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Allowable Working Pressures for Carbon Steel Piping

Fluid Flow Hydraulic and Pneumatic Engineering and Design Menu

Allowable Working Pressures for Carbon Steel Piping

Pipe size
Schedule
Allowable internal
working pressure, psig
Allowable external
working pressure, psig
NPS
DN
number
1/8
3
40
1890
2070
80
3510
2860
1/4
6
40
1490
2000
80
2880
2700
3/8
10
40
1300
1660
80
2500
2280
1/2
15
40
1126
1580
80
2210
2140
3/4
20
40
994
1320
80
1890
1800
1
25
40
866
1210
80
1680
1670
1 -1/4
32
40
773
980
80
1470
1410
1 -1/2
40
40
740
890
80
1390
1270
2
50
40
670
750
2 -1/2
65
40
665
810
3
80
40
624
700
3 -1/2
90
40
600
640
4
100
40
580
580
6
150
40
534
450
8
200
40
515
390
10
250
40
496
340
12
300
40
436
260

Related:

Reference:

  • Reproduced from M. L. Nayyar, Piping Handbook, 7th ed., New York, McGraw-Hill, 2000.