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PRODUCT SPOTLIGHT: Practical SIL Target Selection - Risk Analysis per the IEC 61511 Safety Lifecycle

| Functional Safety

Each month at exida, we strive to spotlight one of our products that makes the job easier for today's industry professional. In this blog, I wanted to talk about the exida publication  Practical SIL Target Selection - Risk Analysis per the IEC 61511 Safety Lifecycle which is based on numerous courses, seminars, and safety engineering projects exida has completed throughout the world. This is a must read book for Process Safety Engineers, SIL Determination/Selection Engineers, PHA & LOPA facilitators. 

The first phase of the safety Lifecycle is the Analysis phase. During this phase, users are expected to identify hazards, analyze the risks associated with those hazards, and compare the determined levels of process risk with tolerable levels. If the process risk is larger than the tolerable risk, risk reduction must be implemented. Determining the amount of required risk reduction is referred to as SIL Target Selection.

Risk analysis per the IEC 61511 Safety Lifecycle revolves around establishing target SIL levels for Safety Instrumented Functions. The Practical SIL Target Selection - Risk Analysis per the IEC 61511 Safety Lifecycle book describes aspects of risk management and establishing a level of tolerable risk. The book describes concepts of consequence analysis and likelihood analysis including qualitative and quantitative Layer of Protection Analysis (LOPA). Consequence and Likelihood together define (process) risk. It also describes methods to determine required risk reduction through methods like risk matrix, risk graph, and frequency based target options.

Highlights of the book also includes:

  • Expands upon framework developed in functional safety standards
  • Provides a working guide to apply SIL Target Selection concepts and techniques
  • Applies to both retrofit and green field projects in the process and machine automation industries.

Tagged as:     SIL level     Safety Lifecycle     Safety Instrumented Function     risk matrix     Product Spotlight     LOPA     Layer of Protection Analysis     Iwan van Beurden     IEC 61511  


Iwan van Beurden is the Chief Technology Officer and Director of Product Development at exida. He supports exida’s end-user services, manufacturer services, and certification activities and has over 20 years of professional experience in the Functional Safety field. Iwan is responsible for the development, maintenance, and certification of the exSILentia® software and associated products. Iwan is an exida and ISA instructor. Iwan is a Certified Functional Safety Expert and holds a Master of Science degree from Eindhoven University of Technology in Eindhoven, the Netherlands, where he majored in reliability engineering and graduated cum laude.

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