Advanced
Advanced functional safety topics address the complex engineering challenges encountered in high-integrity SIS design, verification, and lifecycle management. This collection explores sophisticated applications of IEC 61508 and IEC 61511, including detailed architectural considerations for redundant voting systems, advanced diagnostic coverage optimization, and quantitative risk assessment methodologies beyond basic SIL determination.
Process Hazard Analysis (PHA): One Term, Many Meanings
Process hazard analysis is one of the most searched terms in process safety, and one of the loosest. What a…
The Haldia Naphtha Pipeline Fire: What We Know So Far
In June 2026, a naphtha pipeline caught fire at Haldia Petrochemicals in West Bengal, India, burning outward into homes, a…
The Longview Chemical Tank Implosion: What We Know So Far
On May 26, 2026, a 900,000-gallon white liquor tank imploded at the Nippon Dynawave mill in Longview, Washington, killing eleven…
The Garden Grove Chemical Incident: What We Know So Far
A tank of methyl methacrylate at a GKN Aerospace facility in Garden Grove, California has been the center of a…
SIL Verification: The Three Gates Every SIF Must Clear
SIL verification under IEC 61511 is three independent gates, all of which must pass: PFDavg, systematic capability, and architectural constraints.…Hazard and Risk Analysis Methods: How HAZOP, What-If, LOPA, Risk Graph, FTA, ETA, and Bowtie Fit Together
A practitioner's orientation to the methods that make up an IEC 61511 hazard and risk assessment — HAZOP, What-If, LOPA,…How MTTR Affects Your SIL Calculations: A Beginner’s Guide to Mean Time to Restore
Learn how MTTR (Mean Time to Restore) fits into PFDavg and STR in IEC 61511 compliance. A clear, beginner-friendly guide…
