IEC TR 63161:2022 安全完整性要求的分配-基本原理

标准编号：IEC TR 63161:2022

中文名称：安全完整性要求的分配-基本原理

英文名称：Assignment of a safety integrity requirements - Basic rationale

发布日期：2022-07-13

标准范围

IEC TR 63161:2022可用于根据ISO 12100对机器或加工厂进行风险评估，并且已选择安全相关控制功能作为针对特定危害的保护措施来实施。本文档描述了为所选功能分配安全完整性要求的示例基本逻辑原理。该描述是通用的，并且尽可能合理地独立于可用于分配安全完整性要求的任何特定工具或方法。需求可以表示为安全完整性级别（SIL）或性能级别（PL）。描述了由这种方法和工具体现的示例性基本原理，只要它们遵循基于风险的定量方法。相反，本文档中描述的逻辑可以用作评估安全性完整性分配的特定方法或工具的参考。这可以澄清相应的工具/方法在多大程度上遵循了基于风险的定量方法，以及其他考虑因素导致了与该方法的偏差。在实际应用中，基于定量风险的方法在许多情况下可以被其他考虑因素修改或覆盖，这是有充分理由的。讨论或评估此类原因不在本文件的范围内。通常会提供偏离定量逻辑的给定工具或方法的原因，以便可以在适当的框架中讨论。以风险图和风险矩阵的形式为常见的分配工具提供了此类分析的示例。本文件可用于所有应用模式下的安全相关控制功能:应用的连续模式、高需求模式和低需求模式。

IEC TR 63161:2022 can be used where a risk assessment according to ISO 12100 has been conducted for a machine or process plant and where a safety related control function has been selected for implementation as a protective measure against specified hazards. This document describes an example basic logical rationale to assign a safety integrity requirement to the selected function.
The description is generic and as far as reasonably possible independent from any specific tool or method that can be used for assignment of a safety integrity requirement. The requirement can be expressed as a safety integrity level (SIL), or performance level (PL).
An example basic rationale is described that is embodied by such methods and tools, as far as they follow a risk based quantitative approach.
Conversely, the logic described in this document can be used as a reference for assessing specific methods or tools for safety integrity assignment. This can clarify how far the respective tool/method is following a risk based quantitative approach, and where deviations from that approach are imposed by other considerations. In real applications, the quantitative risk based approach can be modified or overridden by other considerations in many cases and for good reasons. It is not within the scope of this document to discuss or evaluate such reasons. Usually the reasons for deviations from a given tool or method from a quantitative logic are provided, so that this can be discussed in the proper frame.
Examples for such analyses are provided for common assignment tools in the format of risk graphs and risk matrices.
This document can be used for safety related control functions in all modes of application: continuous mode, high demand mode and low demand mode of application.

标准预览图