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Copper soil pipe - how to make a connection

Discussion in 'Plumbing and Central Heating' started by MattWills, 28 Apr 2009.

  1. MattWills

    MattWills

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    Just been asked if I could plumb in a washing machine into an outhouse that backs on to another smaller outhouse which has a WC in already.

    In theory not a problem. Cold supply is off a tank on the first floor so obviously the fill will be slower than if connected to the mains, but my friend says she can live with that.

    The issue is the waste. I was just envisaging replacing a 90 degree WC pan connector with one with a universal pipe boss (like the McAlpine WC-CON8V) and bring the w/m waste pipe through the adjoining wall and into that connector. However, when I got to look at it I found that the pan outlet itself goes 'up and over' and straight down into the drain connector, i.e. there is no pan connector.

    As the loo is pretty old and grotty, I'm tempted to suggest that she buys a new loo while she's at it and then I could use the pan connector as described above.

    However, there is another option. In the corner of the WC room is a 3.5 inch copper soil pipe (1950s plumbing I'm guessing) which descends from the bathroom above. I was just wondering if anybody had any suggestions for teeing the w/m waste into this. Is there an (inexpensive - i.e. not Viking Johnson etc!) adaptor for connecting plastic pipe into copper soil pipe?

    At the moment, the loo replacement option looks like it might prove to be most straightforward and possibly even the cheapest option, but I wanted to get some other opinions first. (Another thing is that the copper pipe is jammed in the corner of the room so I'd have to excavate the walls a little in order to make a connection.)

    Thanks in advance
     
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  3. doitall

    doitall

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    A proper plumber would drill a hole in the pipe, and bell it out using a bent pin, then they would bronze weld the new copper waste pipe into the dish.

    Alternatively they would form a saddle and silver solder it to the pipe.

    :rolleyes:
     
  4. MattWills

    MattWills

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    Thanks Doitall, yes, I've seen that technique described elsewhere but I certainly wouldn't feel competent to attempt it myself. What I'll probably do is give my friend a price for the toilet replacement approach, but suggest she gets a 'proper' plumber in who could quote her for the 'old school' method.

    I'll tell her that it's very important that she check with him whether or not he has a bentpin!
     
  5. doitall

    doitall

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    Your best bet is to either form a saddle or buy one if you still can, and silver solder it.

    If you shape the end of the waste pipe to fit the soil pipe, you can heat it up to cherry red and shape the end to form a saddle.
     
  6. MattWills

    MattWills

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    Hmm....

    I think that's one of those techniques I'd like to see demonstrated before attempting it myself and making a pig's ear of it. If she does get someone in to do it that way I might ask him if he minded if I observed!
     
  7. BingoBongo

    BingoBongo

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  8. MattWills

    MattWills

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    I've seen a similar thread on another forum where someone suggests using a strap-on boss - with the ridge filed off - and sealing it to the copper soil pipe with silicone. Says he's had success with this approach on cast iron soil pipe.
     
  9. doitall

    doitall

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    Why bodge when it's simple enough to do the job properly.

    Silver soldering is no harder than normal soldering, if you wanted to you could cut a tee down lengthways to form the saddle.

    See the link it may give you a few ideas.

    http://www.tubenet.org.uk/technical/bill1.html
     
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  11. MattWills

    MattWills

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    Thanks for the info Doitall...

    I certainly don't want to bodge it which is why I'll recommend to my friend that she finds an experienced pro to give her a quote for doing it that way. I'm sure it is, as you describe, simple enough to do this the right way ... IF you know what you're doing.

    Cheers
    Matt
     
  12. Razor900

    Razor900

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    Perhaps you should listen to the old fella and tell her to get a washboard and a mangle!

    Or get into this century and use one of these

    ;)
     
  13. doitall

    doitall

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    Typical young pup :LOL:

    Even the link don't work. :rolleyes:
     
  14. Razor900

    Razor900

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    Oops, it was there when I looked :oops:


    Perhaps you should just Google 'Bossconn' instead!


    Damn new computers you knew where you were with a sliderule ;)
     
  15. MattWills

    MattWills

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    So Doitall, what is your considered opinion of the Young Pup's suggestion?!

    I could only see an overflow pipe size connector on McAlpine's website Razor. Is there something similar for 32 or 40mm waste pipe?
     
  16. doitall

    doitall

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    I don't know of any fitting that will go onto a 4" copper pipe as a saddle.

    As I said perhaps the simplest way is get an 42mm copper tee, cut it down the center and silver solder it to the pipe.

    Of course if you don't mind a small pipe, just drill a hole and fit an 28mm Essex flange. ;)
     
  17. DIYnot Local

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