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  • Users: July
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  1. July

    Liquid holdup in distillation column

    I regret I seem to have not made my question clear. The preflash column bottoms is fed to a furnace and from there to the atmospheric distillation column. The atmospheric column bottoms is fed to a Vacuum unit furnace. My query was about the minimum residence time requirements for the column...
  2. July

    Liquid holdup in distillation column

    I am reviewing the column liquid holdup requirements for different services. What is the criteria governing liquid holdup in an atmospheric distillation column upstream of a furnace? What are acceptable minimum residence times? What residence times are used in a vacuum column? I look forward...
  3. July

    Ammonia stripper

    glorant, Linde in Germany should meet your requirements.
  4. July

    Atmospheric residue filter plugging

    What is the BS&W of the crude? It appears you do not have a desalter. A desalter will not only remove salts but also any sludge carried with the crude.
  5. July

    Since 1970 we operate a VCM plant w

    Are you located in a cold climate?
  6. July

    Disposal of refinery slops / sludge

    Refinery slops would be different from sludge. Refinery slops would normally be reprocessed in the Crude unit at a controlled rate. Sludge disposal is a different issue.
  7. July

    Cooling Water Quality

    What is the source of your water? I would tend to agree with jcd, kenvlach and 25362. Backwash facilities on the condenser would also help.
  8. July

    Diolefin Saturation Reactor

    I think you are taking a chance by not having the diolefine reactor in line. There can be diolefines carryover to the next reactor with consequent catalyst fouling and reduced catalyst life. Are you sure that your heavy coker naphtha does not contain diolefines? I would be very surprised if it...
  9. July

    Desalter Effluent Water Low pH

    We used to operate with 2 caustic injection points - 1 at the crude pump suction and the other in the preheat train before the desalter and didn't face problems.
  10. July

    Distillation Tower Flooding

    I agree with Greg. You will see poor separation in the flooded sections as well as minimal temperature differences.
  11. July

    Reciprocating & centrifugal compressors maintenance cost

    Typically maintenance costs on reciprocating machines are more than for centrifugals. If you are comparing the 2 options, this could be a factorto be considered. In fact there sre systems where we provide no spares for a centrifugal machine but the reciprocating machines are spared.
  12. July

    Crude Distillation

    I agree with kbander. Typically the kero flash is a controlled by steam to the side stripper and the freeze point, FBP are controlled by adjustment of kero drawoff rate.
  13. July

    Hydrotreating

    Does anybody have operating experience with liquid quench applications in Naphtha Hydrotreaters?
  14. July

    Pipe rack fire

    Yes, I have experience with a pipe rack fire in a refinery. The refinery had to be shutdown for almost 1 month. It was a difficult exercise to identify all the lines from the drawings. we had to physically trace the lines before identifying them so that the connections were made correctly. Some...

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