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Friction Loss Flow Chart


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Feet Of Head Pressure Loss Per 100 Ft. of Plastic Pipe
GPM Pipe Diameter
1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4" 5"
1 2.08 0.51                
2 4.16 1.02 0.55 0.14 0.07          
5 23.44 5.73 1.72 0.44 0.22 0.066 0.038 0.015    
7 43.06 10.52 3.17 0.81 0.38 0.11 0.051 0.021    
10 82.02 20.04 6.02 1.55 0.72 0.21 0.09 0.03    
15   42.46 12.77 3.28 1.53 0.45 0.19 0.07    
20   72.34 21.75 5.59 2.61 0.76 0.32 0.11 0.03  
25     32.88 8.45 3.95 1.15 0.49 0.17 0.04  
30     46.08 11.85 5.53 1.62 0.68 0.23 0.06 0.02
35       15.76 7.36 2.15 0.91 0.31 0.08 0.03
40       20.18 9.43 2.75 1.16 0.40 0.11 0.03
45       25.10 11.73 3.43 1.44 0.50 0.13 0.04
50       30.51 14.25 4.16 1.75 0.60 0.16 0.05
60         19.98 5.84 2.46 0.85 0.22 0.07
70           7.76 3.27 1.13 0.30 0.10
75           8.82 3.71 1.28 0.34 0.11
80           9.94 4.19 1.44 0.38 0.13
90           12.37 5.21 1.80 0.47 0.16
100           15.03 6.33 2.18 0.58 0.19
125             9.58 3.31 0.88 0.29
150             13.41 4.63 1.22 0.40
175               6.16 1.63 0.54
200               7.88 2.08 0.69
250               11.93 3.15 1.05
300                 4.41 1.46
350                 5.87 1.95
400                 7.52 2.49
450                   3.09
500                   3.76
Example Use: 1" pipe, with 5 GPM would lose 1.72 feet of head pressure per hundred feet

Friction Loss in PVC Fittings = EQUIVALENT FEET OF STRAIGHT PIPE
PVC
Type		 Pipe Size
1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"
90° elbow 1.5 2.0 2.25 4.0 4.0 6.0 8.0 8.0 12.0
45° elbow 0.75 1.0 1.4 1.75 2.0 2.5 3.0 4.0 5.0
insert coupling 0.5 0.75 1.0 1.25 1.5 2.0 3.0 3.0 4.0
gate valve 0.3 0.4 0.6 0.8 1.0 1.5 1.6 2.0 3.0
male/female adapter 1.0 1.5 2.0 2.75 3.5 4.5 5.5 6.5 9.5
tee-flow (run) 1.0 1.4 1.7 2.3 2.7 4.3 5.1 6.3 8.3
tee-flow (branch) 4.0 5.0 6.0 7.0 8.0 12.0 15.0 16.0 22.0

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