2021 NFPA 37 Standard - Current Edition
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  • Description

    Help ensure safe engine operation and minimize fire hazards with NFPA 37, Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines.

    Stay up-to-code with the latest changes and additions from the 2021 edition of NFPA 37, Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines. Designers, installers, and authorities having jurisdiction (AHJs) can utilize the safety requirements in this standard to reduce fire hazards during the installation and operation of stationary combustion engines and gas turbines. Requirements in NFPA 37 address system installation, fuel supplies, lubricating systems, engine exhaust systems, control and instrumentation, and fire protection features.

    Vital revisions and additions to the latest edition of NFPA 37 include the following:

    • Fire test criteria was revised to establish clearance distances for locating engines on roofs and outdoors.
    • Calculations are allowed to establish clearance distances for locating engines on roofs and outdoors.
    • Chapter 8, Engine Exhaust Systems, was reorganized and includes listings for factory-built chimneys.
    • Automatic safety shutoff valves are now required to be listed or specified by the engine or turbine manufacturer for an application.
    • A new annex on inspection, testing, and monitoring was added.
    • A new section on hybrid fire extinguishing systems was added.
    • Annex language was added clarifying that engine rooms, enclosures, or other locations are not classified based on NFPA 70®, National Electrical Code®.

    This standard is essential for loss prevention professionals; designers and installers of stationary engines for fire pumps, standby power supplies, and emergency generators; insurers; and AHJs to help improve safe engine operation and minimize fire hazards.

    Order NFPA 37, Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, today to enhance fire safety and stay informed on the latest requirements in the safe operation and installation of these types of engines and turbines. (Print, 40 pp., 2021)

  • Table of Contents (2021) Current Edition)

    NFPA® 37 Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, 2021 Edition

    Chapter 1 Administration
    1.1 Scope.
    1.2 Purpose.
    1.3 Application.
    1.4 Retroactivity.
    1.5 Equivalency.
    1.6 Units and Formulas.
    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 Engines — General Requirements
    4.1 Engine Locations.
    4.2 Support of Engines.
    4.3 Hazardous Locations.
    4.4 Engines Handling Hazardous Materials (Other Than Their Own Fuel Supply).
    4.5 Electrical Installations.
    4.6 General Installation Requirements.
    Chapter 5 Fuel Supply — Gaseous
    5.1 Gas Piping.
    5.2 Gas Trains.
    5.3 Regulators.
    5.4 Valves.
    5.5 Pressure-Boosting Equipment.
    5.6 Overpressure Protection.
    Chapter 6 Fuel Supply — Liquid
    6.1 Design and Construction of Liquid Fuel Tanks.
    6.2 Installation Criteria for Fuel Tanks Containing Class I Fuels.
    6.3 Installation Criteria for Fuel Tanks Containing Liquid Fuels Other Than Class I Fuels.
    6.4 Installation Criteria for Fuel Tanks Containing Liquefied Petroleum Gases.
    6.5 Fuel Flow Control.
    6.6 Filling.
    6.7 Vent Piping.
    6.8 Fuel Piping, Valves, and Fittings.
    6.9 Transfer of Liquid Fuel to Engines.
    Chapter 7 Lubricating Systems
    7.1 General Requirements.
    7.2 Combustion Gas Turbines.
    7.3 Lubricating Oil Piping.
    7.4 Reciprocating Engines.
    7.5 Safeguards for Gauging Devices.
    Chapter 8 Engine Exhaust Systems
    8.1 Design and Construction.
    8.2 Installation.
    8.3 Clearance from Exhaust Systems with Exhaust Gas Temperatures of Less Than 760°C (1400°F).
    8.4 Clearance from Exhaust Systems with Exhaust Gas Temperatures of 760°C (1400°F) or Greater.
    Chapter 9 Control and Instrumentation
    9.1 All Engines.
    9.2 Reciprocating Engines.
    9.3 Combustion Gas Turbines.
    Chapter 10 Instructions
    10.1 Operating Instructions.
    10.2 Emergency Instructions.
    10.3 Training.
    Chapter 11 Fire Protection Features
    11.1 General.
    11.2 Portable Fire Extinguishers.
    11.3 Fire Detection and Alarm Systems.
    11.4 Fire Suppression Systems and Equipment.
    Annex A Explanatory Material
    Annex B Inspection, Maintenance, and Testing
    Annex C Informational References
  • Prior Editions

    2018 Editon

    Safe engine operation requires compliance with NFPA 37, Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines.

