PVC cement method

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by noobster, May 29, 2020.

  1. noobster

    noobster New Member

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    Jul 26, 2007
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    OK trying to redo handyman's shower drain mess....

    anyway, I watched how to prime and glue PVC together with the twist and hold method.

    my question is..how do you do that on the last connection when you cant twist it? will just a push and hold do?
     
  2. WorthFlorida

    WorthFlorida The wife is still training me.

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    Retired
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    Orlando, Florida
    Yes, the twist helps smear the adhesive and to not have any dry spots. It also allows the pipe to bottom out into the fitting just a little easier. The last piece make a 1" mark on the pipe, that is usually the minimum the pipe must be inserted into the fitting. Besure to glue both the pipe and fitting. Just don't over do it it with too much glue.
     
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  4. noobster

    noobster New Member

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    Got it! good idea...I knew that :rolleyes:

    thanks WorthFlorida
     
  5. noobster

    noobster New Member

    Joined:
    Jul 26, 2007
    Location:
    New Jersey
    sorry all..additional question:

    the vertical pipe I have to cut has some purple primer (can't tell if there's cement) on the whole pipe. 3 inches probably either drip or the guy went crazy.

    is it ok to re-cement that part or does it have ot be clean?
     
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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  7. noobster

    noobster New Member

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    Jul 26, 2007
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    New Jersey
    thanks
     
  8. Sam M

    Sam M Member

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    May 13, 2020
    Location:
    PA
    Make sure you hold the connection firmly for a few seconds as the cement has a tendency to push the fitting/pipe out before it dries. I usually hold it for 5-10 seconds.

    Purple primer is very runny and will get everywhere in a matter of seconds if you're not careful.
     
  9. fitter30

    fitter30 Well-Known Member

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    Peace valley missouri
    Purple or clear primer is the same. Purple is used mainly if the piping is getting inspected so inspector knows it was primed.
     
  10. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
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    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Primer etches, cleans, and starts to soften the plastic so that when you apply the cement, it can better do its job. So, while if you just used primer and shoved things together, you might end up with the pipe and fitting stuck together, it wouldn't be a full strong joint, nor would the dissolved plastic in the cement be there to fill in any imperfections and allow you to bottom out the pipe into the fitting the designed length easily, if at all . So, neither one alone will get you the designed seal.

    FWIW, depending on the geometry and whether things are anchored well, a joint can allow the pipe to move for well longer than 5-10 seconds. Keep in mind that the socket is tapered slightly (that's why you can't put the pipe in all the way until the cement softens it), that taper will try to eject the pipe from it until things are solidified. That can take longer than you might think in some situations. That can ruin your day if you need to step away for a few minutes and when you come back, things are out of whack and solidly attached as gravity or pressure moved things.
     
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