904.7 Steam Safety and Pressure Relief Valves — 2025 California Mechanical Code

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · 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 Mechanical Code (Title 24, Part 4) § 904.7 · Effective January 1, 2026 · Official source: Building Standards Commission

Steam and hot water boilers shall be equipped, respectively, with listed or approved steam safety or pressure relief valves of appropriate discharge capacity and conforming with ASME requirements. A shutoff valve shall not be placed between the relief valve and the boiler or on discharge pipes between such valves and the atmosphere. [NFPA 54:10.3.7]

904.7.1 Discharge. Relief valves shall be piped to discharge near the floor. [NFPA 54:10.3.7.1]

904.7.2 Size. The entire discharged piping shall be at least the same size as the relief valve discharge piping.

[NFPA 54:10.3.7.2]

904.7.3 End Connections. Discharge piping shall not contain threaded end connection at its termination point.

[NFPA 54:10.3.7.3]

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▸Contents — California Mechanical Code (Title 24, Part 4)

California Mechanical Code (Title 24, Part 4)

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