Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems
What is NFPA 56?
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.