ISA-TR84。00.02-2015为资料性文件，不包含任何强制性条款。ISA-TR84。00.02供全面了解ISA-84.00.01-2004第1部分的人员使用。本文件假设需要SIS。它没有提供用于确定SIS需求的危害和风险评估指南。用户可参考ISA-84.00.01-2004第3部分，以及CCPS的危险评估程序和保护层分析:简化风险评估，以获得SIL分配指南。在继续使用ISA-TR84之前。00.02-2015，应完成危害和风险评估以及保护层的安全功能分配，并提供以下信息: 根据SIFISA-TR84的功能要求和完整性要求，至少需要一个SIF。00.02-2015就影响SIL验证的不同问题提供了指导:评估随机和系统故障，分类故障模式，以及估计SIF单个设备的故障率；评估诊断和机械完整性选择对SIF及其设备性能的影响；评估和估计共因和共模故障的可能性；以及验证SIF是否达到规定的SIL和假跳闸率。ISA-TR84。00.02提供了评估以下各项的技术指南: 低需求模式误跳闸率的平均故障概率在ISA-TR84的下一次修订之前，有四个主题被搁置。00.02. 在此之前，读者应参考ISO 12489以了解适当的方法。连续和高需求模式系统的建模独立验证试验有效性，以及如何通过设计和机械完整性实践解决这一问题理解如何对子系统和系统故障以及危险事件发生的共同原因和系统贡献进行建模扩展对共同原因和系统错误的讨论，以解决这些问题贯穿整个生命周期

ISA-TR84.00.02-2015 is informative and does not contain any mandatory clauses. ISA-TR84.00.02 is intended for use by those with a thorough understanding of ISA-84.00.01-2004 Part 1. This document assumes that a SIS is required. It does not provide guidance on the hazard and risk assessment used to identify the need for a SIS. The user is referred to ISA-84.00.01-2004 Part 3, and CCPS's Hazard Evaluation Procedures and Layers of Protection Analysis: Simplified Risk Assessment for guidance on assigning the SIL.Prior to proceeding with use of ISA-TR84.00.02-2015, the hazards and risk assessment and the allocation of safety functions to protection layers should be completed and the following information provided:At least one SIF is requiredThe functional requirements of the SIFThe integrity requirements of the SIFISA-TR84.00.02-2015 provides guidance on different issues that impact SIL verification:Assessing random and systematic failures, classifying failure modes, and estimating the failure rates for individual devices of an SIF;Assessing the impact of diagnostic and mechanical integrity choices on the performance of the SIF and its devices;Assessing and estimating the potential for common cause and common mode failures; andVerifying that the SIF achieves a specified SIL and spurious trip rate.ISA-TR84.00.02 provides guidance on techniques for evaluating the following:Average probability of failure on demand for low demand modeSpurious trip rateThere are four topics that are being held until the next revision of ISA-TR84.00.02. Until then, the reader should refer to ISO 12489 for appropriate methodologies.Modeling of continuous and high demand mode systemsUnderstanding proof test effectiveness and how this is addressed by design and mechanical integrity practicesUnderstanding how to model common cause and systematic contribution to the failure of subsystems and systems and to the occurrence of the hazardous eventExpanding the discussion of common cause and systematic error to address these issues across the entire lifecycle