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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)
|
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Temperature (°F)
|
Pressure Class (lb)
|
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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
|
