Abstract
Alarm systems are designed to annunciate to the operators the presence of abnormal conditions that require their intervention. However, present day alarm systems are improperly managed leading to alarm floods even during minor upsets and large number of standing and chattering alarms during normal and abnormal operations. Poor alarm system performance can have serious consequences with significant economic and safety impact. Re -engineering alarm systems require a systematic alarm rationalisation procedure that involves significant time and effort. While the costs involved in this redesign can be easily quantified, the benefits cannot be easily estimated. In this work a framework to estimate alarm system effectiveness by considering alarm system performance and operator performance is discussed. Based on this framework, a simple approach is proposed to estimate the impact of alarm system effectiveness on plant operating costs.
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