Operating Limits Are Consequence Statements
Describe operating limits in terms of boundary, consequence, and corrective action.
A number becomes a control only when it carries its consequence. Boundary The boundary is the measurable range: temperature, pressure, pH, flow, composition, level, or differential pressure. It should match the current PSI and equipment capability, not an old habit copied from a previous product. Consequence The consequence explains why the boundary exists. That may be runaway potential, toxic release, corrosion, overpressure, fouling, contamination, or product failure. Consequence language helps the operator prioritize the alarm. Recovery Action The recovery action is the first move that restores margin. It should be specific enough to execute: pause feed, verify valve position, switch…
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