Test of actual PSI and GPM - instead of trying to calculate. - Design Issues - SPRINKLER TALK FORUM

Test of actual PSI and GPM - instead of trying to calculate.

wsommariva

Supreme Member

Posts: 332

Location: Northern New Jersey

Wednesday, January 4th 2012, 12:54pm

Test of actual PSI and GPM - instead of trying to calculate.

For example, I run a 1" PE line out 200 feet from a 1" valve. This is the furthest away that my last head will be in a zone that will have four heads. If I have psi of 32 and gpm of 6 for example, I can use heads that will use 1.5 gpm at psi of 30. Correct?

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Wet_Boots

Supreme Member

Posts: 4,102

Location: Metro NYC

Wednesday, January 4th 2012, 2:55pm

Why aren't you using pressure loss tables to work this out?

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wsommariva

Supreme Member

Posts: 332

Location: Northern New Jersey

Wednesday, January 4th 2012, 2:58pm

I did but I thought that actual would be much better.

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Wet_Boots

Supreme Member

Posts: 4,102

Location: Metro NYC

Wednesday, January 4th 2012, 6:55pm

If you want to build it first, and see if it works second, you got company. :huh:

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wsommariva

Supreme Member

Posts: 332

Location: Northern New Jersey

Thursday, January 5th 2012, 8:49am

Won't happen. I ask so many questions it's bound to work.

My calculations say I end up with 33 psi. I won't install heads until I know what I'm really dealing with. I'll hook up my 200+ feet of PE, run it to the area and test actual. Then I'll dig the trenches install PE and whatever heads will work with what I have.

So, is my actual testing method valid?