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The minimum test pressure required for newly installed gas piping is established to ensure the integrity and safety of the system. A test pressure of 3 psig is sufficient to detect leaks and ensure that the piping can handle the pressures it will encounter during normal operation. This standard is crucial because it allows for a safety margin above typical operating pressures, ensuring that the system is leak-free before it is put into service.

Piping systems are tested to confirm that there are no leaks within the newly installed segments, and a test pressure that meets or exceeds 3 psig helps ensure that any potential issues can be identified before the system is operational. Using a pressure above the established minimum helps in the detection of smaller leaks that may not be noticeable at lower pressures.