Pause in water pressure

Discussion in 'Pumps and Tanks Well Forum & Blog' started by KDickinson, May 2, 2012.

  1. KDickinson

    KDickinson New Member

    Messages:
    3
    Location:
    Ottawa, Canada
    Hi,
    I have a submersible pump and your typical currently available pressure tank with a bladder or rubber liner. The pressure seems good and the well is good, but every 5-6 minutes when the water is running it dries up to trickle and then kicks in again back to normal pressure. The dropping and resurgence only lasts about 10 seconds but is a real pain. I have one pressure gauge which is on the line from the well and prior to the pressure tank. This isn't an abrupt situation, it has been a slow progression over the last year or so. Is this a simple pressure cut off adjustment?

    Kim
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,185
    Location:
    NW Ontario, Canada
    It could be that the air precharge is too high so the tank runs out of reserve before the pump comes on. It could also be a failing pressure switch whereby mineral build-up under the diaphragm is causing the pump to start at progressively lower pressure.
  3. KDickinson

    KDickinson New Member

    Messages:
    3
    Location:
    Ottawa, Canada
    Ok, so if it's the air precharge how do I adjust that? So getting a new switch would solve the second possible issue?
  4. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,185
    Location:
    NW Ontario, Canada
    There are stickies for replacing a switch and maintaining the bladder tank.
  5. KDickinson

    KDickinson New Member

    Messages:
    3
    Location:
    Ottawa, Canada
    What are average life spans of switches and bladder/captive air tanks?
  6. craigpump

    craigpump Well-Known Member

    Messages:
    1,083
    Location:
    ct
    Shut the power off to your pump, drain the tank, and then check the air pressure in the tank at the air charge valve. The air charge should be 2 psi below cut in pressure, for example if your system operates on a 40/60 pressure differential you should have 38 psi on the tank.
    I have seen good bladder tanks last 25+ years. I replace pressure switches every 5 years and I always use a brass nipple under the pressure switch. Be sure there is a pressure relief valve in the system!
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