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NFPA 85: Boiler and Combustion Systems Hazards Code

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Item #: NFPA_85
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2015 NFPA 85
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In response to newly identified fire safety concerns, the 2015 NFPA 85 presents updated requirements for boiler and combustion systems.

Boiler hazards not only impact operational performance, they can cause explosions and jeopardize the lives of facility occupants and maintenance personnel. Revised for 2015, 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 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

Major changes in the 2015 edition of NFPA 85 include:

  • New requirements to facilitate safe purging of fuel gas piping in and out of service, including requiring a designated equipment isolation valve, purging upstream piping in accordance with the applicable standard, and minimum safety requirements for purging piping and equipment downstream of the equipment isolation valve.
  • Several provisions concerning multiple burner boilers (formerly in Chapter 6) were relocated to Chapter 4, General Requirements to indicate they apply to all equipment under the scope of NFPA 85. Relocated requirements include conducting a process hazard analysis for unattended operation, restrictions on removing interlocks from service during startup or operation, and preventing the flow of flue gases from a common stack into an idle boiler or Heat Recovery Steam Generator (HRSG).
  • Safety-rated programmable logic controllers are recognized in the Code for use with single-burner boilers where they are certified as at least SIL 3-capable according to IEC 61508.
  • Chapter 9, Pulverized Fuel Systems, was completely rewritten to separate requirements for direct-fired and indirect-fired systems to help users identify and apply requirements for specific equipment.

Boiler or combustion system designers, operators, facility managers, and enforcers all need to stay up-to-code with NFPA 85. (Softbound, Approx. 245 pp., 2015)

NFPA<sup>®</sup> 85 Boiler and Combustion Systems Hazards Code 2015 Edition

NFPA® 85 Boiler and Combustion Systems Hazards Code 2015 Edition

Chapter 1 Administration
1.1 Scope
1.2 Purpose
1.3 Application
1.4 Retroactivity
1.5 Equivalency
1.6 Enforcement
Chapter 2 Referenced Publications
2.1 General
2.2 NFPA Publications
2.3 Other Publications
2.4 References for Extracts in Mandatory Sections
Chapter 3 Definitions
3.1 General
3.2 NFPA Official Definitions
3.3 General Definitions
Chapter 4 Fundamentals
4.1 Manufacture, Design, and Engineering
4.2 Installation and Commissioning
4.3 Coordination of Design, Construction, and Operation
4.4 Maintenance, Inspection, Training, and Safety
4.5 Basic Operating Requirements
4.6 Structural Design
4.7 Functional Requirements of Fuel-Burning System
4.8 Multiple Boilers or HRSGs
4.9 Gaseous Vent System Requirements
4.10 Fuel System Piping
4.11 Burner Management System Logic
4.12 Flame Monitoring and Tripping Systems
4.13 Combustion Control System
4.14 Power Supplies
4.15 Operating Information
4.16 Selective Catalytic Reduction
Chapter 5 Single Burner Boilers
5.1 Application
5.2 Purpose
5.3 Unattended Operation
5.4 Equipment Requirements
5.5 Starting of a Cold Boiler
5.6 Operating Systems
5.7 Simultaneous Firing of Oil and Gas Fuels
5.8 Simultaneous Firing of Oil and Gas for Fuel Transfer Only
5.9 Dual Oil Atomizers in a Single Burner
Chapter 6 Multiple Burner Boilers
6.1 Application
6.2 Purpose
6.3 Mechanical Equipment Requirements
6.4 Burner Management and Combustion Control Requirements
6.5 Furnace Implosion Protection
6.6 Fuel Gas Systems
6.7 Fuel Oil Systems
6.8 Pulverized Coal Systems
6.9 Selective Catalytic Reduction (SCR) Systems with Bypass Capability
Chapter 7 Atmospheric Fluidized Bed Boilers
7.1 Application
7.2 Purpose
7.3 General
7.4 Equipment Requirements
7.5 Furnace Pressure Excursion Prevention
7.6 Sequence of Operations
7.7 Sequence of Operations for Gas-Fired Warm-Up Burners
7.8 Sequence of Operations for Oil-Fired Warm-Up Burners
7.9 Interlock System
7.10 Alarm System
Chapter 8 Heat Recovery Steam Generators and Other Combustion Turbine Exhaust Systems
8.1 Application
8.2 Purpose
8.3 Project Coordination
8.4 Equipment
8.5 HRSG Enclosure and Other Combustion Turbine Exhaust Systems
8.6 Electrical
8.7 Controls, Monitoring, Alarms, and Interlocks
8.8 Purge, Start-up, Operation, and Shutdown of HRSG and Other Combustion Turbine Exhaust Systems
8.9 Combustion Turbine Exhaust Bypass Systems
8.10 Combustion Turbine and HRSG with Fresh Air Firing Capability
8.11 Combustion Turbine Exhaust System
Chapter 9 Pulverized Fuel Systems
9.1 Application
9.2 Purpose
9.3 General
9.4 Direct-Fired Pulverized Fuel Systems
9.5 Indirect-Fired Pulverized Fuel Systems
9.6 Operation
9.7 Special Systems
Chapter 10 Stokers
10.1 Purpose
10.2 Fuel-Burning System
10.3 Combustion Control System
10.4 Operation
10.5 Furnace Inspection
10.6 On-Line Maintenance
10.7 Access Doors or Observation Ports
10.8 Ash Hopper Access Doors
10.9 Ash Handling
Annex A Explanatory Material
Annex B Multiple Burner Boiler Supervised Manual Systems
Annex C Multiple Burner Boiler Low NOx Operation — Special Considerations
Annex D Fluidized Bed Boilers Supplemental Information
Annex E Common Pulverized Fuel System Designs
Annex F Supplemental Information on Stoker-Fired Boilers
Annex G Sample Ordinance Adopting NFPA 85
Annex H Safety
Annex I Fuel Hazards
Annex J Origin and Development of NFPA 85
Annex K Informational References
Index