Hydrostatic Test Pressure and Hold

Test pressure (1.5x water / 1.25x gas) and recommended hold time.

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Formula and source

Test pressure: 1.5× working pressure for water systems (IPC 2021 Section 312), 1.25× for fuel-gas systems (IFGC 2021 Section 406.4); recommended hold time scales with system volume.

IPC 2021 (International Plumbing Code). Section 312; IFGC 2021 (International Fuel Gas Code) / NFPA 54. Section 406.4.

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