Chattering Pipe

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eggineer

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Let me give some background information.

I have been having some vibration in my pipes when I turn the water ON for a while and I checked the pressure in the house and it was 120psi. After trying to reduce it with my pressure reducer, it would not reduce. So I replaced it with a Watts LFX65BU 3/4" pressure reducer. This did fix the pipe vibration in the house and the water pressure is now at 50psi in the house.

However, there is now a pipe chattering before the reducer. The water line (3/4" copper) comes into the crawl space from the meter, turns and runs up the side of the block, and hits a "T" connector. The tap section is 1/2" copper pipe running horizontally to a water faucet about 6ft away from the tap and this is the pipe that is now chattering. I do not think it was chattering before the pressure reducer was replaced. The other side of the connector goes to my shut-off valve -> pressure reducer -> rest of the house. So this one faucet is at 120psi and the rest of the house is at 50psi. When I flush a toilet, turn on the shower, or the washing machine runs, that section of 1/2" pipe to that outside faucet physically vibrates until the water is turned off.

Does anybody have any suggestions or knowledge about this issue. I have research "water hammer" and I do not think this is a water hammer by difinition. I have let the air chambers (if there are air chambers) recharge by draining the whole house and refilling it. If I open that faucet outside, the chattering stops (obviously). I have thought about piping the faucet to the other side of the pressure reducer, but I want to be sure this is the fix before I try it. I have also thought about strapping it to the cinder block in a couple of places but if there is a hammer problem, I am still going to have a problem in time. Any advice would be appreciated.
 

Terry

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I would determine first which pipe is moving. The 1/2" or the 3/4"
If it's the 3/4", I would install a hammer arrestor before the PRV.
 
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