Pipes humming/whining

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Malibu Jim, Jun 10, 2011.

  1. Malibu Jim

    Malibu Jim New Member

    Messages:
    18
    Location:
    California
    We have been in this house since it was built in '71. No problems until it was re-piped 2 yrs ago. Since then, we have a humming or whining every time one of the 3 outsides spigots is used. I thought this was air in the system and would work its way out, but it hasn't. As the water enters the house, there is a T, to allow inside water to pass thru a water softener, whereas outside water is piped directly to the 3 spigots. There is no problem with the inside water, but the outside whines from any spigot, and changes tone when increasing or decreasing the flow. We have no pressure regulator and pressure is aprox 68#.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,298
    Location:
    Bothell, Washington
    What brand of outside faucet?
    Some are louder then others.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,043
    Location:
    Cave Creek, Arizona
    Usually the sound is caused by the "back flow preventer" either integral with the valve or fastened to the outlet threads.

    [​IMG]
    Last edited by a moderator: Jun 18, 2011
  4. Malibu Jim

    Malibu Jim New Member

    Messages:
    18
    Location:
    California
    I couldn't find any name on the spigots, but took a photo of them to post, as there is a symbol cast in the spigot body. Saw hj's comment, so went out and removed the "back flow preventers," which were installed on all outside spigots during the repipe. That was it! Noise is gone, thanks a million.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,043
    Location:
    Cave Creek, Arizona
    quote; hj's comment, so went out and removed the "back flow preventers," which were installed on all outside spigots during the repipe.

    Someone did NOT install them properly, because if they had you would NOT have been able to "remove them". Just got back from a job where the customer tried to remove his. When he asked me how to do it, I told him you were not supposed to be able to do it, and since the valve is usually worn out by the time the vacuum breaker goes bad, it is just as easy to replace the entire unit.
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