1. #1
    BFD 210
    Firehouse.com Guest

    Post Water in 4 inch hose and 5 inch hose

    If anyone can help me determine the amount of water per foot in 4 inch hose it would be greatly appreciated. I believe that a 5 inch holds approximatly 1 gallon per foot. I have found this in reference but i cannot find 4 inch. Thanks for any help.
    Stay safe

  2. #2
    Dalmation90
    Firehouse.com Guest

    Cool

    Sure BFD --

    Fire hose is a cylinder.

    The volume of cylinder is determined by the formula: pi(r^2)h
    r is the radius. For 5", thats 2.5"; for 4" it's 2" The little ^2 is computer shorthand for squaring - multiplying the radius by itself.
    h is height, or in the case of hose the length.

    So, for 12" (1 foot) of hose is:
    5" -- 3.14x(2.5x2.5)x12 = 235 cu. in
    235 cu. in /1728 = 0.13 cu. ft.
    4" -- 3.14x(2x2)x12 = 151 cu. in.
    151 cu. in /1728 = .09 cu. ft.

    Ok...I know, you want gallons! 1 gallon of water = 0.13 cu. ft.

    So 1' of 5" hose holds .13/.13 = 1 gallon
    and 1' of 4" hose holds .09/.13 = .7 gallons

    Matt

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