Hammer Arrestors

Discussion in 'Remodel Forum & Blog' started by NaplesX5, Aug 4, 2006.

  1. NaplesX5

    NaplesX5 New Member

    Aug 4, 2006
    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?

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    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 a moderator: Feb 22, 2009
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  4. NaplesX5

    NaplesX5 New Member

    Aug 4, 2006
    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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