The conventional safety systems are more and more often replaced by instrumented systems named HIPS (High Integrity Protection Systems) which need to demonstrate that their SIL (Safety Integrity Level) is high according to IEC 61508 and 61511 standards. Handling these standards is not so simple. They are often misunderstood and misused and wrong calculations are frequently performed by the users. This course aim to clarify the basic definitions and concepts that they introduce and to describe the sound methods and tools developed by TOTAL to perform SIL analysis and calculations and demonstrate that the SIL requirements are satisfied.The structure is the following :
1- HIPS studies within the safety and dependability framework.
2- Definition, concepts et methodology of the IEC standards. Problems identification.
3- Links with conventional techniques for safety and dependability. Sound definitions of basic parameters: PFD (Probability of Failure on Demand) and PFH (Probability of Failure per Hour).
4- Analysis and calculation methods:
.Fault Trees,
. Markovian approach,
. Stochastic Petri Nets.
5- Examples and software demonstrations.
7- Conclusions