Pressure Rating vs Service Temperature

Nom.size D
Outside
dia.
†Wall DR = D/†Pressure rating (P)
73°F90°F100°F110°F 120°F
PVCCPVCPVCPVCPVCPVCCPVC
f=1f=1f=0.75f=0.62f=0.50f=0.40f=0.65
S=2000S=2000S=1500S=1240S=1000S=800S=1300
1/20.840.1475.714848848636526424339552
3/41.050.1546.818688688516426344275447
11.3150.1797.346630630473390315252410
1 1/41.660.1918.691520520390322260208338
1 1/21.90.29.5471471353292235188306
22.3750.21810.894404404303251202162263
2 1/22.8750.27610.417425425319263212170276
33.50.311.667375375281233188150244
44.50.33713.353324324243201162130210
66.6250.43215.336279279209173140112181
88.6250.517.2524624618515312398160

Nom.size D
Outside
dia.
†Wall DR = D/† Pressure rating (P)
130°F 140°F160°F180°F200°F210°F
PVCCPVC PVCCPVCCPVCCPVCCPVCCPVC
f=0.30f=0.57 f=0.22f=0.50f=0.40f=0.25f=0.20f=0.16
S=600S=1135 S=440S=1000S=800S=500S=400S=320
1/20.840.1475.714255484 187424339212170136
3/41.050.1546.818206392 151344275172138110
11.3150.1797.346189359 139315252158126101
1 1/41.660.1918.691156296 11426020813010483
1 1/21.90.29.5141268 1042351881189475
22.3750.21810.894121230 892021621018165
2 1/22.8750.27610.417127242 932121701068568
33.50.311.667113214 83188150947560
44.50.33713.35397185 71162130816552
66.6250.43215.33684159 61140112705645
88.6250.517.2574140 5412398624939

P = Pressure rating of pipe at service temperatures (psi)
S = Hydrostatic design stress (psi)
D = Outside diameter of pipe (inches)
= Pipe wall thickness (inches)
f = Derating factor for service temperature
DR = Dimensions ratio (D/†)
P73°F = Pressure rating at 73°F

Note 1: Figures for pressure rating at 73°F are rounded off from actual calculated values. Pressure ratings for other temperatures are calculated from 73°F values.
Note 2: Pressure ratings are for PVC (12454-B) and CPVC (23447-B) pipes. For most sizes, pressure ratings are calculated from the experimentally determined long-term strength of PVC type 1 and CPVC extrusion compounds. Because molding compounds may differ in long-term strength and elevated temperature properties from pipe compounds, piping systems consisting of extruded pipe and molded fittings may have lower pressure ratings than those shown here, particularly at the higher temperatures. Caution should be exercised when designing PVC systems operating above 100°F and CPVC systems operating above 180°F.
Note 3: The pressure ratings given are for solvent-cemented systems. When adding valves, flanges, or other components, the system must be derated to the rating of the lowest component. (Pressure ratings: molded or cut threads are rated at 50% of solvent-cemented systems; flanges and unions are 150 psi; for valves, see manufacturer's recommendation.)
  
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