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Allowable Working Pressures for Carbon Steel Piping

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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.

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