Process puzzler: Are relief revisions reasonable?

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Chemical Processing | 2020年 / 82卷 / 12期
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We completed an engineering package for a de-ethanizer system that is part of an overall expansion of a refinery (see figure). This involved replacing some lower trays because of fouling and capacity limitations and repairing corrosion in the feed tray and tubes in the air heat exchanger and water condenser. Construction is done. However, the pressure relief system — I did its initial design a few years ago but that has been significantly modified — troubles me.
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