摘要
安全仪表系统(SIS)的安全完整性是衡量安全相关系统在规定条件下、规定时间内成功实现所要求的安全功能概率的重要指标。笔者针对1oo2D冗余结构的SIS,采用FMEA(故障模式及影响分析)方法研究系统研发各个阶段的缺陷和薄弱环节,然后结合IEC61508中推荐的诊断技术和措施改进电路。通过该方法还可获得相关参数,得到系统的平均要求失效概率PFDAVG,确定SIS的安全完整性等级是否满足要求。目前该方法已成功应用在安全级DCS平台样机研制的安全完整性分析中,结果表明该系统满足要求的SIL3等级。
Safety integrity of safety instrument system is the important indices measured the probability of safety related system successfully implement safety function required by itself under prescriptive condition and time.This paper aiming at the 1oo2 D redundant structure SIS,adopting FMEA（failure mode and effects analysis）method to study the defects and weak links of the system research and development stages,then combining the IEC61508 recommended diagnostic techniques and measures to improve circuit.By the method can also obtain related parameters,get system average probability of failure on demand-PFDAVG,determine the SIS safety integrity level whether meet the require-ment.At present the method has been successfully applied in the safety integrity analysis of safety level DCS platform prototype developing,the result shows that the system meet the requirement of SIL3 level.
出处
《机电产品开发与创新》
2016年第5期32-35,共4页
Development & Innovation of Machinery & Electrical Products
