Re: water pipe hammering
Posted by hj on September 14, 19100 at 09:47:10:
In response to Re: water pipe hammering
Water hammer is the equivalent of driving down a road at high speed and smashing into a brick wall. If water is flowing through a valve at high volume and the valve is turned off rapidly, as many new quarter turn valves are prone to do, that is the brick wall and the water bangs, but then it rebounds or bounces back down the pipe and returns like a wave and bangs again. This process is repeated several times. Sometimes you can hear the separate bangs and other times they appear to be just one. anchoring the pipes will merely cover up vibration, the hammer has to be prevented at the source by shock arrestors or other mechanical means, even remembering to turn off the water slower will help, unless it is the electric valve in the dishwasher that is causing it.
: : I would like to know what causes water pipe hammering and how I would go about correcting it?

: Water flows under pressure quickly through the pipes when you open a faucet, and stops suddenly when you close it. As it rushes around bends it has its own inertia. Each action has its own reaction. Plumbers are required to fasten the piping securely to hangers or framing members when new construction occurs. The constant vibration transmitted to those fasteners sometimes causes them to wiggle loose inside the wall cavity, and then the pipe vibrates against the framing members or against other utilities inside the wall. To correst it, pinpoint the vibration noise location. Cut open the drywall, resecure the pipe to the framing member and or cushion the nearness to other utilities, and replace the drywall and paint.

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