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  1. #1
    Join Date
    Jun 2011
    Posts
    10

    Default water hammer issues

    Our 15 year old house suddenly developed water hammer issues( at least I think that is what it is ). we had some work done on our pipe line.The problem developed after that.
    Whenever the washer works I hear a banging sound in the kitchen, especially from the back of refrigerator.
    ( washing machine is next to kitchen)
    We have a pressure reducing valve and a new thermal expansion unit. ( the plumber said the water pressure is around 65 ).
    I called the plumber and he said it is nothing to worry about. But I am kind of worried & quite annoyed by the loud sound .
    Is it water hammer or something else?
    Can we do something about it ?
    Or is it wise to ignore the problem ?
    will reducing the water pressure to home will eliminate the issue ?

    Thanks in advance

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: water hammer issues

    65 pounds is very on the high side. Most plumbing fixtures are designed to have a maximum working limit of 70 psi. Most municipal water systems are running much closer to 50 -55 psi.

    Get some add on shock arrestors for the washer from a big box store. Sioux Chief 660-H Laundry One Fixture Water Hammer Arrester for $10 You'll need a pair, one for hot one for cold. They install fairly easily.

    Check on that pressure to make sure. If you are on a well, I'd dial it back a bit.
    Last edited by HoustonRemodeler; 07-01-2011 at 12:47 PM.

  3. #3
    Join Date
    Jun 2011
    Posts
    10

    Default Re: water hammer issues

    No well .We are on city water supply ( DFW area).
    Is there anyway we can reduce water pressure to home ? ( already have PRV& thermal expansion tank )
    Should we put water hammer Arrester in kitchen side as well like near dish washer /ice maker etc ?

  4. #4
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: water hammer issues

    Quote Originally Posted by mom1967 View Post
    No well .We are on city water supply ( DFW area).
    Is there anyway we can reduce water pressure to home ? ( already have PRV& thermal expansion tank )
    Should we put water hammer Arrester in kitchen side as well like near dish washer /ice maker etc ?
    You can put arrestors all over the house. The more the merrier. I called the Dallas water dept to find out the average pressure and they are doing a phone system upgrade today. (a likely excuse to leave early for the weekend)

  5. #5
    Join Date
    Jun 2011
    Posts
    10

    Default Re: water hammer issues

    Thanks for the advice.
    We are under City of Plano water supply. I called them as well. They put me on hold for more than hour , then phone line cut off !!

  6. #6
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,741

    Default Re: water hammer issues

    Information about reducing water pressure:

    If, after the long holiday weekend, you find out that you need to reduce your water pressure in the house, you can do it at your water pressure reducer valve. You will need a water pressure gauge.

    1. Locate the 1/2" bolt and the 1/2" retaining nut at one end of the valve.
    2. carefully loosen the retaining nut.
    3. To reduce the pressure you will need to unscrew the bolt out. Do 2 turns at a time.
    4. Tighten the retaining nut. Check your pressure. If still higher than the recommended pressure, repeat.

  7. #7
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: water hammer issues

    Quote Originally Posted by mom1967 View Post
    No well .We are on city water supply ( DFW area).
    Is there anyway we can reduce water pressure to home ? ( already have PRV& thermal expansion tank )
    Should we put water hammer Arrester in kitchen side as well like near dish washer /ice maker etc ?
    Yes , the pressure can be reduced at the PRV --- that's the function of the PRV -- to regulate whatever pressure you set for the house.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  8. #8
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,741

    Default Re: water hammer issues

    To install a water hammer arrester, you'll need experience in plumbing. If you don't feel comfortable dealing with pipes, connections, etc. you'd better call a plumber.

    Water hammer arresters come with different types of connections: male pipe connector, compression connector, male sweat connector, and a few others. So, you need to know what kind to get, to fit your situation. Then you need to have the capacity to safely install it.

    good luck.

  9. #9
    Join Date
    Sep 2011
    Location
    Michigan
    Posts
    7

    Default Re: water hammer issues

    When a older house was plumbed, air chambers were typically installed behind the walls. These are teed off of the feed lines to your fixtures and are meant to have air in them to cushion abrupt water shut off. The water "bounces" in the air chamber thus no sudden stop of water flow. Over time, the air in these chambers is absorbed into the water. If your house has these installed, shut off your main water supply valve and open your faucets, both hot and cold, allowing them to drain. What will happen is air will work its way back into these chamber. Close the faucets and open the supply valve. If you have these chambers, your problem should stop.

  10. #10
    Join Date
    Sep 2011
    Location
    Downtown, Baton Rouge, Louisiana
    Posts
    13

    Default Re: water hammer issues

    Sounds like the solenoid valve on the washing machine is causing the hammer...

    65 pounds is normal water pressure in the DFW area, has been since I lived there in the 1980's - 90's...

    If you have a PRV and an expansion tank, I don't know if installing arrestors will help - might need to go into the attic (if water lines are present) or into the wall between the kitchen and laundry and physically strap/secure the water lines.

    Water hammer, if left to IT's own devices, will eventually cause a leak somewhere - no ifs, ands or buts...

    Unsecured water lines are frequently the culprit here, due to poor training, installation methods and inspections.

    I hope this helps...

    Friendly Home Services Baton Rouge...

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