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Fittings used in transfer line

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This topic contains 3 replies, has 2 voices, and was last updated by  Claus Graf 13 years, 1 month ago.

  • Author
  • #2940

    Freddy Martinez

    To minimize fouling, what fitting is used for bends to change direction of transfer line.  Would a long radius 90 deg elbow have an advantage over a tee?  Would two 45 deg be preferred over a 90?  Ease of cleaning should also be considered.  Is there a best practice for this, and is so what is it?

  • #5963

    Claus Graf

    It depends on factors such as material availability, plant preference and access location.
    Crosses with two blind flanges allow cleaning in two directions, while a tee (with 1 blind flange) will allow cleaning in only one direction. Flanged 90 degree elbows allow cleaning in two directions, but are more difficult to unblolt from the piping compared to a blind flange. (depending on the piping layout, you might require temporary supports).
    Coke will build up inside of the pipe. I have seen 1-1/2 inch buildup inside the transfer line.

  • #5960


    The use of tee with one blind flange is common practice (they do allow cleaning in two directions!)

  • #5955


    In our transfer line, the coke buildup is thicker in the area just before and just after the 90 degree turns.  Our thinking was that perhaps the 90 creates back mixing that could increase coke formation in these areas.  Your thoughts?

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