首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.3; 20070514-17; Montreal(CA) >SAFETY LOOPS IDENTIFICATION AND TARGETING METHOD COMPLIANT WITH IEC61511 REQUIREMENTS
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SAFETY LOOPS IDENTIFICATION AND TARGETING METHOD COMPLIANT WITH IEC61511 REQUIREMENTS

机译:符合IEC61511要求的安全环标识和定位方法

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Safety Instrumented Systems are used in gas turbine (GT) systems design to mitigate potential hazardous situations that can arise from process deviations. International standard IEC61511, (released in 2003) sets out an approach for establishing the relative safety integrity of a safety-instrumented system to perform its prescribed action over the product life cycle (design, installation, and operation of safety instrumented systems). This unified approach is currently being adopted as an industry standard (e.g. UK HSE Guidance Note PM84 and ISO DIS 21789 dedicated to Gas Turbine Safety). Using this approach, each Safety Instrumented Function (SIF) must be evaluated to determine the level of risk reduction required for safe operation of the plant. Properly targeting the necessary level of risk reduction is critical. Underestimating the target risk reduction level can result in exceeding the plant tolerable risk threshold. Over-estimating the target risk reduction level can result in increased life cycle cost of the system design. This paper describes a scientific-numeric approach for targeting the safety integrity requirements that comply with IEC 61511. An Accident Scenario Review (ASR) for each major hazard identified is used to identify the SIF and associated maximum probability of failure on demand (for demand mode) or maximum probability of dangerous failure per hour (for continuous mode). This method can be used for systems previously designed or in operation. The process integrates field experience to validate and justify model assumptions.
机译:安全仪表系统用于燃气轮机(GT)系统设计中,以减轻过程偏差可能引起的潜在危险情况。国际标准IEC61511(于2003年发布)提出了一种建立安全仪表系统的相对安全完整性的方法,以在产品生命周期(安全仪表系统的设计,安装和运行)中执行其规定的动作。目前,这种统一方法已被用作行业标准(例如,英国HSE指南PM84和专门针对燃气轮机安全性的ISO DIS 21789)。使用这种方法,必须对每个安全仪表功能(SIF)进行评估,以确定降低工厂安全运行所需的风险等级。正确确定必要的风险降低水平至关重要。低估目标风险降低水平可能会导致超出工厂可承受的风险阈值。高估目标风险降低水平可能会导致系统设计的生命周期成本增加。本文介绍了一种科学数字方法,用于针对符合IEC 61511的安全完整性要求。针对识别出的每种主要危害,均进行了一次事故情景审查(ASR),以识别SIF以及相关的按需失效的最大概率(针对需求模式) )或每小时发生危险故障的最大概率(对于连续模式)。此方法可用于先前设计或正在运行的系统。该过程整合了现场经验,以验证和证明模型假设。

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