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  1. flowman

    fixing an inducer to combat cavitation in pump

    Rotaryeqpt, An inducer stage is designed for very low npshr, it basically feeds the npshr of the stages above it. It is an invalueable tool when the npsha is low such as a condensate pump. It also allows you to shorten condensate pump and barrel. Johnston's Q-model's are inducers I'm not...
  2. flowman

    High Volume Low Head Pump

    25362, Johnston Pump carries a line pumps that fit this condition. johnston-pump.com Best Of Luck, Flowman
  3. flowman

    bearing adjustment of pump

    First step, measure the bearing fit areas, both sides should have .0015 diametric clearances on the OD. All three bearings should have .0003- .0005 press to the shaft. After this is verified you’ll be ready to assemble. With the lid off drop the rotating element in place. Center the...
  4. flowman

    Direction of Thrust.

    poppeye, You must have qty. 2, Thrust Bearings. If you have a cross-sectional of the pump you will probably notice the bearings are installed face to face or back to back. This allows for thrust abillity in either direction. Typically you will want only .005 lateral movment of the bearings in...
  5. flowman

    Pump

    Why are you running your pumps @ 50% capacity ? If you look @ your curve you will find pressure increases as capacity decreases, this increases thrust. Your pump is seeing more thrust than the balance drum was designed for. Your curve should show a thrust constant, that you can calculate the...
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