# Schedule 40 PVC Pipe Dimensions

Nom Pipe Size Nominal pipe size. Other sizes are manufactured, but are not likely to be available in consumer stores.
OD Outside diameter. This is the same value for schedule 40, schedule 80, and schedule 120 PVC pipe—thicker walls make the ID smaller.
Avg ID Average inside diameter. This is the measurement that is used to determine the PVC pipe size.
Min Wall Minimum wall thickness.
Nom Wt/Ft Nominal weight in pounds per foot.
Max WP PSI Maximum working pressure in pounds per square inch. The maximum working pressure rating is for water at 73 °F, using solvent-cemented joints. Adjustment factors for higher temperatures are given below the table.

## Schedule 40 PVC Pipe Dimensions

Nom Pipe Size OD Avg ID Min Wall Nom Wt/Ft Max WP PSI
1/4 .540 .344 .088 .086 780
3/8 .675 .473 .091 .115 620
1/2 .840 .602 .109 .170 600
3/4 1.050 .804 .113 .226 480
1” 1.315 1.029 .133 .333 450
1 1/4 1.660 1.360 1.140 .450 370
1 1/2 1.900 1.590 .145 .537 330
2” 2.375 2.047 .154 .720 280
2 1/2 2.875 2.445 .203 1.136 300
3” 3.500 3.042 .216 1.488 260
4” 4.500 3.998 .237 2.188 220

## Working Pressure Adjustment Factors for Higher Temperatures

Operating Temperature Degrees F Adjustment Factor
73 °F 1.00
80 °F 0.88
90 °F 0.75
100 °F 0.62
110 °F 0.51
120 °F 0.40
130 °F 0.31
140 °F 0.22

Example: At 73 °F, 1” schedule 40 pipe has a maximum working pressure of 450 PSI. At 100 °F, that same pipe has a maximum working pressure of (450 × 0.62 =) 279 PSI.