Anyone here know the pipe details on sprinkler systems? I am going to water my new (last fall) sod yard with a new pump on my shallow well. There is plenty of water from the shallow well. I measured 15 gal/min from the old pump.
I need to install about 80-90 ft of line from the pump to the start of the sprinkler pattern. The pump is a 3/4hp wit 1 1/4 suction and 1" outlet. The pump data says it will do 16gpm

What size pvc should I use for the 80-90ft run without losing much water supplied to the far end?

I'm not a pro but have installed underground sprinklers at several of our properties over the years.
I usually run a 1" PVC Sch 40 pipe to the solenoids and then run 3/4" sch 40 pressure to the heads. I usually do all the work myself and 10' sticks of pipe is just easier for me to work with than 50-100' coils of piping...almost all the pro's around here will run 3/4" poly piping in ground around here though.
I'm just finishing up sprinklers around the house and used the 3/4" underground and have 4 Orbit gear drive sprinklers per zone and have PLENTY of pressure.

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Go with 1" minumum for the feeder run. Anything less would create too much drag/flow reduction.

1" for the run. You could knock it down to 3/4" for branch lines, but all branch lines would need to be 3/4" or you'd get uneven flow.

If it's got a 1" outlet, go with 1". You will not regret having the larger pipe if you ever want to add zones.

quote:

Originally posted by Hangtime:
Go with 1" minumum for the feeder run. Anything less would create too much drag/flow reduction.

Yes 1" minimum. I am wondering about any flow advantage of running 1.25" or even 1.5" for the 80-90ft feeder.

I have layed out and glued up public spa pipes, but I do not know anything about loss over distance. Except it happens.

quote:

Originally posted by Hamden106:

quote:

Originally posted by Hangtime:
Go with 1" minumum for the feeder run. Anything less would create too much drag/flow reduction.

Yes 1" minimum. I am wondering about any flow advantage of running 1.25" or even 1.5" for the 80-90ft feeder.

I have layed out and glued up public spa pipes, but I do not know anything about loss over distance. Except it happens.

It depends on how long the run is. BUT, 1.25" and 1.5" wouldn't hurt. Run branch lines 1-2 sizes smaller than your main line and you should have even pressure at all branch lines.

Edited to add: Here's a calculator to figure out pumping losses

http://irrigation.wsu.edu/Cont...ne-Pressure-Loss.php

This message has been edited. Last edited by: jimmy123x,