A delayed coker combination tower is similar in design and function to an ordinary crude distillation tower; heat is removed and products are fractionated. Referring…
Coke that builds up in the coke drum overhead vapor line is responsible for most of the back-pressure incidents. Operators find that tearing the insulation…
Vapors from the coke drum must pressure their way through to the combination tower reflux drum. Any restriction to their flow will increase the operating…
If a refiner is to operate on a short coke drum cycle, he can expect to encounter pockets of hot coke that the drum cooling…
As soon as the cutting water pump is shutdown, the decoking crew immediately begins replacing the top and bottom heads. Both heads must be worked…
This coke-cutting procedure involves the use of a combination coke-cutting/drilling tool made by Pacific Pumps (Dresser Industries), as shown in Figure 2-12. This cutting head…
Cutting time varies with the hardness of the coke, the condition of the hydraulic cutting nozzles, and the available cutting water pressure. Of equal significance…
If the drum is not draining properly, the decoking crew should proceed as follows: Wait as long as possible without jeopardizing the cycle. Set the…
The decoking crew should begin unbolting the bottom head while the drum is still draining. Leaving every third bolt in place, the drum depressured and…
Many cokers have a removable spool piece between the bottom head of the coke drum and the resid feed line. This section of piping must…