Critical collapse pressure ratings of Harvel PVC and CPVC piping in PSI and inches of water

Critical Collapse Pressure Ratings of Harvel PVC and CPVC Pipe (PSI and Inches of water)

Based @ 73°F With No Safety Factor

Appropriate temperature derating factors must be applied for the material selected when working at temperature greater than 73°F.

Critical Collapse Pressure is the maximum allowable pressure that can be applied externally to pipe, and is directly related to the wall thickness of the pipe selected.

Examples of external pressure conditions can occur: when buried pipe is subjected to soil loads; underwater applications; vacuum service; and pipe installed on suction lines. The actual external load being applied to the pipe is the difference between the external pressure and the internal pressure which counteracts each other. As a result, a pressurized pipe can withstand a greater external load than an empty pipe.

Harvel Plastic, Inc recommends the use of Solvent-cemented connections when using PVC/CPVC pipe in vacuum service applications. Threaded connections are not recommended due to the greater potential for leakage when used in negative pressure applications. 1 PSI = 2.036 inches of mercury

Appropriate temperature de-rating factors must be applied at temperatures other than 73 ° F based on the material selected.

Multiply the collapse pressure of the selected pipe at 73° F, by the appropriate de-rating factor to determine the collapse pressure rating of the pipe at the elevated temperature chosen.