    Minimize fire hazards by staying up-to-code. The 2018 edition of NFPA 37 governs the installation and use of stationary engines and gas turbines fueled by liquid or gaseous fuels as prime movers for emergency generators, fire pumps, and stand-by and peak power systems. Requirements address system installation, fuel supplies, lubricating systems, engine exhaust systems, control and instrumentation, instructions, and fire protection features.

    Designers, installers, and AHJs will work more efficiently and confidently with the latest provisions, including key changes:

    • New definitions cover the terms inlet gas pressure, line pressure regulator, overpressure protection device, rated pressure, and service regulator.
    • A new requirement mandates investigation of any situation that results in a trip of the high-pressure limit control prior to manual reset.
    • The allowable operating time for automatic safety shutoff valves (ASSVs) has been changed from 1 second to 2 seconds, to be consistent with ANSI Z21.21, Automatic Valves for Gas Appliances.
    • The section on Overpressure Protection is revised to provide for protection for gas trains that operate between 2 psi and 125 psi, which are not addressed in NFPA 54, National Fuel Gas Code (ANSI Z223.1)
    • Subsection 4.1.3, Engines Located on Roofs, has been revised to clarify the provisions related to the proximity of engines and weatherproof enclosures to combustible construction.
    • A new subsection and detailed related annex material address proper anchoring of flexible connectors.
    • Annex text is revised to address the concerns of products of combustion, particularly carbon monoxide, from the exhaust of stationary engines.
    • Annex text to Paragraph 5.3.1.2 has been replaced with an extensive discussion of "lock-up" of pressure regulators, as addressed in ANSI Z21.80, Line Pressure Regulators.

    Loss prevention professionals; designers and installers of stationary engines for fire pumps, standby power supplies, and emergency generators; insurers; and AHJs need the 2018 edition of NFPA 37 to help improve safe engine operation and minimize fire hazards. (Print, 36 pp., 2018)


    2015 Editon

    Update to the 2015 edition of NFPA 37, Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines for the latest on safe engine operation.

    Minimize fire hazards by staying up-to-code. The 2015 edition of NFPA 37 governs the installation and use of stationary engines and gas turbines fueled by liquid or gaseous fuels as prime movers for emergency generators, fire pumps, and stand-by and peak power systems. Requirements address system installation, fuel supplies, lubricating systems, engine exhaust systems, control and instrumentation, instructions, and fire protection features.

    Designers, installers, and AHJs will work more efficiently and confidently with the latest provisions, including key changes:

    • General installation requirements for engines and turbines are revised to require compliance with wind and seismic design criteria.
    • Subsection 5.2.1 is amended to specify the type of regulator required and other changes that enhance the safety of the fuel supply system.
    • Revision in Subsection 5.2.2 allows the use of a proof-of-closure switch or a valve proving system as alternatives to a vent valve between the two automatic safety shutoff valves -- providing greater flexibility for system designers.
    • New Subsection 9.3.3 reinstates the vital requirement for a purge cycle in the start cycle for combustion gas turbines.
    • Paragraphs 11.4.4.1.1 and 11.4.4.2 are revised to clarify the performance criteria for total flooding gaseous agent suppression systems and local application gaseous agent suppression systems with respect to cool-down of the engine or turbine.
    • Annexes to both paragraphs above are revised to incorporate additional clarification and a new Subsection 11.4.8 has been added to address retrofit of existing fire suppression systems. These amendments help the user ensure that suppression systems will perform as intended.

    Loss prevention professionals; designers and installers of stationary engines for fire pumps, standby power supplies, and emergency generators; insurers; and AHJs need the 2015 edition of NFPA 37 to help improve safe engine operation and minimize fire hazards. (Softbound, 35 pp., 2015)

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