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    dfcassidy's Avatar
    dfcassidy Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 5, 2009, 02:08 PM
    Replacing a pressure tank
    How do I determine the size needed?
    mazak's Avatar
    mazak Posts: 148, Reputation: 5
    Junior Member
    		  
    #2

    Jul 5, 2009, 02:31 PM

    Is there any information on the old tank? I assume were talking about a water well.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Jul 5, 2009, 02:34 PM
    Why not simply replace with the same size tank?
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #4

    Jul 5, 2009, 04:13 PM

    Don't know if there is a specific rule for private residential and if there is, it probably varies from location to location.

    In setting up mobile home park many years ago, I was required to provide 5 gallons per minute for a 20 minute period.

    That means if your well and pump provide 3 gallons per minute or 60 gallons, you tank must have a 40 gallon capacity. That seems like a lot, but if you are taking a long shower, someone flushes the toilet a couple of times and the clothes washer is running you are still not going to run out of water.

    A galvanized pressure tank has a capacity of 1/3 its size. A bladder tank is about 1/2 its size.

    I believe in big tanks. The bigger the tank the longer the pump last.

    That mobile home park well pump is pushing 30 years.
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