海上平台SIS系统功能安全评估的方法

Functional Safety Assessment Method for Safety Instrumented System on Offshore Platforms

海上油气生产平台是海洋石油开采生产的重要设施,具有工艺系统复杂、设备布置紧凑、应急救援困难等风险特征,通常配置有安全仪表系统(SIS)作为一种重要的安全保障措施。根据IEC61511等标准要求,为了保持安全仪表系统的功能正常实现,需要对安全仪表系统开展功能安全评估。文章分别介绍了保护层分析法(LOPA)和马尔科夫模型(Markovmodel)评估方法,其中LOPA用于SIL定级评估,Markov用于SIL验证评估。对海上平台典型事故场景登平台海管压力高高联锁回路展开分析,评估结果显示该回路的配置情况可以满足预定的功能安全需求。

Offshore oil and gas production platform is an important facility for offshore oil exploitation and production,which has the risk characteristics of complex process system,compact equipment layout,and difficult emergency rescue.Safety instrumented systems are often conf igured on offshore platforms due to the high risks.According to standards such as IEC61511,it is necessary to conduct a functional safety assessment of the safety instrumented system,in order to maintain the normal functioning of the safety instrumented system.The protective layer analysis(LOPA)for SIL determination and Markov model for SIL verif ication are introduced in this paper.Functional safety assessment method are applied to typical scenarios of offshore platforms,the SIF of pressure high high interlock on submarine pipeline.The evaluation results show that the conf iguration of this SIF can meet the predetermined functional safety requirements.