NOMINAL WORKING PRESSURE CHART GENERAL AUSTENITIC GRADES 01
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Nominal Working Pressure Chart - General Austenitic Grades

(This chart is based on a nominal safety factor of 4 and applies to seamless pipe only)

Nominal Bore Size Schedule 10S Schedule 40S Schedule 80S
Temp °C
mm In 50 100 150 200 250 300 350 400 50 100 150 200 250 300 350 400 50 100 150 200 250 300 350 400
6 18 30.1 26.8 23.4 21.7 20.2 19.2 18.5 17.9 42.1 37.3 32.6 30.3 28.2 26.7 25.9 25.0 58.6 52.0 45.5 42.2 39.3 37.3 36.0 34.8
8 14 30.1 26.8 23.4 21.7 20.2 19.2 18.5 17.9 40.9 36.3 31.8 29.5 27.5 26.0 25.2 24.3 55.2 49.0 42.8 39.7 37.0 35.1 33.9 32.8
10 38 24.1 21.4 18.7 17.4 16.2 15.4 14.9 14.4 33.8 30.0 26.2 24.3 22.7 21.5 20.8 20.1 46.8 41.6 36.4 33.7 31.4 29.8 28.8 27.8
15 12 24.8 22.0 19.2 17.9 16.6 15.8 15.3 14.7 32.5 28.9 25.3 23.4 21.8 20.7 20.0 19.3 43.8 38.9 34.0 31.6 29.4 27.9 27.0 26.0
20 34 19.8 17.6 15.4 14.2 13.3 12.6 12.2 11.8 26.9 23.9 20.9 19.4 18.1 17.1 16.6 16.0 36.6 32.5 28.4 26.4 24.6 23.3 22.6 21.8
25 1 20.8 18.4 16.1 14.9 13.9 13.2 12.8 12.3 25.3 22.5 19.7 18.2 17.0 16.1 15.6 15.1 34.1 30.3 26.5 24.6 22.9 21.7 21.0 20.3
32 114 16.4 14.6 12.8 11.8 11.0 10.5 10.1 9.8 21.1 18.7 16.4 15.2 14.2 13.4 13.0 12.5 28.8 25.5 22.3 20.7 19.3 18.3 17.7 17.1
40 112 14.4 12.7 11.1 10.3 9.6 9.1 8.8 8.5 19.1 16.9 14.8 13.7 12.8 12.1 11.7 11.3 26.3 23.4 20.4 19.0 17.7 16.7 16.2 15.6
50 2 11.5 10.2 8.9 8.3 7.7 7.3 7.1 6.8 16.2 14.4 12.6 11.7 10.9 10.3 10.0 9.6 23.0 20.4 17.8 16.6 15.4 14.6 14.1 13.7
65 212 10.5 9.3 8.1 7.5 7.0 6.7 6.4 6.2 17.7 15.7 13.7 12.7 11.9 11.3 10.9 10.5 24.0 21.3 18.7 17.3 16.1 15.3 14.8 14.3
80 3 8.6 7.6 6.7 6.2 5.8 5.5 5.3 5.1 15.5 13.7 12.0 11.1 10.4 9.8 9.5 9.2 21.5 19.1 16.7 15.5 14.4 13.7 13.2 12.8
90 312 7.5 6.7 5.8 5.4 5.0 4.8 4.6 4.5 14.1 12.6 11.0 10.2 9.5 9.0 8.7 8.4 19.9 17.7 15.4 14.3 13.4 12.7 12.2 11.8
100 4 6.7 5.9 5.2 4.8 4.5 4.2 4.1 4.0 13.2 11.7 10.2 9.5 8.8 8.4 8.1 7.8 18.7 16.6 14.5 13.5 12.6 11.9 11.5 11.1
125 5 6.0 5.3 4.7 4.3 4.0 3.8 3.7 3.6 11.6 10.3 9.0 8.4 7.8 7.4 7.1 6.9 16.9 15.0 13.1 12.2 11.3 10.7 10.4 10.0
150 6 5.1 4.5 3.9 3.6 3.4 3.2 3.1 3.0 10.6 9.4 8.2 7.6 7.1 6.7 6.5 6.3 16.3 14.5 12.7 11.7 11.0 10.4 10.0 9.7
200 8 4.3 3.8 3.3 3.1 2.9 2.7 2.6 2.6 9.3 8.3 7.3 6.7 6.3 5.9 5.7 5.6 14.5 12.9 11.3 10.4 9.7 9.2 8.9 8.6
250 10 3.8 3.4 3.0 2.8 2.6 2.4 2.4 2.3 8.5 7.5 6.6 6.1 5.7 5.4 5.2 5.0 11.6 10.3 9.0 8.4 7.8 7.4 7.2 6.9
300 12 3.5 3.1 2.7 2.5 2.4 2.2 2.2 2.1 7.4 6.5 5.7 5.3 4.9 4.7 4.5 4.4 9.8 8.7 7.6 7.1 6.6 6.2 6.0 5.8

Nominal working pressures are shown in MPa
Nominal working pressures for welded pipe can be calculated by multiplying the figure in the tables by 0.85 (weld joint efficiency factor).