当前位置: X-MOL 学术Process Saf. Prog. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
SIL-3, SIL-2, and unicorns (there is a high probability your SIL 2 and SIL 3 SIFs have no better performance than SIL 1)
Process Safety Progress ( IF 1 ) Pub Date : 2021-11-08 , DOI: 10.1002/prs.12314
Arthur M. (Art) Dowell 1 , William Bridges 2 , Hal W. (Hal) Thomas 3 , Matias Massello 4
Affiliation  

Safety instrumented system (SIS) standards improved the definition of interlocks and introduced requirements for improved management systems to enforce independence from other independent protection layers (IPLs). SIS standards require verification that the performance of each safety instrumented function (SIF) will be met during its lifetime, where the performance criterion is documented as the target safety integrity level (SIL) or risk reduction factor for the SIF. The SIL is in turn tied to specific values of probability of failure on demand (PFD). The current SIS standards and the TR (Technical Reports, from ISA) that explain how to do SIL verification calculations do not include accounting for specific human error probabilities—this is a major deficiency as even the probability of a single human error can be much larger than the target PFD of 0.001 for a SIL 3 and oftentimes a little larger than the PFD of 0.01 for a SIL 2. The SIL verification methods outlined in the standards and technical reports like ANSI/ISA TR84.00.02 facilitate consistency for the component-only failure rates. As user companies seek to obtain greater risk reduction from their SIS to satisfy their corporate risk criteria, failure to adequately address potential specific human failures can lead to overly optimistic results and a misallocation of resources intended to reduce risk.

中文翻译:

SIL-3、SIL-2 和独角兽(SIL 2 和 SIL 3 SIF 的性能很可能不比 SIL 1 更好)

安全仪表系统 (SIS) 标准改进了联锁的定义,并引入了对改进管理系统的要求,以强制独立于其他独立保护层 (IPL)。SIS 标准要求验证每个安全仪表功能 (SIF) 的性能将在其生命周期内得到满足,其中性能标准记录为 SIF 的目标安全完整性等级 (SIL) 或风险降低系数。SIL 又与按需失效概率 (PFD) 的特定值相关联。当前的 SIS 标准和 TR(技术报告,来自 ISA)解释如何进行 SIL 验证计算的说明不包括考虑特定的人为错误概率——这是一个主要缺陷,因为即使是单个人为错误的概率也可能远大于 SIL 3 的目标 PFD 0.001 和通常比 SIL 2 的 PFD 0.01 稍大。标准和技术报告(如 ANSI/ISA TR84.00.02)中概述的 SIL 验证方法有助于实现仅组件故障率的一致性。当用户公司寻求从其 SIS 中获得更大的风险降低以满足其公司风险标准时,未能充分解决潜在的特定人为失误可能导致过于乐观的结果和旨在降低风险的资源分配不当。标准和技术报告(如 ANSI/ISA TR84.00.02)中概述的 SIL 验证方法有助于实现仅组件故障率的一致性。当用户公司寻求从其 SIS 中获得更大的风险降低以满足其公司风险标准时,未能充分解决潜在的特定人为失误可能导致过于乐观的结果和旨在降低风险的资源分配不当。标准和技术报告(如 ANSI/ISA TR84.00.02)中概述的 SIL 验证方法有助于实现仅组件故障率的一致性。当用户公司寻求从其 SIS 中获得更大的风险降低以满足其公司风险标准时,未能充分解决潜在的特定人为失误可能导致过于乐观的结果和旨在降低风险的资源分配不当。
更新日期:2021-11-08
down
wechat
bug