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Coke causing tube failure

Home Forums Coking Technical Fractionation & Process Process Coke causing tube failure

This topic contains 4 replies, has 4 voices, and was last updated by  Anonymous 11 years ago.

  • Author
  • #2070


    I have been told recently that if an exchanger tube were to plug completely by coking shut that the coke will harden with time and expand, rupturing the tube.  Has anyone seen or heard of this property of coke, that it will expand and harden with time at high temperature?

  • #4849


    you are talking about heater or exchanger ?what kind of exchanger ? which are the fluid tube and shell?

  • #4699


    Coker feed preheat exchanger, vac resid on tube side, hot oil on shell

  • #4673

    Claus Graf

    Where did the tubes break?

  • #4672


    I know of 1 example where coke formed due to di-olefin polymerization of naphtha on the shell side causing the bundle to swell significantly. However, the tubes did not fail as a result. Therefore, it may be possible in an extreme case but is seems unlikely. You would likely need a shut-in condition of the resid side with heat input (HKGO) still flowing for a long time to cause a tube failure.

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