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Every SIF within a SIS will have a SIL level.
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To perform its function, a SIF loop has a combination of logic solver(s), sensor(s), and final element(s). Each SIS has one or more Safety Instrumented Functions (SIF). Other common terms used are safety interlock systems, emergency shutdown systems (ESD), and safety shutdown systems (SSD). What is a Safety Instrumented System (SIS)?Ī Safety Instrumented System is designed to prevent or mitigate hazardous events by taking a process to a safe state when predetermined conditions are violated. Functional Safety is achieved when every safety function is successfully carried out and the process risk is reduced to the desired level.
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Functional Safety is a term used to describe the safety system that is dependent on the correct functioning of the logic solver, sensors, and final elements to achieve a desired risk reduction level. An emphasis on quantitative risk reduction, life-cycle considerations, and general practices make these standards different from their predecessors. Previous safety standards were generally prescriptive in nature, not performance based. Industry experts began to address functional safety and formalize an approach for reducing risk in the process plant environment through the development of standards IEC 61508, IEC 61511, and ANSI/ISA 84. Major accidents around the world, as well as the increasing use of electrical, electronic or programmable electronic systems to carry out safety functions, have raised awareness and the desire to design safety systems in such a way as to prevent dangerous failures or to control them when they arise. The concept of Functional Safety was developed in response to the growing need for improved confidence in safety systems. In order to fully understand SIL and its implications, it is important to grasp the overarching concept known as Functional Safety, and how it applies to Safety Instrumented Systems (SIS) within the process industries.įunctional Safety, as defined by IEC standard 61508, is the safety that control systems provide to an overall process or plant. However, for many end users, systems integrators, and product vendors, SIL is still a somewhat ambiguous concept that often is misinterpreted and incorrectly implemented. The global importance of SIL (Safety Integrity Levels) has grown substantially in the process industries over the years.