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    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #1

    May 1, 2008, 05:03 AM
    Volume Question
    I need to know how to figure how many gallons of water do I have to pour into a 10" diameter pipe to get 5 pounds of head pressure if a 1 foot raise equals .434 PSI of head pressure. Thanks, Tom
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 1, 2008, 02:00 PM
    If 1 ft of head gives 0.434 psi of pressure, then the height of the column of water you need is 5/.434 = 11.52 ft. So now simply calculate the volume of water in a 10" diameter pipe that is 11.52 feet long. The volume of a cylinder is pi*r^2*L, where r = the radius = 5 inches . Make sure that your units are all in inches (not feet). This gives the answer in cubic inches. You then divide this by a conversion factor of 231 cubic inches/gallon to get the answer into gallons. Post back if you need more help on this.

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