Pressure and Temperature Ratings of ASTM A-53 B

A-106 B, API 5L, Seamless Pipes

NPS..Nominal Pipesize

OD..Outside Diameter (mm)

SCH..Schedule

WT..Wall Thickness (mm)

NPS	OD	SCH		WT	Temp. (°C)
					204	260
					Allowable Stress (MPa)
					137.9	130.3
					Maximum Allowable Stress (MPa)
1/2	21.3	STD	40	2.77	34.5	32.6
3/4	26.7	STD	40	2.87	28.1	26.5
3/4	26.7	XS	80	3.91	39.4	37.2
1	33.4	STD	40	3.38	26.3	24.8
1	33.4	XS	80	4.55	36.3	34.3
1.1/4	42.2	STD	40	3.56	21.6	20.4
		XS	80	4.85	30.2	28.5
			160	6.35	40.6	38.4
1.1/2	48.3	STD	40	3.68	19.4	18.4
		XS	80	5.08	27.4	25.9
			160	7.14	39.8	37.6
2	60.3	STD	40	3.91	16.4	15.5
		XS	80	5.54	23.7	22.4
			160	8.74	38.9	36.8
2.1/2	73	STD	40	5.16	17.9	17
		XS	80	7.01	24.8	23.5
			160	9.53	34.7	32.8
3	88.9	STD	40	5.49	15.6	14.7
		XS	80	7.62	22	20.8
			160	11.13	33.1	31.3
4	114.3	STD	40	6.02	13.2	12.5
		XS	80	8.56	19.1	18
			120	11.13	25.2	23.8
			160	13.49	31	29.3
		XXS		17.12	40.4	38.2
5	141.3	STD	40	6.55	11.6	10.9
		XS	80	9.53	17.1	16.1
			120	12.7	23.1	21.9
			160	15.88	29.4	27.8
		XXS		19.05	35.9	33.9
6	168.3	STD	40	7.11	10.5	9.9
		XS	80	10.97	16.5	15.6
			120	14.27	21.8	20.6
		XXS	160	18.26	28.3	26.8
8	219.1		20	6.35	7.1	6.7
			30	7.04	7.9	7.5
		STD	40	8.18	9.3	8.7
			60	10.31	11.7	11.1
		XS	80	12.7	14.6	13.8
			100	15.09	17.5	16.5
			120	18.26	21.4	20.2
			140	20.62	24.3	23
		XXS		22.23	26.4	24.9
			160	23.01	27.4	25.8
10	273.1		20	6.35	5.7	5.4
			30	7.8	7	6.6
		STD	40	9.27	8.4	7.9
		XS	60	12.7	11.6	11
			80	15.09	13.9	13.1
			100	18.26	16.9	16
			120	21.44	20	18.9
		XXS	140	25.4	24	22.7
			160	28.58	27.3	25.8
12	323.9		20	6.35	4.8	4.5
			30	8.38	6.4	6
		STD		9.53	7.2	6.9
			40	10.31	7.9	7.4
		XS		12.7	9.7	9.2
			60	14.27	11	10.4
			80	17.48	13.5	12.8
			100	21.44	16.8	15.8
		XXS	120	25.4	20	18.9
			140	28.58	22.7	21.4
			160	33.32	26.8	25.3
14	355.6		10	6.35	4.4	4.1
			20	7.92	5.5	5.2
		STD	30	9.53	6.6	6.2
			40	11.13	7.7	7.3
		XS		12.7	8.8	8.4
			60	15.09	10.6	10
			80	19.05	13.4	12.7
			100	23.83	17	16
			120	27.79	20	18.9
			140	31.75	23	21.7
			160	35.71	26.1	24.6
16	406.4		10	6.35	3.8	3.6
			20	7.92	4.8	4.5
		STD	30	9.53	5.8	5.4
		XS	40	12.7	7.7	7.3
			60	16.66	10.2	9.6
			80	21.44	13.2	12.5
			100	26.19	16.3	15.4
			120	30.96	19.4	18.4
			140	36.53	23.1	21.9
			160	40.49	25.8	24.4
18	457		10	6.35	3.4	3.2
			20	7.92	4.2	4
		STD		9.53	5.1	4.8
		XS	30	11.13	6	5.7
				12.7	6.8	6.5
			40	14.27	7.7	7.3
			60	19.05	10.4	9.8
			80	23.83	13.1	12.3
			100	29.36	16.2	15.3
			120	34.93	19.5	18.4
			140	39.67	22.3	21.1
			160	45.24	25.7	24.3
20	508		10	6.35	3	2.9
		STD	20	9.53	4.6	4.3
		XS	30	12.7	6.1	5.8
			40	15.09	7.3	6.9
			60	20.62	10.1	9.5
			80	26.19	12.9	12.2
			100	32.54	16.2	15.3
			120	38.1	19.1	18.1
			140	44.45	22.5	21.3
			160	50.01	25.5	24.1
24	610		10	6.35	2.5	2.4
		STD	20	9.53	3.8	3.6
		XS		12.7	5.1	4.8
			30	14.27	5.7	5.4
			40	17.48	7.1	6.7
			60	24.61	10	9.5
			80	30.96	12.7	12
			100	38.89	16.1	15.2
			120	46.02	19.2	18.2
			140	52.37	22	20.8
			160	59.54	25.3	23.9

