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Permissive Sequencing and ISA 84 -- The Shape of Things to Come

机译：允许排序和ISA 84-即将发生的事情

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Although most facilities embrace ANSI/ISA 84.00.01-2004 (IEC 61511) and the Safety Life Cycle (SLC) as the way to comply with regulatory requirements (Like OSHA 1910.119), there are specific instances when most operations deviate from the standard. These are during start-up, shut-downs and process transitions. Processes with adequately designed Safety Instrumented Functions (SIF) that are validated to well developed Safety Requirement Specifications (SRS) are commonly (although momentarily) idled, and instead are practically replaced by a team of operators, managers and specialized personnel. Bypassing, inhibiting or masking is a common practice during these plant conditions. In these cases, the Safety Instrumented System (SIS) is temporarily replaced by humans in calculated and intensely watched conditions.rnThis paper questions the need for this practice and confronts the practical limitations that lead to it. It examines the assumptions used to justify the suspension of certain SIFs and uses Burner Management Standards and typical process SIS, as an example of how to automate the permissive sequencing required for these process change of states.rnFinally, the paper examines how a cause and effect tool could be used to simplify the development and implementation of automated permissive sequences including verification and validation as required in the standard.
机译：尽管大多数设施都将ANSI / ISA 84.00.01-2004（IEC 61511）和安全生命周期（SLC）作为遵守法规要求的方式（例如OSHA 1910.119），但是在某些情况下，大多数操作会偏离标准。这些是在启动，关闭和过程转换期间进行的。具有经过适当设计的安全仪表功能（SIF）且已通过完善的安全需求规范（SRS）验证的过程通常（尽管暂时）处于闲置状态，实际上由一组操作员，经理和专业人员代替。在这些植物条件下，绕过，抑制或掩盖是一种常见的做法。在这些情况下，安全仪表系统（SIS）会在经过精心计算和密切关注的条件下被人类暂时取代。本文对这种做法的必要性提出了质疑，并面临导致这种做法的实际限制。它检查了用于证明某些SIF暂停的合理性的假设，并使用了Burner管理标准和典型的过程SIS，作为如何自动执行这些过程状态改变所需的许可序列的示例。最后，本文研究了因果关系该工具可用于简化自动许可序列的开发和实施，包括标准中要求的验证和确认。

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