How Much Is Enough: IEC 61511 Part II, Hazard and Risk Assessment, SIL Determination, Risk Graphs, LOPA by Ear and SIL 3 Creep

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 1h 3m

Day one of the SIL workshop for Train 4, and the very first scenario comes out at SIL 3. Hamad Al Mazrouei, who has facilitated more of these than he can count, doesn't believe it. With Diego Ferrer he walks through the arithmetic of tolerable risk, the risk graph and the layer of protection analysis, tests every claimed layer for independence, and then asks the question every SIL workshop should ask before it accepts a SIL 3: can we design the hazard out instead?

Chapters

00:00:00 Cold open: the first scenario comes out SIL 3

00:03:00 From hazard to required risk reduction

00:08:33 A short…