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Qualitative methods for occupational risk prevention strategies in safety. Paul Swuste Safety Science Group, Delft University of Technology The Netherlands. Topics. Control Banding principles of Control Banding Models of accident causation Swiss cheese Bow-tie central events - PowerPoint PPT Presentation
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Qualitative methods for occupational risk prevention strategies in safety
Paul SwusteSafety Science Group, Delft University of Technology
The Netherlands
Topics
Control Bandingprinciples of Control Banding
Models of accident causationSwiss cheeseBow-tiecentral events
Vertical lifting of loadscentral eventsbarrier failures
Control Banding and Safety
Principles of Control Banding
You measure: hazard indication, exposure scenario’s
You compare: banding principles
You control: banding principles
Swiss cheese, Reason 1997
Wrong decision
Wrongdesign
Deviatingconditions
Wrongaction
Wrongaction
Wrongaction
Accident
Blame
Swiss cheese, blame
Bow tie model
and
and
or
F1
F3F4
F5
F7F8
F2F9
F6
and
and
or
F1
F3F4
F5
F7F8
F2F9
F6
F10
F11
F12
F13
F10
F11
F12
F13
F10
F11
F12
F13
People
Equipment
Reputation
Environment
F11
F12
F13
Central event
Fault tree, scenario’s and primary barriers Event tree, scenario and effect reducing barriers
Henri Riviere, Tour Eiffel, 1902
Central events, 13.000 accidents, 1998-2003
1. Falling from heights
2. Contact with moving parts of fixed machinery
3. Contact with falling objects
4. Stuck by vehicle
5. Loss of control in or on moving vehicles
6. Contact with hoisted, hanging, swinging objects
7. Contact with object a person in holding, using, carrying
8. Contact with handheld tools
9. Contact of moving person against object
10. Contact with charged objects
11. Loss of control of hazardous chemicals
Central events of crane operations (n=174)
Instability load 72 %
Contact counter weight, or jib 11 %
Instability crane 7 %
Instability hoisting gear 5 %
Instability jib 3 %
Barrier failures, instability load
Safety barriers (hardware)• Improper connection load, equipment failure• Failing load securing mechanism, killer hook
Management factors• Improper connection, motivation• Improper connection, competence failure• Ground location failure, communication failure• Substandard external conditions (big blue)
Control Banding and Safety
You measure: list of central events, scenario’s
You compare: frequency rates
You control: banding principles (?)
Small Sized Enterprises