Process Puzzler: See the Light After a Brownout

Trips of a column and compressor call for considerable changes

1509 puzzler mn

This Month’s Puzzler: Our de-ethanizer stripper tripped after we attempted to start up the tower after a power failure that almost exclusively affected the refinery gas unit (see figure) — and we’re still trying to restart it. The fluid catalytic cracker and still suffered a ½-sec brownout but everything restarted without trouble. The rest of the refinery may not have been affected. The de-ethanizer trip occurred within a few minutes after we ran into an unexpected compressor trip when restarting the oil absorber upstream of the de-ethanizer. Within seconds after that compressor trip, the topside de-ethanizer high-pressure alarm activated and the top relief valve…

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    This Month’s Puzzler: Our de-ethanizer stripper tripped after we attempted to start up the tower after a power failure that almost exclusively affected the refinery gas unit (see figure) — and we’re still trying to restart it. The fluid catalytic cracker and still suffered a ½-sec brownout…

    Full Story
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