The water pipe in my house always bang to make noise. I used water pressure gauge to measure the water pressure. I found that pipe will bang when pressure goes up over 75. So I adjust pressure reducing valve to reduce water pressure to 40 (normal situation). The banging pipe seems gone. But the water flow for second and third floors are small compared with before reducing water pressure. Also I found that if I don't use water (hot or cold) for a while, the pressure will go up from 40 to over 75. At this moment, pipe start to bang again. If I go to any faucet to open water, the water pressure will promptly drop to below 40. Then banging pipe will be gone.
My question is: is this banging pipe caused by thermal expansion from water heater? If not using hot water for a while, thermal expansion will push water pressure in pipe up to the point that water hammer occurs? Or is there any other reasons to make this banging pipe? What is the best solution to resolve this problem? Thanks for your help and input.
My question is: is this banging pipe caused by thermal expansion from water heater? If not using hot water for a while, thermal expansion will push water pressure in pipe up to the point that water hammer occurs? Or is there any other reasons to make this banging pipe? What is the best solution to resolve this problem? Thanks for your help and input.
