Tandem Lifting Calculations
TANDEM LIFTING (Multiple Lift ) When you are considering to lift an special piece in tandem lift with 2 cranes, some quick calculations are needed to know in advance what will be the weight at each crane will be working. Knowing the length, weight and position of the cog (center of gravity) we can easy calculate the weight supported by each crane at different positions where the slings are placed . General example T andem Lift using 2 Mobile boom cranes Any lifting operation which involves more than one crane is classed as a complex lift. BS:7121 :2016 explains it as follows; " Complex lift: lifting operation that requires more than one crane to lift the load, or cranes using load enhancement equipment, lifting of persons or when the lifting operation is at a location with exceptional hazards. (Clause 3.11.3.)" ...