After successful completion of the initial pressure tests under Section 1318.5 through Section 1318.5.3, medical gas distribution piping shall be subjected to a standing pressure test. [NFPA 99:5.1.12.2.6]
Tests shall be conducted after the final installation of station outlet valve bodies, faceplates, and other distribution system components (e.g. pressure alarm devices, pressure indicators, line pressure relief valves, manufactured assemblies, hose). [NFPA 99:5.1.12:2.6.1]
The source valve shall be closed during this test. [NFPA 99:5.1.12.2.6.2]
The piping systems shall be subjected to a 24 hour standing pressure test using oil-free, dry nitrogen NF. [NFPA 99:5.1.12.2.6.3]
Test pressures shall be 20 percent above the normal system operating line pressure. [NFPA 99:5.1.12.2.6.4]
At the conclusion of the tests, there shall be no change in the test pressure except that attributed to specific changes of ambient temperature. [NFPA 99:5.1.12.2.6.5]
Leaks, if any, shall be located, repaired (if permitted), or replaced (if required), and retested. [NFPA 99:5.1.12.2.6.6]
The 24 hour standing pressure test of the positive pressure system shall be witnessed by the Authority Having Jurisdiction or its designee. A form indicating that this test has been performed and witnessed shall be provided to the verifier at the start of the tests required in Section 1318.16. [NFPA 99:5.1.12.2.6.7]