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Author:
Tucsonhammer (AZ)
1 just installed an expansion tank on my water heater hoping it would eliminate a water hammering noise in the wall. It seemed to have helped a bit but not eliminated the problem. I have what sounds like a loose water pipe in the wall, When any valve is turned off you hear a pipe banging in the wall. The banging seems louder on the hot water side. It never bangs when toilets are flushed, but there is a faint bang when cold water faucets are turned off. You also hear the hammering in the wall when the irrigation system turns on automatically. The pressure to the residence is about 50 psi so I don't have a pressure regulator installed. I put hammer arrestors on the laundry room, each individual run and one on the 1" water main running to the residence and they had no effect on the banging. I've injected about 10 large cans of expanding foam into the 2" x 6" wood framed walls where I hear the noise. That seemed to have helped a little bit. The copper piping runs through the concrete foundation and the noise is in the area of about 3' where the main runs in and about 5' above the floor. We also had 2 hot water lines installed to accommodate a water recirculating pump.
The pressure on the expansion tank is about 50 psi which is about equal to the water pressure running into the house. Would reducing or increasing the pressure on your tank have any effect on reducing the banging? Does anyone have any suggestions? I've had two plumbers out and they weren't able to solve the issue. When the problem was discussed with a 3rd plumber, he didn't want anything to do with it. Any suggestions your able to provide is greatly appreciated. We constructed the house about 12 years ago and the hammering has been with us for about the past year. We don't recall anything which may have created this issue.
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Author:
steve (CA)
You should open the wall in the offending area and secure the pipe.
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Author:
Tucsonhammer (AZ)
I've opened the wall and the pipes seemed secure. When I patched the wall I put in 2 sections of 1" x 4"'s which applied a bit more pressure on the pipes. Then after the drywall was put in place I ejected expanding foam around the pipes for greater stability. When you touch the pipe it almost seems you can feel the water inside the pipe is causing the noise.
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