Good pressure for 30 minutes, then drops off

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by kkrepcik, Aug 9, 2011.

  1. kkrepcik

    kkrepcik New Member

    Aug 9, 2011
    Deer Park, WA
    I have a well that was drilled to 160' with a water level of about 80'. It pulled over 20gpm when drilled. I put in a sprinkler system several years ago, no problem with water pressure (4gpm total per zone). 2 years ago or so, I put in an extra pressure tank for water storage mainly (to keep pump from cycling so much).

    I started having issues with good pressure for 10 minutes of continuous running water (sprinklers), then the pressure would drop to about 14-16psi with the pump running. Shut off sprinklers and the pressure would go back to normal. I took out the other pressure tank (started right after I put it in). Still an issue, replaced the pressure switch, and replaced tank to a 80 gallon tank in the last month. It has gotten better (30-35 minutes before drop off).

    1.5hp sub pump
    Well pump height is about 140'
    1" main into house, about 50 feet from house
    When no water usage, pressure stays at a constant pressure (system leaks)
    I don't have any problem with air coming thru my system (pump cavitation)

    Any help out there before I call the Pump guys?

    Last edited by a moderator: Aug 9, 2011
  2. valveman

    valveman Cary Austin Staff Member

    Mar 15, 2006
    Pump Controls Technician
    Lubbock, Texas
    Calling the pump guys to lower the pump to 158' might help. If it doesn't you should call a preacher because it sounds like you are pumping the well off.
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