Maximum Pipe Pressure Chart
PIPE PRESSURE (Continued)
Schedule 80 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
5833
5000
4267
4000
3400
0.38
5102
4373
3732
3499
2974
0.5
4493
3851
3286
3080
2618
0.75
3874
3320
2833
2657
2258
1.0
3495
2996
2556
2397
2037
1.25
3073
2634
2248
2107
1792
1.5
2883
2472
2110
1978
1681
2.0
2625
2250
1920
1800
1530
2.5
2571
2204
1882
1764
1499
3.0
2400
2057
1756
1645
1399
4.0
2212
1896
1618
1517
1289
5.0
2076
1780
1518
1423
1210
6.0
2105
1804
1540
1442
1226
8.0
1948
1669
1424
1336
1135
For welded pipe or roll grooved pipe (fitting restricts pressure capability for roll grooved pipe):
Schedule 40 Welded – 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
6844
5867
5006
4693
3989
0.38
5662
4853
4142
3883
3300
0.5
5450
4672
3986
3737
3176
0.75
4520
3875
3306
3100
2634
1.0
4248
3641
3107
2912
2475
1.25
3542
3036
2591
2429
2064
1.50
3205
2747
2344
2197
1868
2.0
2723
2334
1992
1867
1588
2.5
2965
2542
2168
2033
1728
3.0
2592
2221
1896
1777
1511
4.0
2212
1896
1618
1516
1289
5.0
1948
1669
1424
1336
1135
6.0
1775
1522
1298
1217
1034
8.0
1568
1344
1147
1075
914
Schedule 80 Welded – 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
9256
7933
6770
6347
5395
0.38
7840
6720
5734
5376
4570
0.5
7350
6300
5376
5040
4284
0.75
6160
5280
4506
4224
3590
* 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 5-24