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Allowable Pressure of ASTM A53 Grade B Carbon Steel Pipes

A53B refers to ordinary carbon steel pipe, which is grade B in the A53 standard, and ASTM A53 is a general purpose seamless steel pipe
Gr.B or B refers to the inner grade B material in the ASTM A53 standard.
Maximum working pressure of carbon steel pipe at temperature 400°F
Maximum allowable pressure is calculated with the Barlow's formula for A53 Grade B Seamless and Welded Standard Steel Pipe with Yield Strength 35000 psi and design factor 0.7.

Allowable stress used in the Barlow's formula is calculated as

(35000 psi) 0.7 = 24500 psi

The dimensions - outside pipe diameters and wall thicknesses are according ANSI B36.10.

 
Maximum Allowable Pressure (psi) 
NPS Outside Diameter Schedule
(in) (in) 10 20 30 STD 40 60 XS 80 100 120 140 160 XXS
1/4 0.54       7985 7985   10798 10798          
3/8 0.675       6606 6606   9147 9147          
1/2 0.84       6358 6358   8575 8575       10908 17150
3/4 1.05       5273 5273   7187 7187       10220 14373
1 1.315       4956 4956   6670 6670       9316 13340
1 1/4 1.66       4133 4133   5638 5638       7380 11276
1 1/2 1.9       3739 3739   5158 5158       7247 10316
2 2.375       3177 3177   4498 4498       7097 8995
2 1/2 2.875       3460 3460   4704 4704       6391 9408
3 3.5       3024 3024   4200 4200       6132 8400
3 1/2 4       2769 2769   3896 3896          
4 4.5       2581 2581   3670 3670   4769   5782 7339
5 5.563       2273 2273   3303 3303   4404   5505 6606
6 6.625       2071 2071   3195 3195   4157   5318 6390
8 8.625   1420 1574 1829 1829 2307 2841 2841 3375 4085 4613 5147 4971
10 10.75   1140 1399 1664 1664 2279 2279 2708 3277 3847 4558 5128 4558
12 12.75   961 1268 1441 1560 2160 1922 2644 3244 3843 4324 5042 3843
14 14 875 1092 1313 1313 1533 2079 1750 2625 3283 3829 4375 4921  
16 16 766 956 1148 1148 1531 2009 1531 2585 3157 3733 4404 4882  
18 18 681 849 1192 1021 1530 2042 1361 2553 3147 3743 4252 4848  
20 20 613 919 1225 919 1455 1989 1225 2526 3138 3675 4288 4824  
22 22 557 835 1114 835   1949 1114 2506 3063 3619 4176 4733  
24 24 510 766 1147 766 1405 1978 1021 2489 3126 3700 4210 4786  
30 30 510 817 1021 613     817            
32 32 478 766 957 574 1054                
34 34 450 721 901 540 992                
36 36 425 681 851 510 1021                
42 42   583 729 438 875                

1 in (inch) = 25.4 mm
1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-2 bar



 

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