Pressure Loss in a Schedule 40 Steel Pipe

Water flow and pressure loss in a schedule 40 steel pipe - gallons per minute, liters per second and cubic meters per hour

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The table below can be used to estimate pressure loss for water flow through a schedule 40 steel pipe.

Note! 1 lb/in² (psi) = 6894.8 Pa (N/m²). Convert to other pressure loss units with the unit converter.

Pressure Loss (lb/in², psi)
Flow			Pipe Size (inches)
Flow			1 "			1 1/4 "			1 1/2 "			2 "
US Gal/min	liter/s	m3/h	Velocity		Pressure drop	1 1/4 "
			ft/s	m/s	lb/in² per 1000 ft	Velocity		Pressure drop
1	0.06	0.23	0.37	0.11	0.49	ft/s	m/s	lb/in² per 1000 ft	Velocity		Pressure drop
2	0.13	0.45	0.74	0.23	1.7	0.43	0.13	0.05	ft/s	m/s	lb/in² per 1000 ft
3	0.19	0.68	1.12	0.34	3.53	0.64	0.2	0.94	0.47	0.14	0.44
4	0.25	0.91	1.49	0.45	5.94	0.86	0.26	1.55	0.63	0.19	0.74	Velocity		Pressure drop
5	0.32	1.14	1.86	0.57	9.02	1.07	0.33	2.36	0.79	0.24	1.12	ft/s	m/s	lb/in² per 1000 ft
6	0.38	1.36	2.24	0.68	12.25	1.28	0.39	3.3	0.95	0.29	1.53	0.57	0.17	0.46
8	0.5	1.82	2.98	0.91	21.1	1.72	0.52	5.52	1.26	0.38	2.63	0.76	0.23	0.75
10	0.63	2.27	3.72	1.13	30.8	2.14	0.65	8.34	1.57	0.48	3.86	0.96	0.29	1.14
15	0.95	3.41	5.6	1.71	64.6	3.21	0.98	17.6	2.36	0.72	8.13	1.43	0.44	2.33
20	1.26	4.54	7.44	2.27	110.5	4.29	1.31	29.1	3.15	0.96	13.5	1.91	0.58	3.86
25	1.58	5.68				5.36	1.63	43.7	3.94	1.2	20.2	2.39	0.73	5.81
30	1.89	6.81				6.43	1.96	62.9	4.72	1.44	29.1	2.87	0.87	8.04
35	2.21	7.95				7.51	2.29	82.5	5.51	1.68	38.2	3.35	1.02	10.95
40	2.52	9.08							6.3	1.92	47.8	3.82	1.16	13.7
45	2.84	10.22							7.08	2.16	60.6	4.3	1.31	17.4
50	3.15	11.36							7.87	2.4	74.7	4.78	1.46	20.6
60	3.79	13.63										5.74	1.75	29.6
70	4.42	15.9										6.69	2.04	38.6
80	5.05	18.17										7.65	2.33	50.3
90	5.68	20.44										8.6	2.62	63.6
100	6.31	22.71										9.56	2.91	75.1

Pressure Loss and Head Loss due to Friction in Ducts and Tubes - Major loss - head loss or pressure loss - due to friction in pipes and ducts.

