main water pipe knocking

Discussion in 'Plumbing and Central Heating' started by SimonWrightuk, 17 Dec 2011.

  1. SimonWrightuk

    SimonWrightuk

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    the main water pipes knocks all day on and off. Knocks for about 5 mins then stops. Sounds like the water in the pipe is being sucked and pushed which causes the knocking. However if I turn it off at the stopcock the knocking stops. Would be most grateful for an answer to this problem.
     
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  3. HERTS P&D

    HERTS P&D

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    Check the float valve in the loft (if you have one) and check that the pipe is securely fixed.

    Andy
     
  4. SimonWrightuk

    SimonWrightuk

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    No float matey. got a combi. Pipe seems to be firmly fixed throughout. But thanks for your advice. :)
     
  5. HERTS P&D

    HERTS P&D

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    Faulty float valve to toilet?

    Andy
     
  6. Whitespirit66

    Whitespirit66

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    Check that the washer in the stop tap is OK.

    Had this recently, where if you turned on a tap, it sounded like someone was firing a machine gun. The washer had perished away, and the brass jumper (the bit that the washer seats on) was banging against it's seat.
     
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  8. SimonWrightuk

    SimonWrightuk

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    Good answer defo worth looking at. But where do I turn the water off to check the stopcock?
     
  9. Whitespirit66

    Whitespirit66

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    You will need to turn the main outside stop tap off first. Then, attach a hose to the drain off cock near the internal stop tap, drain water out of pipes above tap, then remove tap's head.
     
  10. SimonWrightuk

    SimonWrightuk

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    Ok, many thanks. Will have to see if I can find it. Have a nice Christmas. :)
     
  11. yerino

    yerino

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    Turn the pressure down a bit via your mains water stopcock.
     
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