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Water Flow and Velocity Head in Schedule 40 Steel Pipes

Velocity head is 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.

Flow
(gal/min)		 1 1/4" 1 1/2" 2"
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

Flow
(gal/min)		 2 1/2" 3" 4"
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

Flow
(gal/min)		 5" 6" 8"
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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