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Rigging safety 7

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  • http://pubs.cas.psu.edu/freepubs/pdfs/h20.pdf
  • http://www.unirope.com/wireropeslings/wrs_ddratioeffects.shtml
  • Transcript

    • 1. Rigging Safetyjohnanewquist@gmail.com
    • 2. Hit by Pulley• Event Date: 07/27/2010• Inspection: 314807090• Employee #1 was struck in the head by a metal pulley when the nylon sling to which it was connected broke.• The pulley was being used to drag felled trees.• When the rigging was put under tension, the nylon sling broke, releasing the pulley, hitting the employee in the head.• 50 M
    • 3. Struck by Form• Event Date: 04/21/2010• Inspection: 314374182• An employee was struck by a falling 20 column form weighing approximately 2,000 pounds that broke loose from its rigging while being moved by crane from one location to another location on the construction site.• 27 M
    • 4. Pipe Fell• Event Date: 04/29/2010• Inspection: 314409277• On 4/29/10 , an employee was struck on the head by a drilling pipe which resulted in fatal injuries.• The employee rigged a 20 foot section of pipe and as it was being lifted by the operator, the pipe came loose from the rigging and fell approximately 10 to 15 feet onto the head of the employee.• The employee died as a result of his injuries.• 50 M Fatality•
    • 5. 10 Rules for Rigging Safety #1• Know the weight of the load• Concrete slab• Steel Beam• Concrete form• Tree
    • 6. Bulk Density• Building material Unit weight• Aluminum 171 pounds per cubic foot• Cast Iron 450 pounds per cubic foot• Cement 94 pounds per cubic foot• Concrete 150 pounds per cubic foot• Crushed Stone 2,500 pounds per cubic yard• Gravel 2,700 pounds per cubic yard
    • 7. 10 Rules for Rigging Safety #2• Know the center of gravity of the load.
    • 8. Center of GravityA load is stable when:– The hook is directly above the center of gravity of the loadEstimate the center of gravityLift the load just enough to clear the groundIf the hook is not over the center of gravity the hookwill travel to the center of gravity CG?
    • 9. Center of GravityIf necessary, set the load down and adjust theriggingIf the load tips more than 3°, the rigging should beadjustedThe longer the sling legs, the more stable the loadwill be B The longer set of sling legs (B) will improve load A stability
    • 10. How Would You Rig This?What would you need in the way of rigging materials?
    • 11. How Would You Rig This?Would it matter ifthe tank were fullor empty?
    • 12. 10 Rules for Rigging Safety #3• Know the rated capacity of slings and hardware.
    • 13. 10 Rules for Rigging Safety #4• Inspect all rigging before use.
    • 14. Rigging equipment for material handling• Synthetic webbing (nylon, polyester, and polypropylene)• Remove from service immediately if: – Acid or caustic burns – Melting or charring of any part of the sling surface – Snags, punctures, tears or cuts – Broken or worn stitches – Distortion of fittings
    • 15. 10 Rules for Rigging Safety #5• Allow for D/d ratio on all wire rope slings.
    • 16. Rigging equipment for material handling D/d Ratio D - is diameter around which sling is bent. D d - is diameter of the sling. d
    • 17. 10 Rules for Rigging Safety #6• Protect sling from sharp surfaces• Dekalb accident• Photo is an example
    • 18. Rigging Protection From Cutting or Slipping Softeners, padding or use of blocking..
    • 19. 10 Rules for Rigging Safety #7• Proper calculation of increased tension caused by sling angles (on all rigging components!).
    • 20. How horizontal angle affects slings capacity 500 LBS500 LBS 1000 LBS 1000 LBS 90 60° 45° 30° 1000 LBS 1000 LBS 1000 LBS 1000 LBS Note: A good operating practice is to keep sling angles from going below 60 degrees
    • 21. 10 Rules for Rigging Safety #8• Keep personnel clear from lift area.• 1926.953(d) requires taglines on any load “where hazards to employees exist” in order to keep the loads under control
    • 22. 10 Rules for Rigging Safety #9• Calculate reductions when using choker hitch
    • 23. Wire Rope Sling Choker Adjustments
    • 24. 10 Rules for Rigging Safety #10• Know the proper crane signals• A signal person is required when:• The point of operation is not in full view of the operator (1926.1419(a)).• The operator’s view is obstructed in the direction the equipment is traveling.• Either the operator or the person handling the load determines that a signal person is needed because of site-specific safety concerns.
    • 25. Questions