Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Black waste pipe versus white waste pipe

  • 19-09-2010 12:46pm
    #1
    Closed Accounts Posts: 5


    Hi All

    I am no plumber but ...

    I am replacing a shower tray. The old shower tray had the drain on the side in the middle. New shower tray has the drain in the corner. So I have had to shorten the waste pipe.

    The waste pipe is black but it had a section of white waste pipe (approx 20cm long) glued onto the end of it (see attached photo). I am guessing that the white waste pipe was heated so that the black pipe could be inserted into it (about 5cm) and glued with appropriate solvent.

    In order to shorten the waste pipe, I have cut this white pipe extension (which in hindsight might not have been a good idea!)

    Now I am trying to fix the black pipe to the shower trap. The problem is that the shower trap is designed to be fitted to white pipe with a compression joint. The black pipe is slightly narrower (2-3 mm?) than the white pipe and I am not confident of the join I have. It is reasonably tight but I can twist the trap if I apply enough force.

    My questions are: how tight should this join be? Should I consider attaching white pipe to the end of black pipe as the original plumber did?

    Thanks in advance

    J


Comments

  • Registered Users, Registered Users 2 Posts: 6,260 ✭✭✭Buford T Justice


    Have you checked for leaks by putting a bucket of water down the trap?


  • Closed Accounts Posts: 5 jdempsey


    I have poured water down the trap and all seems well. Once I put the shower tray in, I cannot access trap to test for leaks.


  • Registered Users, Registered Users 2 Posts: 6,260 ✭✭✭Buford T Justice


    If its a 1 1/2 waste pipe that's there, then the black pipe might be metric at 35mm or something. Can you measure it with a calipers?


  • Closed Accounts Posts: 5 jdempsey


    No calipers. Internal diameter of black pipe approx 35mm white pipe 40mm. Builders supplier (chadwicks) reckoned compression join would work. They gave me a slightly larger rubber seal. The join is reasonably tight but not impossible to move. I am wondering how it will perform over time...


  • Registered Users, Registered Users 2 Posts: 2,789 ✭✭✭slavetothegrind


    none of the marley compression joints are "impossible" to move, they should resist movement.
    At this stage the rubber seal is in compression between pipe and fitting and a seal is formed.


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    You will have no trouble with the black waste pipe and the white. Just sweat the white with a heat gun and pack in into the black. seal around it with plenty of solvent weld and make sure of course its slopeing away.


Advertisement