astm a53 grade b

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
(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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Allowable Pressure of ASTM A53 Grade B Carbon Steel Pipes