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Temperature derating factors of steel pipes due to stress are indicated below:
| Temperature | Temperature Derating Factor | |
|---|---|---|
| (oF) | (oC) | |
| < 250 | < 121 | 1.00 |
| 250 - 300 | 121 - 149 | 0.97 |
| 300 - 350 | 149 - 177 | 0.93 |
| 350 - 400 | 177 - 204 | 0.90 |
| 400 - 450 | 204 - 233 | 0.87 |
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