P Properly Designing l D i i A Boiler Exhaust System A Boiler - - PowerPoint PPT Presentation

P l D i i Properly Designing A Boiler Exhaust System A Boiler Exhaust System

Common Problems Of Improperly Designed Boiler Exhaust Systems

Common Problems

Boiler Inefficiency Flame Ignition Failure Dow ntime

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Common Problems

Excess draft in the stack Insufficient draft in the stack

Factors Factors

Improper breeching sizing Improper stack sizing Poorly designed ventilation system Poorly designed ventilation system

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Important Criteria In Stack System Design

Boiler Categorization Stack Types Stack Sizing UL C tifi ti UL Certification Materials Of Construction

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Boiler Categorization

Boilers are divided into four categories based on the pressure and temperature produced in the exhaust stack and the likelihood of condensate production in the vent and the likelihood of condensate production in the vent.

TIVE CATEGORY II CATEGORY I NEGAT CATEGORY II APPLIANCE CATEGORY I APPLIANCE VE NON-CONDENSING CONDENSING POSITIV CATEGORY IV APPLIANCE CATEGORY III APPLIANCE

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Boiler Categorization

Category I A b il hi h i h i i Category II A b il hi h i h i i A boiler which operates with a non-positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. (B V t T A) A boiler which operates with a non-positive vent static pressure and with a vent gas temperature that may cause excessive condensate production in the vent. (T BH) (B-Vent, Type A) (Type BH) Category III A boiler which operates with a positive vent Category IV A boiler which operates with a positive vent p p pressure and with a vent gas temperature that avoids excessive condensate production in the vent. (Type BH) p p pressure and with a vent gas temperature that may cause excessive condensate production in the vent. (Type BH) ( yp ) ( yp )

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Boiler Categorization

N C d i B il Near-Condensing Boilers Condensing Boilers Condensing Boilers

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Stack Types

Type B Gas Vents

• Gas Appliance w ith Draft Hood

Gas Appliance w ith Draft Hood

• Gas Appliance w ith Draft Hood

Gas Appliance w ith Draft Hood

• Masonry

Masonry Chimneys Chimneys Liners Type BH Gas Vents

• Most Cat II, III and IV boilers
• Most Cat II, III and IV boilers

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Stack Sizing

Appliance category Altitude

Draft Draft

Appliance category Power input Altitude Flue gas velocity

calculation based on criteria calculation based on criteria

Type of fuel

Flow restriction: tees, elbows, wyes, dampers, reducers

c te a such as: c te a such as:

Flue gas temperature Stack and breeching Seasons (summer vs. winter) A d Stack and breeching diameter, height, length And more…

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Stack Sizing

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UL Certification

UL 103 (USA) / ULC959 (CAN)

Building Heating Appliance Chimney

I t d d f ith d li id id ti l t d b ildi

• Intended for use with gas and liquid residential type and building

heating appliances which vent flue gases at a temperature not exceeding 1000ºF under continuous operating conditions with a maximum rated positive pressure of 60 inches W.C., as specified in the Chimney Selection Chart of the National Fire Protection Association Standard No. 211

• Can be installed in an unenclosed installation or enclosed in a

noncombustible chase noncombustible chase

• Also complied with a temperature test at 1700ºF for 10 minutes
• 1400ºF Chimney: same as above, but for flue gases at a

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temperature not exceeding 1400ºF

UL Certification

UL 1738 (USA) / ULC S-636 (CAN)

Special Gas Vents

I t d d t b t d di tl t th fl tl t f th C t

• Intended to be connected directly to the flue outlet of the Category

II, III and IV gas burning appliances, as defined by the National Flue Gas Code, ANSI Z223.1/NFPA 54, where the maximum continuous flue gas temperature produced does not exceed 550ºF with a maximum rated positive pressure of 15 inches W.C.

