Adhesive/sealant use inside fresh water tank

Discussion in 'Tech/Mech General' started by johnandi, Jun 11, 2016.

  1. johnandi

    johnandi Funster

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    Can anyone advise please - I'm trying to join two pipes of slightly unequal diameters together (because I broke the top off the new water pump when fitting it!) as shown on the photo but having trouble getting a airtight seal. The non-return valve is directly above the reich pump. Hence we're:
    a) losing pressure from the taps which consequently takes a little while to build back up, and
    b) the air in the system is causing the hot water taps to splurt and cough before water is drawn back through the boiler.
    Question - are there any sealants/adhesives which are safe to use inside the fresh water tank since they will come into contact with the water (I'm assuming bathroom silicon sealant is not suitable?). Are stainless steel worm drive jubilee type clips suitable inside a tank?

    Thanks
    John
     

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  2. Lenny HB

    Lenny HB Funster

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    Any twin part epoxy should work but a new pump is only 40 quid not worth the hassle of trying to fix it.
     
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  3. tonyidle

    tonyidle Funster

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    If it's the black and blue pipes that leak where they're joined use 4 tie-wraps with their buckles at 90 degree intervals around the pipe to prevent leaks at the buckle 'flat-spots'. Or use a strip of cling film wrapped round the black pipe several times to increase its diameter and to act as a gasket. If the reason for doing this is a broken spigot on the one-way valve IIRC the valve can be removed & a new one fitted without damaging the pump. Mine is simply pushed hard onto the plain pump outlet.
     
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  4. JeanLuc

    JeanLuc Funster

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    Have a look at Leisure Shop Direct. They have the pump at £33.95 (with the NRV) and if you scroll down, you will see the screw collets (connectors) to seal the pipe to the pump and spigot in the tank cap (53p each).
    https://www.leisureshopdirect.com/water/caravan-water-pump/reich-pumps

    Then you need some 10mm internal diameter braided hose. Ideally, it needs to be about 17mm outside diameter but I could only find 16mm. I had to pack the outside slightly with PTFE plumbing tape to keep the screw collets secure. I got the pipe here:
    http://www.sealsdirect.co.uk/shopping.asp?intDepartmentId=6#48
     
  5. johnandi

    johnandi Funster

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    Thanks Lenny, I know, I should bite the bullet and just buy (yet another) pump - I think I'm actually coming to this conclusion. Was holding back cos the pump I've broken the top off 'was' only just bought. But, will put it down to experience and still cheaper than taking it to a repair guy.
     
  6. denisejoe

    denisejoe Funster Life Member

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    If necessary ct1
     
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  7. johnandi

    johnandi Funster

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    Thanks Tony. On this pump the NRV was (it say 'was' cos it isn't any more) not just pushed down onto the spigot of the pump but also glued. Managed to free and remove the NRV from the pump but the spigot is shorter than that on the old pump and not long enough to attach the Reich 'push-fit' NRV from the old pump.
    Therefore as said, will invest in another new pump - least I have this one as the spare which will never be used - probably!
    Thanks again,

    John
     
  8. johnandi

    johnandi Funster

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    Sorry, what's CT1 please? - maybe handy to have some in the toolkit for future *ock-ups!
     
  9. johnandi

    johnandi Funster

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    Thanks Jean-Luc,
    Think I've come to that conclusion - there's getting to be too many joints in this current arrangement.
    The advise above from Tony of using 2-part epoxy, 4 cable ties or cling film is well received though and I'll bear this in mind for future repairs.

    Good news is that I have a 5% discount voucher from Leisureshopdirect so that will soften the blow a little - and if Wales win today I'll consider I've had a good day!

    Thanks again.
    John
     
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  10. Jaws

    Jaws Funster Life Member

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    This is what I have used several times, and never had a fail !

    http://www.inest.co.uk/range.asp?typeid=2978&sizeID=&brand=R B Shelving

    It can be used on wet surfaces.. even under water !
     
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  11. johnandi

    johnandi Funster

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  12. Jaws

    Jaws Funster Life Member

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    I used to use stuff called ( from memory ) Atmosphere. It is similar to epoxy but again can be used on wet surfaces etc.
    Plumbers used to use it to repair leaking pipes that were still live
     
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  13. denisejoe

    denisejoe Funster Life Member

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