MBtu/hr.:


A. Economizer is to be designed and fabricated in accordance with theASME Boiler and Pressure Vessel Code, Section VIII Division I (UMstamp).Options available:

[ ] Optional U stamp.[ ] Optional Section I stamp

[ ] Optional CRN stamp

B. Minimum design temperature is to be 700 F.




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NOTES


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for Watertube Boilers

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Construction Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Quality Control And Code Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25




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A. Specifications for Boilermate cylindrical and rectangulareconomizers shall include the furnishing of (___________) completepackaged, extended surface boiler economizer(s), as furnished by

Cleaver-Brooks.PART 2 PRODUCTS 2.1 CONSTRUCTION SPECIFICATIONS

A. 1.0 GeneralSpecifications for Boilermate cylindrical and rectangulareconomizers shall include the furnishing of (___________) completepackaged, extended surface boiler economizer(s), as furnished byCleaver-Brooks.

B. Common Construction Specifications

Tube material is to be SA-178-A boiler tube.

Extended surface is to be of solid, continuous, high- frequency, resistancewelded carbon steel fins. Serrated fins are not acceptable.

Tube arrangement is to be square pitch only. Triangular or staggered tubepitch will not be acceptable.

Inner casing is to be a minimum of 10-gauge carbon steel.

Insulation type is to be mineral wool.

Outer casing is to be weather-proof with a minimum 27- gauge, corrugated,galvanized, carbon steel casing. All exposed surfaces not enclosed by theouter casing are to be painted with high-temperature paint.

The economizer shall be completely drainable by gravity, after installation.

Safety valve to be supplied.

C. 3.0 Specifications Specific To Cylindrical Economizers The economizer shall be of the cylindrical design.

Fins are to be not less than .060" thick.

The economizer shall be equipped with a built-in sootblower and shallutilize lane blowing to provide maximum cleaning capabilities. Longitudinalor mass blowing shall not be acceptable.

For economizers used on boilers which have an on/off type feedwatercontrol system, a modulating feedwater system shall be incorporated intothe system to ensure proper economizer operation.

D. Specifications Specific To Rectangular Economizers

Tubes are to be commercially available 2" OD. Fins are to be not less than .075" thick.

Tube sheets are to be of the open lattice design. Tube walls (pressure parts)shall not be in contact with tube sheets. The fins shall rest on the tubesheet.

Sootblower wall boxes and distal bearings shall be included and are to beinstalled on the economizer by the vendor. Sootblowers shall be installed


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(when specified) transversely to provide maximum cleaning capabilities.Longitudinal or mass blowing shall not be acceptable.

An insulated access door of carbon steel construction, 16" square inside-to-inside, shall be included in the economizer design.

E. Quality Control And Code Requirements

Economizer is to be designed and fabricated in accordance with the ASMEBoiler and Pressure Vessel Code, Section I, Power Boilers.

Minimum design temperature is to be 700 F.

Unit shall be hydrostatically tested at 1.5 times the design pressure in thepresence of a Code Inspector.

Unit is to be ASME Code Stamped, and is to include nameplate andapplicable code papers.


A. Economizer is to be designed and fabricated in accordance with theASME Boiler and Pressure Vessel Code, Section VIII Division I (UM

stamp), Power Boilers.B. Minimum design temperature is to be 700 F.




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g economizers

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