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Pressure Temperature Ratings for Pipe Flanges

Fluids Flow Design and Engineering

(GPSA BOOK)
Pressure- Temperature Ratings for Pipe Flanges
and Flanged Fittings from ANSI B16.5-1981 
CLASS
150
300
400
600
900
1500
2500
See
Notes
Material Group 1.1                (Carbon Steel)
A105 (1)(3), A216-WCB(1), A515-70(1)
A516-70 (1)
A350-LF2, A537-C1.1
(a)  (h)
(a)  (g)
  (d)
⁰F
Pressures are in pounds per square inch, gauge (psig)
-20 to 100
200
300
400
285
260
230
200
740
675
655
635
990
900
875
845

1480
1350
1315
1270
2220
2025
1970
1900
3705
3375
3280
3170
6170
5625
5470
5280
500
600
650
700
170
140
125
110
600
550
535
535

800
730
715
710
1200
1095
1075
1065
1795
1640
1610
1600
2995
2735
2685
2665
4990
4560
4475
4440
750
800
850
900
95
80
65
50
505
410
270
170
670
550
355
230

1010
825
535
345
1510
1235
805
515
2520
2060
1340
860
4200
3430
2230
1430
950
1000
35
20
105
50
140
70
205
105
310
155
515
260
860
430
Material Group 2.1                        (Type 304)
A182-F304 (5), A182-F304H
A240-304 (5)(6), A351-CF8 (5)
A351-CF3 
 
-
-
(f)
-20 to 100
200
300
400
275
235
205
180

720
600
530
470
960
800
705
630
1440
1200
1055
940
2160
1800
1585
1410
3600
3000
2640
2350
6000
5000
4400
3920
500
600
700
170
140
110
435
415
405
585
555
540
875
830
805

1310
1245
1210
2185
2075
2015

3640
3460
3360
800
850
900
80
65
50
395
390
385
525
520
510
790
780
770
1180
1165
1150
1970
1945
1920
3280
3240
3200
950
1000
1050
1100
35
20
375
325
310
260
500
430
410
345
750
645
620
515
1125
965
925
770
1870
1610
1545
1285
3120
2685
2570
2145
1150
1200
1250
1300
195
155
110
85
260
205
145
110
390
310
220
165
585
465
330
245
980
770
550
410
1630
1285
915
685
1350
1400
1450
1500
60
50
35
25
85
65
45
30
125
90
70
50
185
145
105
70
310
240
170
120
515
400
285
200
Notes:     (a) Permissible but not recommended for prolonged use above 800⁰F
                (d) Not to be used over 650⁰F
                (f) Not to be used over 800⁰F
                (g) Not to be used over 850⁰F
                (h) Not to be used over 1000⁰F
Additional Notes:     
    (1) Upon prolonged exposure to temperatures above about 800⁰F (425⁰C), the carbide phase of carbonsteel may be converted to graphite   
  (3) Only killed steel shall be used above 850⁰F (455⁰C)
(5) At temperatures over 1000⁰F (540⁰C), use only when the carbon content is 0.04 percent or higher
(6) For temperatures above 1000⁰F (540⁰F), use only if the material is heat treated by heating it to a
temperature of at least 1900⁰F (1040⁰C) and quenching  in water or rapidly cooling by other means.

References:

(GPSA BOOK)
Gas Transmission and Distribution Piping
Code for Pressure Piping ANSI B31.8-1982

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