(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 5 of 5

Thread: Water Hammer Problem????

  1. #1
    DIY Junior Member rmpangan's Avatar
    Join Date
    Jul 2013
    Location
    Nevada
    Posts
    2

    Default Water Hammer Problem????

    Hi guys,

    I started having this problem about 8 months ago. The problem is intermittent so it is hard to replicate the issue. Anyway, before I describe my problem, let me just give some background info on my house plumbing updates. We did some renovation 5 years ago where all the 3 bathrooms where updated. The shower controls/valve and toilets were all replaced. About 2 years ago, I had a problem when a rodent was able to get inside my wall and chewed the water line that goes to the refrigerator. Did some damaged to my first floor ceiling but I got the SOB. Anyway, the water line was fixed and everything is back to normal.

    Here is my problem: sometime last year, I noticed that the water coming out of my faucet ( kitchen and bathroom upstairs/downstairs) is pulsating. I just thought it was unusual but maybe it was just water pressure in the neighborhood causing it. It lasted maybe a few hours and then it was gone. I guess a few months after that, I heard a banging sound ( like pipes hammering ) coming from inside the wall near the second floor guest bathroom. It sounded like it was getting louder and louder. I opened the faucet on the bathroom and noticed that the water again is pulsating. I cant remember if I flushed the toilet or what else I did but it did stop after a few minutes. Several more occurences happened since, where I can see the water pulsating first from the faucet or shower head and then the banging sound will start getting louder. I kind of figured out that when I flush the toilet on the second floor guest bathroom, it seems to fix the problem. BTW, i tried to flush the master bathroom toilet (when the hammering sound is happening) which is also on the second floor but this did not fix the problem.

    All i know at this time is the hammering sound is coming from the second floor guest bathroom. It seems that flushing the toilet fixes the problem. It doesnt happen all the time but maybe because nobody uses the guest bathroom often. I think the problem happens when I have a guest using this bathroom since the last 2 incidents happened when I had a visitor.

    Is this a water hammer problem? Anything I could do to prevent it from happening? Thanks.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,388

    Default

    Do you have a PRV to reduce the water pressure in the house? It may be failing or failed. Do you have an expansion tank (needed if you have a PRV)? It could be waterlogged and needs to be replaced. Check the drain on the water heater and verify that the T&P valve is not weeping water. Best to check this after a big use of hot water while the tank is reheating the water and you are no longer using hot. The expansion of the water as it is heated can raise the pressure if it is a closed system if there's no provision to expand (that's what an expansion tank is for).

    Get a water pressure test gauge. They're cheap (around $10). Get one with a second tattle tale hand that will indicate peak pressure. Leave it attached for 24-hours. See what the peak pressure and static, average pressure is. It should not exceed 80psi. High water pressure can cause some weird noises in plumbing and stresses the supply hoses on faucets and washing machines. Toilet fill valves are often one of the weaker shutoffs in the house, and they can make some weird noises if the pressure gets high.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    In the Trades Jerome2877's Avatar
    Join Date
    Aug 2009
    Location
    BC
    Posts
    384

    Default

    Try turning the shut off to the toilet that fixes the problem off. I am guessing its the ballcock in that toilet. If not then check other things like the peressure in the house.

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,624

    Default

    Your problem could be occurring in many places, so we cannot tell you exactly where without doing our own testing, but often the thing that "cures" the problem is also what is causing it. Check or replace the toilet valve and see if the problem disappears.
    Licensed residential and commercial plumber

  5. #5
    DIY Junior Member rmpangan's Avatar
    Join Date
    Jul 2013
    Location
    Nevada
    Posts
    2

    Default

    Quote Originally Posted by jadnashua View Post
    Do you have a PRV to reduce the water pressure in the house? It may be failing or failed. Do you have an expansion tank (needed if you have a PRV)? It could be waterlogged and needs to be replaced. Check the drain on the water heater and verify that the T&P valve is not weeping water. Best to check this after a big use of hot water while the tank is reheating the water and you are no longer using hot. The expansion of the water as it is heated can raise the pressure if it is a closed system if there's no provision to expand (that's what an expansion tank is for).

    Get a water pressure test gauge. They're cheap (around $10). Get one with a second tattle tale hand that will indicate peak pressure. Leave it attached for 24-hours. See what the peak pressure and static, average pressure is. It should not exceed 80psi. High water pressure can cause some weird noises in plumbing and stresses the supply hoses on faucets and washing machines. Toilet fill valves are often one of the weaker shutoffs in the house, and they can make some weird noises if the pressure gets high.
    I have looked for the PRV in my garage but I have not found any. I do know that I do not have an expansion tank. Is there any other location that I might look for a PRV? I have a water softener in the garage next to my water heater and I did not see any PRV close by. I will get a water pressure gauge to check my avg and peak pressure. will also try to check the suggestions on the toilet ballcock.

    Thanks for all the suggestions. Only problem I have is I do not know how to duplicate the issue so I cant tell if the problem will be fixed or not. I will get back to you guys when I get any result.

Similar Threads

  1. Another water hammer problem
    By tedr in forum Pumps and Tanks Well Forum & Blog
    Replies: 6
    Last Post: 08-30-2012, 09:38 AM
  2. weird water hammer problem
    By Rinatin in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 7
    Last Post: 06-28-2011, 06:02 AM
  3. problem with water hammer......
    By nadine in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 01-05-2008, 01:20 AM
  4. Water Hammer Problem
    By slagger in forum Pumps and Tanks Well Forum & Blog
    Replies: 10
    Last Post: 10-08-2007, 02:25 PM
  5. water hammer problem..help!
    By Bennet Young in forum Pumps and Tanks Well Forum & Blog
    Replies: 1
    Last Post: 12-23-2005, 02:47 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •