FSOE Written Test case studies
FSOE Written Test · Put your knowledge to work in context.
The FSOE Written Test is the written examination used within the Functional Safety Engineer (FSOE) certification pathway recognised in process and machinery safety circles. It is aimed at engineers who already work with safety instrumented systems, safety functions or machine safety controls and who want their competence in IEC 61508-based functional safety practice formally assessed. The FSOE Written Test case studies are 5 cases and about 3,704 words.
1Bypass Under Commercial Pressure
At a specialty-chemicals site, the SIL 2 reactor high-temperature trip has been bypassed for 11 days under a temporary management-of-change (MOC) record while a fouled thermowell is replaced. The operations manager wants to keep producing because the campaign is worth EUR 2.4 million and the next maintenance window is six weeks away.
753 words, about 4 min2Overfill LOPA With a Shared Impulse Line
A toluene storage tank at a distribution terminal is protected against overfill by a SIL 1 safety instrumented function: a high-level switch trips the inlet valve. The LOPA team credits the BPCS level controller as an IPL (PFD 0.1), an operator response to a high-level alarm on the same transmitter (PFD 0.1), and the SIS (PFD 1E-2).
714 words, about 4 min3High-Demand Burner Management SIL Claim
A packaged industrial boiler has a burner management system (BMS) certified to SIL 2. The risk graph assigns SIL 2 to the flame-failure trip.
775 words, about 4 min41oo2 Pressure Transmitters Claiming SIL 3
A SIL 3 high-pressure shutdown function uses two pressure transmitters in a 1oo2 configuration. Each transmitter is type B, has a safe failure fraction of 85%, a dangerous undetected failure rate of 5E-7/h, and a proof-test interval of one year.
730 words, about 4 min5COTS RTOS and Legacy Library in a SIL 3 Gas Detection System
A SIL 3 gas detection and shutdown system uses a commercial off-the-shelf real-time operating system (RTOS) with ten years of field history but no functional safety certification. The application software is newly developed in C, and the compiler has no tool certification.
732 words, about 4 min