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…
Author: Jack
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…
Once the switch has been completed and a small flow of steam (4,000-5,000 Ib/hr for a 20-ft diameter drum) has been estabished, the vapor valve…
One of the frequent causes of extended coke drum cycles is the difficulty in filling the drum with cooling water. Once feed is switched out…