water hammer when I do nothing!

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    • #275300
      MasterPlumbers
      Keymaster

      I’ve had a 4-8 knock banging (repeating 3-7 times with 2-5 minute intervals) at odd times during night and/or day. I can’t create the noise through any use of water in my single story apartment. It started 5 months ago.

      I have a hole in the wall at main shut off and can put my hand on the main water pipe to feel this banging. Pipe isn’t loose. I have a pressure reducing valve on which is 1 year old.

      What is going on? My regular plumbers are stumped.

    • #291646
      SylvanLMP
      Participant

      Check your toilets for a quick closing valve like a Fluidmaster 400A

      Also re check your PRV as at night pressure does increase as less folks are using the water



      SylvanLMP

    • #291647
      bungie
      Participant

      Could be comming from your next door unit



      DISCLAIMER

      All advice is given with-out seeing the job, and hence all advice MUST be taken as advice with limited knowledge on the exact situation. NO responsibility can or
      will be taken. And yes, I am a licensed plumber with my own business in Brisbane Australia

    • #291648
      johnws
      Participant

      Another thing to check is the incoming water pressure. If the pressure is at times less than the set pressure of the pressure reducing valve then this can happen. To overcome this – reduce the set pressure of the valve (if it is adjustable) to below the inlet pressure.

    • #291649
      bungie
      Participant

      Click on this link, use the info to pin the tap in the wall, might help

      ENSURE THE WATER IS OFF FOR THIS WORK !!!!



      DISCLAIMER

      All advice is given with-out seeing the job, and hence all advice MUST be taken as advice with limited knowledge on the exact situation. NO responsibility can or
      will be taken. And yes, I am a licensed plumber with my own business in Brisbane Australia

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