“A chemical-release bowtie: the hazard is corrosive chemical stored in a tank and the top event is loss of containment. Show corrosion, transfer overfill and hose failure as threats, with compatibility, inspection, alarms, shutdown, hose checks and dry-break couplings as barriers. Show worker exposure, environmental release and plant shutdown with eyewash, medical response, containment, spill response, isolation and recovery barriers.”
Comprenez les décisions qui le sous-tendent.
Name the stored material and system.
Use loss of containment.
Cover integrity and transfer controls.
Include people and environmental consequences.
Use for a qualitative process-safety workshop before detailed engineering review.
Questions fréquentes
What is loss of containment?
It is the unintended release of a contained chemical from its intended system.
What are preventative barriers?
They are controls intended to stop a threat from causing the top event.
Can assurance activities be shown?
Yes. Inspection and testing can be added as barriers or as controls against barrier degradation.