Product Manual

Friction loss tables
SQ, SQE, CU 331, and SP
22
149
Notes:
Based on Schedule 40 steel and plastic fittings.
Friction loss figures are for screwed valves and are based on equivalent lengths of steel pipe.
Friction loss table - SCH 40 PVC 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 4.1
3 180 8.7 2.2
4 240 14.8 3.7
5 300 22.2 5.7 1.8
6 360 31.2 8.0 2.5
7 420 41.5 10.6 3.3
8 480 53.0 13.5 4.2
9 540 66.0 16.8 5.2
10 600 80.5 20.4 6.3 1.7
12 720 28.6 8.9 2.3 1.1
14 840 38.0 11.8 3.1 1.4
16 960 48.6 15.1 4.0 1.9
20 1,200 60.5 22.8 6.0 2.8
25 1,500 38.7 9.1 4.3 1.3
30 1,800 12.7 6.0 1.8
35 2,100 16.9 8.0 2.4
40 2,400 21.6 10.2 3.0 1.1
45 2,700 28.0 12.5 3.8 1.4
50 3,000 15.4 4.6 1.7
60 3,600 21.6 6.4 2.3
70 4,200 28.7 8.5 3.0 1.2
80 4,800 36.8 10.9 3.8 1.4
90 5,400 45.7 13.6 4.8 1.8
100 6,000 56.6 16.5 5.7 2.2
120 7,200 23.1 8.0 3.0
140 8,400 30.6 10.5 4.0 1.1
160 9,600 39.3 13.4 5.0 1.4
200 12,000 66.3 20.1 7.6 2.1
260 15,600 32.4 12.2 3.4
300 18,000 42.1 15.8 4.4
Type of fitting and application Pipe and fitting
Nominal size of fitting and pipe
1/2" 3/4" 1" 1.25" 1.5" 2" 2.5"
Friction loss in equivalent length of straight pipe in feet
Insert coupling Plastic 3 3 3 3 3 3 3
Threaded adapter (plastic to thread) Plastic 3 3 3 3 3 3 3
90 ° standard elbow
Steel2234456
Plastic2234456
Standard tee (flow through run)
Steel1223344
Plastic1223344
Standard tee (flow through side)
Steel456781113
Plastic456781113
Gate valve Steel 1 1 1 1 2 2 2
Swing check valve Steel 5 7 9 12 13 17 21