ASME B16.5 – Steel Pipe Flanges – Pressure and Temperature Ratings – Group 1.2

ASME – American Society of Mechanical Engineers – is a 120,000-member professional organization focused on technical, educational and research issues of the engineering and technology community. ASME conducts one of the world’s largest technical publishing operations, holds numerous technical conferences worldwide, and offers hundreds of professional development courses each year. ASME sets internationally recognized industrial and manufacturing codes and standards that enhance public safety.

ANSI ASME B16.5 A350 LF2 RF RTJ blind flanges

ANSI ASME B16.5 A350 LF2 RF RTJ blind flanges

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

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

Working Pressure (bar) 
Temperature (°C)
Class
150 300 400 600 900 1500 2500
-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

The values in this table apply to materials Group 1.2

Pressure Ratings Group 12

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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