“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.”
図の背後にある意思決定を読み解く。
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.
よくある質問
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.