2 Building lake fed seasonal system pressure problems

Discussion in 'Pumps and Tanks Well Forum & Blog' started by DAB, Mar 25, 2010.

  1. DAB

    DAB New Member

    Mar 24, 2010
    Ontario, Canada
    Situation : Drawing from the lake on 1 1/2" poly, 1/2 hp jet pump (don't know GPM) about 20' above surface, small (8 gallon?) pressure tank set 65/40 pushing uphill to cottage 50' away 20'higher on 1" poly, basic "T" then another 50' to the bunkie with 15' higher. each building has WC, shower, sink, kitchen sink. Water pressure is okay for one fixture use, poor at best if multiple fixtures (or one building flushes when you are in the shower in the other) more than that and water basically stops.

    I am looking at replacing the jet with a submersible.

    1. What GPM do I need? (I'm thinking 10 is lots based on fixtures).
    2. Does the pressure tank belong in front of the "T"?
    Do I need a bigger pressure tank?
    Should I move pressure tank up to the first cottage?
    Should I have 2 pressure tanks, one under each building?
    If so, is there creative valve use that would allow me to have 2 tanks and one pressure switch?
    or how would I wire 2 pressure switches?
    3. Should I increase the line size?
    If so, where?
    Between the lake and the pressure tank, or
    Between pressure tank and "T" where it splits to the bunkie?

    Oh ya - and I want it to be easy to drain for winterizing...:confused:

    Thanks for your wisdom...
  2. valveman

    valveman Moderator Staff Member

    Mar 15, 2006
    Pump Controls Technician
    Lubbock, Texas
    See answers below.

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  4. DAB

    DAB New Member

    Mar 24, 2010
    Ontario, Canada
    Thanks - now it's just execution!
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