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-   -   how to fix water hammering noise (http://www.diychatroom.com/f7/how-fix-water-hammering-noise-128974/)

newhomenj 01-05-2012 09:47 PM

how to fix water hammering noise
 
hi, when ever I turn the hot water in my 2nd floor i hear a water hammering noise between the 1st and second floor. when i take a shower and come out i can still hear the water hammering noise for about 15-30 minutes. I can hear the banging noise once every 8-12 seconds .... i just got the water pressure in my house is 120psi so i am installing a water pressure relief valve because the pressure is so high in our house... but any suggestion to stop the \water hammering noise? Do i have to cut the celing sheetrock to get inside and fix it...

any suggestions?

thanks

joecaption 01-05-2012 09:51 PM

A water hammer would just make one bang. Sounds like something else going one.
Public water, or well?
That pressures is way to high, good chance it could burst the pipes or cause some leaks, work on that first.

ben's plumbing 01-05-2012 09:58 PM

Quote:

Originally Posted by newhomenj (Post 813976)
hi, when ever I turn the hot water in my 2nd floor i hear a water hammering noise between the 1st and second floor. when i take a shower and come out i can still hear the water hammering noise for about 15-30 minutes. I can hear the banging noise once every 8-12 seconds .... i just got the water pressure in my house is 120psi so i am installing a water pressure relief valve because the pressure is so high in our house... but any suggestion to stop the \water hammering noise? Do i have to cut the celing sheetrock to get inside and fix it...

any suggestions?

thanks

the pressure is too high after you install the pressure relief valve ..check and see if some of the problems go away....seem like commodes fill valves may have been effected by the high pressure and after showering they start to run again...

TheEplumber 01-05-2012 09:58 PM

Set your PRV to about 60lbs. and consider installing a thermal expansion tank on the cold line as well.

#1plumber 01-05-2012 10:02 PM

Install a pressure reducing valve after the water meter. Water pressure should never be over 75 psi in a house. The PRV should get it under that. I would also install a No. 9 soft seated check or swing check after PRV. That should take care of it.

Alan 01-05-2012 11:54 PM

You don't need a pressure relief valve. You need a pressure reducing valve. Once you do that, if you're still having problems, the pipes may just be dangling too loosely inside of the wall.

newhomenj 01-06-2012 07:40 AM

ok thanks.. let see Installing the pressure reducing valve today on the main water supply line.. hope that works..

newhomenj 01-07-2012 05:53 PM

i had 120 psi water pressure and now we have installled a pressure reducing valve so now i have 60 psi.... but i am still getting the water hammering noise between the 1st and 2nd floor .. the noise is every 20 seconds... i guess i will need to open the wall? any other suggestion before i break the wall?

thanks

Alan 01-07-2012 08:06 PM

Every 20 seconds whether you're using water or not? :huh:

Sounds like the could be expanding. It might be rubbing against something or perhaps installed through a tight hole. Copper water lines or pex or ?????

newhomenj 01-08-2012 10:49 AM

its copper pipes, it starts when I am taking a hot shower and when i turn off the shower it takes about 20 to 30 minutes before the banging sound goess off... seems like the pipes are expanding due to the hot water ...


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