NFPA 56: 2012 Provisional Standard for the Commissioning and Maintenance of Flammable Gas Piping Systems

National Fire Protection Association (NFPA). 2012. 15 p. This standard applies to commissioning and maintenance procedures for flammable gas piping found in electric-generating plant, industrial and commercial applications.
Coverage of piping systems shall extend from the point of delivery to the gas-consuming equipment isolation valve