FRICTION FLOW

Schedule 40 Rigid PVC Pipe

3/4 in. pipe 1 in. pipe 1-1/4 in. pipe 1-1/2 in. pipe 2 in. pipe 2-1/2 in. pipe 3 in. pipe 4 in. pipe 5 in. pipe 6 in. pipe
U.S.
Gal.per
min.
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in feet
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in
feet
Velocity
feet per
second
Loss
in
feet
U.S Gal Per min.
1 0.71 0.4 0.4 0.1 0.26 0.03 1
2 1.43 1.44 0.8 0.35 0.51 0.12 0.36 0.05 2
3 2.14 3.05 1.2 0.75 0.77 0.25 0.53 0.103 3
4 2.85 5.19 1.6 1.28 1.03 0.43 0.71 0.18 4
5 3.56 7.85 2 1.94 1.28 0.65 0.89 0.27 0.5 0.07 0.32 0.02 0.22 0.01 5
6 4.28 11.01 2.41 2.71 1.54 0.92 1.07 0.38 0.6 0.09 0.38 0.03 0.27 0.01 6
8 5.7 18.75 3.21 4.62 2.05 1.56 1.43 0.64 0.8 0.16 0.51 0.05 0.36 0.02 8
10 7.13 28.34 4.01 6.99 2.57 2.36 1.78 0.97 1 0.24 0.64 0.08 0.45 0.03 10
15 10.69 60.06 6.01 14.81 3.85 5 2.67 2.06 1.5 0.51 0.96 0.17 0.67 0.07 15
20 8.02 25.24 5.13 8.52 3.56 3.51 2 0.87 1.28 0.29 0.89 0.12 0.5 0.03 20
25 10.02 38.16 6.41 12.88 4.45 5.31 2.51 1.31 1.6 0.44 1.11 0.18 0.63 0.04 25
30 12.03 53.48 7.7 18.06 5.34 7.44 3.01 1.83 1.92 0.62 1.34 0.26 0.75 0.06 0.48 0.02 30
35 8.98 24.03 6.24 9.89 3.51 2.44 2.24 0.82 1.56 0.34 0.88 0.08 0.56 0.03 35
40 10.26 30.77 7.13 12.67 4.01 3.13 2.57 1.06 1.78 0.43 1 0.11 0.64 0.04 40
45 11.54 38.27 8.02 15.76 4.51 3.89 2.89 1.31 2 0.54 1.13 0.13 0.72 0.05 45
50 12.83 46.51 8.91 19.16 5.01 4.72 3.21 1.6 2.23 0.66 1.25 0.16 0.8 0.05 0.56 0.02 50
60 10.69 26.85 6.01 6.62 3.85 2.24 2.67 0.92 1.5 0.23 0.96 0.08 0.67 0.03 60
70 7.01 8.81 4.49 2.98 3.12 1.23 1.75 0.3 1.12 0.1 0.78 0.04 70
80 8.02 11.28 5.13 3.81 3.56 1.57 2 0.39 1028 0.13 0.89 0.05 80
90 9.02 14.03 5.77 4.74 4.01 1.95 2.25 0.48 1.44 0.16 1 0.07 90
100 10.02 17.06 6.41 5.76 4.45 2.37 2.51 0.59 1.6 0.2 1.11 0.08 100
125 8.02 8.71 5.57 3.59 3.13 0.88 2 0.3 1.39 0.12 125
150 9.62 12.2 6.68 5.03 3.76 1.24 2.41 0.42 1.67 0.17 150
175 7.79 6.69 4.38 1.65 2.81 0.56 1.95 0.23 175
200 8.91 8.56 5.01 2.11 3.21 0.71 2.23 0.29 200
225 10.02 10.65 5.64 2.63 3.61 0.89 2.51 0.37 225
250 11.13 12.95 6.26 3.19 4.01 1.08 2.78 0.44 250
275 6.89 3.81 4.41 1.29 3.06 0.53 275
300 7.52 4.48 4.81 1.51 3.34 0.62 300
325 8.14 5.19 5.21 1.75 3.62 0.72 325
350 8.77 5.95 5.61 2.01 3.9 0.83 35
375 9.39 6.77 6.01 2.28 4.18 0.94 375
400 10.02 7.63 6.41 2.57 4.45 1.06 400
425 6.81 2.88 4.73 1.19 425
450 7.22 3.2 5.01 1.32 450
475 7.62 3.54 5.29 1.46 475
500 6.02 3.89 5.57 1.6 500
550 8.82 4.64 6.12 1.91 550
600 9.62 5.46 6.68 2.25 600
650 7.24 2.61 650
700 7.79 2.99 700
750 8.35 3.4 750
1000 11.13 5.79 1000

Note

* Friction loss of water in feet per 100 feet length of pipe. Based on Williams & Hazen formula using constant 150.
* Recommended operating flow velocities indicated by boxed areas.

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