Why does my expansion tank overflow?

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  • This topic has 2 replies, 3 voices, and was last updated 21 years ago by SylvanLMP.
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    • #273452
      MasterPlumbers
      Keymaster

      Whoever it may concern,

      I have recently found that my expansion tank is regularly overflowing when a cold tap in the house is turned on.
      Why is this?
      Please help.
      Mr.Stev

    • #287727
      Guest
      Participant

      All of your taps are connected together and water velocity started by the tap water movement creates enertia to overflow the tank.

    • #287728
      SylvanLMP
      Participant

      Your expansion tank is water logged.

      When you close a valve the sudden stopping of this water sets up a shock wave where no place for this shock wave to dissipate so the relief valve takes the hit and odes its job.

      Now you didn’t say what type of expansion tank you have so what ever it is have the air space replenished or replace this tank.

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