Schedule 40
Schedule 80
Nominal Pipe Size (in)  O.D.  Average I.D.  Min. Wall  Nominal Wt./Ft.  Max. W.P. PSI @ 73DEG
 1/8 .405 .261 .068 .045  810
1/4 .540 .354 .088 .081  780
3/8 .675 .483 .091 .109  620
1/2 .840 .608 .109 .161 600
3/4 1.050 .810 .113 .214 480
1 1.315 1.033 .133 .315 450
1-1/4 1.660 1.364 .140 .426 370
1 -1/2 1.900 1.592 .145 .509 330
2 2.375 2.049 .154 .682 280
2-1/2 2.875 2.445 .203 1.076 300
3 3.500 3.042 .216 1.409 260
3-1/2 4.000 3.520 .226 1.697 240
4 4.500 3.998 .237 2.006 220
5 5.563 5.017 .258 2.726 190
6 6.625 6.031 .280 3.535 180
8 8.625 7.943 .322 5.305 160
10 10.750 9.976 .365 7.532 140
12 12.750 11.890 .406 9.949 130
14 14.000 13.072 .437 11.810 130
16 16.000 14.940 .500 15.416 130
18 18.000 16.809 .562 20.112 130
20 20.000 18.743 .593 23.624 120
24 24.000 22.544 .687 32.873 120
Nominal Pipe Size (in)  O.D.  Average I.D.  Min. Wall  Nominal Wt./Ft.  Max. W.P. PSI@73DEG
1/8 .405 .203 .095 .058  1230
1/4 .540 .288 .119 .100  1130
3/8 .675 .407 .126 .138  920
1/2 .840 .528 .147 .202 850
3/4 1.050 .724 .154 .273 690
1 1.315 .935 .179 .402 630
1-1/4 1.660 1.256 .191 .554 520
1 -1/2 1.900 1.476 .200 .673 470
2 2.375 1.913 .218 .932 400
2-1/2 2.875 2.289 .276 1.419 420
3 3.500 2.864 .300 1.903 370
3-1/2 4.000 3.326 .318 2.322 350
4 4.500 3.786 .337 2.782 320
5 5.563 4.767 .375 3.867 290
6 6.625 5.709 .432 5.313 280
8 8.625 7.565 .500 8.058 250
10 10.750 9.492 .593 11.956 230
12 12.750 11.294 .687 16.437 230
14 14.000 12.410 .750 19.790 220
16 16.000 14.214 .843 25.430 220
18 18.000 16.014 .937 31.830 220
20 20.000 17.814 1.031 40.091 220
24 24.000 21.418 1.218 56.882 210

CPVC Industrial Pipe Temperature Derating

Operating Temp (°F)
De-Rating Factor
73-80
1.00
90
0.91
100
0.82
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

The pressure ratings given are for water, non-shock, @ 73°F. The following temperature de-rating factors are to be applied to the working pressure ratings listed when operating at elevated temperatures.

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

EX: 10" CPVC SCH 80 @ 120°F = ?
230 psi x 0.65 = 149.5 psi max. @ 120°F

THE MAXIMUM SERVICE TEMPERATURE FOR CPVC IS 200°F.

Solvent cemented joints should be utilized when working at or near maximum temperatures. We do not recommend the use of CPVC for threaded connections at temperatures above 150°F; use flanged joints, unions, or roll grooved couplings where disassembly is necessary at elevated temperatures.

Threading of Sch 40 CPVC pipe is not a recommended practice due to insufficient wall thickness. Thread only Sch 80 or heavier walls.

Threading requires a 50% reduction in pressure rating stated for plain end pipe @73°F.

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