STEEL PIPE DATA - METRIC
U.S. Nom. Size, in.	Nom. Size, mm.	Schedule*	Wall Thkns t, mm	Inside Diam. d, in.	Surface Area		Cross Section		Mass		Working Pressure*** ASTM A53 B to 200°
					Outside, m²/m	Inside, m²/m	Metal Area, mm²	Flow Area, mm²	Pipe, kg/m	Water, kg/m	Mfr. Process	Joint Type**	kPa (gage)
1/4	8	40ST	2.24	9.25	0.043	0.029	80.6	67.1	0.631	0.067	CW	T	1296
		80XS	3.02	7.67	0.043	0.024	101.5	46.2	0.796	0.046	CW	T	6006
3/8	10	40ST	2.31	12.52	0.054	0.039	107.7	123.2	0.844	0.123	CW	T	1400
		80XS	3.20	10.74	0.054	0.034	140.2	90.7	1.098	0.091	CW	T	5654
1/2	15	40ST	2.77	15.80	0.067	0.050	161.5	196.0	1.265	0.196	CW	T	1476
		80XS	3.73	13.87	0.067	0.044	206.5	151.1	1.618	0.151	CW	T	5192
3/4	20	40ST	2.87	20.93	0.084	0.066	214.6	344.0	1.68	0.344	CW	T	1496
		80XS	3.91	18.85	0.084	0.059	279.7	279.0	2.19	0.279	CW	T	4695
1	25	40ST	3.38	26.64	0.105	0.084	318.6	557.6	2.50	0.558	CW	T	1558
		80XS	4.55	24.31	0.105	0.076	412.1	464.1	3.23	0.464	CW	T	4427
1-1/4	32	40ST	3.56	35.05	0.132	0.110	431.3	965.0	3.38	0.965	CW	T	1579
		80XS	4.85	32.46	0.132	0.102	568.7	827.6	4.45	0.828	CW	T	4096
1-1/2	40	40ST	3.68	40.89	0.152	0.128	515.5	1313	4.05	1.313	CW	T	1593
		80XS	5.08	38.10	0.152	0.120	689.0	1140	5.40	1.140	CW	T	3972
2	50	40ST	3.91	52.50	0.190	0.165	690.3	2165	5.43	2.165	CW	T	1586
		80XS	5.54	49.25	0.190	0.155	953	1905	7.47	1.905	CW	T	3799
2-1/2	65	40ST	5.16	62.71	0.229	0.197	1099	3089	8.62	3.089	CW	W	3675
		80XS	7.01	59.00	0.229	0.185	1454	2734	11.40	2.734	CW	W	5757
3	80	40ST	5.49	77.93	0.279	0.245	1438	4769	11.27	4.769	CW	W	3323
		80XS	7.62	73.66	0.279	0.231	1946	4261	15.25	4.261	CW	W	5288
4	100	40ST	6.02	102.26	0.359	0.321	2048	8213	16.04	8.213	CW	W	2965
		80XS	8.56	97.18	0.359	0.305	2844	7417	22.28	7.417	CW	W	4792
6	150	40ST	7.11	154.05	0.529	0.484	3601	18639	28.22	18.64	ERW	W	4799
		80XS	10.97	146.33	0.529	0.460	5423	16817	42.49	16.82	ERW	W	8336
8	200	30	7.04	205.0	0.688	0.644	4687	33000	36.73	33.01	ERW	W	3627
		40ST	8.18	202.7	0.688	0.637	5419	32280	42.46	32.28	ERW	W	4433
		80XS	12.70	193.7	0.688	0.608	8234	29460	64.51	29.46	ERW	W	7626
10	250	30	7.80	257.5	0.858	0.809	6498	52060	50.91	52.06	ERW	W	3344
		40ST	9.27	254.5	0.858	0.800	7683	50870	60.20	50.87	ERW	W	4178
		XS	12.70	247.7	0.858	0.778	10388	48170	81.39	48.17	ERW	W	6116
		80	15.06	242.9	0.858	0.763	12208	46350	95.66	46.35	ERW	W	7453
12	300	30	8.38	307.1	1.017	0.965	8307	74060	65.09	74.06	ERW	W	3096
		ST	9.53	304.8	1.017	0.958	9406	72970	73.70	72.97	ERW	W	3641
		40	10.31	303.2	1.017	0.953	10158	72190	79.59	72.21	ERW	W	4020
		XS	12.70	298.5	1.017	0.938	12414	69940	97.28	69.96	ERW	W	5157
		80	17.45	289.0	1.017	0.908	16797	65550	131.62	65.57	ERW	W	7419
14	350	30ST	9.53	336.6	1.117	1.057	10356	88970	81.15	88.96	ERW	W	3316
		40	11.10	333.4	1.117	1.047	12013	87290	94.13	87.30	ERW	W	3999
		XS	12.70	330.2	1.117	1.037	13681	85610	107.21	85.63	ERW	W	4695
		80	19.05	317.5	1.117	0.997	20142	79160	157.82	79.17	ERW	W	7453
16	400	30ST	9.53	387.4	1.277	1.217	11876	117800	93.06	117.8	ERW	W	2903
		40XS	12.70	381.0	1.277	1.197	15708	114000	123.09	114.0	ERW	W	4109
18	450	ST	9.53	438.2	1.436	1.376	13396	150800	104.98	150.8	ERW	W	2579
		30	11.10	435.0	1.436	1.367	15556	148600	121.90	148.6	ERW	W	3110
		XS	12.70	431.8	1.436	1.357	17735	146450	138.97	146.4	ERW	W	3654
		40	14.27	428.7	1.436	1.347	19863	144300	155.65	144.3	ERW	W	4185
20	500	20ST	9.53	489.0	1.596	1.536	14916	187700	116.88	187.4	ERW	W	2324
		30XS	12.70	482.6	1.596	1.516	19762	182900	154.85	182.9	ERW	W	3289
		40	15.06	477.9	1.596	1.501	23325	179400	182.78	179.4	ERW	W	4006

Notes:
*Numbers are schedule numbers per ASME Standard B36. 10M; ST=Extra Strong
**T=Thread; W=Weld
***Working pressures were calculated per ASME B31.9 using furnace butt-weld (continuous weld, CW) pipe through 100 mm and electric resistance weld (ERW) thereafter. The allowance A has been taken as:
1)12.5% of t for mill tolerance on pipe wall thickness, plus
2)An arbitrary corrosion allowance of 0.64 mm for pipe sizes through NPS 2 and 1.65 mm from NPS 2½ through 20, plus
3) A thread cutting allowance for sizes through NPS 2
Because the pipe wall thickness of threaded standard pipe is so small after deducting the allowance A, the mechanical strength of the pipe is impaired. It is good practice to limit standard threaded pipe pressure to 620 kPa (gage) for steam and 860 kPa (gage) for water.

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