1109.1 Materials — 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) § 1109.1 · Effective January 1, 2026 · Official source: Building Standards Commission
Materials used in the construction and installation of refrigerating systems shall be suitable for conveying the refrigerant used. Materials shall not be used that will deteriorate because of the refrigerant, the lubricant, or their combination in the presence of air or moisture to a degree that poses a safety hazard. [ASHRAE 15:9.1.1] Refrigerant piping shall be metallic. Materials for refrigerant piping, tubing, and fittings shall comply with the applicable standards in Table 1109.1.
REFRIGERATION
For SI Units: 1 pound = 0.453 kg, 1 cubic foot per minute = 0.47194 L/s, 1 pound-force per square inch = 6.8947 kPa
FIGURE 1106.11.11.4
LEVEL 2 VENTILATION RATE FOR CLASS 2L REFRIGERANTS
[ASHRAE 15: FIGURE 8-1]
238 2025 CALIFORNIA MECHANICAL CODE
REFRIGERATION
TABLE 1109.1 MATERIALS FOR REFRIGERANT PIPING,
| TUBING, AND FITTINGS | ||
|---|---|---|
MATERIAL |
STANDARDS | STANDARDS |
MATERIAL |
PIPING/TUBING | FITTINGS |
Aluminum |
ASTM B210, ASTM B491 | ASTM B361 |
Copper/ alloy |
ASTM B42, ASTM B43, ASTM B68, ASTM B75, ASTM B88, ASTM B280, ASTM B302, ASTM B819, ASTM B1003 |
ASME B16.15, ASME B16.18, ASME B16.22, ASME B16.24, ASME B16.26, ASME B16.50 |
Steel |
ASTM A53, ASTM A106, ASTM A254, ASTM A333, ASTM A334 |
ASTM A105, ASTM A181, ASTM A193, ASTM A234, ASTM A420, ASTM A707 |
1109.1.1 Copper and Copper Alloy Pipe. Copper and copper alloy refrigeration piping, valves, fittings, and related parts used in the construction and installation of refrigeration systems shall be approved for the intended use. Refrigeration piping shall comply with ASME B31.5.
1109.1.2 Copper Linesets. Copper linesets shall comply with ASTM B280 or ASTM B1003.
1109.1.3 Iron and Steel. Iron and steel refrigeration piping, valves, fittings, and related parts shall be approved for the intended use. Pipe exceeding 2 inches (50 mm) iron pipe size shall be electric-resistance welded or seamless pipe. Refrigeration piping shall comply with ASME B31.5.
1109.1.4 Prohibited Contact. Aluminum, zinc, magnesium, or their alloys shall not be used in contact with methyl chloride. Magnesium alloys shall not be used in contact with any halogenated refrigerants. [ASHRAE 15:9.1.2]
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