NPS..Nominal Pipesize

OD..Outside Diameter (mm)

SCH..Schedule

WT..Wall Thickness (mm)

NPS	OD	SCH		WT	Temp. (°C)
					343	371
					Allowable Stress (MPa)
					117.2	113.8
					Maximum Allowable Stress (MPa)
1/2	21.3	STD	40	2.77	29.3	28.5
3/4	26.7	STD	40	2.87	23.8	23.1
3/4	26.7	XS	80	3.91	33.5	32.5
1	33.4	STD	40	3.38	22.3	21.7
1	33.4	XS	80	4.55	30.9	30
1.1/4	42.2	STD	40	3.56	18.4	17.8
		XS	80	4.85	25.6	24.9
			160	6.35	34.5	33.5
1.1/2	48.3	STD	40	3.68	16.5	16
		XS	80	5.08	23.3	22.6
			160	7.14	33.8	32.8
2	60.3	STD	40	3.91	13.9	13.5
		XS	80	5.54	20.1	19.5
			160	8.74	33.1	32.1
2.1/2	73	STD	40	5.16	15.3	14.8
		XS	80	7.01	21.1	20.5
			160	9.53	29.5	28.6
3	88.9	STD	40	5.49	13.2	12.8
		XS	80	7.62	18.7	18.2
			160	11.13	28.1	27.3
4	114.3	STD	40	6.02	11.2	10.9
		XS	80	8.56	16.2	15.7
			120	11.13	21.4	20.8
			160	13.49	26.4	25.6
		XXS		17.12	34.3	33.3
5	141.3	STD	40	6.55	9.8	9.5
		XS	80	9.53	14.5	14.1
			120	12.7	19.7	19.1
			160	15.88	25	24.3
		XXS		19.05	30.5	29.6
6	168.3	STD	40	7.11	8.9	8.7
		XS	80	10.97	14	13.6
			120	14.27	18.5	17.9
		XXS	160	18.26	24.1	23.4
8	219.1		20	6.35	6.1	5.9
			30	7.04	6.7	6.5
		STD	40	8.18	7.9	7.6
			60	10.31	10	9.7
		XS	80	12.7	12.4	12
			100	15.09	14.8	14.4
			120	18.26	18.2	17.6
			140	20.62	20.7	20.1
		XXS		22.23	22.4	21.7
			160	23.01	23.3	22.6
10	273.1		20	6.35	4.8	4.7
			30	7.8	6	5.8
		STD	40	9.27	7.1	6.9
		XS	60	12.7	9.9	9.6
			80	15.09	11.8	11.4
			100	18.26	14.4	14
			120	21.44	17	16.5
		XXS	140	25.4	20.4	19.8
			160	28.58	23.2	22.5
12	323.9		20	6.35	4.1	4
			30	8.38	5.4	5.2
		STD		9.53	6.2	6
			40	10.31	6.7	6.5
		XS		12.7	8.3	8
			60	14.27	9.3	9
			80	17.48	11.5	11.2
			100	21.44	14.2	13.8
		XXS	120	25.4	17	16.5
			140	28.58	19.3	18.7
			160	33.32	22.7	22.1
14	355.6		10	6.35	3.7	3.6
			20	7.92	4.6	4.5
		STD	30	9.53	5.6	5.4
			40	11.13	6.6	6.4
		XS		12.7	7.5	7.3
			60	15.09	9	8.7
			80	19.05	11.4	11.1
			100	23.83	14.4	14
			120	27.79	17	16.5
			140	31.75	19.5	19
			160	35.71	22.2	21.5
16	406.4		10	6.35	3.2	3.1
			20	7.92	4.1	3.9
		STD	30	9.53	4.9	4.7
		XS	40	12.7	6.6	6.4
			60	16.66	8.7	8.4
			80	21.44	11.2	10.9
			100	26.19	13.8	13.4
			120	30.96	16.5	16
			140	36.53	19.7	19.1
			160	40.49	22	21.3
18	457		10	6.35	2.9	2.8
			20	7.92	3.6	3.5
		STD		9.53	4.3	4.2
		XS	30	11.13	5.1	4.9
				12.7	5.8	5.6
			40	14.27	6.5	6.4
			60	19.05	8.8	8.5
			80	23.83	11.1	10.8
			100	29.36	13.8	13.4
			120	34.93	16.6	16.1
			140	39.67	19	18.4
			160	45.24	21.8	21.2
20	508		10	6.35	2.6	2.5
		STD	20	9.53	3.9	3.8
		XS	30	12.7	5.2	5.1
			40	15.09	6.2	6
			60	20.62	8.6	8.3
			80	26.19	11	10.6
			100	32.54	13.8	13.4
			120	38.1	16.2	15.8
			140	44.45	19.1	18.6
			160	50.01	21.7	21
24	610		10	6.35	2.2	2.1
		STD	20	9.53	3.2	3.1
		XS		12.7	4.3	4.2
			30	14.27	4.9	4.7
			40	17.48	6	5.8
			60	24.61	8.5	8.3
			80	30.96	10.8	10.5
			100	38.89	13.7	13.3
			120	46.02	16.3	15.9
			140	52.37	18.7	18.2
			160	59.54	21.5	20.9

