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  1. #1
    Join Date
    Dec 2012
    Posts
    4

    Default Noisy pipe in wall

    In my steam heating system, when system is beginning cycling or after cycling, I will periodically get a loud, sharp bam! bam! Rapid fire sound from inside one particular wall, that does not sound like water hammer (sounds like handgun shots; very loud and sharp).

    Could this sound be water hammer? If not water hammer, what might cause this? How can I realistically diagnose? Fix?

    THX!!!

  2. #2
    Join Date
    Aug 2007
    Posts
    7,238

    Default Re: Noisy pipe in wall

    It is likely expansion of the pipe rubbing on framing or drywall. As for a fix, not much you can do, really. If you wanted to open up the wall, you can install plastic grommets around the pipe where it penetrates framing, but that's a big, messy job that won't likely cure much.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: Noisy pipe in wall

    As Spruce pointed out, the noise comes from the pipes expanding and contracting. Pinpoint the spot as best you can and start removing drywall. let us know what you find.

  4. #4
    Join Date
    Dec 2012
    Posts
    4

    Default Re: Noisy pipe in wall

    Yeah, that's what I figured..,I just replaced the main vents to get steam moving unhindered, this may be the price I pay!

  5. #5
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,227

    Default Re: Noisy pipe in wall

    You have a one pipe steam system. With this type system all lines must pitch back to the boiler. If they don't and condensate becomes trap in the line when the steam hits it it will sound like someone is hitting the pipe with a hammer. Also check the radiators I have seen them pitching away from the side the pipe is connected to, do to settlement of the home. This will trap water in the radiator causing your problem. If this is the case just shim the radiator up on the opposite side of the steam pipe.

    John

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