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Thread: Reference or calculator for sizing of suction pipe

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    Reference or calculator for sizing of suction pipe

    I am trying to figure of what intake hose sizing I may need to a pump that pumps at much higher flow rates than normal pool pumps. The pump is to be used to basically empty the pump, such as a gasoline powered water pump. I may need to run a long length of suction hose to accomplish what I am trying to do. So, is there a simple online calculator to do this? I assume this is the sort of calculation that is done all the time in calculating total dynamic head. I do not want to create cavitation and I do not want to unnecessarily use a larger diameter suction hose than what is necessary. Thanks.

    Del

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    mas985's Avatar
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    Re: Reference or calculator for sizing of suction pipe

    There are head loss tables such as the one in the Hydraulics 101 sticky or this one: PVC Pipes - Friction Loss and Flow Velocities Schedule 40

    But none that I know of will suggest a pipe size. If you can give some more details, I might be able to help.

    Does the pump have specs which dictate how much suction head it can support?

    Make/Model of pump?

    Distance you are trying to pump?

    Approximately flow rates (GPM)?

    Vertical lift (ft)?

    What type of pipe are you planing to use (e.g. schedule 40 PVC)?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Reference or calculator for sizing of suction pipe

    For example, lets assume that I want to pump 666 gallons per minute. Let's further assume that I use a gasoline powered pump that can pump this much, as I do not have anything specific in mind yet. Let's also assume that it will need to be pumped up a 5 foot elevation and the length of the suction pipe is 100 feet long. If you need to plug and chug some diameters, then 4 inch ID would be a starting point. You can also run it at 6 inch ID if 4 inches fails. Thanks, and I will look up the references you provided.

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    mas985's Avatar
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    Re: Reference or calculator for sizing of suction pipe

    Without detailed knowledge of the pump it is just guesswork but you would need 6" pipe to have than 8 ft/sec water velocity. You might be able to get away with 4" but again, it depends on the pump.

    The discharge side of the pump can also make a difference. Throttle the discharge and the pump is less likely to cavitate. However, you might not get 666 GPM then.

    This is really a system calculation. You cannot determine one piece without all the other pieces.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Reference or calculator for sizing of suction pipe

    I have more homework to do. The outlet would probably be 4 inch pipe, 100 feet of length with either no elevation difference, or perhaps up to negative 5 feet of elevation. Thanks for much, mas 985.

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