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Engineering ToolBox > Malleable Iron Threaded Fittings - Pressure-Temperature Ratings
This Standard for threaded malleable iron fittings Classes 150, and 300 provides requirements for the following:
Pressure-temperature ratings can be found in the table below:
| Pressure-Temperature ratings for malleable iron threaded fittings (psig) | |||||
| Temperature | Class | ||||
| 150 | 300 | ||||
| 1/4 - 1 inches | 1 1/4 - 2 inches | 2 1/2 - 3 inches | |||
| (oF) | (oC) | ||||
| -20 to 150 | -29 to 66 | 175 | 2000 | 1500 | 1000 |
| 200 | 93 | 265 | 1785 | 1350 | 910 |
| 250 | 121 | 185 | 1575 | 1200 | 825 |
| 300 | 149 | 150 | 1360 | 1050 | 735 |
| 350 | 177 | - | 1150 | 900 | 650 |
| 400 | 204 | - | 935 | 750 | 560 |
| 450 | 232 | - | 725 | 600 | 475 |
| 500 | 260 | - | 510 | 450 | 385 |
| 550 | 288 | - | 300 | 300 | 300 |