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RE: Tarball



Sounds about right, but your tarball was probly not specifically created from the coke left in the coke drums, but this is probly the root cause.  The tar ball was because you only had an hour and half feed time and couldnt get long enough time for that time/heat cracking to take place.  Because of the coke left in the drum you had to switch out of it way to early, rule of thumb we use is to try to shoot for at least 8 hours of feed time if conditions exist, if not your probly gonna get a tar ball.

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