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NFPA 85 2023

NFPA 85 2023

$80.71

NFPA 85: Boiler and Combustion Systems Hazards Code

Published By Publication Date Number of Pages
NFPA 2023 241
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Improve building fire and life safety and help ensure compliance by referencing the latest requirements for boiler and combustion systems. NFPA® 85, Boiler and Combustion Systems Hazards Code, is a critical resource to help minimize risks and prevent explosions and implosions in boilers, pulverizing fuel systems, and heat recovery steam generators. From design, installation, and inspection criteria to coverage of the full range of equipment and systems, the revised and expanded 2023 edition offers the most current information. Significant changes include: Addition of new requirements, expanded and clarified existing language, and defined terms Added requirements in Chapter 4 and in the annex that prescribe a written commissioning plan for all new and retrofitted boilers Updated requirements for signage and procedures, along with any necessary personal protective equipment to reduce the risk of injury, for observation ports that open into enclosures Introduction of an alternative to the current vent sizing where the potential leakage of the upstream valve is known and a valve-proving system is in use Revised definition for noncombustible material for consistency with other NFPA documents Changes to the safety integrity level (SIL) for single burner boilers in Chapter 5 from SIL 3 to SIL 2 to ensure that the programmable logic controller (PLC) and input/output (I/O) modules are certified by an independent organization and not the manufacturer New SIL requirements clarify that the burner management system logic is implemented in the safety area of the processor and not with the control system in the general-purpose area of the processor Expanded multiple burner boiler requirements in Chapter 6 for interlock functional tests and new annex material that outlines the intent and goals of the test Revised starting sequence for multiple burner boilers to specify that the trial timer begins when the individual igniter safety shutoff valve(s) is energized and not when proven open Change from the nomenclature leak test to the fuel gas header system tightness test to better reflect the requirement to ensure the main safety shutoff valve and upstream individual burner safety shutoff valves are not leaking. (The multiple burner boiler annex material for this test has been rewritten to better contextualize the requirements for the user.) Revised starting sequence for multiple burner boilers throughout Chapter 6 to reflect that overfire air is in service before the boiler is operating Minimum safety requirements and informational text added in Chapter 8 and its associated annex material to more accurately describe the conditions under which a turbine/ heat recovery steam generator (HRSG) system can achieve combustion turbine purge credit The term coal replaced with fuel throughout Chapter 9 since the specific type of raw fuel being used is not necessarily coal

PDF Catalog

PDF Pages PDF Title
18 Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Application.
19 1.4 Retroactivity.
1.5 Equivalency.
1.6 Enforcement.
Chapter 2 Referenced Publications
2.1 General.
2.2 NFPA Publications.
2.3 Other Publications.
20 2.4 References for Extracts in Mandatory Sections.
Chapter 3 Definitions
3.1 General.
3.2 NFPA Official Definitions.
3.3 General Definitions.
26 Chapter 4 Fundamentals
4.1 Manufacture, Design, and Engineering.
4.2 Installation and Commissioning.
27 4.3 Coordination of Design, Construction, and Operation.
4.4 Maintenance, Inspection, Training, and Safety.
28 4.5 Basic Operating Requirements.
4.6 Structural Design.
4.7 Functional Requirements of Fuel-Burning System.
29 4.8 Multiple Boilers or HRSGs.
30 4.9 Gaseous Vent System Requirements.
4.10 Fuel System Piping.
31 4.11 Burner Management System Logic.
32 4.12 Flame Monitoring and Tripping Systems.
33 4.13 Combustion Control System.
4.14 Power Supplies.
4.15 Operating Information.
34 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.
37 5.5 Starting of a Cold Boiler.
38 5.6 Burner Management Systems.
40 5.7 Simultaneous Firing of Oil and Gas Fuels.
42 5.8 Simultaneous Firing of Oil and Gas for Fuel Transfer Only.
44 5.9 Dual Oil Atomizers in a Single Burner.
45 Chapter 6 Multiple Burner Boilers
6.1 Application.
6.2 Purpose.
6.3 Mechanical Equipment Requirements.
6.4 Burner Management and Combustion Control Requirements.
54 6.5 Furnace Implosion Protection.
56 6.6 Fuel Gas Systems.
65 6.7 Fuel Oil Systems.
74 6.8 Pulverized Coal Systems.
83 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.
84 7.4 Equipment Requirements.
90 7.5 Furnace Pressure Excursion Prevention.
92 7.6 Sequence of Operations.
97 7.7 Sequence of Operations for Gas-Fired Warm-Up Burners.
102 7.8 Sequence of Operations for Oil-Fired Warm-Up Burners.
110 7.9 Interlocks.
116 7.10 Alarm System.
118 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.
121 8.5 HRSG Enclosure and Other Combustion Turbine Exhaust Systems.
122 8.6 Electrical.
8.7 Controls, Monitoring, Alarms, and Interlocks.
124 8.8 Purge, Start-up, Operation, and Shutdown of HRSG and Other Combustion Turbine Exhaust Systems.
130 8.9 Combustion Turbine Exhaust Bypass Systems.
132 8.10 Combustion Turbine and HRSG with Fresh Air Firing Capability.
133 8.11 Combustion Turbine Exhaust System.
Chapter 9 Pulverized Fuel Systems
9.1 Application.
9.2 Purpose.
9.3 General.
134 9.4 Direct-Fired Pulverized Fuel Systems.
139 9.5 Indirect-Fired Pulverized Fuel Systems.
143 9.6 Operation.
145 9.7 Special Systems.
150 Chapter 10 Stokers
10.1 Purpose.
10.2 Fuel-Burning System.
151 10.3 Combustion Control System.
10.4 Operation.
153 10.5 Furnace Inspection.
10.6 On-Line Maintenance.
10.7 Access Doors or Observation Ports.
154 10.8 Ash Hopper Access Doors.
10.9 Ash Handling.
Annex A Explanatory Material
195 Annex B Concentrated Flame Igniter Supplemental Information
197 Annex C Multiple Burner Boiler Low NOx Operation — Special Considerations
198 Annex D Fluidized Bed Boilers Supplemental Information
202 Annex E Common Pulverized Fuel System Designs
211 Annex F Supplemental Information on Stoker-Fired Boilers
218 Annex G Sample Ordinance Adopting NFPA 85
219 Annex H Safety
220 Annex I Fuel Hazards
223 Annex J Origin and Development of NFPA 85

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