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Probabilistic assessments in relationship with safety integrity levels by using Fault Trees 总被引:1,自引:0,他引:1
In this article, we study the assessment of safety integrity levels of safety-instrumented system by means of Fault Trees. We focus on functions with a low demand rate. For these functions, the appropriate measure of performance is the so-called probability of failure on demand (PFD) or probability of not functioning on demand. In order to calculate accurately the average PFD as per IEC 61508 standard, we introduce distributions for periodically tested components into Fault Tree models. We point out the specific problems raised by the assessment of safety integrity levels (SILs), which restrict the use of the formulae proposed in the standard. Among these problems there is the fact that SIL should be assessed by considering the time-dependent behavior of the system unavailability in addition to its average value. We check, on a simple pressure protection system, the results obtained by means of the Fault Tree approach against those obtained by means of stochastic Petri nets with predicates. 相似文献
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为满足石油天然气工程对重要工艺设施进行局部超临界压力保护的需要,采用了安全完整性等级很高的HIPPS技术进行系统保护.HIPPS将工艺安全保护方法由传统的被动泄放转变为主动防御,从源头消除危险,降低了工程总体投资.基于IEC 61511和IEC 61508的安全原则,考虑HIPPS作为一种特殊的安全保护技术,提出了一种特殊的自动安全保护系统方案,具体给出了系统组成及各部分的关键技术要求.实际工程应用验证了HIPPS良好的可靠性和可用性,其将成为高危险工况下安全保护技术的发展方向. 相似文献
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对一种新型燃煤发电技术高性能动力系统(HIPPS)的能量平衡方程式和整体效率进行了研究,并通过全微分的方式分析了各个设备对整体效率的影响,描绘出各参量对HIPPS整体效率的影响曲线并对其进行了分析和讨论.从而得出在选择HIPPS系统组成时,为获得系统高效率所要考虑的因素. 相似文献
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分析了HIPPS系统的功能要求、适用条件、在海洋石油工程的应用情况及应用局限性,同时介绍了采用HYSYS软件动态模拟番禺34-1CEP平台上装有HIPPS系统的番禺35-1低压设施在超压工况下压力上升过程的方法和结果。 相似文献
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