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PTFE failure of Cross Joint - PP lined steel

  • 1.  PTFE failure of Cross Joint - PP lined steel

    Posted 06-17-2020 11:32 AM

    Hello, Aamir,

     

    I echo Mr. Bernhard Rijpkema's idea of this being PP.  I have worked on polypropylene lined fitting failures that developed due to severe temperature cycles.  The idea would be easy to check:  if you place a small section of the failed liner in distilled water, it should float (density <1).  Instead, PTFE and PFA sink very quickly (density >2). 

     

    Ana Benz, P.Eng.

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    From: Pradip Khaladkar via Materials Technology Institute Inc <Mail@ConnectedCommunity.org>
    Sent: Wednesday, June 17, 2020 8:50 AM
    To: Ana Benz <Ana.Benz@irisndt.com>
    Subject: RE: ASK MTI : PTFE failure of Cross Joint

     

    If it is PTFE (this can be confirmed by analytical tests) then one possibility is an extremely poor sintering.  I did come across a case of poorly...

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    Re: PTFE failure of Cross Joint

    Jun 17, 2020 10:48 AM

    Pradip Khaladkar

    If it is PTFE (this can be confirmed by analytical tests) then one possibility is an extremely poor sintering.  I did come across a case of poorly sintered lined pipe spool which looked like this. Also the lining thickness looks to be too high. I can't be sure from the picture.

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    Pradip Khaladkar
    Fellow and Associate Director
    MTI
    DE
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