安全完整性等级(SIL)评估技术探讨

Discussion on the Evaluation Technique of Safety Integration Level(SIL)

安全完整性等级(SIL)评估技术是近几年发展起来的针对化工行业的一种基于风险的资产管理方法,国际标准IEC 61508和IEC 61511的制定为石化工业等过程工业的安全完整性等级评估提供了依据,对石化行业的安全生产水平具有重要的促进作用。简要介绍了保护层及安全仪表系统(SIS)的概念,重点介绍了安全完整性等级(SIL)的概念、分类、评估内容和时机,分别对SIL定级和SIL验证作了解释,为项目SIL评估工作提供理论依据。

The evaluation technique of Safety Integration Level（SIL）is a risk-based asset management method,which has been developed in chemical industry in recent years.The formulation of international standard IEC61508 and IEC61511 provides basis for the evaluation of safety integration level of process industry,such as petrochemical industry and greatly promotes the safe production level.With brief introduction on the concept of protection layer and safety instrument system（SIS）,this paper focuses on the concept,classification,evaluation content and timing of Safety Integrity Level（SIL）with explanation on SIL grading and SIL verification,which provides theoretical basis for the project SIL evaluation.