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Thread: GPM for Centurion B128 1hp motor?

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    GPM for Centurion B128 1hp motor?

    How do I figure GPM for my motor? It's not listed on the casing and I don't have the manual. What other info do i need for the calculation, if I have to do it. thx, SR

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: GPM for Centurion B128 1hp motor?

    GPM depends on just about every detail of your plumbing. The pump pumps with a certain force, which is resisted by the friction of water flowing through the various pipe fittings. The total flow depends on the total amount of resistance encountered.

    You can get a rough estimate working from the pump model number, the pipe diameters, approximate length of pipe runs, number of pipe runs in each direction, and the clean filter pressure.

    In practice, knowing GPM isn't usually all that useful. The correct pump run time depends on how much it takes to keep the water clean, which is only roughly approximated by calculating turnovers.
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    Join Date
    Feb 2012
    Stowe, VT

    Re: GPM for Centurion B128 1hp motor?

    Well I would imagine installing a flow meter on your return pipe would be the easiest way to tell. But are you looking for what GPM you need or what GPM you have currently?

    Here's some reading on flow rate.

    maximum-flow-rates-for-pvc-pipes-t1204.html ... -size.html

    And for pump motors. ... nGuide.pdf
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