Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.
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A relief valve on a pressurized vessel lifted briefly during a startup transient and reseated; the operator logged it as minor and readings are normal now, but you're not certain the vessel didn't see an over-pressure event. At what point does this stop being a call you close on the floor and become one you escalate to the process-safety lead or plant manager?
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