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Qualitative methods for occupational risk prevention strategies in safety

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

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Qualitative methods for occupational risk prevention strategies in safety

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  1. Qualitative methods for occupational risk prevention strategies in safety Paul Swuste Safety Science Group, Delft University of Technology The Netherlands

  2. Topics Control Banding principles of Control Banding Models of accident causation Swiss cheese Bow-tie central events Vertical lifting of loads central events barrier failures Control Banding and Safety

  3. Principles of Control Banding You measure: hazard indication, exposure scenario’s You compare: banding principles You control: banding principles

  4. Swiss cheese, Reason 1997

  5. Blame Swiss cheese, blame Wrong action Accident Wrong decision Wrong design Deviating conditions Wrong action Wrong action

  6. People F1 F1 F3 F3 or or F11 F11 F11 F11 F4 F4 Environment F2 F2 F10 F10 F10 F9 F9 Central event and and F12 F12 F12 F12 Equipment F6 F6 F8 F8 F13 F13 F13 F13 F7 F7 and and Reputation F5 F5 Bow tie model Fault tree, scenario’s and primary barriers Event tree, scenario and effect reducing barriers

  7. Henri Riviere, Tour Eiffel, 1902

  8. Central events, 13.000 accidents, 1998-2003 • Falling from heights • Contact with moving parts of fixed machinery • Contact with falling objects • Stuck by vehicle • Loss of control in or on moving vehicles • Contact with hoisted, hanging, swinging objects • Contact with object a person in holding, using, carrying • Contact with handheld tools • Contact of moving person against object • Contact with charged objects • Loss of control of hazardous chemicals

  9. 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 %

  10. 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)

  11. Control Banding and Safety You measure: list of central events, scenario’s You compare: frequency rates You control: banding principles (?)

  12. Small Sized Enterprises

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