Recent content by July

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...

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...

glorant, Linde in Germany should meet your requirements.

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.

Are you located in a cold climate?

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.

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.

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...

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.

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

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.

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.

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

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...