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NFPA 85
Boiler and Combustion Systems Hazards Code - Effective Date: 1/3/2011
Organization:
NFPA - (NFPA) - National Fluid Power Association
Year: 2011
Abstract: This code applies to the following:
(1) Single burner boilers, multiple burner boilers, stokers, and atmospheric fluidized 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 unfired steam generators used to recover heat from combustion turbines [heat recovery steam generators (HRSGs)] and other combustion turbine exhaust systems at any heat input rate
This code covers design, installation, operation, maintenance, and training.
This code covers strength of the structure, operation and maintenance procedures, combustion and draft control equipment, safety interlocks, alarms, trips, and other related controls that are essential to safe equipment operation.
This code does not cover process heaters used in chemical and petroleum manufacture in which steam generation is incidental to the operation of a processing system.
Chapter 5 covers single burner boilers that fire the following fuels:
(1) Fuel gas as defined in 3.3.74.
(2)*Other gas having a calorific value and characteristics similar to natural gas
(3) Fuel oil as defined in 3.3.73.3
(4) Fuel gas and fuel oil that are fired simultaneously for fuel transfer
(5) Fuel gas and fuel oil that are fired simultaneously and continuously
Chapter 6 covers multiple burner boilers firing one or more of the following:
(1) Fuel gas, as defined in 3.3.74
(2) Fuel oil, as defined in 3.3.73.3
(3) Pulverized coal, as defined in 3.3.73.2.1
(4) Simultaneous firing of more than one of the fuels stated in 1.1.5 (1) through 1.1.5(3)
Chapter 7 covers atmospheric fluidized bed boilers.
Chapter 8 covers HRSG systems and other combustion turbine exhaust systems.
Chapter 9 covers pulverized fuel systems, beginning with the raw fuel bunker, which is upstream of the pulverizer and is the point at which primary air enters the pulverizing system, and terminating at the point where pressure can be relieved by fuel being burned or collected in a device that is built in accordance with this code. The pulverized fuel system shall include the primary air ducts, which are upstream of the pulverizer, to a point where pressure can be relieved.
Chapter 10 covers boilers that use a stoker to fire the following fuels:
(1) Coal
(2) Wood
(3) Refuse-derived fuel (RDF)
(4) Municipal solid waste (MSW)
(5) Other solid fuels
Where solid fuel is fired simultaneously with other fuels (e.g., a solid fuel stoker fired in combination with fuel gas, fuel oil, or pulverized auxiliary fuel), additional controls and interlocks shall include those covered in Chapters 5, 6, and 9.
Exception No. 1: The purge requirements of Chapters 5 and 6 shall not be required when the stoker is firing and the boiler is on-line. In those cases, if no cooling air is being provided to the auxiliary burners, a purge of their associated air supply ducts shall be provided.
Exception No. 2: Where fuel oil or fuel gas is fired in a supervised manual system in accordance with Chapter 5, the excessive steam pressure interlock shall not be required.
Purpose.
The purpose of this code is to contribute to operating safety and to prevent uncontrolled fires, explosions, and implosions in equipment described in Section 1.1.
This code establishes minimum requirements for design, installation, operation, training, and maintenance.
(1) Single burner boilers, multiple burner boilers, stokers, and atmospheric fluidized 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 unfired steam generators used to recover heat from combustion turbines [heat recovery steam generators (HRSGs)] and other combustion turbine exhaust systems at any heat input rate
This code covers design, installation, operation, maintenance, and training.
This code covers strength of the structure, operation and maintenance procedures, combustion and draft control equipment, safety interlocks, alarms, trips, and other related controls that are essential to safe equipment operation.
This code does not cover process heaters used in chemical and petroleum manufacture in which steam generation is incidental to the operation of a processing system.
Chapter 5 covers single burner boilers that fire the following fuels:
(1) Fuel gas as defined in 3.3.74.
(2)*Other gas having a calorific value and characteristics similar to natural gas
(3) Fuel oil as defined in 3.3.73.3
(4) Fuel gas and fuel oil that are fired simultaneously for fuel transfer
(5) Fuel gas and fuel oil that are fired simultaneously and continuously
Chapter 6 covers multiple burner boilers firing one or more of the following:
(1) Fuel gas, as defined in 3.3.74
(2) Fuel oil, as defined in 3.3.73.3
(3) Pulverized coal, as defined in 3.3.73.2.1
(4) Simultaneous firing of more than one of the fuels stated in 1.1.5 (1) through 1.1.5(3)
Chapter 7 covers atmospheric fluidized bed boilers.
Chapter 8 covers HRSG systems and other combustion turbine exhaust systems.
Chapter 9 covers pulverized fuel systems, beginning with the raw fuel bunker, which is upstream of the pulverizer and is the point at which primary air enters the pulverizing system, and terminating at the point where pressure can be relieved by fuel being burned or collected in a device that is built in accordance with this code. The pulverized fuel system shall include the primary air ducts, which are upstream of the pulverizer, to a point where pressure can be relieved.
