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 water has not had time to quench. During the coke-cutting portion of the decoking cycle, hot coke is a very real hazard. A jet of cutting water hitting 700°F coke will cause a mini-eruption of fist-size coke from the top head. To prevent injury to personnel, a heavy-duty screen should be bolted across the top head. A 1 -ft diameter opening in the center of the screen is sufficient to allow for horizontal displacement of the stem. For further personnel protection, a shatterproof, transparent shield should be placed between the cutting stem controls and the top head.
Categories: Process Troubleshooting | Tags: hot coke | Leave a comment