S1730103 プラントアラームマネジメントのためのBPMアプローチ([S173]産業・化学機械や設備の国際化対応技術,産業・化学機械と安全部門)

Abstract

A plant alarm system is one of important elements in a third layer of an independent protection layers (IPLs). Management of the plant alarm system has become identified as one of key issues because of disasters caused by alarm floods. The Instrumentation, Systems and Automation Society (ISA) has proposed an alarm management standard. And some methods of alarm limits setting or nuisance alarms reduction obtained through each plant improvement activities have been proposed. But, explicit definition of a plant alarm system design process to properly manage the plant alarm system has not been proposed. Plant alarm systems are not always designed using whole information about their plants, because a concreteness and quantity of information is varied along with stages of their plant design. Requirements for each safety instrumented system may not be satisfied if the design of the plant alarm system was started after all stages of the plant design had been completed. The stages of the plant alarm system design should be carried out concurrently with the stages of the plant design. Therefore, the design process of the plant alarm system should be clarified corresponding to available information at each stage of the design. To clarify the design process of the plant alarm system, a framework is necessary to express design activities with tools, available information and output. So, a business process model (BPM) as the framework for the plant alarm system design will be developed. In this paper, we tried to express a BPM for the design of a plant alarm system. Even if the developed BPM is incomplete, the BPM approach has following merits; design rationale for the plant alarm system can be specified and stored, and the plant alarm system can be designed logically. The stored design rationale and the logically designed plant alarm system are very useful for management of change of the plant alarm system and ensuring consistency with other safety instruments. In future work, a BPM for a plant alarm system design will be improved to properly manage the plant alarm system throughout the plant lifecycle.