Water Flow and Velocity Head in Steel Pipes - Schedule 40

Velocity head used to calculate minor pressure or head loss in fluid flow systems

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Velocity Head in the table below can be used to calculate the minor loss in schedule 40 steel pipes with water flow. Major and minor loss must be summarized for calculating the total head loss in the system.

1 ft (foot) = 0.3048 m

Flow (gal/min)	1 1/4"		1 1/2"		2"
Flow (gal/min)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)
3	0.64	0.006
4	0.86	0.011
5	1.07	0.018
6	1.29	0.026	0.95	0.010	0.57	0.005
7	1.50	0.035	1.10	0.014	0.67	0.007
8	1.72	0.046	1.26	0.019	0.77	0.009
9	1.93	0.058	1.42	0.025	0.86	0.012
10	2.15	0.072	1.58	0.031	0.96	0.014
12	2.57	0.103	1.89	0.056	1.15	0.021
14	3.0	0.140	2.21	0.076	1.34	0.028
16	3.43	0.183	2.52	0.099	1.53	0.036
18	3.86	0.232	2.84	0.125	1.72	0.046
20	4.29	0.286	3.15	0.154	1.91	0.057
22	4.72	0.346	3.47	0.187	2.10	0.069
24	5.15	0.412	3.78	0.222	2.29	0.082
26	5.58	0.483	4.10	0.261	2.49	0.096
28	6.01	0.561	4.41	0.303	2.68	0.111
30	6.44	0.644	4.73	0.347	2.87	0.128
35	7.51	0.877	5.52	0.472	3.35	0.174
40	8.58	1.14	6.30	0.618	3.87	0.227
45	9.65	1.44	7.09	0.782	4.30	0.288
50	10.7	1.79	7.88	0.965	4.78	0.355
55	11.8	2.16	8.67	1.17	5.26	0.430
60	12.9	2.57	9.46	1.39	5.74	0.511
65	13.9	3.02	10.24	1.63	6.21	0.600
70	15.0	3.50	11.03	1.89	6.69	0.696
75	16.1	4.02	11.8	2.17	7.17	0.799
80	17.2	4.58	12.6	2.47	7.65	0.909
85	18.2	5.17	13.4	2.79	8.13	1.03
90	19.3	5.79	14.2	3.13	8.60	1.15
95			15.0	3.48	9.08	1.28
100			15.8	3.86	9.56	1.42
120					11.5	2.05
140					13.4	2.78
160					15.3	3.64
180					17.2	4.60
200					19.1	5.68

1 ft (foot) = 0.3048 m

Flow (gal/min)	2 1/2"		3"		4"
Flow (gal/min)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)
14	0.94	0.014
16	10.7	0.018
18	1.21	0.023
20	1.34	0.028
22	1.47	0.034	0.95	0.026	0.55	0.005
24	1.61	0.040	1.04	0.036	0.60	0.006
26	1.74	0.047	1.13	0.047	0.66	0.007
28	1.88	0.055	1.22	0.059	0.71	0.008
30	2.01	0.063	1.3	0.073	0.76	0.009
35	2.35	0.086	1.52	0.089	0.88	0.012
40	2.68	0.112	1.74	0.105	1.01	0.016
45	3.02	0.141	1.95	0.124	1.14	0.020
50	3.35	0.174	2.17	0.143	1.26	0.025
55	3.69	0.211	2.39	0.165	1.39	0.030
60	4.02	0.251	2.6	0.187	1.51	0.036
65	4.36	0.295	2.82	0.211	1.64	0.042
70	4.69	0.342	3.04	0.237	1.76	0.048
75	5.03	0.393	3.25	0.264	1.89	0.056
80	5.36	0.447	3.47	0.293	2.02	0.063
85	5.70	0.504	3.69	0.354	2.15	0.071
90	6.03	0.565	3.91	0.421	2.27	0.080
95	6.37	0.630	4.12	0.495	2.40	0.089
100	6.70	0.698	4.34	0.574	2.52	0.099
110	7.37	0.844	4.77	0.659	2.77	0.119
120	8.04	1.00	5.21	0.749	3.02	0.142
130	8.71	1.18	5.64	0.846	3.28	0.167
140	9.38	1.37	6.08	0.948	3.53	0.193
150	10.05	1.57	6.51	1.06	3.78	0.22
160	10.7	1.79	6.94	1.17	4.03	0.253
170	11.4	2.02	7.38	1.42	4.28	0.285
180	12.1	2.26	7.81	1.69	4.54	0.320
190	12.7	2.52	8.25	1.98	4.79	0.356
200	13.4	2.79	8.68	2.29	5.04	0.395
220	14.7	3.38	9.55	2.63	5.54	0.478
240	16.1	4.02	10.4	3.0	6.05	0.569
260	17.4	4.72	11.3	3.38	6.55	0.667
280	18.8	5.47	12.2	3.79	7.06	0.774
300	20.1	6.28	13.0	4.23	7.56	0.888
320			13.9	4.68	8.06	1.01
340					8.57	1.14
360					9.07	1.28
380					9.58	1.43
400					10.1	1.58
420					10.6	1.74
440					11.1	1.91
460					11.6	20.9
480					12.1	2.27
500					12.6	2.47
550					13.9	2.99
600					15.1	3.55
650					16.4	4.17
700					17.6	4.84

