NFPA 85:2023

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.
4.17 Noncombustible Material.
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 Burner Management 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 Interlocks.
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 Concentrated Flame Igniter Supplemental Information
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

(1) Single burner boilers, multiple burner boilers, stokers, and atmospheric …uidized bed boilers with a fuel input rating of 3.7 MWt (12.5 million Btu/hr) or greater (2) Pulverized fuel systems at any heat input rate (3) Fired or unƒred steam generators used to recover heat from combustion turbines [heat recovery steam genera‐ tors (HRSGs)] and other combustion turbine exhaust systems at any heat input rate 1.1.1 This code covers design, installation, operation, mainte‐ nance, and training.