With option of constant pressurized mainline or pump relay, which would be preferred

Discussion in 'Irrigation' started by enorl76, Jun 11, 2014.

  1. enorl76

    enorl76 LawnSite Member
    Male, from Orlando, FL
    Posts: 135

    So I have this large residential system, we're just about to finish things out.

    3" mainline thats about 700ft long with about 15ft elevation change from end to beginning.

    We have a 3HP Sta-rite DHG pumping water. Its turned on via pump relay. I'm guessing the internal check valve on the pump is allowing some leakage down because it takes a long time to fill up the mainline (being 3" and X cuft of water) and so forth. Periodically theres a 2" threaded tee that supplies 2x Hunter 2" PGV valves and the irrigation zone

    Should I put in a pressure switch (with small tank) instead and keep the mainline pressurized, or let it be non-pressurized while the system isnt running.

    What's your thoughts, professionals?
     
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,302

    You could start by installing your own check valve(s) on the pump. I think the old sta-rite check design was just a leather flap.
     
  3. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,304

    Find and fix the leak(s)
    Posted via Mobile Device
     
  4. enorl76

    enorl76 LawnSite Member
    Male, from Orlando, FL
    Posts: 135

    You are correct, its just a leather flap.

    We're pulling from a lake, I will install a checkvalve right on the inlet.
     
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,302

    If the water was really cruddy, you could even consider a check on the outlet on the theory that the water could be filtered enough to keep it from fouling a check valve.
     

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