Crane lift plan calculations
“Safety Issues in Wind Turbine Installation and Transportation” indicates that if a drag coefficient is not known, it is permissible to use a drag coefficient of 2.4. Wind turbine companies are increasingly able to provide this sort of information, for example, but more commonly this information is not available. The mxanufacturer may have complete detailed calculations or have conducted wind tunnel testing. In the first instance, is it recommended that surface area information be requested from the manufacturer of the load. In this respect, wind tunnel testing may also be relevant but typically out of the scope of a typical crane hirer or contactor. Various standards and publications provide different calculation methods (with various differences in results that are borne out of the need to simplify something that is truly complex). The drag coefficient can be incredibly complex to determine accurately. Conversely, the “boxy but good” Volvo 244 has a less flattering drag coefficient in the range of 0.47. For example, the most aerodynamic production car in the world, a VW XL1, has a drag coefficient of 0.189. The drag coefficient is more or less a measure of how easily the object “slips” through the wind. For example, for a 6.1m long (12’) shipping container the projected area is 6.1m x 2.6m = 15.86m2. The projected area is the net area of the load perpendicular to the load. The surface area is made up of two components, where the total surface area is calculated by the following formula:
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This article focuses on calculating the surface area of a load. The load mass and load chart wind speed are pieces of information that are relatively easy to obtain.
#Crane lift plan calculations how to#
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#Crane lift plan calculations manuals#
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