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.
SCH40 PVC/CPVC Pipe
Pipe Size PSI Inches of water
2” 316 8746
2-1/2” 451 12483
3” 307 8497
4” 190 5259
6” 90 2491
8” 58 1605
10” 49 1605
12” 42 1162
18” 33 9013
20” 28 775
24” 25 692
SCH80 PVC/CPVC Pipe
Pipe Size PSI Inches of water
2” 939 25989
2-1/2” 975 26986
3” 722 19983
4” 451 12482
6” 343 9493
8” 235 6504
10” 217 6504
12” 199 5508
18” 181 5010
20” 157 4346
24” 150 4152
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
De-rating Factors for PVC Pipe
Temperature (° F) Working De-rating Factor
73 1.00
80 0.88
90 0.75
100 0.62
110 0.51
120 0.40
130 0.31
140 0.22
De-rating Factors for CPVC Pipe
Temperature (° F) Working De-rating Factor
73 1.00
110 0.72
120 0.65
130 0.57
140 0.50
150 0.42
160 0.40
170 0.29
180 0.25
200 0.20
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.
Article Title:
Critical collapse pressure ratings of Harvel PVC and CPVC piping in PSI and inches of water
Article Summary:
Critical Collapse and De-rating Factors for PVC and CPVC pipe.
Article Date:
12/12/2007
Article ID:
777
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