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

Discussion in 'Irrigation / Sprinkler Forum' started by Travis11, Jul 17, 2019.

  1. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    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!
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    What does your pressure gauge indicate during these events?
     
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  4. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    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
     
  5. greenmonster123

    greenmonster123 Member

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    Location:
    Sag Harbor, New York
    Sounds like you might be drawing down the well
     
  6. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    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.
     
  7. greenmonster123

    greenmonster123 Member

    Joined:
    Nov 12, 2015
    Location:
    Sag Harbor, New York
    How long do you have to wait to have good pressure again? And how big is your pressure tank
     
  8. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    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.
     
  9. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    This is it appears to be a 2ish gal
     

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  10. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    What does the pressure in the house do while you are running the sprinklers? Drops to 50 and holds steady?
     
  11. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    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..
     
  12. greenmonster123

    greenmonster123 Member

    Joined:
    Nov 12, 2015
    Location:
    Sag Harbor, New York
    How many gpm does the system use?
     
  13. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    I have no idea. Sorry I'm not knowledgable at all when it comes to this area.
     
  14. Travis11

    Travis11 New Member

    Joined:
    Jul 16, 2019
    Location:
    Michigan
    I do know all last year sprinklers worked great all of the time. Strong powerful flow.
     
  15. Joe green

    Joe green New Member

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    May 26, 2020
    Location:
    New jersey
    Hi did you ever fix this problem .i have this problem do uhavecnyadvice thanks
     
  16. Alternatlert

    Alternatlert New Member

    Joined:
    May 27, 2020
    Location:
    Toronto
    Hi! Please, share here the results of solving your problem? Did you fix it? If yes, please, tell me how you did it?
     
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