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Where air or oxygen under pressure is used in connection with the gas supply, effective means such as a backpressure regulator and relief valve shall be provided to prevent air or oxygen from passing back into the gas piping. Where oxygen is used, installation shall be in accordance with NFPA 51.

Related Code Sections

414.1 Gas Piping Installations, Use of Air or Oxygen Under Pressure
Where air or oxygen under pressure is used in connection with the gas supply, effective means such as a backpressure regulator and relief valve shall ...
414.1 Gas Piping Installations, Use of Air or Oxygen Under Pressure
Where air or oxygen under pressure is used in connection with the gas supply, effective means such as a backpressure regulator and relief valve shall ...
414.1 Gas Piping Installations, Use of Air or Oxygen Under Pressure
Where air or oxygen under pressure is used in connection with the gas supply, effective means such as a backpressure regulator and relief valve shall ...
3405.2.2 Flammable and Combustible Liquids, Pressured Systems
or container are used, the tank or container shall be a pressure vessel approved for the intended use. Air or oxygen shall not be used for pressurization ...
5705.2.2 Flammable and Combustible Liquids, Pressured Systems
or container are used, the tank or container shall be a pressure vessel approved for the intended use. Air or oxygen shall not be used for pressurization ...