摘要
安全完整性等级(SIL)是安全仪表系统(SIS)的核心,围绕衡量SIL的4项指标:失效概率要求、硬件结构约束要求、系统失效避免及控制要求、软件要求,对照IEC 61508—2010中相关要求对构成安全仪表回路的硬件结构约束要求、系统失效避免及控制要求等展开了讨论,一般安全仪表回路的硬件结构是否满足相应的SIL等级要求,应由整个回路各组成部分中最低的SIL等级决定;冗余可提升冗余部分的SIL等级。就设计中如何满足系统失效避免及控制的要求给出了合理化建议。
Safety integrity level （SIL） is the core of safety instrumentation system （SIS）. Focusing on the four indicators of SIL. requirements of probability of failures, hardware architectural constraints, requirements of system failure avoidance and control and software requirements. In accordance with the requirements in IEC 61508- 2010, constitution of hardware architectural constraints, system failure avoidance and control requirements are discussed. Whether hardware structure of the ordinary safety instrument loop meeting the corresponding SIL level requirements should be determined by the minimum SIL of the component in the entire loop. Redundancy can increase the SIL level of the redundant part. Rationalization proposal on how to meet system failure avoidance and control requirement in design is also given.
作者
田京山
王长楠
王贵波
Tian Jingshan Wang Changnan Wang Guibo(Sinopec Petroleum Engineering Corporation, Instrumentation and Communication Department, Dongying, 257026, China SinopecChina Petroleum ~ Chemical Corporation Beijing Oil Products Company, Beijing, 100022, China Sinopec Zhongyuan Oilfield Company Puguang Gas Field, Dazhou, 636156, China)
出处
《石油化工自动化》
CAS
2017年第5期11-14,共4页
Automation in Petro-chemical Industry
关键词
安全仪表系统
安全完整性等级
安全仪表功能
硬件结构约束
安全失效分数
safety instrumented system
safety integrity level
safety instrumented function
hardware architectural constraints
safety failure fraction
