Maximum Pipe Pressure Chart
Threaded and welded steel pipe, acceptable for use with INERGEN agent systems, has the following acceptable pressure
capability based on:
NOTE: In the following Maximum Pipe Pressure Charts, all pipe sizes with pressure ratings in the shaded area comply with
the minimum allowable pressure for piping upstream of the pressure reducer.
Schedule 40 Threaded Pipe – Maximum Pressure (psi)
Grade Grade Grade Grade Grade
A-106C* A-53B, A-106B A-53B A-53A, A-106A A-53A
Diameter (Seamless) (Seamless) (ERW) (Seamless) (ERW)
in.
SE 21000 SE 18000 SE 15360 SE 14400 12240
0.25 3422 2933 2503 2347 1995
0.38 2924 2507 2139 2005 1705
0.5 2593 2222 1896 1778 1511
0.75 2234 1915 1634 1532 1302
1.0 2026 1736 1482 1390 1181
1.25 1782 1528 1304 1222 1038
1.50 1667 1429 1220 1144 972
2.0 1494 1280 1093 1025 871
2.5 1505 1290 1100 1032 877
3.0 1392 1193 1018 954 811
4.0 1278 1096 935 876 745
5.0 1193 1022 872 818 695
6.0 1141 978 834 782 664
8.0 1081 926 790 740 630
* This grade pipe may be difficult and expensive to get. Consult pipe supplier before accepting flow calculation maximum down stream pressure results.
SECTION V
UL EX-4510 12-1-01 Page 5-23
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