Pressure Loss (lb/in², psi)
Flow			Pipe Size (inches)
Flow			2 1/2"			3"			3 1/2"			4"			5"
US Gal/min	liter/s	m3/h
5	0.32	1.14
6	0.38	1.36	Velocity		Pressure drop
8	0.5	1.82	ft/s	m/s	lb/in² per 1000 ft
10	0.63	2.27	0.67	0.2	0.48	Velocity		Pressure drop
15	0.95	3.41	1	0.3	0.99	ft/s	m/s	lb/in² per 1000 ft	Velocity		Pressure drop
20	1.26	4.54	1.34	0.41	1.64	0.87	0.27	0.59	ft/s	m/s	lb/in² per 1000 ft
25	1.58	5.68	1.68	0.51	2.48	1.08	0.33	0.67	0.81	0.25	0.42	Velocity		Pressure drop
30	1.89	6.81	2.01	0.61	3.43	1.3	0.4	1.21	0.97	0.3	0.6	ft/s	m/s	lb/in² per 1000 ft
35	2.21	7.95	2.35	0.72	4.49	1.52	0.46	1.58	1.14	0.35	0.79	0.88	0.27	0.42
40	2.52	9.08	2.68	0.82	5.88	1.74	0.53	2.06	1.3	0.4	1	1.01	0.31	0.53
45	2.84	10.22	3	0.91	7.14	1.95	0.59	2.51	1.46	0.45	1.21	1.13	0.34	0.67
50	3.15	11.36	3.35	1.02	8.82	2.17	0.66	3.1	1.62	0.49	1.44	1.26	0.38	0.8	Velocity		Pressure drop
60	3.79	13.63	4.02	1.23	12.2	2.6	0.79	4.29	1.95	0.59	2.07	1.51	0.46	1.1	ft/s	m/s	lb/in² per 1000 ft
70	4.42	15.9	4.69	1.43	15.3	3.04	0.93	5.84	2.27	0.69	2.71	1.76	0.54	1.5	1.12	0.34	0.48
80	5.05	18.17	5.37	1.64	21.7	3.48	1.06	7.62	2.59	0.79	3.53	2.01	0.61	1.87	1.28	0.39	0.63
90	5.68	20.44	6.04	1.84	26.1	3.91	1.19	9.22	2.92	0.89	4.46	2.26	0.69	2.37	1.44	0.44	0.8
100	6.31	22.71	6.71	2.05	32.3	4.34	1.32	11.4	3.24	0.99	5.27	2.52	0.77	2.81	1.6	0.49	0.95
125	7.89	28.39	8.38	2.55	48.2	5.42	1.65	17.1	4.05	1.23	7.86	3.15	0.96	4.38	2	0.61	1.48
150	9.46	34.07	10.06	3.07	60.4	6.51	1.98	23.5	4.85	1.48	11.3	3.78	1.15	6.02	2.41	0.73	2.04
175	11.04	39.74	11.73	3.58	90	7.59	2.31	32	5.67	1.73	14.7	4.41	1.34	8.2	2.81	0.86	2.78
200	12.62	45.42				8.68	2.65	39.7	6.48	1.98	19.2	5.04	1.54	10.2	3.21	0.98	3.46
225	14.19	51.1				9.77	2.98	50.2	7.29	2.22	23.1	5.67	1.73	12.9	3.61	1.1	4.37
250	15.77	56.78				10.85	3.31	61.9	8.1	2.47	28.5	6.3	1.92	15.9	4.01	1.22	5.14
275	17.35	62.45				11.94	3.64	75	8.91	2.72	34.4	6.93	2.11	18.3	4.41	1.34	6.22
300	18.93	68.13				13.02	3.97	84.7	9.72	2.96	40.9	7.56	2.3	21.8	4.81	1.47	7.41
325	20.5	73.81							10.53	3.21	45.5	8.18	2.49	25.5	5.21	1.59	8.25
350	22.08	79.49							11.35	3.46	52.7	8.82	2.69	29.7	5.61	1.71	9.57
375	23.66	85.16							12.17	3.71	60.7	9.45	2.88	32.3	6.01	1.83	11
400	25.23	90.84							12.97	3.95	68.9	10.08	3.07	36.7	6.41	1.95	12.5
425	26.81	96.52							13.78	4.2	77.8	10.7	3.26	41.5	6.82	2.08	14.1
450	28.39	102.2							14.59	4.45	87.3	11.33	3.45	46.5	7.22	2.2	15
475	29.96	107.87										11.96	3.65	51.7	7.62	2.32	16.7
500	31.54	113.55										12.59	3.84	57.3	8.02	2.44	18.5
550	34.7	124.91										13.84	4.22	69.3	8.82	2.69	22.4
600	37.85	136.26										15.1	4.6	82.5	9.62	2.93	26.7
650	41	147.62													10.42	3.18	3103
700	44.16	158.97													11.22	3.42	36.3
750	47.31	170.33													12.02	3.66	41.6
800	50.47	181.68													12.82	3.91	44.7
850	53.62	193.04													13.62	4.15	50.5
900	56.78	204.39													14.42	4.4	56.6
950	59.93	215.75													15.22	4.64	63.1
1000	63.08	227.1													16.02	4.88	70
1100	69.39	249.81													17.63	5.37	84.6

