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Joining lead pipe to plastic then to copper...

Discussion in 'Plumbing and Central Heating' started by Michl, 9 Apr 2014.

  1. Michl

    Michl

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    I want to cut out a section of my lead hot water pipe and replace with plastic. The lead pipe has one pinhole leak and another leak where it joins the copper pipe (see picture; the tape is redirecting the leak from the join). Plastic would be preferable as the section from the lead to the copper is not quite a straight line. My question is, are the 'lead to copper' fittings (eg Leadloc) compatible with plastic (with inserts in the plastic)? Are they only suitable for the blue MDPE plastic or can they be used with standard grey barrier pipe?

    The lead pipe is large; diameter is 1 5/16", the copper pipe is 22mm.

    PS I can't simply replace all the lead due as I'd have to replace all the flooring...
     
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  3. Charnwood

    Charnwood

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    Speedfit Universal Transition Coupler http://www.philmac.co.uk/products/details/?type=2&sub=35 then a 22mm x 3/4" female adaptor.

    Leadlock will work with barrier pipe of the correct size (some do not follow copper sizes) but whichever option you choose you will need to use the correct insert for the pipe, not the fitting.
     
  4. Michl

    Michl

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    I phoned Philmac's technical help, they advised all their products were for cold water only... This is for a hot water pipe.
     
  5. stardanny

    stardanny

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    Replaced lead pipes with speedfit, can go different way, does not have to go where lead pipe goes. Better than having more pinholes leaks in future.

    Is the flooring tongue and groove? Why can't you get under flooring ?

    Daniel.
     
  6. Charnwood

    Charnwood

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    :oops: Whoops, sorry. Missed the 'hot'.
     
  7. Charnwood

    Charnwood

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  9. Michl

    Michl

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    I wish... It's on its way to the bathroom so I'd have to rip up the kitchen floor then the hallway then the bathroom. However, I could easily run it through the loft then back in through the bathroom ceiling! The only drawback being heat loss, probably insignificant if I insulate the pipe well... I am considering this.
     
  10. Onetap

    Onetap

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    Lead-loc, good up to 80 degC, joims to metal or plastic.
    http://www.melimatic.com/4.html

    You need to replace the lead, but you know that. There's something in the Water Regulations about the galvanic series and the sequence in which you can connect different metals, but I don't recall which way it goes. The copper would tend to perforate from fragments of lead.

    If the lead pipe has pinholed in one place, it may be leaking under the floor, which could cause huge problems.
     
  11. Michl

    Michl

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    As far as I can see Leadloc only accommodates up to 3/4" lead pipe, mine is much larger ie; 1 5/16"
     
  12. Nige F

    Nige F

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    I can`t remember the sequence either - but copper is ok with lead - copper nails used with lead sheet ;)
     
  13. Michl

    Michl

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    http://www.melimatic.com/26.html

    Actually this chart says '3/4" lead pipe' has a diameter of 1.233". I could shave the pipe down to this and use a 3/4" 11lb fitting, this would be great... hopefully I can find a supplier!
     
  14. Charnwood

    Charnwood

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    There is a metal adaptor for 1" 16lb lead which is for OD roughly 11/2". It goes to 11/2" female BSP. It's called Leadline.
     
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