Product Manual

Friction loss tables
SQ, SQE, CU 331, and SP
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22. Friction loss tables
Friction loss table - SCH 40 steel pipe
[US gpm] [US gph]
.5" .75" 1" 1.25" 1.5" 2" 2.5" 3" 4"
ID 0.622" ID 0.824" ID 1.049" ID 1.380" ID 1.610" ID 2.067" ID 2.469" ID 3.068" ID 4.026"
Friction loss in feet of head per 100 feet of pipe
2 120 4.8
3 180 10.0 2.5
4 240 17.1 4.2
5 300 25.8 6.3 1.9
6 360 36.5 8.9 2.7
7 420 48.7 11.8 3.6
8 480 62.7 15.0 4.5
9 540 78.3 18.8 5.7
10 600 95.9 23.0 6.9
12 720 32.6 9.6 2.5 1.2
14 840 43.5 12.8 3.3 1.5
16 960 56.3 16.5 4.2 2.0
20 1,200 86.1 25.1 6.3 2.9
25 1,500 38.7 9.6 4.5 1.3
30 1,800 54.6 13.6 6.3 1.8
35 2,100 73.3 18.2 8.4 2.4
40 2,400 95.0 23.5 10.8 3.1 1.3
45 2,700 29.4 13.5 3.9 1.6
50 3,000 36.0 16.4 4.7 1.9
60 3,600 51.0 23.2 6.6 2.7
70 4,200 68.8 31.3 8.9 3.6 1.2
80 4,800 89.2 40.5 11.4 4.6 1.6
90 5,400 51.0 14.2 5.8 2.0
100 6,000 62.2 17.4 7.1 2.4
120 7,200 24.7 10.1 3.4
140 8,400 33.2 13.5 4.5 1.2
160 9,600 43.0 17.5 5.8 1.5
200 12,000 66.3 27.0 8.9 2.3
260 15,600 45.0 14.8 3.7
300 18,000 59.6 19.5 4.9