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Thread: Any plummers on here ?

  1. #1
    Forum Moderator FIL 4822's Avatar
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    Default Any plummers on here ?

    Plumming advice needed please.
    Since yesterday, whenever we use a tap, when it's turned off the pipes under the kitchen sink make a knocking noise. They aren't touching anything or each other, so i take it there must be an air in there or something.

    How do i cure this ?
    Thanks in advance.
    FIL.


    Have consideration for the deaf, if you're gunna fart, make it smell !


  2. #2
    Regular Member UltraVec's Avatar
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    Hi Fil,
    Im no plumber but are you sure its your water pipes?
    Id say loose connections. Check them.
    Could be water hammer from stopping the water suddenly.
    Or I'd make sure its not gas pipes if you have any, pressure to high.
    I'm sure there's some Pro Plumber who can help you.
    Regards

  3. #3
    Regular Member scotty84's Avatar
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    Default

    You had any plumbing work done Fil?
    In my experience its either water hammer......an length of unsupported pipe check to see if the pipes move. Try turning the main stop tap down just a touch to reduce the pressure. Other than that if you have a header tank in the loft your ball valve may need some attention......
    Let us know mate...

  4. #4
    Forum Moderator FIL 4822's Avatar
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    Quote Originally Posted by UltraVec View Post
    Hi Fil,
    Im no plumber but are you sure its your water pipes?
    Id say loose connections. Check them.
    Could be water hammer from stopping the water suddenly.
    Or I'd make sure its not gas pipes if you have any, pressure to high.
    I'm sure there's some Pro Plumber who can help you.
    Regards
    Quote Originally Posted by scotty84 View Post
    You had any plumbing work done Fil?
    In my experience its either water hammer......an length of unsupported pipe check to see if the pipes move. Try turning the main stop tap down just a touch to reduce the pressure. Other than that if you have a header tank in the loft your ball valve may need some attention......
    Let us know mate...
    Definitely water pipes. No loose connections, no work been done, no header tank in loft and i've tried turning the stop tap down, no difference.
    It thumps when turned on and there's a rhythmic rumble when it's turned off.


    Have consideration for the deaf, if you're gunna fart, make it smell !


  5. #5
    Ex-Staff Full Member John LE's Avatar
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    Agree with insecure pipes somewhere, any work carried out on the house recently?

  6. #6
    Regular Member scotty84's Avatar
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    Default

    It really sounds like water hammer to me Fil
    This is what water hammer is:

    The thud is caused by “Water Hammer”. What happens is that the valve or tap shuts suddenly resulting in a pressure wave travelling at the speed of sound back along the pipe until it hits an obstacle such as a bend or change in pipe direction.

    At this point the wave can either dissipate or it can be reflected, if it is reflected the noise can be akin to a machine gun as the wave bounces up and down the pipe. If the pipe is not securely fasten it can be ripped off its fixings.

    There are two approaches to resolve water hammer:

    1) Water hammer is related to the velocity of the water and slowing down the water flow can cure it. Try restricting the flow to the offending appliances or even closing the incoming stop tap a little.

    2) If this does not cure the problem have a water hammer or shock arrestor fitted,
    Pressure Reducing Valve (PRV) just after stop tap
    This absorbs the energy of the wave so that it is no longer a problem...They are about £10-£16 from a plumbing store/B & Q etc and a diy job.


    As I live in a modern house and my taps are mains fed I have them on All taps and toilet supply pipes. The only other thing that can make pipes thud is a dodgy washer in the tap, but this is unlikely as you said it happens if any tap is turned of.
    If you can get someone to turn tap off/on and find the pipe thats making the thud/vibration check if its moving at all (shaking).

  7. #7
    Regular Member 111's Avatar
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    Last edited by 111; 27th June 2011 at 11:09.

  8. #8
    Regular Member scotty84's Avatar
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    Default

    The reason I think its pressure related is you tried the reducing stop tap and it didnt work, turning the stop tap would just reduce the flow not the pressure as the pressure would still be constant.
    So as its not pipes banging against each other or on the wall etc, balll valve, no new plumbing works and it happens with all taps and its focused in the kitchen where the mains stop tap is normally located (im guessing yours is there).....I would say pressure problem and you need to fit a PRV. I can always come and fit it for you dude, just let me know. I did plumbing and heating for 4 years lol

  9. #9
    Forum Moderator FIL 4822's Avatar
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    Quote Originally Posted by scotty84 View Post
    2) If this does not cure the problem have a water hammer or shock arrestor fitted,
    Pressure Reducing Valve (PRV) just after stop tap

    This absorbs the energy of the wave so that it is no longer a problem...They are about £10-£16 from a plumbing store/B & Q etc and a diy job.

    As I live in a modern house and my taps are mains fed I have them on All taps and toilet supply pipes. The only other thing that can make pipes thud is a dodgy washer in the tap, but this is unlikely as you said it happens if any tap is turned of.
    If you can get someone to turn tap off/on and find the pipe thats making the thud/vibration check if its moving at all (shaking).
    Sounds like this will cure it. It's the cold water mains pipe thats shaking.

    Thanks chaps.


    Have consideration for the deaf, if you're gunna fart, make it smell !


  10. #10
    Regular Member 111's Avatar
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    I used one of these http://www.advancedwater.co.uk/prod-660-147-0706.html between the water supply and the washer, took about 20 mins to fit and works a treat, been in for about 3 years.

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