Pressure and Temperature Ratings of A53 B, A106 B, A333, A334 and API 5L Carbon Steel Pipes

2020-06-12 15:37:09 Views:3304 Company News / News

Pressure (psig) and temperature (deg F) ratings for A-53 B and A-106 B, A333, A334 and API 5L carbon steel pipes – temperatures ranging 100 °F – 700 °F

Ratings calculated (see below the table) according ASME B31.3-2002 Table K-1 for plain end standard seamless carbon steel pipes and tubes spec. no. A-53 B, A-106 B, A333, A334 and API 5L. Temperatures ranging 100 °F – 700 °F.

API 5L PSL1 Grade B seamless steel pipes

Pressure and Temperature Ratings ASTM A-53, A-106 and API 5L Grade B Carbon Steel Pipes – Metric Units

Specified min. tensile strength 60 ksi (60000 psi).

Size *(in)*	Outside Diameter *(in)*	Wall Thickness *(in)*	Inside Diameter *(in)*	Schedule	Temperature (^oF)
					100	200	300	400	500	600	650	700
					Allowable Stress *(psi)*
					20000	20000	20000	20000	18900	17300	17000	16500
1/2	0.840	0.109	0.622	40	4995	4995	4995	4995	4721	4321	4246	4121
	0.840	0.147	0.546	80	6980	6980	6980	6980	6596	6038	5933	5759
	0.840	0.188	0.464	160	9289	9289	9289	9289	8778	8035	7895	7663
	0.840	0.294	0.252		16225	16225	16225	16225	15333	14035	13791	13386
3/4	1.050	0.113	0.824	40	4074	4074	4074	4074	3849	3524	3463	3361
	1.050	0.154	0.742	80	5721	5721	5721	5721	5406	4948	4863	4720
	1.050	0.219	0.612	160	8548	8548	8548	8548	8078	7394	7266	7052
	1.050	0.308	0.434		12919	12919	12919	12919	12209	11175	10982	10659
1	1.315	0.133	1.049	40	3810	3810	3810	3810	3600	3295	3238	3143
	1.315	0.179	0.957	80	5266	5266	5266	5266	4976	4555	4476	4344
	1.315	0.25	0.815	160	7675	7675	7675	7675	7253	6639	6524	6332
	1.315	0.358	0.599		11772	11772	11772	11772	11124	10183	10006	9712
1 1/4	1.660	0.14	1.38	40	3137	3137	3137	3137	2964	2714	2666	2588
	1.660	0.191	1.278	80	4380	4380	4380	4380	4139	3789	3723	3613
	1.660	0.25	1.16	160	5892	5892	5892	5892	5568	5097	5008	4861
	1.660	0.382	0.896		9601	9601	9601	9601	9073	8305	8161	7921
1 1/2	1.900	0.145	1.61	40	2822	2822	2822	2822	2667	2441	2399	2328
	1.900	0.2	1.5	80	3977	3977	3977	3977	3759	3440	3381	3281
	1.900	0.281	1.338	160	5774	5774	5774	5774	5457	4995	4908	4764
	1.900	0.4	1.1		8642	8642	8642	8642	8167	7475	7346	7130

1) STD (standard) = schedule 40

2) XS (extra strong) = schedule 80

Allowable Pressure Equation

The calculations of allowable pressure in the table above are made with the ANSI/ASME Piping Code B31.1 equation:

P = 2 SE (tm – A) / (Do – 2 y (tm – A)) (1)

where

P = allowable pressure (psi)

SE = maximum allowable stress in pipe wall (psi)

tm = wall thickness (in) Note! -12.5% manufacturing tolerance on wall thickness are used in the calculations above.

A = additional thickness depending of type of pipe (in) (A = 0 in for the calculations above)

y = a coefficient depending on material and temperature range (y = 0.4 for the calculations above)

Do = outside diameter (in)

Barlow’s Formula

Example – Calculating Allowable Pressure for a Steel Pipe

The allowable pressure for a 4 inch schedule 40 pipe at temperature 100oF and allowable stress 20000 psi can be calculated as

P = 2 (20000 psi) ((1 – 0.125) (0.237 in) – (0 in)) / ((4.5 in) – 2 (0.4) ((1 – 0.125) (0.237 in) – (0 in))) = 1914 psi

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Pressure and Temperature Ratings of A53 B, A106 B, A333, A334 and API 5L Carbon Steel Pipes

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