NFPA 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems
Current Edition: 2014 Next Edition: 2017

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NFPA 56:
2014 Edition
Item #: 5614
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What is NFPA 56?
NFPA 56: Document Scope
1.1 Scope. 1.1.1* Applicability. This standard shall apply to fire and explosion prevention during cleaning and purging activities for new and existing flammable gas piping found in electric generating plants and in industrial, institutional, and commercial applications. 1.1.1.1* Coverage of piping systems shall extend from the point of delivery to the gas-consuming equipment isolation valve. 1.1.1.1.1 For other than undiluted liquefied petroleum gas (LP-Gas) systems, the point of delivery is the outlet of the customer meter or at the connection to a customer’s piping, whichever is farther downstream, or if there is no meter at the connection to customer piping. 1.1.1.1.2 For undiluted LP-Gas, the point of delivery is the outlet of the final pressure regulator, exclusive of line gas regulators, in the system. 1.1.1.1.3 For facilities that produce flammable gas for consumption on site, the point of delivery is the discharge isolation valve for the gas-producing equipment. 1.1.2 Nonapplication of Standard. This standard shall not apply to the following items: (1)*Piping systems covered by NFPA 2 (2)*Piping systems covered by NFPA 54 (3)*Piping systems covered by NFPA 58 (4)*LP-Gas (including refrigerated storage) at utility gas plants (see NFPA 59) (5)*LNG facilities covered by NFPA 59A (6) LP-Gas used with oxygen for cutting, welding, or other hot work (7)*Vehicle fuel dispensers (8) Commissioning and maintenance of appliances or equipment (9) Vent lines from pressure relief valves (10) Systems regulated by U.S. Department of Transportation (DOT) 49 CFR 191 and 192 1.2* Purpose. This standard provides minimum safety requirements for the cleaning and purging of flammable gas piping systems, including cleaning new or existing piping systems, purging piping systems into service, and purging piping systems out of service. 1.2.1 For the purposes of this document, a piping system shall be understood to mean a complete piping system, including valves, regulators, and other appurtenances, and any segment thereof that can be isolated from the system. 1.3 Retroactivity. The provisions of this standard reflect a consensus of what is necessary to provide an acceptable degree of protection from the hazards addressed in this standard at the time the standard was issued. 1.3.1 Unless otherwise specified, the provisions of this standard shall apply to facilities, equipment, structures, or installations that existed or were approved for construction or installation prior to the effective date of the standard. 1.3.2 The retroactive requirements of this standard shall be permitted to be modified if their application clearly would be impractical in the judgment of the authority having jurisdiction and only where it is clearly evident that a reasonable degree of safety is provided. 1.4 Equivalency. The provisions of this code are not intended to prevent the use of systems, methods, or devices of equivalent or superior quality, strength, fire resistance, effectiveness, durability, and safety over those prescribed by this standard. 1.4.1 Technical documentation shall be submitted to the authority having jurisdiction to demonstrate equivalency. 1.4.2 The system, method, or device shall be approved for the intended purpose by the authority having jurisdiction.
This standard provides minimum safety requirements for the cleaning and purging procedures of flammable gas piping systems, including cleaning new or existing piping systems, purging piping systems into service, and purging piping systems out of service. Official document scope
What does NFPA 56 address?
Provisions apply to all flammable gas piping systems, including those in electric-generating plants, refineries, petrochemical plants, and other commercial and industrial applications. Coverage of piping systems extends from the point of delivery to the equipment shutoff valve, including all valves, regulators, and other appurtenances.

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