Chapter 10 covers boilers that use a stoker to fire the following fuels:
(1) Coal
(2) Wood
(3) Refuse-derived fuel (RDF)
(4) Municipal solid waste (MSW)
(5) Other solid fuels
Where solid fuel is fired simultaneously with other fuels (e.g., a solid fuel stoker fired in combination with fuel gas, fuel oil, or pulverized auxiliary fuel), additional controls and interlocks shall include those covered in Chapters 5, 6, and 9.
Exception No. 1: The purge requirements of Chapters 5 and 6 shall not be required when the stoker is firing and the boiler is on-line. In those cases, if no cooling air is being provided to the auxiliary burners, a purge of their associated air supply ducts shall be provided.
Exception No. 2: Where fuel oil or fuel gas is fired in a supervised manual system in accordance with Chapter 5, the excessive steam pressure interlock shall not be required.
Purpose.
The purpose of this code is to contribute to operating safety and to prevent uncontrolled fires, explosions, and implosions in equipment described in Section 1.1.
This code establishes minimum requirements for design, installation, operation, training, and maintenance.
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| contributor author | NFPA - (NFPA) - National Fluid Power Association | |
| date accessioned | 2017-09-04T16:54:00Z | |
| date available | 2017-09-04T16:54:00Z | |
| date copyright | 01/01/2011 | |
| date issued | 2011 | |
| identifier other | WXGDRDAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/117442 | |
| description abstract | This code applies to the following: (1) Single burner boilers, multiple burner boilers, stokers, and atmospheric fluidized 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 unfired steam generators used to recover heat from combustion turbines [heat recovery steam generators (HRSGs)] and other combustion turbine exhaust systems at any heat input rate This code covers design, installation, operation, maintenance, and training. This code covers strength of the structure, operation and maintenance procedures, combustion and draft control equipment, safety interlocks, alarms, trips, and other related controls that are essential to safe equipment operation. This code does not cover process heaters used in chemical and petroleum manufacture in which steam generation is incidental to the operation of a processing system. Chapter 5 covers single burner boilers that fire the following fuels: (1) Fuel gas as defined in 3.3.74. (2)*Other gas having a calorific value and characteristics similar to natural gas (3) Fuel oil as defined in 3.3.73.3 (4) Fuel gas and fuel oil that are fired simultaneously for fuel transfer (5) Fuel gas and fuel oil that are fired simultaneously and continuously Chapter 6 covers multiple burner boilers firing one or more of the following: (1) Fuel gas, as defined in 3.3.74 (2) Fuel oil, as defined in 3.3.73.3 (3) Pulverized coal, as defined in 3.3.73.2.1 (4) Simultaneous firing of more than one of the fuels stated in 1.1.5 (1) through 1.1.5(3) Chapter 7 covers atmospheric fluidized bed boilers. Chapter 8 covers HRSG systems and other combustion turbine exhaust systems. Chapter 9 covers pulverized fuel systems, beginning with the raw fuel bunker, which is upstream of the pulverizer and is the point at which primary air enters the pulverizing system, and terminating at the point where pressure can be relieved by fuel being burned or collected in a device that is built in accordance with this code. The pulverized fuel system shall include the primary air ducts, which are upstream of the pulverizer, to a point where pressure can be relieved. Chapter 10 covers boilers that use a stoker to fire the following fuels: (1) Coal (2) Wood (3) Refuse-derived fuel (RDF) (4) Municipal solid waste (MSW) (5) Other solid fuels Where solid fuel is fired simultaneously with other fuels (e.g., a solid fuel stoker fired in combination with fuel gas, fuel oil, or pulverized auxiliary fuel), additional controls and interlocks shall include those covered in Chapters 5, 6, and 9. Exception No. 1: The purge requirements of Chapters 5 and 6 shall not be required when the stoker is firing and the boiler is on-line. In those cases, if no cooling air is being provided to the auxiliary burners, a purge of their associated air supply ducts shall be provided. Exception No. 2: Where fuel oil or fuel gas is fired in a supervised manual system in accordance with Chapter 5, the excessive steam pressure interlock shall not be required. Purpose. The purpose of this code is to contribute to operating safety and to prevent uncontrolled fires, explosions, and implosions in equipment described in Section 1.1. This code establishes minimum requirements for design, installation, operation, training, and maintenance. | |
| language | English | |
| title | NFPA 85 | num |
| title | Boiler and Combustion Systems Hazards Code - Effective Date: 1/3/2011 | en |
| type | standard | |
| page | 241 | |
| status | Active | |
| tree | NFPA - (NFPA) - National Fluid Power Association:;2011 | |
| contenttype | fulltext |