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  1. #1

    Another Cut-in Pressure Question


    New to the forum, be kind.

    Here's what I know:

    Square D switch 30-50 psi
    Bladder tank set to 28 psi (Last I checked, 1 month ago). If I remember it is 45 gallons.

    I don't know how deep the well is or what kind of pump it is. The house was built in 1991 and I am assuming the pump is original. We've owned for 7 years.

    I have a sprinkler system with 8 zones. Zone 1 & 2 are run for 10 minutes each. 3-8 are run for 5 minutes each.

    The problems:

    1. When the sprinklers run, the pump runs almost unceasingly. It can take 4-5 minutes before it hits 50psi then shuts off for maybe a minute then its on again. Actually from what I've read here that's not too big of a problem because you don't want it turning off and on a lot anyway.

    2. Bigger problem: Sometimes after running the sprinklers or the washing machine, I turn on the faucet and nothing comes out. My theory is that eventhough the pressure gauge on the water pipe says 30 psi when it's cutting in it's REALLY more like 27 or 26. Just a theory.

    How can you really measure the pressure ACCURATELY on the water pipes to be sure of the pressure? Even measuring the air on the tank is iffy with the tire gauge.

    I have a Square D Switch that has the lever on the side to start everything up again and when I do the water pressure gauge jumps up to 30 right away. It's not like going from 0 up to 30 gradually.

    I hope I've given you enough to go on here. If not ask questions.

  2. #2
    Senior Member
    Join Date
    Jun 2005
    Wherever we park the motorhome, , USA.
    You seem to be using more water than the well can provide. Stagger water uses and practice water conservation, or dig the well deeper, or have it hydrofracted if a rock bore type well or if a screened well, make sure the screen is not blocked; that's about your only solutions. All that assumes there is nothing wrong with the pump or any valves partially closed.

    Quality Water Associates
    Softener Forum

  3. #3
    Senior Member
    Join Date
    Dec 2006
    , SC, .
    When using the sprinklers you are using almost the same amount of water the pump/well can deliver, as Gary posted. Eventually you run out of water and the low pressure switch trips. When it does, no water. The switch tripping is saving your pump. When you turn it back on the pump is supplying the water pressure you are seeing.
    There is nothing wrong with a tire gauge as long as it is not a cheap .99 cent one, they are notoriously inaccurate. Get a good quality gauge.
    As for the sprinkling you may have to install a valve to regulate the amount of water. or again as Gary said to develop the well.

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