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APPENDIX IV - FRICTION LOSS TABLES
1”
Schedule 40 pipe 1.049 in. i.d. / Type L Copper tube 1.025 in. i.d.
GPM
Velocity
Ft/S
Friction Loss
Ft Hd./100’ of pipe
Velocity
Ft/S
Ft Hd./
100’ Pipe
Fric. Loss
C=130
Steel
C=100
PVC
C=140
2.0 0.74 0.60 0.32 .078 0.41
3.0 1.11 1.26 0.68 1.17 0.87
4.0 1.49 2.14 1.15 1.56 1.48
5.0 1.86 3.24 1.75 1.95 2.23
6.0 2.23 4.54 2.45 2.34 3.13
8.0 2.97 7.73 4.16 3.11 5.35
10 3.71 11.7 6.31 3.89 8.08
12 4.46 16.4 8.85 4.67 11.3
14 5.20 21.8 11.8 5.45 15.0
16 5.94 27.9 15.1 6.22 19.2
18 6.68 34.7 18.7 7.00 23.9
20 7.43 42.1 22.8 7.78 29.0
25 9.29 63.6 34.6 9.74 43.9
30 11.1 89.2 48.1 11.7 61.4
40 14.9 152 82.0 15.5 105
1.5”
Schedule 40 pipe 1.610 in. i.d. / Type L Copper tube 1.505 in. i.d.
GPM
Velocity
Ft/S
Friction Loss
Ft Hd./100’ of pipe
Velocity
Ft/S
Ft Hd./
100’ Pipe
Fric. Loss
C=130
Steel
C=100
PVC
C=140
6.0 0.95 0.57 0.31 1.08 0.49
8.0 1.26 0.96 0.52 1.44 0.82
10 1.58 1.45 0.79 1.80 1.24
12 1.89 2.04 1.10 2.16 1.73
15 2.36 2.95 1.59 2.70 2.62
20 3.15 5.24 2.83 3.60 4.46
25 3.94 7.90 4.26 4.51 6.74
30 4.73 11.1 6.00 5.41 9.44
40 6.30 18.9 10.2 7.21 16.1
50 7.88 28.5 15.4 9.01 24.3
60 9.46 40.0 21.6 10.8 34.1
70 11.0 53.2 28.7 12.6 45.5
80 12.6 68.1 36.8 14.4 58.1
90 14.2 84.7 45.7 16.2 72.1
100 15.8 103 56.6 18.0 87.7
2.5”
Schedule 40 pipe 2.469 in. i.d. / Type L Copper tube 2.465 in. i.d.
GPM
Velocity
Ft/S
Friction Loss
Ft Hd./100’ of pipe
Velocity
Ft /S
Ft Hd./
100’ Pipe
Fric. Loss
C=130
Steel
C=100
PVC
C=140
20 1.21 0.66 0.35 1.34 0.40
30 2.01 1.39 0.75 2.02 0.85
40 2.68 2.36 1.27 2.69 1.46
50 3.35 3.56 1.92 3.36 2.20
60 4.02 4.99 2.69 4.03 3.08
70 4.69 6.64 3.58 4.70 4.11
80 5.36 8.50 4.59 5.37 5.25
90 6.03 10.6 5.72 6.04 6.52
100 6.70 12.8 6.90 6.71 7.94
110 7.37 15.3 8.22 7.38 9.44
130 8.71 20.9 11.3 8.73 12.9
150 10.0 27.3 14.7 10.1 16.8
200 13.4 46.3 25.0 13.4 28.6
250 16.8 81.7 44.1 16.8 43.4
300 20.1 98.1 52.9 20.1 61.1
1¼”
Schedule 40 pipe 1.380 in. i.d. / Type L Copper tube 1.265 in. i.d.
GPM
Velocity
Ft/S
Friction Loss
Ft Hd./100’ of pipe
Velocity
Ft /S
Ft Hd./
100’ Pipe
Fric. Loss
C=130
Steel
C=100
PVC
C=140
4.0 0.86 0.56 0.30 1.02 0.52
6.0 1.29 1.20 0.65 1.53 1.12
8.0 1.72 2.04 1.10 2.04 1.92
10 2.15 3.08 1.67 2.55 2.90
12 2.57 4.31 2.33 3.06 4.04
14 2.00 5.73 3.10 3.57 5.35
16 3.43 7.34 3.96 4.08 6.85
18 3.86 9.13 4.93 4.59 8.52
20 4.29 11.1 6.00 5.10 10.4
25 5.36 16.8 9.06 6.38 15.7
30 6.43 23.5 12.7 7.65 22.1
40 8.58 40.0 21.6 10.2 37.6
50 10.7 60.4 32.6 12.8 56.7
60 12.9 84.7 45.6 15.3 79.5
80 17.2 144 77.9 20.4 136
2”
Schedule 40 pipe 2.067 in. i.d. / Type L Copper tube 1.985 in. i.d.
GPM
Velocity
Ft/S
Friction Loss
Ft Hd./100’ of pipe
Velocity
Ft/S
Ft Hd./
100’ Pipe
Fric. Loss
C=130
Steel
C=100
PVC
C=140
10 0.96 0.43 0.23 1.07 0.35
15 1.44 0.92 0.50 1.60 .075
20 1.91 1.55 0.84 2.13 1.24
25 2.39 2.35 1.27 2.66 1.87
30 2.87 3.29 1.78 3.19 2.62
40 3.82 5.60 3.03 4.26 4.48
50 4.78 8.46 4.57 5.32 6.76
60 5.74 11.9 6.44 6.39 9.47
70 6.69 15.8 8.53 7.45 12.6
80 7.65 20.2 10.9 8.52 16.2
90 8.61 25.1 13.6 9.58 20.0
100 9.56 30.5 16.5 10.7 24.4
120 11.5 42.7 23.1 12.8 34.1
150 14.3 64.7 35.0 16.0 51.6
200 19.1 110 59.4 21.3 87.8
Note: Chart shows friction loss per 100’ of pipe. To convert to friction loss per foot, move decimal point 2 places to the left.