What is the gas pressure test requirement for existing piping?

What is the gas pressure test requirement for existing piping?

• A. 3 psi for 10 minutes
• B. 2 psi for 30 minutes
• C. 1 1/2 psi for 10 minutes
• D. 1 psi for 15 minutes

Answer: (C)

Testing existing gas piping focuses on confirming there are no leaks after work by applying a controlled pressure and watching for any loss over time. For piping that’s already in place, the standard calls for a test at 1 1/2 psi gauge held for 10 minutes. This level is high enough to reveal leaks without unduly stressing older lines, fittings, or joints. To perform it, isolate the section under test, apply the 1.5 psi pressure with a reliable gauge, and observe for the full 10 minutes. If the pressure stays steady, the piping passes the test. If it drops, leaks are present and must be found and repaired before the system is put back into service. This approach contrasts with tests used for new piping, which typically involve higher pressures and sometimes longer durations to ensure the new installation can handle the load.

Testing existing gas piping focuses on confirming there are no leaks after work by applying a controlled pressure and watching for any loss over time. For piping that’s already in place, the standard calls for a test at 1 1/2 psi gauge held for 10 minutes. This level is high enough to reveal leaks without unduly stressing older lines, fittings, or joints.

To perform it, isolate the section under test, apply the 1.5 psi pressure with a reliable gauge, and observe for the full 10 minutes. If the pressure stays steady, the piping passes the test. If it drops, leaks are present and must be found and repaired before the system is put back into service.

This approach contrasts with tests used for new piping, which typically involve higher pressures and sometimes longer durations to ensure the new installation can handle the load.