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    Brentrh's Avatar
    Brentrh Posts: 1, Reputation: 1
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    #1

    Jul 25, 2007, 02:12 PM
    Lawn and guarden irrigation
    How many gallons per minute can I pump at 20 psi?
    tickle's Avatar
    tickle Posts: 23,796, Reputation: 2674
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    #2

    Jul 25, 2007, 05:04 PM
    Useful formula for determining gallons per minute


    Useful formula for determining gallons per minute:

    GPM = GPA x MPH x W

    (per nozzle) 5.940



    GPM = Gallons Per Minute

    GPA = Gallons Per Acre

    MPH = Miles Per Hour

    The width is measured between the spray nozzles in inches. Or, you can measure the length of the entire boom and divide it by the number of nozzles.

    W = Nozzle spacing (in inches) for broadcast spraying

    = Spray width (in inches) for single nozzle, band spraying or boomless spraying

    = Row spacing (in inches) divided by the number of nozzles per row for directed spraying
    ThomasCKeat's Avatar
    ThomasCKeat Posts: 157, Reputation: 12
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    #3

    Jul 25, 2007, 05:24 PM
    20 pounds per square inch of pressure, now what is the capacity of your line.(pipe size matters) a half inch line won't give the same volume as a 1 inch line. Bigger the line the more volume it is capable of. Size does matter
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