Greenwood
New Member
I think I should discuss about these possible reasons with the plumber next time he comes. Thank you!With copper piping, the Copper Institute's recommendation on maximum velocity of the water is 5fps for hot, and 8fps on cold. On a 1/2" pipe, that's only 4gpm on the hot supply. If those numbers are exceeded, you start to get water flow noises and potentially, erosion inside of the pipes. The friction from the higher velocity also causes more friction and the dynamic pressure drops.
Water flow noises could be from various sources:
1. excessive velocity causing turbulence (may require larger pipes to resolve)
2. a partially opened valve with a washer - when worn, the washer can vibrate during some flow rates
2a. a gate valve that is worn that is rattling the gate. Normally not an issue when fully opened or fully closed.
3. on a tub spout, the seal when diverting can vibrate on its seat
4. a mineral clogged shower head
5. probably lots of others
Being there and hearing it might offer a bit more insight. Hard to say from remote.
This is a big headache as it involves the downstairs neighbors, the HOA and the plumbing company. I can't always let my downstairs neighbor take leave from work time and time again.