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This Appendix addresses natural gas distribution piping requirements for systems where the gas pressure is at or above 15 psig (103.4 kPa gauge). Installations of gas piping at pressures at or above 15 psig (103.4 kPa gauge) and equipment and appliances using gas with an inlet pressure at or above 15 psig (103.4 kPa gauge) shall be considered as high pressure natural gas installations.
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