| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 97 === In order to mitigate the undesirable effects caused by accidents in chemical plants, it is a common practice to install protective systems on processing units operated under hazardous conditions. Since the failures of sensors and valves are basically random events, the reliability (or availability) of the protective system is highly dependent upon the structural characteristics and also the maintenance policies of alarm and shutdown systems. The aim of this study is to improve the current practice in designing and maintaining protective systems (Liang and Chang, 2008). In particular, the corrective maintenance policy for the sensors is extended to allow common spares and, also, the design options of multi-channel alarms are incorporated in an integrated mathematical model to minimize the total expected expenditure. By solving this model, the optimal configurations of sensors and shutdown units, the best corrective and preventive maintenance policies and alarm/shutdown logics could be identified. Three examples are provided in this thesis to demonstrate the feasibility and effectiveness of the proposed approach.
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