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Maximum working pressure of cast iron pipe fittings - flanged fittings according ANSI B16.1.
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The maximum working pressure of cast iron pipe fittings - flanged fittings according ANSI B16.1 can be found in the table below.
| Maximum Working Pressure (psig) | |||||
| Temperature (oF) | Pressure Class | ||||
| 125 | 250 | ||||
| Pipe Size (inches) | |||||
| 1 - 12 | 14 - 24 | 30 - 48 | 1 - 12 | 14 - 24 1) | |
| -20 up to 150 | 200 | 150 | 150 | 500 | 300 |
| 200 | 190 | 135 | 115 | 460 | 280 |
| 225 | 180 | 130 | 100 | 440 | 270 |
| 250 | 175 | 125 | 85 | 415 | 260 |
| 275 | 170 | 120 | 65 | 395 | 250 |
| 300 | 165 | 110 | 50 | 375 | 240 |
| 325 | 155 | 105 | - | 355 | 230 |
| 350 | 150 | 100 | - | 335 | 220 |
| 375 | 145 | - | - | 315 | 210 |
| 400 | 140 | - | - | 290 | 200 |
| 425 | 130 | - | - | 270 | - |
| 450 | 125 | - | - | 250 | - |
1) For liquid services - flanges only
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