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How To Size Pipe for Solar Water Pumping

Use this chart to size the correct diameter pipe for your solar water pumping system. Areas shaded in red should be selected with caution.

Water Pip Sizing Chart

Friction Loss in Plastic Pipe with Standard Inside Diameter (SIDR)

This chart applies only to: PVC pipe, Schedule 40 (160PSI) and to PE (polyethylene) pipe with SIDR designation (most common 100PSI black pipe)

Head loss in vertical feet per hundred feet of pipe or vertical meters per hundred meters of pipe

Nominal Pipe Diameter (in) / Actual Inside Diameter (in)
FLOW RATE
1/2*
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
5
6
GPM
LPM
0.662
0.82
1.05
1.38
1.61
2.07
2.47
3.07
4.03
5.05
6.06
1
3.8
1.13 0.14 0.05 0.02
2
7.6
4.16 0.35 0.14 0.05 0.02
3
11
8.55 2.19 0.32 0.09 0.05
4
15
14.8 3.70 0.76 0.19 0.07
5
19
22.2 5.78 0.81 0.25 0.12 0.04
6
23
31.0 7.85 1.00 0.35 0.18 0.07 0.02
7
27
10.6 1.52 0.46 0.23 0.08 0.03
8
30
13.4 1.94 0.58 0.30 0.09 0.05
9
34
16.9 2.43 0.72 0.37 0.12 0.06
10
36
20.3 2.93 0.88 0.46 0.16 0.07 0.02
11
42
24.3 3.51 1.04 0.53 0.18 0.08 0.03
12
46
28.6 4.11 1.22 0.65 0.21 0.09 0.04
14
53
5.47 1.64 0.85 0.28 0.12 0.05
16
61
7.02 2.10 1.09 0.37 0.14 0.06
18
68
8.73 2.61 1.34 0.46 0.16 0.07
20
76
10.6 3.16 1.64 0.55 0.21 0.08 0.02
22
83
13.3 3.79 1.96 0.67 0.25 0.09 0.03
24
91
14.9 4.44 2.31 0.79 0.30 0.11 0.04
26
99
5.15 2.66 0.90 0.35 0.14 0.05
28
106
5.91 3.05 1.04 0.42 0.16 0.05
30
114
6.72 3.46 1.18 0.46 0.18 0.06
35
133
8.94 4.62 1.57 0.62 0.23 0.07
40
152
11.0 5.91 1.99 0.79 0.30 0.09 0.02
45
171
14.2 7.37 2.49 0.97 0.37 0.12

0.04

50
190
17.3 8.96 3.03 1.20 0.46 0.14 0.05
55
208
10.7 3.60 1.43 0.55 0.16 0.06
60
227
12.5 4.23 1.66 0.65 0.18 0.07 0.02
65
246
14.5 4.90 1.94 0.74 0.22 0.08 0.03
70
265
16.7 5.64 2.22 0.85 0.25 0.09 0.04
75
284
19.0 6.40 2.52 0.97 0.28 0.10 0.05
80
303
7.31 2.84 1.09 0.32 0.12 0.06
85
322
8.06 3.19 1.22 0.37 0.13 0.07
90
341
8.96 3.62 1.36 0.39 0.14 0.08
95
360
9.91 3.90 1.50 0.44 0.016 0.09
100
379
10.9 4.30 1.66 0.49 0.18 0.12
150
569

23.1

9.10 3.51 1.04 0.37 0.16
200
758
15.5 5.98 1.76 0.62 0.28
NOTE: Values shaded in
are at velocies over 5ft per second and should be selected with caution.
* The 1/2" data applies only to PE. PVC has a smaller internal diameter of 0.612
 

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