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Maximum Dripper Line Runs
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Star-Tip 1022 |
Gardening Tips for successful and beautiful Landscapes and Gardens |
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Maximum run of 1/4" feeder tubing or 1/2" (.600 ID) drip hose with PC Emitter |
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Flow Deviation 7% |
Dripper spacing in feet on 1/4" distribution tubing |
Dripper spacing in feet on 1/2" poly tube |
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Products |
Flow rates |
1' |
2' |
3' |
4' |
5' |
1' |
2' |
3' |
4' |
5' |
|
PC Emitter |
1 gph |
35 |
50 |
72 |
88 |
105 |
320 |
530 |
670 |
820 |
970 |
|
PC Emitter |
2 gph |
25 |
36 |
45 |
56 |
65 |
190 |
310 |
420 |
510 |
610 |
|
PC Emitter |
4 gph |
14 |
22 |
30 |
36 |
40 |
120 |
200 |
250 |
320 |
450 |
Maintaining Pressure in your Drip System
When making decisions about how many drips (emitters) you can have in one zone, and then how to lay these drips out, you need to take into consideration “loss of pressure” through the valve, and across the supply and feeder lines. If you begin with a regulated 20 lb. pressure, you can not afford to lose more than 5 lbs. before the end emitter and expect to have reliable water supply. You can lose as much as 6 psi at your control valve. If you use an in-line pressure regulator, the loss of pressure from the valve is not relevant.
First; Your ˝ inch supply line
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GPH |
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10' |
20' |
50' |
100' |
200' |
300' |
400' |
500' |
600' |
700' |
800' |
900' |
|
120 |
|
0.2 |
0.4 |
0.9 |
1.8 |
3.6 |
5.4 |
7.2 |
9.0 5.4 |
10.8 |
5.4 |
7.2 |
16.2 |
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180 |
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0.4 |
0.8 |
2.0 |
3.9 |
7.8 |
13.7 |
15.6 |
19.5 |
23.4 |
27.3 |
31.2 |
35.1 |
|
240 |
|
0.7 |
1.3 |
3.4 |
6.7 |
13.4 |
20.1 |
26.8 |
33.5 |
40.2 |
46.9 |
53.6 |
60.3 |
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300 |
|
1.0 |
2.0 |
5.1 |
10.1 |
20.2 |
30.3 |
40.4 |
50.5 |
60.6 |
70.7 |
80.8 |
90.9 |
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360 |
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1.4 |
2.8 |
7.1 |
14.1 |
28.2 |
42.3 |
56.4 |
70.5 |
84.6 |
98.7 |
112.8 |
126.9 |
Next; Your 1/4 “ Feeder line
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GPH |
2' |
4' |
10' |
20' |
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10 |
0.3 |
0.6 |
1.5 |
3.0 |
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20 |
1.0 |
2.0 |
5.0 |
10.0 |
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30 |
2.1 |
4.2 |
10.5 |
21.0 |
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40 |
3.7 |
7.4 |
18.5 |
37.0 |
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50 |
5.5 |
11.0 |
27.5 |
55.0 |
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Pressure loss (psi) on 1/4" feeder tube with 1 gph emitter |
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Number of emitters |
Feeder length in feet |
Pressure loss in psi |
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1 |
3 |
0.02 |
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5 |
15 |
0.65 |
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10 |
30 |
5.46** |
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15 |
45 |
17.31* |
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* Not recommended ** Not recommended with 20 regulator |
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Due to the typical complexity of most irrigation designs, simple charts showing how many feet you can run 1/4 “ feeder line with emitters at various spacing may (or may not) not be useful. A chart is provided below.
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Maximum run of 1/4" feeder tubing and 1/2" (.600 ID) supply hose with PC emitters |
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Flow Deviation ≈ 7% |
Emitter spacing in feet on 1/4" feeder tubing |
Emitter spacing in feet on 1/2" supply poly tubing |
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|
Products |
Flow rates |
1' |
2' |
3' |
4' |
5' |
1' |
2' |
3' |
4' |
5' |
|
PC Emitter |
1 gph |
35 |
50 |
72 |
88 |
105 |
320 |
530 |
670 |
820 |
970 |
|
PC Emitter |
2 gph |
25 |
36 |
45 |
56 |
65 |
190 |
310 |
420 |
510 |
610 |
|
PC Emitter |
4 gph |
14 |
22 |
30 |
36 |
40 |
120 |
200 |
250 |
320 |
450 |
© 2007, Star Nursery, Inc.
Copy provided courtesy Star Nursery
www.StarNursery.com
Nevada Gardens
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