Sprinkler pressure starts fine for a couple minutes, then loses pressure

[Travis11]

Hi all, hoping to find some sort of guidance. My sprinkler system is a year old underground rain bird system that covers 17000 sq ft with 8 zones. When I turn a zone on the pressure and flow are great. A couple minutes into the cycle the zone will lose some pressure and have a bad flow. This will continue until there is barely a flow. When the pressure drops my backflow pressure valve spits water out of the top. If I turn it off and start another cycle the same thing happens. Great pressure for a few minutes, and then it loses it. I am on well water with a constant pressure system. Any guidance is appreciated!

 

[Reach4]

I am on well water with a constant pressure system.

What does your pressure gauge indicate during these events?

 

[Sponsor]

 

[Travis11]

What does your pressure gauge indicate during these events?

My pressure gauge is set at 60 psi. When the sprinklers start running it sits around 50/55 psi. After a few minutes when the pressure drops the psi drops and pulsates 20-40ish psi

 

[Greenmonster123]

Sounds like you might be drawing down the well

 

[Travis11]

Sounds like you might be drawing down the well

Yup they are coming to pull the pump tomorrow. Well and sprinklers are 1/1.5 year old on a new construction. Will see what they say tomorrow.

 

[Greenmonster123]

How long do you have to wait to have good pressure again? And how big is your pressure tank

 

[Travis11]

How long do you have to wait to have good pressure again? And how big is your pressure tank

The pressure inside the house is fine. Even after sprinkler pressure drops if I turn them off pressure in house returns almost in seconds to 60psi. I have a constant pressure system. So not sure if well casing is cracked or what is going on.

 

[Travis11]

This is it appears to be a 2ish gal

 

[Reach4]

The pressure inside the house is fine. Even after sprinkler pressure drops if I turn them off pressure in house returns almost in seconds to 60psi.

What does the pressure in the house do while you are running the sprinklers? Drops to 50 and holds steady?

 

[Travis11]

What does the pressure in the house do while you are running the sprinklers? Drops to 50 and holds steady?

Yes for the first 10 minutes, then the pressure in sprinklers drops as well as in house and pulsates around 25psi +-2psi. So no i guess when sprinkler pressure dies so does house pressure. As soon as I shut sprinklers off all returns to 60..

 

[Greenmonster123]

How many gpm does the system use?

 

[Travis11]

How many gpm does the system use?

I have no idea. Sorry I'm not knowledgable at all when it comes to this area.

 

[Travis11]

How many gpm does the system use?

I do know all last year sprinklers worked great all of the time. Strong powerful flow.

 

[Joe green]

Hi did you ever fix this problem .i have this problem do uhavecnyadvice thanks

 

[Alternatlert]

Hi all, hoping to find some sort of guidance. My sprinkler system is a year old underground rain bird system that covers 17000 sq ft with 8 zones. When I turn a zone on the pressure and flow are great. A couple minutes into the cycle the zone will lose some pressure and have a bad flow. This will continue until there is barely a flow. When the pressure drops my backflow pressure valve spits water out of the top. If I turn it off and start another cycle the same thing happens. Great pressure for a few minutes, and then it loses it. I am on well water with a constant pressure system. Any guidance is appreciated!

Hi! Please, share here the results of solving your problem? Did you fix it? If yes, please, tell me how you did it?