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Fines in Cutting Water

This topic contains 8 replies, has 6 voices, and was last updated by  Anonymous 12 years, 6 months ago.

  • Author
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  • #4334

    Dan Statile
    Participant

    Does anyone out there have a specification for the acceptable amount of fines in the cutting water?

    We are experiencing excessive balance drum wear on the cutting water pump that leads to thrust problem. Fines have been so excessive that the amount of packed fines has seized the pump.

    Dan

  • #7766

    Anonymous

    750 – 1000 wppm is normally the max spec from the standpoint of longterm erosion. Many find this tough to meet.

  • #6249

    Anonymous

    anyone have any feedback?

  • #6248

    Anonymous

    What is the maximum particle size that starts to cause issues?  100 microns?

  • #6242

    Desh 562001
    Member

    Are the observations after installation of hydrocyclones? Since some of the Licensing Technologies recommend their installation whereas others do not…….Thanks

  • #6237

    Claus Graf
    Participant
  • #6234

    Lucibar Davalillo
    Participant

    In my last coker AOS performed a three months cutting/quench water corrosive and erosive evaluation; findings indicated no issues with coke fines (suspended solids were below 50 wppm), but corrosion rates were high (high 45 – low 35 mpy, as measured by corrosion coupons)
    Id suggest working towards getting rid-off of additional fines production; few areas to start looking include watching cutting process techniques, like cutting too fast and/or poor cutting nozzle condition. There also key operational requirements, like using 2-3 ft coke dams in front of the water drains at the end of the coke pit to improve maze efficiency by keeping fines/foam out of the maze. You may also consider watching/sampling whats coming out of your tank when draining and evaluating either frequency or how hard you dump water back to maze; of course, once your tank is full of coke, then it may be better cleaning it out before starting putting in place any new measures. One more area to look for is your heaters; either bad fighting, flame impeachment or simply poor operation due to high asphaltene feedstock, could lead to bad coke formation and/or fueling further fines generation.
    None Delayed Cokers I have been deal with excessive coke fines in water nor using hydroclones; the only one Im aware using Hydroclones is for Slurry made in Flexicoker units; so, just adding hydroclones may not be the solution if the root cause has not been detected and eliminated.
    Lucky

  • #6209

    there is an articule en hydrocarbon processing Mayo 2008 (improving decoking water system reliability in delayed coker unit),

  • #6173

    Anonymous

    We do not use hydrocyclone for fines removal.
    We use vacuum filter.
    It is good machine in this application.

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