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  • Dishwasher install leads to water hammer

    Running a new dishwasher for the first time produced water hammer to wake the dead when the fill valve closed (true water hammer, not just unstrapped pipes banging against joists or whatever). The kitchen sink faucet (cartridge style) now leaks badly, and the hot-water compression faucet in a nearby bathroom sink has a steady drip that wasn’t there before.

    Before operating the dishwasher a second time, I drained the house’s water system. This purged most of the air, though some of it apparently migrated because now I get a small slam when the fill valve for the first-floor toilet closes. This valve never gave me any trouble before. The dishwasher valve closes without any hammer at all.

    Assuming water-hammer arresters are the answer, how should a plumber proceed in this case?

    In installing dishwashers and washing machines that have quick-closure solenoid valves, is there any way to anticipate and prevent water hammer short of installing an arrester before turning the water back on? (Surely nobody does that routinely, do they?)

  • #2
    Re: Dishwasher install leads to water hammer

    I don't
    A properly plumbed house does not hammer
    At least mine don't

    Comment


    • #3
      Re: Dishwasher install leads to water hammer

      I vote shutoff valve is the problem.
      Check that it's fully on.
      Mpls water pressure is not that high so the solenoid valve
      should be no more a problem than a dishwasher
      or washing machine.
      I have a fancy washin' type machine..no hammer here.
      Last edited by Jay Mpls; 03-31-2010, 09:32 PM. Reason: oh yea.

      Comment


      • #4
        Re: Dishwasher install leads to water hammer

        Some jurisdictions require hammer arrestors on all quick closing valves.
        Clothes Washing Machine
        Ice Maker
        Dishwasher
        Flushometers
        Etc.

        Comment


        • #5
          Re: Dishwasher install leads to water hammer

          Not required here but often a 'sound' idea.

          Comment


          • #6
            Re: Dishwasher install leads to water hammer

            Originally posted by Jay Mpls View Post
            Not required here but often a 'sound' idea.
            I don't know
            The seem like overkill on most stuff
            The flushometers I can see needing them.

            Comment


            • #7
              Re: Dishwasher install leads to water hammer

              Hmmm, could that be why the owner of the plumbing company that installed the dishwasher told me that he had never in his life heard of water hammer?

              The plumbing in my 70-year-old one-story house, all copper except for two risers, is pretty much visible. Two housing inspectors in the last two years have given it four big thumbs up.

              Comment


              • #8
                Re: Dishwasher install leads to water hammer

                Water hammer = plumbing 102
                Last edited by Jay Mpls; 03-31-2010, 09:50 PM. Reason: Ugly Americans looks funny tonight

                Comment


                • #9
                  Re: Dishwasher install leads to water hammer

                  Originally posted by Jay Mpls View Post
                  I vote shutoff valve is the problem.
                  Check that it's fully on.
                  Mpls water pressure is not that high so the solenoid valve
                  should be no more a problem than a dishwasher
                  or washing machine.
                  I have a fancy washin' type machine..no hammer here.
                  The dishwasher is a Maytag installed by a Sears subcontractor. A Sears tech has checked the dishwasher out, and it was deemed to be operating properly.

                  Agreed, my water pressure is average.

                  Whatever valve was in the KDS-17 KitchenAid that washed the dishes in this house for 39 years, it never caused water hammer.

                  Comment


                  • #10
                    Re: Dishwasher install leads to water hammer

                    You can easily add a hammer arrestor under the sink at the dish washer water connection.
                    ANYONE CAN TAKE THE HELM WHEN THE SEA IS CALM.

                    Comment


                    • #11
                      Re: Dishwasher install leads to water hammer

                      Copper supply line?

                      Add the arrestor and yes, you have to pay for it if not specifically included in any contract or writing. Not included, most likely excluded. Labor and materials.

                      Good luck.

                      J.C.

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