Chapter 13 — HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICAL VACUUM SYSTEMS
1327.7 Standing Pressure Tests for Oxygen and Nitrous Oxide Piping — 2025 California Plumbing Code
California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Plumbing Code (Title 24, Part 5) § 1327.7 · Effective January 1, 2026 · Official source: Building Standards Commission
Nitrous Oxide Piping. After successful completion of the initial pressure tests in Section 1327.4, the gas distribution piping shall be subject to a standing pressure test. [NFPA 99:15.4.7.4.6.1]
1327.7.1 Tests Required. 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, and hoses). [NFPA 99:15.4.7.4.6.2]
1327.7.2 Source Valve. The source valve shall be closed during this test. [NFPA 99:15.4.7.4.6.3] 1327.7.3 Piping Systems. The piping systems shall be subjected to 24-hour standing pressure tests using oilfree, dry nitrogen NF. [NFPA 99:15.4.7.4.6.4] 1327.7.4 Test Pressure. Test pressures shall be 20 percent above the normal system operating line pressure.
[NFPA 99:15.4.7.4.6.5] 1327.7.5 Change in Test Pressure. At the conclusion of the tests, there shall be no change in the test pressure except that attributed to specific changes in ambient temperature. [NFPA 99:15.4.7.4.6.6] 1327.7.6 Leaks. Any leaks shall be located, repaired (if permitted), or replaced (if required) by the installer, and retested. [NFPA 99:15.4.7.4.6.7]
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