I.S. EN 61511-3:2017

National Foreword
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
Annex A (informative) - Risk and safety
        integrity - general guidance
Annex B (informative) - Semi-quantitative
        method - event tree analysis
Annex C (informative) - The safety layer
        matrix method
Annex D (informative) - A semi-qualitative method:
        calibrated risk graph
Annex E (informative) - A qualitative method:
        risk graph
Annex F (informative) - Layer of protection
        analysis (LOPA)
Annex G (informative) - Layer of protection analysis
        using a risk matrix
Annex H (informative) - A qualitative approach for
        risk estimation & safety integrity level
        (SIL) assignment
Annex I (informative) - Designing & calibrating a
        risk graph
Annex J (informative) - Multiple safety systems
Annex K (informative) - As low as reasonably
        practicable (ALARP) and tolerable risk
        concepts
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Gives information on: - the underlying concepts of risk, the relationship of risk to safety integrity, - the determination of tolerable risk, - a number of different methods that enable the safety integrity levels for the safety instrumented functions to be determined, - The impact of multiple safety systems on calculations determining the ability to achieve the desired risk reduction.