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    meg44's Avatar
    meg44 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 10, 2013, 03:29 PM
    Why does water pressure drop when a second tap is turned on?
    We have a new mobile home. When water is running in one location and a second faucet is turned on, the water flow at the first spot decreases considerably. There does not seem to be a backflow preventer installed. Would it help to install one, or is there another solution? A corroded galvanized connector at the water meter box was just replaced, and overall house pressure seems to be good.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Dec 10, 2013, 03:59 PM
    Pressure depends upon volume. If you don't have the volume in a making more than one draw will decrease the pressure considerably. This is caused by undersized water pipes.
    A back flow preventer will not give you more pressure. I have no solution for this problem. Other than to repipe using a three-quarter main with half inch branches.
    I know this isn't what you wanted to hear that this answers your question. Good luck, Tom
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #3

    Dec 10, 2013, 04:34 PM
    If you have pressure but lose volume, you may have a rust restriction, kink or other obstruction the supply pipe. The obstruction is acting as a critical orifice and only allowing so much water through. It could be a partially blocked PRV. It could also, as Tom stated, be due to insufficient pipe size.
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