1112.10 Pressure-Relief Valve Setting — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
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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) § 1112.10 · Effective January 1, 2026 · Official source: Building Standards Commission
Pressure-relief valves shall start to function at a pressure not exceeding the design pressure of the parts of the system protected.
Exception: Relief valves that discharge into other parts of the system shall comply with Section 1112.11.3. [ASHRAE 15:9.5.1]
1112.10.1 Rupture Member Setting. Rupture members used in lieu of, or in series with, a relief valve shall have a nominal rated rupture pressure not exceeding the design pressure of the parts of the system protected. The conditions of application shall comply with ASME BPVC Section VIII.1. The size of rupture members installed ahead of relief valves shall not be less than the
relief-valve inlet. [ASHRAE 15:9.5.2]
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