1 ft (foot) = 0.3048 m

Flow (gal/min)	5"		6"		8"
Flow (gal/min)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)	Velocity - v - (ft/s)	Velocity Head - v²/2g - (ft)
40	0.64	0.006	0.44	0.003	0.26	0.001
50	0.80	0.010	0.56	0.005	0.32	0.002
60	0.96	0.014	0.67	0.007	0.39	0.002
70	1.12	0.020	0.78	0.009	0.45	0.003
80	1.28	0.026	0.89	0.012	0.51	0.004
90	1.44	0.032	1.0	0.016	0.58	0.005
100	1.60	0.040	1.11	0.019	0.67	0.006
120	1.92	0.058	1.33	0.028	0.77	0.009
140	2.25	0.078	1.55	0.038	0.90	0.013
160	2.57	0.102	1.78	0.049	1.03	0.016
180	2.89	0.129	2.0	0.062	1.15	0.021
200	3.21	0.160	2.22	0.077	1.28	0.026
220	3.53	0.193	2.44	0.093	1.41	0.031
240	3.85	0.230	2.66	0.110	1.54	0.037
260	4.17	0.270	2.89	0.130	1.67	0.043
280	4.49	0.313	3.11	0.150	1.80	0.050
300	4.81	0.360	3.33	0.172	1.92	0.058
320	5.13	0.409	3.55	0.196	2.05	0.066
340	5.45	0.462	3.78	0.222	2.18	0.074
360	5.77	0.518	4.0	0.240	2.31	0.083
380	6.09	0.577	4.22	0.277	2.44	0.092
400	6.41	0.639	4.44	0.307	2.57	0.102
420	6.74	0.705	4.66	0.338	2.7	0.113
440	7.06	0.774	4.89	0.371	2.83	0.124
460	7.38	0.846	5.11	0.405	2.96	0.135
480	7.7	0.921	5.33	0.442	3.08	0.147
500	8.02	1.0	5.55	0.479	3.21	0.160
550	8.82	1.21	6.11	0.580	3.53	0.193
600	9.62	1.44	6.66	0.690	3.85	0.230
650	10.4	1.69	7.22	0.810	4.17	0.271
700	11.2	1.96	7.77	0.939	4.49	0.313
750	12.0	2.25	8.33	1.08	4.81	0.360
800	12.8	2.56	8.88	1.23	5.13	0.409
850	13.6	2.89	9.44	1.38	5.45	0.462
900	14.4	3.24	9.99	1.55	5.77	0.518
950	15.2	3.61	10.5	1.73	6.09	0.577
1000	16.0	4.0	11.1	1.92	6.41	0.639
1100	17.6	4.84	12.2	2.32	7.05	0.773
1200	19.2	5.76	13.3	2.76	7.70	0.920
1300	20.8	6.75	14.4	3.24	8.34	1.08
1400	22.5	7.83	15.5	3.76	8.98	1.25
1500	24.1	8.99	16.7	4.31	9.62	1.44
1600	25.7	10.2	17.8	4.91	10.3	1.64
1700	27.3	11.6	18.9	5.54	10.9	1.85
1800	28.8	12.9	20.0	6.21	11.5	2.07
1900	30.5	14.4	21.1	6.92	12.2	2.31
2000	32.1	16.0	22.2	7.67	12.8	2.56
2200			24.4	9.27	14.1	3.09
2400			26.6	11.1	15.4	3.68
2600					16.7	4.32
2800					18.0	5.01
3000					19.2	5.75

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