+ Reply to Thread
Results 1 to 6 of 6
  1. #1
    Join Date
    Aug 2008
    Posts
    1

    Default Knocking cold water pipe

    After installing lawn sprinklers there is knocking/tapping/ ticking noise whenever the water runs. At any time of the day. Sprinklers, washing maching, toilet, shower, etc. all cause this noise. (All not running at the same time.) The noise seems to be coming from the main line just after the meter (behind a wall, of course.) It's a "newer" house, 15years old. I've searched other threads and they are related to hot water pipes, radiators or remodeled homes, none of which apply. Any ideas?

  2. #2
    Join Date
    May 2009
    Posts
    1

    Default Re: Knocking cold water pipe

    A ticking noise on water pipes sounds like a meter or water hammer. if some part of the system is turning on and off it could be water hammer. To eliminate water hammer requires having a cushion in the line close to the location of the valve. This cushion can be an air pocket. Some house system will place a capped pipe in the wall to capture the air for that cushion. others will have diaphragm pressure sections to provide the same cushion. With the air pocket system the air will dissolve into the water over time and will need to be restored every so often by draining the water out of the pipes and refilling the system so that the air can refill the pockets. this will quite down the whole system although the faucets will spit the air until the excess air is out of the system. If the noise is coming from the sprinkler system you may need to install one of the suppression devices in the sprinkler line or add a capped end where air can be captured to cushion the inertia of the water as the sprinkler creates pressure surges in the line.

  3. #3
    Join Date
    Jun 2007
    Location
    West Jordan, Utah
    Posts
    84

    Default Re: Knocking cold water pipe

    This sounds like a noisy water meter, does the rate of the ticking change with the rate of water flow? Adding an irrigation system may have increased the flow of water in the service line allowing sediment to move into the water meter causing the noise. If it is a noisy meter your water department may be able to help eliminate the noise by cleaning the meter, replacing the metering chamber or replacing the meter.
    Last edited by Blake; 05-15-2009 at 11:17 PM.
    Slow The Flow

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

    Default Re: Knocking cold water pipe

    I would have to agree with checking the water meter.
    Ran across this recently .... the sound was a surging or ticking sound especially when a high volume water flow like a toilet. Finally traced it to the water meter being the source and was amplified through the copper supply from the meter.

    Don't know about the sediment though ... you might think sediment would show up in the sinks or a glass of water..
    "" an ounce of perception -- a pound of obscure "
    - Rush

  5. #5
    Join Date
    Jun 2007
    Location
    West Jordan, Utah
    Posts
    84

    Default Re: Knocking cold water pipe

    Quote Originally Posted by canuk View Post
    Don't know about the sediment though ... you might think sediment would show up in the sinks or a glass of water..
    The tolerances in a piston type water meter are tight and occasionally a piece of sediment gets trapped between the piston and the wall of the metering chamber, this can cause the piston to hit the wall and cause a ticking sound.
    Slow The Flow

  6. #6
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Knocking cold water pipe

    Quote Originally Posted by Blake View Post
    The tolerances in a piston type water meter are tight and occasionally a piece of sediment gets trapped between the piston and the wall of the metering chamber, this can cause the piston to hit the wall and cause a ticking sound.
    Okey dokey
    "" an ounce of perception -- a pound of obscure "
    - Rush

Tags for this Thread

Posting Permissions

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