基于MBF参数模型的安全完整性等级定量评估

Quantitative Assessment of Safety Integrity Levels Based on MBF Model

介绍了安全完整性等级验证的相关内容,并对系统发生危险失效因素进行分析;在引入MBF(Multiple Beta Factor)参数模型的基础上,定量计算系统发生共因失效的概率,并研究系统发生独立危险失效的概率及其影响;最后给出应用实例进行验证。结果表明:本文方法不仅更接近工业生产中安全仪表系统冗余结构的实际情况,也大大简化了计算,弥补了马尔可夫模型法分析计算过程复杂的缺陷。

This paper introduces the safety integrity level verification and analyzes the dangerous failure factors of the considered system. By using MBF parameter model, this paper quantitatively calculates the probability of common cause failure of the system. Moreover, the impact of independent failure probability for the safety instrument system is analyzed. Finally, the application example shows that the proposed method is not only closer to the actual redundant structure of safety instrument system in the industrial production, but also greatly simplifies the calculation and deals with the shortcoming of Markov model with complicated calculating procedure.