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Thread: Water hammer

  1. #27
    Join Date
    Nov 2006
    Location
    MA
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    61
    LK is this tank in a basement?

    I only ask because one time when I changed a water tank in a basement I closed an old stop and drain valve to isolate the water from draining back from upstairs. After the new tank was in I had the same issues.

    Cutting out the old stop and drains and replacing them stopped the water hammer issue. I guess they have some kind of rubber washer in them that comes loose when disturbed after years of not being exercised.

  2. #28
    Join Date
    Dec 2008
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    Ontario Canada
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    537
    Quote Originally Posted by tjcsf07 View Post
    LK is this tank in a basement?

    I only ask because one time when I changed a water tank in a basement I closed an old stop and drain valve to isolate the water from draining back from upstairs. After the new tank was in I had the same issues.

    Cutting out the old stop and drains and replacing them stopped the water hammer issue. I guess they have some kind of rubber washer in them that comes loose when disturbed after years of not being exercised.
    Interesting. I can't think of any valves I had operated to swap the tank that I were suspect. I just killed the main, drained the house and replaced the tank valves. But I had done that several times. Sometimes the noise does appear to be coming from the meter (installed right at the main shut off). Would have to get the city to shut the house down to replace the valve

    Going to try some of these suggestions this weekend. Hopefully with some results that will steer me in the right direction.

    Thanks to all for your help. Lots of good suggestions

  3. #29
    Join Date
    Feb 2012
    Location
    Pacific Northwest
    Posts
    96
    Check the system pressure. If you are getting more than 75 psi from the water meter, you need to install a PRV, just like you would do on your hydronic closed loop systems. Except this one will limit the water pressure to the house to >75 psi. rather than 12 psi for hydronic. Too much pressure causes water hammer, as do improperly secured pipe and supports. You can get a cheapo pressure gauge that hooks up to a hose bib from the big box store or Ferguson, etc. that will read to 100psi. I would start there.

  4. #30
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    Dec 2008
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    Ontario Canada
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    537
    Is it better to strap the pipes down nice and tight or just hold them in place?

  5. #31
    Join Date
    Feb 2012
    Location
    Pacific Northwest
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    96
    Quote Originally Posted by LKJoel View Post
    Is it better to strap the pipes down nice and tight or just hold them in place?
    Well that could be a double edged sword.

    Too tight, especially on hot water piping, and you could get expansion noise. But that can be eliminated if you use straps that allow for thermal expansion. I have always secured them tightly, and allowed for expansion. Talon, when used on pex generally allows for expansion. many other plastic hangers (we are talking residential here, where it commercial, there I use cushion clamps on strut channels) are also suitable. Those copper and steel two hole clamps, when over tightened, tend to bind when too tight, causing noise during thermal expansion.

  6. #32
    Join Date
    Dec 2007
    Posts
    4,670
    Quote Originally Posted by HotWaterHeat View Post
    to >75 psi.
    not harping because I do not use this often enough to remember, but does this mean less than or greater than 75psi?

    I thought you read the open part, mouth, as it appears. >=greater than and <=less than.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  7. #33
    Join Date
    Dec 2007
    Posts
    4,670
    You might be surprised to find a PRV on the main line already and it is the cause of the problem, as was stated.

    I had one that had similar diagnosis and I did find a failing/stuttering PRV on the main. had customer contact utility and not heard back.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  8. #34
    Join Date
    Apr 2010
    Location
    Ontario
    Posts
    474
    Just something to check.
    I replaced my hot water tank. Same for same. But I moved it 3 ft closer to the outside basement wall. I then had water hammer after that. I have a 100 ft garden hose outside. I discovered that if I leave the outside faucet for the hose on I get water hammer. Turn off the faucet, noise goes away. I don't know what the science is, but that fixed it.
    ENJOY THE RIDE

  9. #35
    Join Date
    Dec 2008
    Location
    Ontario Canada
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    537
    Quote Originally Posted by pacnw View Post
    You might be surprised to find a PRV on the main line already and it is the cause of the problem, as was stated.

    I had one that had similar diagnosis and I did find a failing/stuttering PRV on the main. had customer contact utility and not heard back.
    It wouldn't be built into the meter would it?

  10. #36
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    Dec 2008
    Location
    Ontario Canada
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    537
    Quote Originally Posted by Peztoy View Post
    Just something to check.
    I replaced my hot water tank. Same for same. But I moved it 3 ft closer to the outside basement wall. I then had water hammer after that. I have a 100 ft garden hose outside. I discovered that if I leave the outside faucet for the hose on I get water hammer. Turn off the faucet, noise goes away. I don't know what the science is, but that fixed it.
    So the full hose is acting like a cushion tank. Interesting

    Are long straight runs worse for hammer? The hot and cold mains are 3/4 copper and run the length of the house (the hot starts about half way down, cold goes all the way front to back almost 50')

  11. #37
    Join Date
    Jan 2007
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    Mn the state where absolutey nothing is allowed
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    1,333
    Quote Originally Posted by pacnw View Post
    not harping because I do not use this often enough to remember, but does this mean less than or greater than 75psi?

    I thought you read the open part, mouth, as it appears. >=greater than and <=less than.
    i > u. i greater than you

    http://despair.com/superioritee.html

    my boss thinks its possible to repeal the laws of physics

  12. #38
    Join Date
    Dec 2007
    Posts
    4,670
    Quote Originally Posted by LKJoel View Post
    It wouldn't be built into the meter would it?
    that I have ZERO knowledge of.

    The one I had was very similar to the type use in hydronic systems and was after the meter( both inside the home).
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  13. #39
    Join Date
    Dec 2008
    Location
    Ontario Canada
    Posts
    537
    Quote Originally Posted by pacnw View Post
    that I have ZERO knowledge of.

    The one I had was very similar to the type use in hydronic systems and was after the meter( both inside the home).
    I'll have to take a closer look

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