exida Recorded Webinars

Are you falling into the "Numbers Trap" in functional safety? Many practitioners mistakenly assume that meeting a PFDavg or PFH target automatically guarantees SIL compliance. However, a truly safe and compliant Safety Instrumented Function (SIF) requires much more than just a passing mathematical probability.

In this webinar, Steve Gandy breaks down the three mandatory performance criteria mandated by IEC 61511 and IEC 61508. He explores why the SIL achieved is only as strong as its weakest link, and how ignoring structural rules can lead to over-designed capital expenses or dangerous, hidden operational risks. Learn how to move beyond simple calculations toward a holistic, compliant, and defensible safety lifecycle!

Key Discussion Points

• The Three Barriers: A deep dive into the mandatory criteria for true compliance: Probabilistic Performance (PFDavg/PFH), Minimum Architectural Constraints (HFT), and Systematic Capability.
• Hardware Fault Tolerance (HFT): Navigating the complexities of Route 1H vs. Route 2H, and understanding how equipment selection directly impacts your redundancy requirements.
• The SIDA Requirements: How to ensure your SIF functions as a truly Independent Protection Layer by making it Specific, Independent, Dependable, and Auditable.
• Use of Realistic Failure Data: Crucial insights on how to verify that the failure rate data you are using in your calculations is both credible and realistic.
• Avoiding the Pitfalls: How to prevent costly nuisance trips and operational burdens through correct, comprehensive SIL Verification.