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kn2540

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1

Friday, July 24th 2015, 3:11pm

Newbie question on sprinkler irrigation/pump design

I'm a newbie on irrigation/water pump design but I have been
doing a lot of research whether it stick is another question.


I have a rain catchment system with 3000 gal holding tank and
here is my plan. Please give me your feedback and advice.


The pump will be next to the holding tank at the same elevation.

From the jet pump I plan on running 1 1/2" PVC
schedule 20 100' to the sprinkler manifold.


From the sprinkler manifold I will probably have 4 zones.
My farest zone run is about 100' from the manifold to the
sprinkler head using 3/4 PVC schedule 20 with 6 rotor sprinkler head requiring
40 PSI @ 3GPM.


Elevation from the pump to the sprinkler head is max 3' high.

6 sprinkler *3GMP = 18GPM so a 1hp jet pump should be more than
enough power to handle it.


I plan on using a Gould 1hp jet pump model J10S.

When I read thru the thread I keep seeing pressure tank. Do I
need a pressure tank for this application?


I was assuming I can just hook the water pump to a pump start relay and let the sprinkler controller activate
the pump.


Is this doable or do I still need a pressure tank?
Any advice is appreciated..

Wet_Boots

Supreme Member

Posts: 5,277

Location: Metro NYC

2

Friday, July 24th 2015, 4:30pm

The pump already comes with a pressure switch wired to the motor, and a baby pressure tank costs about the same as a pump relay. The pressure switch protects the pump. You don't have to worry about what happens if a zone valve fails to open, or if a valve wire gets cut.

kn2540

Unregistered

3

Friday, July 24th 2015, 8:33pm

Newbie question on sprinkler irrigation/pump design

The pump already comes with a pressure switch wired to the motor, and a baby pressure tank costs about the same as a pump relay. The pressure switch protects the pump. You don't have to worry about what happens if a zone valve fails to open, or if a valve wire gets cut.
Ok, I feel stupid now but what is the purpose of the baby tank use for?

Wet_Boots

Supreme Member

Posts: 5,277

Location: Metro NYC

4

Friday, July 24th 2015, 8:46pm

Always a pressure tank with a pressure switch. Period.

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