It was a simple matter to look at the entire panel board, and discern whether any section of the plant was running poorly. So instrumentation indicating operating units with the plant was grouped together for recognition sake and ease of problem solution. (For instance, green lights meant OK, Yellow meant not OK, and Red meant BAD.) Panel boards were usually laid out in a manner that replicated the process flow in the plant.
Additionally, Emergency Shut Down (ESD) systems were employed to halt a process that was in danger of exceeding either safety, environmental or monetarily acceptable process limits.Īlarm were indicated to the operator by annunciator horns, and lights of different colours. They include situations that have a necessary or possible operator response to ensure:Īlarms were added to alert the operator to a condition that was about to exceed a design limit, or had already exceeded a design limit.
The purpose of alarm management system is to alert the operator to relevant abnormal operating situations.
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