1. emoque

    emoque New Member

    Jul 26, 2010
    Asheville, NC
    Our 400 foot well has a 1 hp pump at 340 feet, with a static water depth of 300 feet; information from five years ago. Anyway, we had a new pump put in 4 years ago from a 1.5 hp to a 1hp, recently it began switching on and off. It's under warranty so the contractor came out and diagnosed it to be a pump that is overheating. The cause is left to be determined...either lightning, a bad pressure tank or too much iron in the water.

    Question: We are now deciding if we should replace the pump with what was originally placed in the well, which was a 1.5 hp or a 1 hp. We have talked to many "experts" and researched on-line, but still need to make a decision about the strength. If we do go with a 1 hp, what should the GPM be and psi's. We are thinking of a 1 hp, with 10 gpm...but not sure of the psi's. Can you help?
  2. valveman

    valveman Cary Austin Staff Member

    Mar 15, 2006
    Pump Controls Technician
    Lubbock, Texas
    A 1 HP, 10 GPM pump, lifting from 300', can only produce 38 PSI. From 340' it can only produce 21 PSI. If it was a 1 HP, 10 GPM pump, it probably overheated because it couldn't build up to 40 or 50 and shut off. If it is a 1 HP, 7 GPM pump. it will produce about 6 GPM and can build enough pressure to shut itself off. A 1.5 HP, 10 GPM pump will deliver about 12 GPM from 300' and 40 PSI, and can shut itself off.
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  4. jimtum

    jimtum AAW

    Aug 27, 2010
    Water Treatment Specialist
    Decatur Tx
    Valveman is right either use a 1 hp 7 pgm or a 1.5 hp pump. I would recommend the 1.5 since most well guys carry them on their trucks and you can have water more quickly if you ever need to replace it instead of having to wait to get a 1 hp 7 gpm.
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