Map Barriers With a Bowtie
Use bowtie logic to identify preventive and mitigative barriers around a hazardous event.
Map diesel unloading so barriers are not lumped together. Threats -> preventive barriers -> top event -> mitigative barriers -> consequences. The common trap is counting every control as if it prevents the event. Spill response matters, but it does not prevent overfill. Top event Define the top event as loss of containment during diesel transfer. The bowtie centers on the moment control is lost. Threats List overfill, hose rupture, wrong valve alignment, vehicle movement, and operator distraction. Threats are causes that could lead to the top event. Preventive barriers Add transfer checklist, wheel chocks, hose inspection, high-level alarm, and…
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