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Fitting an American water hammer arrestor to UK washing machine.

Discussion in 'Plumbing and Central Heating' started by eternaloptimist1, 27 Oct 2015.

  1. eternaloptimist1

    eternaloptimist1

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    I want to fit a water hammer arrestor

    http://www.amazon.com/Sioux-Chief-Mfg-660-H-4-Inch/dp/B000H5MQNM
    Picture is appended below.
    It has 3/4 inch male and female threads to connect to the washing machine valve and the washing machine hose. Likelihood is that the threads are American. Can anyone please tell me if this will mate happily with our UK 3/4 inch BSP threaded connectors.

    chief.jpeg
     
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  3. Burnerman

    Burnerman

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    Wouldn't Toolstations 85345 or 64117 make life easier for you?
    John :)
     
  4. eternaloptimist1

    eternaloptimist1

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    Thanks for your reply. The 64117 has not helped. The model I am considering is mounted on the machine itself and has a better chance of absorbing the shock. To install it, you undo the hose at the washing machine end and connect the female end of the arrestor directly to the washing machine. You then attach the hose to the male end of the arrestor. When the washer stops taking water, the momentum of the flowing water pushes the piston (the piston is in line with the incoming water) in the arrestor. I think this model mounted in this way has a good chance of arresting the shock.
     
    Last edited: 27 Oct 2015
  5. Burnerman

    Burnerman

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    Isn't 64117 the same thing......I guess it could be mounted either at the tap end, or the machine end? As far as I know, its just a split chamber with a diaphragm in the middle and air on one side of it.
    John
     
  6. eternaloptimist1

    eternaloptimist1

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    Thanks for your reply. Yes it could be mounted on the washing machine, but when the water is shut down, in the model that I am considering, the piston is in line with the incoming water and ought to catch the full flow of water. I have got the 64117 installed right now but it isn't fully effective because I dont think it catches the full flow. Don't think I have explained this very well.
     
  7. Burnerman

    Burnerman

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    I see what you mean.....I guess you just need a bigger arrestor, or maybe more on the system. Sorry I can't help with your initial query!
    John :)
     
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  8. eternaloptimist1

    eternaloptimist1

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    Thanks. A bigger arrestor is not very easy to accommodate due to mounting restrictions but if that's what has to be done, that is what I will do. The problem has arisen due to two factors. The water inlet used to be from low pressure from a cold water system but now is directly from the mains. Added to that is a new washing machine which has a fierce shut off. Additionally, the damn thing takes in water in dribs and drabs instead of one fell swoop. Most annoying.
     
    Last edited: 27 Oct 2015
  9. footprints

    footprints

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    I remember reading that while many countries use BSP the US uses NPT I found this there are minor differences in the 3/4 pipe Dia it might be possible to interchange them with a bit of
    "graunching" but they are not exactly the same.
    Have a look at this chart.
    https://www.valvesonline.com.au/references/threads/
     
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  11. eternaloptimist1

    eternaloptimist1

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    Thanks.
     
  12. bernardgreen

    bernardgreen

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    For a washing machine a home made arrestor will normally suffice

    . hammer stop.jpg

    After time the trapped air will have dissolved into the water. Then close then isolator, loosen the connection to the washing machine hose to drain the water out of the 22 mm section. That replaces the trapped air cushion.
     
    Last edited: 27 Oct 2015
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  13. eternaloptimist1

    eternaloptimist1

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    Thanks. If all else fails, I will try this. Only reservation I have is the periodic draining of the tube, but it sure is a simple and workable solution. Indeed I believe in the USA many homes had these built into the plumbing systems.Another alternative for me would be to revert to my low pressure system.
     
  14. Madrab

    Madrab

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    Can I assume you have watter hammer from your washing machine valve closing?

    Have you looked into what is causing the issue? Loose pipework, pressure too high etc? Most of these issue can be rectified by other means.
     
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  15. bernardgreen

    bernardgreen

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    The only way to prevent the hydraulic shock wave is to slow the closing operation of the valve. Fixing the pipe work tightly doesn't prevent water hammer, it only masks the symptoms of the effect the shock wave has on the pipe work.
     
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  16. Madrab

    Madrab

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    I do agree, though it can depend on how bad the hammer is, if it's slight then a sympathetic vibration from loose pipework can amplify the hammer and make it seem worse than it actually is.
    Replacing the valve or reducing the pressure feeding the appliance can also significantly reduce or completely remove it, in my experience. I have been in situations where arrestors haven't worked, especially with washing machines/dishwashers and replacing the valve or reducing the pressure has been the solution.
     
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  17. eternaloptimist1

    eternaloptimist1

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    There was no problem when I had low pressure system. The cold taps and washing machine supply were fed from the cold water cistern. I dare say there are pipes under the floor which are not supported as well as they ought to be, but that will be a job for the future. Although closing some taps quickly does produce a noise, I can control how I close them and avoid the banging. As far as the washer goes, I can reduce the effect by reducing the flow but then it complains that the water tap is turned off!
     
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