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3509.8 Piped natural gas precautions.
When piped natural gas is used with oxygen in any hot work operation, a listed protective device that serves as a combination flashback arrester and backflow check valve shall be provided at an approved location on both the natural gas and oxygen supply lines so as to ensure the safe operation of all devices, equipment and systems, including the utility gas meter. Where pressure of the piped natural gas supply is insufficient to ensure such safe operation, approved equipment shall be provided between the gas meter and the fuel-consuming appliance that increases such pressure to the level required for such safe operation. Notwithstanding any section of this code to the contrary, such flashback arresters and check valves, pressure-increasing equipment, shall be installed as components of both new and existing installations. Installations involving the use of piped natural gas with oxygen in any hot work operation shall additionally comply with the rules.
Section FC 3510: Hot Work on Flammable and Combustible Liquid Storage Tanks
3510.1 General.
Hot work performed on the interior or exterior of tanks that hold or have held flammable or combustible liquids, when approved, shall be conducted in accordance with this section and NFPA 326.

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