Which standard applies to CPVC Schedule 80 fittings?

• A. ASTM F 437
• B. ASTM F 438
• C. ASME B16.11
• D. ASTM F 439

Answer: (D)

CPVC Schedule 80 fittings are governed by the CPVC fittings standard, which is ASTM F439. This standard is written specifically for CPVC plastic pipe fittings used with CPVC piping systems in pressure service, including the types and sizes used in sprinkler systems. It defines what materials and fittings are acceptable, how they connect (such as solvent-weld or threaded configurations), acceptable tolerances, and pressure ratings to ensure reliable performance with CPVC pipe.

ASME B16.11 applies to metal forged fittings, so it isn’t the right fit for CPVC piping. The other CPVC-related standards exist, but ASTM F439 is the one that directly covers CPVC pressure fittings like those used in Schedule 80, making it the appropriate reference.