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mule ear leack

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This topic contains 6 replies, has 5 voices, and was last updated by  Claus Graf 11 years, 11 months ago.

  • Author
  • #2288


    after our last Maintenance for our heater, and during Hydro test we faced a several leaks from the mule ear, we opened them and polished the surface then we installed it back, i would like to know if there is any other way of servicing mule ear to ensure and to minimize the number of leaks ????
    Note: we have horizontal tube heater.

  • #5119

    Claus Graf

    Mule ear tip:
    Make sure you mark every plug location, so you can put it back in the same place after maintenance.


  • #5116


    before install we cover with a mix of oil and grafite when the tube is heat this mix seal the ear mule, we do not had any leak

  • #5107

    Mohammad Mashhadi

    please can you spicify which type of oil and grafite do you use?

  • #5069

    craig catton

    We’ve got the same problem. The manufacturer recommends using a high solids (nickel based) antiseize compound. Not so sure about use of graphite. Anyone else out there have some wisdom?

  • #5068


    we used oil and grafite in our coker heater for several years without any problem with leak

  • #5037

    Carlos Di Marco

    We have a serious problem in our coker heater. Every time we have to decoke or shut down the heater leaks appear and we are days trying to stop them. Maintenance people use grafoil tape to seal the mule ear. Despite this seems to work, the seal is not good enough and when we feed the heater, the mule ear leaks until they coke.
    Can anyone tell me about that mixture of oil and grafite? In which proportions do you mix them? or is there a procedure for repairing the return bends?
    Id very appreciated if you can help me.
    Other thing… Does anyone have a procedure for pressure-test the fired heater?
    Thank you very much!!

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