Submersible diameter

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by banjo bud, Nov 6, 2018.

  1. banjo bud

    banjo bud Member

    Sep 24, 2018
    South Carolina
    my well pipe is 4” sch 40. From what I found, submersible pumps are about 3-7/8” in diameter. This is only 1/16” clearance per side. How can this possibly pull 12 GPM? What am I missing here?
  2. valveman

    valveman Cary Austin Staff Member

    Mar 15, 2006
    Pump Controls Technician
    Lubbock, Texas
    There is a lot more room there than you think. I have tested and you can easily get up to 40 GPM through that opening.
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  4. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    If the 4 inch casing is steel, I think you would consider one of the slightly smaller diameter pumps, which are 3.75. These might be called Trimline, Slimline, or some such. The motor is 3.75 usually, but the pump can be bigger including the wire path.

    The steel casing can have rust that can reduce the diameter in places. So it is not a matter of passing water, but avoiding the pump from getting stuck as it gets pulled. For more margin in steel casings, the 2.9 inch "3 inch" pumps are often suggested. I passed on that, and had my old Trimline put back after my pit was demolished and a pitless adapter was installed.
  5. VAWellDriller

    VAWellDriller Active Member

    Sep 8, 2012
    Mud rotary well driller, pump installer
    Richmond, VA
    I've got plenty of 7.5HP pumps making close to 100 gpm in 4" wells....plenty of room.
    valveman likes this.
  6. greenmonster123

    greenmonster123 Member

    Nov 12, 2015
    Sag Harbor, New York
    Yes i have a handfull of 5 hp 75 gpm pumps in 4” casings that do almost 100 gpm
    valveman likes this.
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