安全仪表系统的SIL等级和冗余要求
SIL and Redundancy Requirement of Safety Instrumented System

安全仪表系统是为防止、减少油气管道危险事件发生或保持过程安全状态，实现安全保护或安全控制的控制系统，安全完整性等级(SIL)是一种量化安全仪表系统预期或要求的安全水平的分级方式，平均失效概率是衡量安全完整性等级的重要指标，相应的安全完整性等级对应着相应的硬件故障裕度，国内常用规范对各个安全完整性等级的安全仪表系统逻辑控制器冗余做了相应要求，阿美公司的紧急停车(ESD)系统逻辑控制模块冗余设置和安全完整性等级要求明显高于国内规范要求。
Safety instrumented system is the system to prevent and reduce the occurrence of dangerous events in oil and gas pipelines or to maintain process safe status, and realize safe protection or safe control. Safety integrity level (SIL) is a classification method to quantify the expected or required safety level of safety instrumented system. The average probability of failure on demand of danger is an important index to measure the safety integrity level, and the hardware failure tolerance is determined by the safety integrity level. The domestic common specifications have made requirements on the logic controller redundancy of safety instrument system for each safety integrity level. The redundancy setting and safety integrity level requirements of logic control module of emergency shutdown (ESD) system of ARAMCO are significantly higher than the requirements of domestic specifications.