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Safety instrumented functions and safety integrity levels(SIL)

机译:安全仪表功能和安全完整性等级(SIL)

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摘要

This paper discusses two performance-based standards, ANSI/ISA S84.01 and IEC d61 508, and therequirements they place upon user companies of electrical, electronic and programmable electronicsafety related systems (E/E/PE SRS) or Safety Instrumented Systems (SIS). To comply to therequirements of the standards, a user company would have to: (a) identify the safety target level ofthe process; (b) evaluate the hazardous events that pose a risk higher than the safety target level; (c)determine the safety function(s) that must be implemented in an SIS to achieve the safety target level;(d) implement the safety functions in an SIS and evaluate its safety integrity level (SIL); (e) install, testand commission the SIS; and (t) verify that the installed SIS does in fact reduce the process risk tobelow the safety target level. Several risk analysis techniques that can be used to comply with theaforementioned requirements are discussed and a simple example is used to illustrate the use,advantages and disadvantages of the techniques. The evaluation of SIL of the SIS (probability to failto respond to a process demand) is outside the scope of this paper.
机译:本文讨论了两个基于性能的标准ANSI / ISA S84.01和IEC d61 508,并提出了对电气,电子和可编程电子安全相关系统(E / E / PE SRS)或安全仪表系统(SIS)的用户公司的要求)。为了符合标准的要求,用户公司必须:(a)确定过程的安全目标级别; (b)评估构成风险高于安全目标水平的危险事件; (c)确定在SIS中必须实现的安全功能才能达到安全目标水平;(d)在SIS中实现安全功能并评估其安全完整性等级(SIL); (e)安装,测试和调试SIS; (t)确认已安装的SIS确实确实将过程风险降低到安全目标水平以下。讨论了可用于满足上述要求的几种风险分析技术,并使用一个简单的示例来说明该技术的使用,优缺点。 SIS的SIL评估(无法响应过程需求的可能性)超出了本文的范围。

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