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Recent Questions
Date  Replies
16/01/2018 Q: How to calculate vacuum heater residence time? What is the limit to avoid coking? (2)
14/01/2018 Q: How can we calculate the draw off temperatures of Kerosene and diesel to be with drawn from CDU? Similarly what would be the procedure in case of LVGO and HVGO in case of Vacuum Distillation? (1)
14/01/2018 Q: In our FCC 4 PDT A,B,C,D are provide to show RCSV Differential pressure , all PDTs are N2 purged with flow orifice and flow orifice bypass. from some days we are facing dp problems in C and D. If we are open flow orifice bypass of C and D than DP maintain and when we are close flow orifice bypass DP disturb of C and D.
What may be reason?
(1)
09/01/2018 Q: Recently we have done the skimming of NHT reactor and now want to reuse all the actispheres that has been removed from the top layer of catalyst bed . So, is there any problem to clean it by dissolving into the Heavy Naphtha and inert it with the N2 before reusing in the reactor again?  
04/01/2018 Q: Is there any quick method for theoretical estimation of hydrogen production from UOP R-56 platforming unit?
We are facing the problem of high LPG production (Higher cracking rate & lower delta T in the last reactor) after the second cycle. We tried to adjust Chloride and condensate injection rate but couldn't get the desired output. Does the regeneration effectiveness cause these changes?
One more thing, during the reduction in the regeneration, water produces through hydrogen reaction with the oxidized catalyst. My question is how do we know when to stop reduction?

@Ralph Ragsdale
We regenerate our unit 10 months back. and from the beginning, we are facing high LPG production problem. I believe our system is wet but don't know why. might be the improper regeneration. water production during regeneration is what I worried about. I think we didn't drain water up to the required limit. Only because we couldn't find any limits in the first place in Manuals.
(3)
Recently Answered Questions
Date  Replies
16/01/2018 Q: How to calculate vacuum heater residence time? What is the limit to avoid coking? (2)
28/12/2017 Q: i have corrosion problem in overhead system reflux pump and accumulator this system consist of atmospheric tower and overhead condenser (4 bundles with crude in tube side) then accumulator with water boot the and reflux pump to atmospheric again. we just add corrosion inhibitor in overhead line without neutralizing amine due to old recommendation based on high accumulator temperature. temp in accumulator 115-130 c and pressure 1.1-1.4 barg .note that no water accumulated in vessel boot . (6)
14/01/2018 Q: In our FCC 4 PDT A,B,C,D are provide to show RCSV Differential pressure , all PDTs are N2 purged with flow orifice and flow orifice bypass. from some days we are facing dp problems in C and D. If we are open flow orifice bypass of C and D than DP maintain and when we are close flow orifice bypass DP disturb of C and D.
What may be reason?
(1)
14/01/2018 Q: How can we calculate the draw off temperatures of Kerosene and diesel to be with drawn from CDU? Similarly what would be the procedure in case of LVGO and HVGO in case of Vacuum Distillation? (1)
04/01/2018 Q: Is there any quick method for theoretical estimation of hydrogen production from UOP R-56 platforming unit?
We are facing the problem of high LPG production (Higher cracking rate & lower delta T in the last reactor) after the second cycle. We tried to adjust Chloride and condensate injection rate but couldn't get the desired output. Does the regeneration effectiveness cause these changes?
One more thing, during the reduction in the regeneration, water produces through hydrogen reaction with the oxidized catalyst. My question is how do we know when to stop reduction?

@Ralph Ragsdale
We regenerate our unit 10 months back. and from the beginning, we are facing high LPG production problem. I believe our system is wet but don't know why. might be the improper regeneration. water production during regeneration is what I worried about. I think we didn't drain water up to the required limit. Only because we couldn't find any limits in the first place in Manuals.
(3)
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