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Solvent Welding ABS Pipe - Insert or Insert & Twist ?

Discussion in 'Plumbing and Central Heating' started by WhatNext, 22 Feb 2021.

  1. WhatNext

    WhatNext

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    Hi

    Hope every one is well and staying safe.

    I need to modify an existing 40mm solvent pipe work and have a question.

    I have read that ABS fittings should have solvent applied to both the outside of the pipe and the inside of the fitting.

    I have also read that ABS fittings should not be twisted as this can cause them to leak, PVC fittings can be twisted when being assembled.

    Can anyone please comment ?

    Many thanks.
     
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  3. terryplumb

    terryplumb

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    Slight twisting when inserting is fine.
    Apply solvent cement to both outside pipe and inside fitting.
     
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  4. just pumps

    just pumps

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    If joining an elbow then line it up where you want it to be and mark a line on both elbow and pipe first.
     
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  5. Madrab

    Madrab

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    I give it a full twist then line up with marks, just ensures that the glue coats everything.
     
  6. Hugh Jaleak

    Hugh Jaleak

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    Keep a piece of rag handy to wipe off excess glue once joint is made.
     
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  8. Wayners

    Wayners

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    I give it a slight twist too. Lash on the weld and a slight twist. Always told not to but I ignore and do my own thing. Never had a leak
     
  9. durhamplumber

    durhamplumber

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    Yes.
    Never new that.
     
  10. durhamplumber

    durhamplumber

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    Lol....top line..
     
  11. Madrab

    Madrab

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    All I would add to that is that it isn't borne out in practice ... in the real world I find a twist is fine to ensure both faces coat well with cement.

    I never add glue to the fitting, just the pipe, (same as flux to copper) again in practice this has never caused an issue in all the years I have been doing it.
     
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