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bob from maine
User Rank
Platinum
Re: Water Hammer stopped but not cured.
bob from maine   12/7/2012 10:15:31 AM
NO RATINGS
In all the houses and remodels I have done, I've always required my plumber to install water hammer arrestors like the ones described by Sliderulefarmer in the hot/cold lines adjacent to every electrically operated valve; washing machine, dish washer. Water hammer probably destroys more water mains and causes more damage inside houses than most other single events. I've seen 30 ton fire trucks actually moved sideways when a valve was incorrectly slammed shut on a 5" line. Good observation, connecting the toilet valve and knocking noise.

SlideRuleFarmer
User Rank
Iron
Water Hammer stopped but not cured.
SlideRuleFarmer   12/7/2012 10:02:42 AM
NO RATINGS
While you did stop the hammering by finding the source of initially oscilating valve, the true problem lies in poorly installed lines. Having worked under a great plumbers watchful eye, he always made sure we secured the lines throughout the walls. Water hammering is started by a valve opening and closing quickly, toilet, washer, dish washer, even shower valves can do this at times, but the real noise comes from the pipes banging on the studs and walls somewhere in the house. To really stop this from ever happening again you need to install a water hammer arrester. Sounds complex but it is simply a short piece of capped pipe (<1 foot) installed vertically somewhere in the system, being vertical it holds a small air pocket at the top that dampens & eliminates water hammering. You need to install one on both the hot and cold lines. With the new PEX piping this has become less of a problem as PEX seems to have a little give in it that dampens the hammering.

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