Reliability, Modelling and Calculation of Safety Systems

Synthesis

Day 1 :- A. INTRODUCTION AND BACKGROUND
Why and when?
Typical safety systems & mode of operation (on demand or continuous modes)
– B. RELEVANT CORE CONCEPTS FOR SAFETY SYSTEMS
Basic probabilistic measures (reliability, availability, failure frequency)
– C. CHALLENGES AND DIFFICULTIES OVERVIEW
Slides & exercises

Day 2 :
– D. NOTION OF SAFETY INSTRUMENTED SYSTEM
– E. FUNCTIONAL SAFETY APPROACHES
Functional safety standards (IEC 6158, IEC61511, ISO/TR 12489)
Overview of the functional safety approach (risk reduction)
Basic functional safety concepts (SIL, PFDavg, PFH) & comparison with conventional safety concepts
– F. APPROACHES OVERVIEW
Slides & exercises

Day 3 :
– G. SIMPLIFIED FORMULA APPROACH
Principles
Example of establishing and using formulae
Limitations
– H. RELIABILITY BLOCK DIAGRAMS (RBDS), FAULT TREES (FTS) AND MARKOVIAN APPROACHES
Principle of RBDs, FTs and Markovian approaches
RBD and FT driven Markov models
Example of using RBDs and fault trees handling on actual safety instrumented systems. Limitations
Slides & exercises

Day 4 :
– I. PETRI NETS MODELING (PNM) AND MONTE CARLO Simulation (MCS)
Introduction to PNM and MCS
RBD driven PN
Example of using PNM and MCS on actual safety instrumented systems. Limitations
– J. COMMON CAUSE MODELLING
– K. RELIABILITY DATA
Need for reliability data
Reliability data collection & reliability data bases
Slides & exercises

Day 5 :
– L. CONCLUSION
– M. REVISION
Slides & exercises
– N. Control (QCM): optional

Language

Français & Anglais

Audience type

Students from university and engineering schools; Engineers dealing with safety; Teachers interested in probabilistic calculations applied to actual industrial safety systems.

Planned duration

5 days, 4 to 5 hours per day different timing and/or student levels.

Support material

Paper copy of Slides and exercises. Slides in English or French Notes: the content of the course/exercises can be tuned according to the student level. This program can be lightened according to the University planning

Prerequisite

Objectives

General reliability concepts relevant for safety systems (including safety instrumented systems, SIS): reliability, availability (PFD), failure frequency (PFH), SIL, etc. Challenges and solutions to model and calculate the probabilistic measures: simplified formulae, reliability block diagrams, fault trees, Petri nets and Monte.

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