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3.3
CDOIF
Chemical and Downstream Oil
Industries Forum
CDOIF is a collaborative venture formed to agree strategic areas for
joint industry / trade union / regulator action aimed at delivering
health, safety and environmental improvements with cross-sector
benefits.
Safety critical task definition and selection
A Safety Critical Task is any task where human failure could potentially
initiate
,
prevent
,
escalate
or fail to
mitigate
a major accident with consequences that are greater than the
specified threshold for the site or company.
For example:
Initiate
– a valve is left open which leads to a loss of containment
Prevent
– An individual fails to respond to an alarm
Escalate
– Drenching system failed to operate due to poor maintenance
Mitigate
– An individual fails to activate the emergency plan for the site or process
unit
When determining the failures that could occur, the following are all of relevance:
•
Inaction, the task was not completed
•
Action (either a physical or mental action), the task was not completed correctly
•
Time, the task was completed at the wrong time, or for the wrong duration
The following flowchart can be used as a simple tool to help in determining whether or
not a task is safety critical:
Guideline – Human Factors Review of Procedures v0.3
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