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The minimum required test pressure for gas piping systems is generally set at 3 PSIg. This standard is established to ensure the safety and integrity of the piping systems, allowing for the detection of leaks that could pose risks associated with gas transportation. The 3 PSIg test pressure is also a common baseline that many regulatory standards adopt for verifying the performance of gas piping installations.

This level of pressure ensures that the material used in the piping and fittings can withstand operating conditions, and it helps to identify any weaknesses in the system before it goes into actual service. Higher pressure tests could be conducted for specific applications, but 3 PSIg serves as the minimum to ensure compliance and safety in most scenarios.