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Reply To: Process Availability

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Evan Hyde


There are as many answers to this question as there are stars in the sky but a common list includes

+ Delay in cycle step causing temporary slow down
+ Decoking or coke handling equipment failure
+ Structure valve issues
+ Heater Fouling and subsequent decoking

RE cycle time reduction, the lowest cycle time I’m aware of was 9 hours between switches. There are many sites which operate on a 12 hour cycle while 16 hours is a typical design basis. It would be impossible to document all the scenarios of debottlenecking to achieve shorter cycle time but the obvious ones include:

+ Fractionator loading
+ Heater duty and fouling
+ Drum cycle step reduction
+ Compressor loading
+ Heat integration (preheat, P/A, cooling, etc)

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