Functional Safety: Practical examples of safety loops acc. to IEC 61508

Five different examples of safety loops from process engineering are presented in detail. Starting with the functional description and the risk analysis, the entire calculation and selection of the proof test interval is shown in detail.

Key Takeaways:

• Improved understanding of all steps from risk analysis to calculation results.
• How can diagnostic coverage (DC) help to improve safety loops?
• How to deal with aggravated process conditions in safety loops?
• How to interpret PFD calculations in relation to proof test intervals?