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ffgus 12-31-2006 08:46 AM

Water Hammer
We own a 2 story colonial with copper plumbing. When the water faucets are turned off a terrible water hammer occurs. There are water hammer arresters on the hot and cold under the kitchen sink and under the first floor laundry tub. I have drained the entire house water system by shutting off the main valve to the house, and opening up the highest faucet and the lowest faucet. After I "refill" the house plumbing the hammer goes away. But then after a few weeks, the hammer slowly returns. What do I have to do next? It sounds like the whole house is coming undone when the pipes shake.

Ron The Plumber 12-31-2006 10:04 AM

Test the pressure on the house, if the pressure is 80 psi or higher you will need a pressure reducing valve installed on your house.

ffgus 12-31-2006 10:16 AM

We are on standard city water main, municipal water works, Milwaukee WI

Ron The Plumber 12-31-2006 10:19 AM

Test the pressure, I've seen city water be as high as 110 psi, this could be a cause of water hammer.

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