(2010).Īpplied mathematics for safety professionals. Safety professional’s reference and study guide. When lifting loads with large surfaces exposed to wind such as rotor blades or complete propeller units for wind power plants (WPP) the standard values provided by EN 13000 (see appendix chapter 7.3), which are the basis for the crane calculations, can be significantly exceeded. (2002).īechtel rigging handbook (2nd ed.). Occupational Safety and Health Administration (OSHA). Northeastern State University at Broken arrow
MULTIPLE CRANE LIFT CALCULATIONS PROFESSIONAL
Preparation for the Certified Safety Professional Examinations Introduction to Sling Load Tension Calculations Tension on Sling T (1, 2) = ( L 1, 2 / v 1, 2 ) ( W / 2 ) Crane Configuration Radius: 12m Boom length: 32.4m (Crane can lift 4.5 tons) Crane Utilisation Load 4t x 100 4.5 88.8 Crane Utilization too high for hazardous area (Chemical Plant) You would need to Reduce Boom Length or Reduce Crane Radius Load 4t (10m) x 100 5t 80.0 Crane Utilization Good 1. Tension on Sling T (1, 2) = W / ( # legs sin(a 1, 2)) Assess the wind and weather to ensure the safe operation of the multiple crane. Determine communication methods and test those communication methods prior to commencing the lift. Select personnel with appropriate qualifications and experience to undertake the lift. Tension on Sling T (1, 2) = ( V1 2 + H1 2 ) (1/2) Assign cranes that meet the lift criteria specified in the planning. To attach the load, locate the center of gravity, position the crane hook directly above the center of gravity, and then rig the load so that it will lift level and true. Rigging shall be configured such that slings do not reeve or slip through the hook.
4 or more cranes add 50 per cent of the calculated share of the load. 3 cranes add 33 per cent of the calculated share of the load c. 2 cranes add 20 per cent of the calculated share of the load b. Sling stresses and sling angles will also be unequal. The percentage depends on the number of cranes involved in the lift, depicted as follows for each crane: a. For this reason, when the center of gravity is closer to one point of the sling attachment than to the other, the slings must be of unequal length.
While slight variations are usually permissible, if the crane hook is too far to one side of the center of gravity, dangerous tilting will result and should be corrected at once. To make a level lift, the crane hook or point of suspension must be directly above this point. The center of gravity of an object is a point around which the entire weight may be concentrated. Diameter of curvature around which the sling is bent.
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