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You are here: Home > Sprinkler School > Do-It-Yourself Irrigation > Irrigation Basics 101 > Determining Pipe Size


   

It is important to use the appropriate size pipe for your flow rate. Using the correct size pipe will help keep friction low which will help to reduce pressure loss. Do not use a smaller size pipe diameter than is recommended. Although, It is ok to use a larger size pipe diameter. In certain instances sizing up can help to compensate for low pressure and or for very long pipe runs.

Pipe Material
Maximum Flow Rate
Schedule 40 PVC
4
8
13
22
30
50
Schedule 80 PVC
3
6
11
20
26
46
Polyethelene
Drip Tubing
4
240
(gph)
8
480
(gph)
13
780
(gph)



Pipe Size
RECOMMENDED
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"

Find the pipe material you have chosen and flow rate that you have calculated.
At the bottom of the chart you will find the recommended pipe size.


 
 
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