Pressure Loss ( lb/in², psi)
Flow			Pipe Size (inches)
Flow			6 "			8 "			10 "			12 "
US Gal/min	liter/s	m3/h
70	4.42	15.9
80	5.05	18.17	Velocity		Pressure drop
90	5.68	20.44	ft/s	m/s	lb/in² per 1000 ft
100	6.31	22.71	1.11	0.34	0.39
125	7.89	28.39	1.39	0.42	0.56
150	9.46	34.07	1.67	0.51	0.78
175	11.04	39.74	1.94	0.59	1.01	Velocity		Pressure drop
200	12.62	45.42	2.22	0.68	1.32	ft/s	m/s	lb/in² per 1000 ft
225	14.19	51.1	2.5	0.76	1.66	1.44	0.44	0.44
250	15.77	56.78	2.78	0.85	2.05	1.6	0.49	0.55
275	17.35	62.45	3.06	0.93	2.36	1.76	0.54	0.63
300	18.93	68.13	3.3	1.01	2.8	1.92	0.59	0.75
325	20.5	73.81	3.61	1.1	3.29	2.08	0.63	0.88
350	22.08	79.49	3.89	1.19	3.62	2.24	0.68	0.97
375	23.66	85.16	4.16	1.27	4.16	2.4	0.73	1.11
400	25.23	90.84	4.44	1.35	4.72	2.56	0.78	1.27
425	26.81	96.52	4.72	1.44	5.34	2.72	0.83	1.43	Velocity		Pressure drop
450	28.39	102.2	5	1.52	5.96	2.88	0.88	1.6	ft/s	m/s	lb/in2 per 1000 ft
475	29.96	107.87	5.27	1.61	6.66	3.04	0.93	1.69	1.93	0.59	0.3
500	31.54	113.55	5.55	1.69	7.39	3.2	0.98	1.87	2.04	0.62	0.63
550	34.7	124.91	6.11	1.86	8.94	3.53	1.08	2.26	2.24	0.68	0.7
600	37.85	136.26	6.66	2.03	10.6	3.85	1.17	2.7	2.44	0.74	0.86	Velocity		Pressure drop
650	41	147.62	7.21	2.2	11.8	4.17	1.27	3.16	2.65	0.81	1.01	ft/s	m/s	lb/in2 per 1000 ft
700	44.16	158.97	7.77	2.37	13.7	4.49	1.37	3.69	2.85	0.87	1.18	2.01	0.61	0.48
750	47.31	170.33	8.32	2.54	15.7	4.81	1.47	4.21	3.05	0.93	1.35	2.15	0.66	0.55
800	50.47	181.68	8.88	2.71	17.8	5.13	1.56	4.79	3.26	0.99	1.54	2.29	0.7	0.62
850	53.62	193.04	9.44	2.88	20.2	5.45	1.66	5.11	3.46	1.05	1.74	2.44	0.74	0.7
900	56.78	204.39	10	3.05	22.6	5.77	1.76	5.73	3.66	1.12	1.94	2.58	0.79	0.79
950	59.93	215.75	10.55	3.22	23.7	6.09	1.86	6.38	3.87	1.18	2.23	2.72	0.83	0.88
1000	63.08	227.1	11.1	3.38	26.3	6.41	1.95	7.08	4.07	1.24	2.4	2.87	0.87	0.98
1100	69.39	249.81	12.22	3.72	31.8	7.05	2.15	8.56	4.48	1.37	2.74	3.16	0.96	1.18
1200	75.7	272.52	13.32	4.06	37.8	7.69	2.34	10.2	4.88	1.49	3.27	3.45	1.05	1.4
1300	82.01	295.23	14.43	4.4	44.4	8.33	2.54	11.3	5.29	1.61	3.86	3.73	1.14	1.56
1400	88.32	317.94	15.54	4.74	51.5	8.97	2.73	13	5.7	1.74	4.44	4.02	1.23	1.8
1500	94.63	340.65	16.65	5.07	55.5	9.62	2.93	15	6.1	1.86	5.11	4.3	1.31	2.07
1600	100.93	363.36	17.76	5.41	63.1	10.26	3.13	17	6.51	1.98	5.46	4.59	1.4	2.36
1800	113.55	408.78	19.98	6.09	79.8	11.54	3.52	21.6	7.32	2.23	6.91	5.16	1.57	2.98
2000	126.17	454.2	22.2	6.77	98.5	12.83	3.91	25	8.13	2.48	8.54	5.73	1.75	3.47
2500	157.71	567.75				16.03	4.89	39	10.18	3.1	12.5	7.17	2.19	5.41
3000	189.25	681.3				19.24	5.86	52.4	12.21	3.72	18	8.6	2.62	7.31
3500	220.79	794.85				22.43	6.84	71.4	14.25	4.34	22.9	10.03	3.06	9.95
4000	252.33	908.4				25.65	7.82	93.3	16.28	4.96	29.9	11.48	3.5	13
4500	283.88	1021.95							18.31	5.58	37.8	12.9	3.93	15.4
5000	315.42	1135.5							20.35	6.2	46.7	14.34	4.37	18.9
6000	378.5	1362.6							24.42	7.44	67.2	17.21	5.25	27.3
7000	441.58	1589.7							28.5	8.69	85.1	20.8	6.34	37.2
8000	504.67	1816.8										22.95	7	45.1
9000	567.75	2043.9										25.8	7.86	57
10000	630.83	2271										28.63	8.73	70.4
12000	757	2725.2										34.38	10.48	93.6

