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Thread: Plumbing/fixtures hammer after irrigation pipe install

  1. #1
    DIY Member JeffH's Avatar
    Join Date
    May 2006

    Default Plumbing/fixtures hammer after irrigation pipe install

    Problem did not exist beforehand. Landscaper (not me) simply tied into the riser of the backyard bib riser. The sprinkler system is on a timer. Now when the irrigation water shuts off, indoor plumbing hammers. Did not have backyard sprinklers before and the front sprinkler system has always worked fine. What should have been done or what can be done now to make this work without problems. Are arresters a probable fix? if so, where to install? On the outside bib?

    Thanks folks!
    Last edited by JeffH; 10-23-2007 at 04:33 PM.

  2. #2
    Commercial Plumber markts30's Avatar
    Join Date
    Sep 2006
    Phoenix, AZ


    A fast closing valve on the irrigation causes the water rushing through the pipe to stop suddenly - the vibration in the pipe is what you refer to as water hammer...
    To solve it, get a hammer arrester and place it close to where the irrigation valve is (but before it)...
    Hammer arresters work like the shock absorber in your car - soften impacts preventing damage...


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