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Thursday, July 24th 2014, 9:25am

Pipe Sizine

Getting ready to add irrigation to the entrance of my property, about 900' from the house. I am on a well with about 18gpm @ 50psi (at the house). I had planned on running 1 1/4" sch40 PVC to the entrance (will need 4 zones). Any idea on the psi loss? 40 psi is about the minimum on the HUNTER PGP heads that I use.


Supreme Member

Posts: 5,203

Location: Metro NYC


Thursday, July 24th 2014, 10:45am

Unless you can adjust your pressure switch to have the pump cut-off at 70 psi or so, you are going to have to oversize this 900-foot line in order to save pressure for the heads to run near to 40 psi from a 50 psi supply. Holding the loss to around 2 psi at 18 gpm would require a 2-inch pipe size, compared to a loss of 16 psi if you used a 1-1/4 sch 40 PVC line (your material choice will depend on your location)

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