At my wits end here, hoping for advice. Been fighting noisy pipes in my house since I moved in 10 years ago. Not a hammer or echo, but a vibration or humming sound. It is an old house but I believe all copper pipes replaced just before I bought (house was gutted and rehabbed).
First I replaced the PRV, but still had noise, so I turned down pressure to 35 psi. That seemed to help, but obviously wife did not like low pressure showers. After a few years, vibration noise seemed to get worse, especially after running hot water, and I thought it may be pressure related still. After putting a gauge on the outside spigot, I confirmed that after running hot water, the pressure would creep up from 35psi to over 70. House did not have a thermal expansion tank so I just recently turned pressure back up to 50psi and installed the tank. Now the pressure on gauge is constant but the hum is worse, especially if you turn any sink on full blast. It will hum (loudly) with running water and stop shortly after you turn off sink. It will not hum if you run a bath/shower or flush the toilet. I have done everything online says to check, like closing all valves one by one. I have gone around the basement putting my hands on pipes at different spots trying to feel if there is a loose bracket or perhaps pipe vibrating against a board, but cannot seem to find a culprit. I'm afraid with the higher pressure there is real risk for bad damage here. Any ideas would be appreciated.
First I replaced the PRV, but still had noise, so I turned down pressure to 35 psi. That seemed to help, but obviously wife did not like low pressure showers. After a few years, vibration noise seemed to get worse, especially after running hot water, and I thought it may be pressure related still. After putting a gauge on the outside spigot, I confirmed that after running hot water, the pressure would creep up from 35psi to over 70. House did not have a thermal expansion tank so I just recently turned pressure back up to 50psi and installed the tank. Now the pressure on gauge is constant but the hum is worse, especially if you turn any sink on full blast. It will hum (loudly) with running water and stop shortly after you turn off sink. It will not hum if you run a bath/shower or flush the toilet. I have done everything online says to check, like closing all valves one by one. I have gone around the basement putting my hands on pipes at different spots trying to feel if there is a loose bracket or perhaps pipe vibrating against a board, but cannot seem to find a culprit. I'm afraid with the higher pressure there is real risk for bad damage here. Any ideas would be appreciated.