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Thread: wide swings in pressure

  1. #1
    Newbie
    Join Date
    Nov 2008
    Location
    North Carolina.
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    wide swings in pressure

    My system is a deep well submersible (150 ft), 1 hp pump, bladder tank, pressure switch (40-60 with one adjustment spring) and typical residential plumbing. My tank, filter and pressure switch are in a mechanical room in the basement. I have changed the pressure switch twice. I have changed the filter and have checked the precharge on the bladder. When a draw down occurs the pressure goes to 20 or below before the contact close then the pressure goes to 85-95 before the contacts open. This happened also with my pumptrol switch which I got so out of adjustment tinkering with it that my only recourse was to change it out. I tried to adjust the new switch with the one adjustment but only moved it one turn to see what changed. Nothing changed so I moved it back. I am at a loss as to what may be causing this. Welcome any advice. Thanks.

  2. #2
    Senior Member
    Join Date
    Dec 2006
    Location
    , SC, .
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    First check that your gauge is reading properly, most are pretty cheaply made and I have seen some off by more that 20#.
    Make sure there are no check valves in the system. A valve that is not opening properly can cause the problem.
    What kind of filter? Take it out of the system and see what happens.
    Your tank pressure empty should be around 38# air pressure.

  3. #3
    Pump guy speedbump's Avatar
    Join Date
    Jun 2005
    Location
    Murphy, NC. USA.
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    11,786
    I have thoughts.

    One, what kind of filter do you have and where is it located?

    Two, the tube that the pressure switch is hooked to can be plugged so bad that it actually impedes the pressure trying to get to the switch.

    bob...

    Products and Pricing

  4. #4
    Newbie
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    Nov 2008
    Location
    North Carolina.
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    Thanks so much for the input. The problem was not in the pipe nipple to the switch but was in the brass tee coming off the bottom of the tank. Once I cleared all the built up and hardened sludge out of the tee, recharged the tank and replaced the gage the system started up and worked as it should. I simply had to raise the pressure 5#s or so to get to the pressure we desired which was cut in at 42 psi and cut out at 62 psi. Thanks again. charliet1945.

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