Pressure Loss ( lb/in², psi)
Flow			Pipe Size (inches)
Flow			14 "			16 "			18 "			20 "			24 "
US Gal/min	liter/s	m3/h
700	44.16	158.97
750	47.31	170.33	Velocity		Pressure drop
800	50.47	181.68	ft/s	m/s	lb/in² per 1000 ft
850	53.62	193.04	2.02	0.62	0.43
900	56.78	204.39	2.14	0.65	0.48
950	59.93	215.75	2.25	0.69	0.53
1000	63.08	227.1	2.38	0.73	0.59	Velocity		Pressure drop
1100	69.39	249.81	2.61	0.8	0.68	ft/s	m/s	lb/in² per 1000 ft
1200	75.7	272.52	2.85	0.87	0.81	2.18	0.66	0.4
1300	82.01	295.23	3.09	0.94	0.95	2.36	0.72	0.47
1400	88.32	317.94	3.32	1.01	1.1	2.54	0.77	0.54
1500	94.63	340.65	3.55	1.08	1.19	2.73	0.83	0.62	Velocity		Pressure drop
1600	100.93	363.36	3.8	1.16	1.35	2.91	0.89	0.71	ft/s	m/s	lb/in² per 1000 ft
1800	113.55	408.78	4.27	1.3	1.71	3.27	1	0.85	2.58	0.79	0.48
2000	126.17	454.2	4.74	1.44	2.11	3.63	1.11	1.05	2.88	0.88	0.56	Velocity		Pressure drop
2500	157.71	567.75	5.92	1.8	3.09	4.54	1.38	1.63	3.59	1.09	0.88	ft/s	m/s	lb/in² per 1000 ft
3000	189.25	681.3	7.12	2.17	4.45	5.45	1.66	2.21	4.31	1.31	1.27	3.45	1.05	0.73	Velocity		Pressure drop
3500	220.79	794.85	8.32	2.54	6.18	6.35	1.94	3	5.03	1.53	1.52	4.03	1.23	0.94	ft/s	m/s	lb/in² per 1000 ft
4000	252.33	908.4	9.49	2.89	7.92	7.25	2.21	3.92	5.74	1.75	2.12	4.61	1.41	1.22	3.19	0.97	0.51
4500	283.88	1021.95	10.67	3.25	9.36	8.17	2.49	4.97	6.47	1.97	2.5	5.19	1.58	1.55	3.59	1.09	0.6
5000	315.42	1135.5	11.84	3.61	11.6	9.08	2.77	5.72	7.17	2.19	3.08	5.76	1.76	1.78	3.99	1.22	0.74
6000	378.5	1362.6	14.32	4.36	15.4	10.88	3.32	8.24	8.62	2.63	4.45	6.92	2.11	2.57	4.8	1.46	1
7000	441.58	1589.7	16.6	5.06	21	12.69	3.87	12.2	10.04	3.06	6.06	8.06	2.46	3.5	5.68	1.73	1.36
8000	504.67	1816.8	18.98	5.79	27.4	14.52	4.43	13.6	11.48	3.5	7.34	9.23	2.81	4.57	6.38	1.94	1.78
9000	567.75	2043.9	21.35	6.51	34.7	16.32	4.97	17.2	12.92	3.94	9.2	10.37	3.16	5.36	7.19	2.19	2.25
10000	630.83	2271	23.75	7.24	42.9	18.16	5.54	21.2	14.37	4.38	11.5	11.53	3.51	6.63	7.96	2.43	2.78
12000	757	2725.2	28.5	8.69	61.8	21.8	6.64	30.9	17.23	5.25	16.5	13.83	4.22	9.54	9.57	2.92	3.71
14000	883.17	3179.4	33.2	10.12	84	25.42	7.75	41.6	20.1	6.13	20.7	16.14	4.92	12	11.18	3.41	5.05
16000	1009.33	3633.6				29.05	8.85	54.4	22.96	7	27.1	18.43	5.62	15.7	12.77	3.89	6.6

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