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RE: When to bypass a drum


You can see all the picture about the cause of the trip, because if the perspective is that no recovery of the heater you should not be feeding for more than 15 minutes to the drum, becasuse if this feed  is not subject to the conditions of coking, it does not solidify and can create problems when cooling and unheading of the drum and you must at all times to ensure the admission of steam in order to ensure that no loss of channels inside the drum
Our experience with regard to this point has always been if you lose your heater, you must ensure that when you’ve regained the heater the materialo inside of the coke drum will be inside the coke drum at least 6 to 7 hours with a temperature above to the 805 F at the top of the drums so as to ensure coking of material inside the drum
In the case of loss of the feed to the drum, depending on the time that has been in operation, the first thing that is sure not to miss the channels inside the drum, you must to introduce steam to the drum immediately, and when you recovery the charge  introduced back to the drum, keeping the same criteria described about time and temperature (when you manipule the switch valve that must be done in steps ie stop and assess the input feed to the drum (see the bottom pressure and temperature so as to ensure that no clogging, antifoaming can be injected for several minutes prior to the change and after making sure your entry is removed vapor,

This has been our practice on several occasions without any problems, but each refiner must assess the application of these procedures
best regards

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