• Can be installed in an unenclosed or an enclosed installation made
• f combustible materials
• Also complied with a temperature test at 1700ºF for 10 minutes

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UL Certification

UL 1777 (USA) / ULC S-635 (CAN)

I t d d t b i t ll d i hi d t t il

Chimney Liners

• Intended to be installed in masonry chimneys used to vent gas or oil

fuel fired residential type and building heating appliances where the maximum continuous flue gas temperature produced does not exceed 570ºF

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UL Certification

UL 1978 (USA & CAN)

I t d d f i i t ll ti f th l f k d

Grease Duct For Restaurant Cooking Appliances

• Intended for use in installations for the removal of smoke and

grease laden vapors in commercial and industrial applications

• They are appropriate for continuous operation at temperatures not

exceeding 500ºF exceeding 500 F

• Were evaluated in accordance with the Standard for Removal of

Smoke and Grease-Laden Vapors from Commercial Cooking Equipment, NFPA 96 Equipment, NFPA 96

• Also complied with an abnormal temperature test at 2000ºF for 30

minutes

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UL Certification

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Materials Of Construction

Installation-Ready Exhaust Systems

Structural

• Stainless steel (304 / 316 / 301 / AL29 4C)

( )

• Aluminized steel
• ABS / PVC / CPVC / POLYETHYLENE
• Galvanized steel

Insulation

• Air
• Mineral fiber
• Ceramic fiber

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Materials Of Construction

Freestanding Stacks

Structural

• Carbon steel
• Cor-Ten steel
• Stainless steel
• Other materials per customer specifications

Insulation

• Per customer specifications

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Other Considerations

Installation-Ready Exhaust Systems

Draft control systems Dampers N ti Barometric draft controls Modulating draft systems Negative pressure in the building Air inlet Modulating draft systems Draft inducer fans Air inlet Clearances for the boiler Draft hoods Masonry chimney Maximum length of breeching or stack

Other Considerations

Freestanding Stacks

Duct works and breeching systems Platforms and ladders Concrete pad and footing design FAA aircraft warning system Seismic calculations Special anchoring Wind loads Lightening protection Special anchoring Lightening protection Special steel structural design

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Other Considerations

Local codes and regulations Special support requirements Chemical and ASME and CWB thermal conditions certified products Corrosion effects UL certified products Special paint requirements Needs for related products: economizer, SCR products, silencer, other

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Cleaver-Brooks Product Offering

Installation-Ready Exhaust Systems Freestanding Stacks Special Gas Vents Chimney Liners Grease Duct Products

cleaverbrooks.com/exhaustsolutions

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References

• CSA B149.1-10: Natural Gas & Propane Installation Code – Applies to the installation of

Natural Gas & Propane Appliances & Equipment- http://www.csa.ca/cm/ca/en/standards

• NFPA -

http://www.nfpa.org/categoryList.asp?categoryID=124&URL=Codes%20&%20Standards

• 211: STANDARD FOR CHIMNEYS, FIREPLACES, VENTS, AND SOLID FUEL-BURNING

NFPA 54: NATIONAL FUEL GAS CODE

• NFPA 54: NATIONAL FUEL GAS CODE
• UL- http://www.ul.com/global/eng/pages/?noredirect
• UL103: Factory built chimneys-
• UL1738: Vent or chimney connector dampers for oil fired appliances
• UL1738: Vent or chimney connector dampers for oil-fired appliances
• UL1777: Chimney liners
• ANSI Z21.86: Vented gas-fired space heating appliances- http://www.ansi.org/
• ASME STS-1 – 2011: Steel Stacks- http://www.asme.org/kb/standards
• ASHRAE- http://www.ashrae.org/standards-research--technology/standards--guidelines
• Manufacturer’s Operations and Maintenance Manuals
• Manufacturer s Operations and Maintenance Manuals

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Eric Gravel

Sales Manager egravel@ cleaverbrooks.com (450) 625-6060 clea erbrooks com/e ha stsol tions

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cleaverbrooks.com/exhaustsolutions

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