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valovic

New Member

1

Saturday, January 12th 2013, 6:29pm

1.25" sprinkler design but I want to drop to 1"

OK so I have been planning on instaling my own sprinkler system, and I'm just about to rent the trencher. I had rainbird design the system, and they did an OK job. I have to redesign a few things over. One question is - they would not design my system for a 1" line, they said with my flow and PSI that they had to size it for 1.25", but that I could reduce it after they designed it with no problem. I've got 50 psi and 30 gpm on right from the 1" main line. They have designed a zone to have 10 heads or the 5000 series per zone. They said it was not safe to design a residential system with 30 gpm on a 1" line. I don't understand why it is unsafe. Anyone see an issue with me putting 10 rotor heads on all 1" lines with my pressure and flow?
I can send the design if you want to see it.
valovic has attached the following file:

Wet_Boots

Supreme Member

Posts: 4,025

Location: Metro NYC

2

Saturday, January 12th 2013, 8:37pm

I'll Rainbird one better and flatly state that 30 gpm is 1-1/2 inch territory, both for mainline and zone valves.

wsommariva

Supreme Member

Posts: 332

Location: Northern New Jersey

3

Sunday, January 13th 2013, 7:10am

30 gpm? Good for you.

valovic

New Member

4

Thursday, January 17th 2013, 6:21pm

redesign

I went back to rainbird and they redesigned it a bit. They now have the main lines and lateral lines as 1-1/4. I'll just stick with that

Wet_Boots

Supreme Member

Posts: 4,025

Location: Metro NYC

5

Friday, January 18th 2013, 1:40pm

In general, you do not want pressure losses in a system's main line, so you don't skimp on that point. Also, the flow of 30 gpm is beyond the usual operating range of one-inch zone valves, so for the sake of maximum economy, system flows would be kept to 20 gpm or less.

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