NPS..Nominal Pipesize

OD..Outside Diameter (mm)

SCH..Schedule

WT..Wall Thickness (mm)

NPS	OD	SCH		WT	Temp. (°C)
					399	427
					Allowable Stress (MPa)
					89.6	74.5
					Maximum Allowable Stress (MPa)
1/2	21.3	STD	40	2.77	22.4	18.6
3/4	26.7	STD	40	2.87	18.2	15.1
3/4	26.7	XS	80	3.91	25.6	21.3
1	33.4	STD	40	3.38	17.1	14.2
1	33.4	XS	80	4.55	23.6	19.6
1.1/4	42.2	STD	40	3.56	14.1	11.7
		XS	80	4.85	19.6	16.3
			160	6.35	26.4	21.9
1.1/2	48.3	STD	40	3.68	12.6	10.5
		XS	80	5.08	17.8	14.8
			160	7.14	25.9	21.5
2	60.3	STD	40	3.91	10.7	8.9
		XS	80	5.54	15.4	12.8
			160	8.74	25.3	21
2.1/2	73	STD	40	5.16	11.7	9.7
		XS	80	7.01	16.1	13.4
			160	9.53	22.5	18.7
3	88.9	STD	40	5.49	10.1	8.4
		XS	80	7.62	14.3	11.9
			160	11.13	21.5	17.9
4	114.3	STD	40	6.02	8.6	7.1
		XS	80	8.56	12.4	10.3
			120	11.13	16.4	13.6
			160	13.49	20.2	16.8
		XXS		17.12	26.2	21.8
5	141.3	STD	40	6.55	7.5	6.2
		XS	80	9.53	11.1	9.2
			120	12.7	15	12.5
			160	15.88	19.1	15.9
		XXS		19.05	23.4	19.4
6	168.3	STD	40	7.11	6.8	5.7
		XS	80	10.97	10.7	8.9
			120	14.27	14.1	11.7
		XXS	160	18.26	18.4	15.3
8	219.1		20	6.35	4.6	3.9
			30	7.04	5.2	4.3
		STD	40	8.18	6	5
			60	10.31	7.6	6.3
		XS	80	12.7	9.5	7.9
			100	15.09	11.4	9.4
			120	18.26	13.9	11.5
			140	20.62	15.8	13.1
		XXS		22.23	17.1	14.2
			160	23.01	17.8	14.8
10	273.1		20	6.35	3.7	3.1
			30	7.8	4.6	3.8
		STD	40	9.27	5.5	4.5
		XS	60	12.7	7.5	6.3
			80	15.09	9	7.5
			100	18.26	11	9.1
			120	21.44	13	10.8
		XXS	140	25.4	15.6	13
			160	28.58	17.7	14.7
12	323.9		20	6.35	3.1	2.6
			30	8.38	4.1	3.4
		STD		9.53	4.7	3.9
			40	10.31	5.1	4.2
		XS		12.7	6.3	5.3
			60	14.27	7.1	5.9
			80	17.48	8.8	7.3
			100	21.44	10.9	9
		XXS	120	25.4	13	10.8
			140	28.58	14.8	12.3
			160	33.32	17.4	14.4
14	355.6		10	6.35	2.8	2.4
			20	7.92	3.5	2.9
		STD	30	9.53	4.3	3.6
			40	11.13	5	4.2
		XS		12.7	5.7	4.8
			60	15.09	6.9	5.7
			80	19.05	8.7	7.3
			100	23.83	11	9.2
			120	27.79	13	10.8
			140	31.75	14.9	12.4
			160	35.71	16.9	14.1
16	406.4		10	6.35	2.5	2.1
			20	7.92	3.1	2.6
		STD	30	9.53	3.7	3.1
		XS	40	12.7	5	4.2
			60	16.66	6.6	5.5
			80	21.44	8.6	7.1
			100	26.19	10.6	8.8
			120	30.96	12.6	10.5
