Pressure trouble with sprinklers

Discussion in 'Irrigation' started by mfurey14, May 10, 2013.

  1. mfurey14

    mfurey14 LawnSite Member
    Messages: 1

    I'm having some trouble with pressure in one my sprinkler zones and I was hoping someone here would be able to help me out. I have 4 zones with Orbit pop up heads on them supplied by a 1 hp Goulds well pump. Zones 1,3, and 4 all work normally and operate around 25 psi. The pump pressure is set up at 40/60. I've replaced the expansion tank, the pressure gauge, the pressure switch, and some of the PVC pipes on the supply side of the pump and the pipes coming right out of the pump. The reason everything looks brown and rusty is because the old expansion tank was leaking and spraying rusty water everywhere. Once zone 2 comes on the pressure drops to about 5 psi and water only comes out of the sprinkler heads in that zone about 5 ft. All heads operate normally and pop up and down fine. My father in law thought it might be the solenoid for that zone, so I replaced it with a brand new one, but it didn't help. The next thing we thought was there's most likely a leak in the line, however I have a city water spigot right next to one of the spigots I have hooked up to the well (I have 5 other spigots hooked up to the well around the house). Normally I just used the city water and hook a hose up from that spigot to the one right next to it for the well pump to prime it. So I thought I'd try and have the city water hooked up this time with zone 2 on and see how it works. When I did that the sprinklers worked like normal at about 25 psi. So because of that I feel like there's not a leak in the line, otherwise even with the city water going through the pump, if there was a leak it still wouldn't work (I would think). Does anyone have any ideas of what could be causing the loss of pressure? I just bought this house last year and this well was already here so I don't know the history of it, I just know the pump is a Goulds J10S. Not sure if it'll help, but I'll post a picture of my pump. I'm also new to all this irrigation stuff and don't know a whole lot of the lingo, so if you could explain anything in easier terms for me to understand I would really appreciate it. Thanks!

  2. greenmonster304

    greenmonster304 LawnSite Gold Member
    Messages: 3,690

    Maybe you have a suction leak or the impelar is toasted. With all that rust it could have clogged up the finns on the impeller. I had that happen on a submersible.
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  3. londonrain

    londonrain LawnSite Silver Member
    Messages: 2,129

    How many heads on each zone and the GPM of each head. With that pump you might get 7-8GPM if lucky... the deeper the suction/lift the less you will get.
  4. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,358

    I am with Londonrain. I would suspect the demand of the zone exceeds supply. The city supply runs the zone while the well won't.
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  5. Stillwater

    Stillwater LawnSite Platinum Member
    Messages: 4,889

    It's only one zone with the issue?... And the Zone works properly when connected to town supply? Well then gee wiz..... I would check the components you are bypassing when you connect to the city supply
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