NFPA 85 Boiler & Combustion Systems Hazards Code

Access clear information for boiler and combustion systems fire safety compliance — from design and installation to inspection — in the 2019 edition of NFPA 85.

Boiler hazards not only impact operational performance, but they can also cause explosions and jeopardize the lives of facility occupants and maintenance personnel. NFPA 85, Boiler and Combustion Systems Hazards Code, gives everyone involved with large boiler installations and pulverized fuel systems the information they need for fire safety compliance — from design and installation to inspection.

NFPA 85 presents up-to-date requirements for the full range of equipment:

• Large boilers, including atmospheric fluidized bed boilers with a minimum fuel input rating of 12.5 million Btu/hr (3.6 MW)
• Stoker operations
• Pulverized fuel systems
• Fired or unfired steam generators used to recover heat from combustion turbines

Changes reflect terminology used in today’s field, clarify code application, and facilitate code use.

• Updated and new definitions and standardized language address interlock, trip, and permissive, and correlated terms used throughout the code — such as safety interlock, interlock system, safety device, interlock device, and master fuel trip.
• New language requires specification of the autoignition temperature for fuels over the range of expected operating conditions.
• Added text clarifies the allowed uses of Class 2 and Class 3 igniters.
• Requirements for overpressure protection are now located in the Fundamentals chapter to reduce repetition. New text clarifies how to apply overpressure protection and methods to achieve it.
• Reformatted Single Burner Boiler requirements eliminate repetition and combine similar procedures used for both water-tube and fire-tube boilers.
• Clarified language states that a combustion turbine purge is not required on subsequent starts, provided purge credit is maintained.
• Clarified operational leak test frequencies state that the test does not need to be repeated if completed within eight hours.
• New annex material provides guidance on the frequency of testing for Multiple Burner Boiler interlocks.
• The Supervised Manual Systems Annex is replaced with an annex on Concentrated Flame Igniters.

Boiler or combustion system designers, operators, facility managers, and enforcers all need to stay up-to-code with NFPA 85.

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