Technical FAQs
The maximum operating temperature of PVC pipe is 140°F. The pipe’s pressure rating, and other
performance characteristics, must be de-rated for all temperatures above 73.4°F (23°C); refer to the table below for the appropriate de-rating factors (Source: Handbook of PVC Pipe Design and Construction, Fifth Edition; Published by PVC Pipe Association).
| Maximum Service Temp °F (°C) | Multiply pressure class at 73.4°F (23°C) by factor shown |
|---|---|
|
80 (27) |
0.88 |
|
90 (32) |
0.75 |
|
100 (38) |
0.62 |
|
110 (43) |
0.50 |
|
120 (49) |
0.40 |
|
130 (54) |
0.30 |
|
140 (60) |
0.20 |
Notes:
- For temperatures in between those listed above, interpolate between the two closest temperatures to determine the specific de-rated pressure class.
- Pipe gaskets are typically not affected at the temperatures listed above.
- The de-rating factors assume sustained elevated service temperatures. When the contents of a PVC pressure pipe are only intermittently and temporarily raised above the service temperature shown, de-rating may not be needed.
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