Pressure-Temperature
Rating Chart
Flange pressure classes and maximum working pressures per ASME B16.5 (A105 Carbon Steel).
ASME B16.5 | A105
Flange Pressure-Temperature Rating Table
Flange Class Selector
Enter design pressure and temperature to determine the appropriate flange class.
| Temperature (°C) | Class 150 (bar) | Class 300 (bar) | Class 600 (bar) | Class 900 (bar) | Class 1500 (bar) | Class 2500 (bar) |
|---|---|---|---|---|---|---|
| -29 to 38 | 19.6 | 51.1 | 102.1 | 153.2 | 255.3 | 425.5 |
| 100 | 17.7 | 46.6 | 93.2 | 139.8 | 233.0 | 388.3 |
| 150 | 15.8 | 45.1 | 90.2 | 135.4 | 225.6 | 376.0 |
| 200 | 13.8 | 43.8 | 87.6 | 131.4 | 219.0 | 365.0 |
| 250 | 12.1 | 41.9 | 83.8 | 125.8 | 209.6 | 349.3 |
| 300 | 10.2 | 39.8 | 79.6 | 119.4 | 199.0 | 331.6 |
| 350 | 8.4 | 37.5 | 75.1 | 112.6 | 187.7 | 312.8 |
| 400 | 6.5 | 35.2 | 70.4 | 105.6 | 176.0 | 293.3 |
Technical Notes
- 1.Values are per ASME B16.5-2020, Material Group 1.1 (A105, A216 WCB, A515 Gr.70).
- 2.Different P-T values apply for stainless steel (316L, 304) and alloy steel flanges.
- 3.Pressures shown are Maximum Allowable Working Pressure (MAWP). Hydrostatic test pressure is 1.5x MAWP.
- 4.Flange class selection must consider both design pressure and temperature together. Cannot select based on pressure alone.
- 5.1 bar = 14.5038 psi = 0.1 MPa. Approximate: Class 150 ≈ PN 20, Class 300 ≈ PN 50.
* Source: ASME B16.5-2020, Table 2-1.1. Current standard must be used for design.
For Correct Flange Class Selection
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