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Thread: Hammer Arrestors

  1. #1

    Default Hammer Arrestors

    We are in the middle of a bathroom renovation and the contractor is using the Vanguard red & blue PEX tubing.

    The old copper sink plumbing had a hammer arrestor, larger pipe that went straight up and was capped, at the shut off valves. The new layout with the PEX tubing does not have these.....does the PEX tubing negate the need for a hammer arrestor?


    Thanks

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    Not necessarily, but a hammer arrestor is only needed where you have fast acting valves - like the icemaker, washing machine, etc. A hammer occurs when the moving water is quickly turned off and the inertia tries to keep moving. Having an air chamber buffer helps absorb that energy.

    Now, as to what you had...it was probably useless after a couple of months. The moving water eventually will absorb all of the air, and then that pipe was nearly useless until the next time your drained the pipes. A proper hammer arrestor has a sealed air chamber. Different brands do it different ways. The chamber can compress, but it doesn't touch the water, so the air does not get dissolved in the water...it lasts much longer.
    Last edited by Terry; 02-22-2009 at 09:32 AM.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

    Default

    Thanks for the info...as i looked at the "design" i scratched my head as to how it would not fill up with water...???

    Thanks Again!

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