			140	36.53	15	12.5
			160	40.49	16.8	14
18	457		10	6.35	2.2	1.8
			20	7.92	2.8	2.3
		STD		9.53	3.3	2.8
		XS	30	11.13	3.9	3.2
				12.7	4.4	3.7
			40	14.27	5	4.2
			60	19.05	6.7	5.6
			80	23.83	8.5	7.1
			100	29.36	10.6	8.8
			120	34.93	12.7	10.5
			140	39.67	14.5	12
			160	45.24	16.7	13.9
20	508		10	6.35	2	1.6
		STD	20	9.53	3	2.5
		XS	30	12.7	4	3.3
			40	15.09	4.8	4
			60	20.62	6.6	5.4
			80	26.19	8.4	7
			100	32.54	10.5	8.7
			120	38.1	12.4	10.3
			140	44.45	14.6	12.1
			160	50.01	16.6	13.8
24	610		10	6.35	1.6	1.4
		STD	20	9.53	2.5	2.1
		XS		12.7	3.3	2.8
			30	14.27	3.7	3.1
			40	17.48	4.6	3.8
			60	24.61	6.5	5.4
			80	30.96	8.3	6.9
			100	38.89	10.5	8.7
			120	46.02	12.5	10.4
			140	52.37	14.3	11.9
			160	59.54	16.4	13.7

Notes

This data is intended to provide a general guide. It must not to be relied upon in the absence of competent professional advice.
These allowable internal pipe pressures were calculated by the formula given in ASME B31.3 "Process Piping", clause 304.1.2. Other design codes may give different allowable pressures. The original specifications must be consulted for full details.
Pipe with Wall Thickness greater than one-sixth of Outside Diameter is not included in this table; ASME B31.3 states that factors other than those included in the standard formula must be considered for such pipe. For pressure design of this heavy wall pipe consult the standard.
Calculations are for Grade B seamless pipe to specifications ASTM A53, ASTM A106 or API 5L. A weld join efficiency factor (typically 85%) must be allowed for standard ERW pipe, and allowance made for corrosion or wear loss if appropriate.
Conversion of carbides to graphite may occur after prolonged exposure of carbon steel pipe to temperatures above 427°C.
Allowable working pressures are given in megapascals (MPa).

Conversions to other units are..

to convert	to	multiply by
megapascals (MPa)	pounds/sg. inch (psi)	145.0
megapascals (MPa)	ksi	0.145
megapascals (MPa)	kilopascals (kPa)	1000
megapascals (MPa)	kilograms/mm² (kgf/mm²)	0.10197
megapascals (MPa)	bar	10.00

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