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High pressure coke drum cutting pump

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This topic contains 2 replies, has 3 voices, and was last updated by  Claus Graf 12 years, 5 months ago.

  • Author
  • #3064


    i recently have a huge problem with this pump.double failures in one week.
    this pump tripped due to high temperature on the bearing trust.
    have anyone had a similar problem and know the root cause of this.

  • #5794

    Claus Graf

    High concentration of coke fines will wear out internal clearances inside the pump, causing an increase (of thrust) and temperature on the bearing.
    Also a low flow condition (during bypass, below the pump minimum flow) can cause problems, too.

  • #5554

    Ken Osment

    Regardless of whether it was a progressive failure or a spontaneous failure thrust is a matter of pressure balance. Generally speaking thust bearing like steady state condition, they are hydrodynamically designed for a certain trust condition and do not tolerate rapid or excessive thrust loading. We have experienced both spontaneous and progressive thrust issues on our cutting pumps and the two predominant causes are progressive wearout due to erosive degradation, or rapid changes in flow to the process which is either due tothe valving switching suddenly or the cutting bit becomes plugged. To really nail the cause for you specific situation further information is required as trust bearing failure is almost always a symptomatic cause. 

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