ANSI B16.5 - Maximum Pressure and Temperature Ratings of Flanges and Flange Fittings ~ Learning Instrumentation And Control Engineering Learning Instrumentation And Control Engineering

ANSI B16.5 - Maximum Pressure and Temperature Ratings of Flanges and Flange Fittings

Custom Search

The Maximum allowable non-shock pressure (psig) and temperature ratings for steel pipe flanges and flanged fittings according the American National Standard ANSI B16.5 are given in the table below. 

Flanges and their Fittings are a common feature in the process plants. The need to accurately determine their pressure rating and corresponding temperature ratings is important for personnel and plant safety and overall plant performance and reliability:


Maximum Allowable Non-Shock Pressure (Psig)
Temperature (°F)
Pressure Class (lb)
150
300
400
600
900
1500
2500
Hydrostatic Test Pressure (Psig)
450
1125
1500
2225
3350
5575
9275
-20 to 100
285
740
990
1480
2220
3705
6170
200
260
675
900
1350
2025
3375
5625
300
230
655
875
1315
1970
3280
5470
400
200
635
845
1270
1900
3170
5280
500
170
600
800
1200
1795
2995
4990
600
140
550
730
1095
1640
2735
4560
650
125
535
715
1075
1610
2685
4475
700
110
535
710
1065
1600
2665
4440
750
95
505
670
1010
1510
2520
4200
800
80
410
550
825
1235
2060
3430
850
65
270
355
535
805
1340
2230
900
50
170
230
345
515
860
1430
950
35
105
140
205
310
515
860
1000
20
50
70
105
155
260
430