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Sub-atmospheric pressure gas systems (SAGS) shall be in accordance with NFPA 318.

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A.3.3 (IFGS) Sizing and Capacities of Gas Piping, Hybrid Pressure Method
The sizing of a 2 psi (13.8 kPa) gas piping system is performed using the traditional Longest Length Method but with modifications. The 2 psi (13.8 ...