[daniel samuel]

my understanding is that you will get better quality of gas oil, because this feed will act as an additional wash, but at the cost of higher recycle.

[daniel samuel]

karthik, seems u have started facing typical coker problems…

please check

All Forums >> [Drilling, Cooling/Quenching, Water, Sludge, Fines, Cutting] >> Cutting >> Stuck Drill Stem

[daniel samuel]

senthil,
maintaining same flow in each pass of coker heater is little difficult due to constarints like tube skin temerature and inlet pressure will be different for each pass. if you implement pass balancing in dcs it may need manual intervention like bias value (mainly at the end of run). Normally this pass balancing is implemented in APC which takes care of these constraints.

daniel

[daniel samuel]

what is your heater outlet temperature?

[daniel samuel]

thank you for your reply.
Fire proofing of the coke drum steel structure will have any adverse effect?
 
daniel

[daniel samuel]

Hope everything went well !
Please share your experience!

 

[daniel samuel]

what is your cross over temperature, if its less than 400 degC then u don’t have much problem provided u are maintaining the velocity.

[daniel samuel]

never heard a mov on the downstream of drum psv (any psv)

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