SIL Determination & Verification: LOPA, PFDavg & CHAZOP

▸ A safety instrumented system has to work on demand — sometimes after sitting dormant for years.

The engineer who can run a LOPA, write a safety requirements specification, and defend a PFDavg calculation to an assessor is the one who protects both the plant and the people working on it.

This course is about producing those deliverables, not describing them.

▸ What makes this course different

Plenty of material explains the IEC 61511 lifecycle. This course teaches the practitioner work inside it — the LOPA you actually have to facilitate, the SRS you actually have to write, and the PFDavg calculation you actually have to defend. Every method is worked by hand, so you understand what the verification software is doing rather than trusting its output.

▸ CHAZOP — the study almost nobody teaches

A full lecture covers control system hazard and operability study: what it examines, how it differs from a process HAZOP, and how it identifies the control and instrumentation failures a conventional study misses. Increasingly expected on major hazard installations, and very difficult to find training on anywhere.

▸ What you will master

• LOPA and SIL determination — initiating events, independent protection layers, the risk gap and the required SIL

• HAZOP and CHAZOP — process hazard identification and control system hazard and operability study

• The safety requirements specification — the document where most SIS projects succeed or fail, and the contract between the hazard study and the design

• SIS architecture — voting arrangements, redundancy, hardware fault tolerance, safe failure fraction and architectural constraints

• SIL verification by hand — calculating PFDavg against the target SIL, and knowing when an architecture cannot get there

• Component selection — sensors, logic solvers and final elements, and the certification evidence behind each

• Operation and proof testing — test intervals, procedures and bypass management, where a SIS either stays trustworthy or quietly degrades

• Functional safety assessment — scoping an FSA across lifecycle phases and closing out

▸ A worked end-to-end example

The course includes a complete worked SIF design — taking a hazard through LOPA to a target SIL, into an architecture, and out to a verified PFDavg. That is the sequence you will be asked to produce on a real project.

▸ What you get

• 13 focused lectures across six sections

• A complete worked SIF design from hazard through to verification

• Lifetime access, mobile and TV access, and a certificate of completion

• Udemy's 30-day money-back guarantee

▸ Who this is for

C&I, control and safety engineers who specify, design or verify safety instrumented systems. Functional safety practitioners conducting SIL determination and verification. Process and mechanical engineers participating in LOPA or reviewing an SRS. Commissioning and maintenance staff responsible for proof testing and bypass management. And system integrators designing SIS logic solvers and final elements.

▸ No prior functional safety experience is required — the lifecycle and terminology are built from the ground up. No SIL verification software needed: every calculation is worked by hand so you can follow with a calculator.

Built by a practising engineer with over fifteen years delivering SIS and functional safety on oil, gas and energy projects — including SIL determinations, safety requirements specifications, verification calculations and functional safety assessments on active major hazard installations.