Overview
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Olivier IDDIR: Project Engineer, Expertise and Modeling Department, QHSES Division, Technip
INTRODUCTION
Assessing the SIL level of safety instrumented functions (SIF) is an essential step in the design of Safety Instrumented Systems (SIS). The IEC 61508 and IEC 61511 standards now constitute a normative frame of reference that can be used not only during the design phase, but also throughout the life cycle of a SIS. In order to use these standards wisely, and to correctly estimate the SIL level, it is necessary to master essential concepts such as :
What's the difference between SIS and SIF?
What is the SIL level?
What is the link between probability of failure and SIL level?
What lies behind the notion of redundancy?
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SIL level assessment of Safety Instrumented Functions (SIF) – Essential concepts
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