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ANSI B16.5 - Steel Pipe Flanges - Pressure and Temperature Ratings - Group 1.2

Pressure (psig) and temperature ratings for steel pipe flanges and flanged fittings

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Pressure (psig) and temperature ratings for steel pipe flanges and flanged fittings according the American National Standard ANSI B16.5 - 1988 Group 1.2:

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Working Pressure (bar)
Temperature (°C)
Class
15030040060090015002500
-29 - 38 19.8 51.7 68.9 103.4 155.1 258.6 430.9
50 19.5 51.7 68.9 103.4 155.1 258.6 430.9
100 17.7 51.5 68.7 103.0 154.6 257.6 429.4
150 15.8 50.2 66.8 100.3 150.5 250.8 418.1
200 13.8 48.6 64.8 97.2 145.8 243.2 405.4
250 12.1 46.3 61.7 92.7 139.0 231.8 386.2
300 10.2 42.9 57.0 85.7 128.6 214.4 357.1
325 9.3 41.4 55.0 82.6 124.0 206.6 344.3
350 8.4 40.0 53.4 80.0 120.1 200.1 333.5
375 7.4 37.8 50.4 75.7 113.5 189.2 315.3
400 6.5 34.7 46.3 69.4 104.2 173.6 289.7
425 5.5 28.8 38.4 57.5 86.3 143.8 239.7
450 4.6 23.0 30.7 46.0 69.0 115.0 191.7
475 3.7 17.1 22.8 34.2 51.3 85.4 142.4
500 2.8 11.6 15.4 23.2 34.7 57.9 96.5
538 1.4 5.9 7.9 11.8 17.7 29.5 49.2

The values in this table apply to materials Group 1.2

For other Material Groups the Pressure-Temperature Ratings are different. Most carbon steels are only acceptable for temperatures below 800 F.

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