These calculations assume that the crane’s load line is plumb with no side loading.
Note that distances are measured to the lift lug holes from the CG. Once we have the necessary data, the load share for each crane can be determined. Remember, if we guess at the CG location, we are guessing at the load weight which can lead to accidents. However, the load distribution cannot be calculated accurately without it and this must be impressed upon the owner of the load if the lift is to be done safely.
Of these three factors, the hardest to get is usually the CG. These are the load weight, the load center of gravity (CG), and in some cases, the load geometry. To obtain this most basic piece of information for a multi-crane lift, three factors must be known first. This is generally due to the load interaction between the cranes.ĭespite the risks, it is not uncommon for multi-crane lifts to be conducted without the operator’s knowing the exact load that will be lifted by his/her crane. One source described two crane lifts as being more than twice as risky as single crane lifts with even more disproportionate increases in risk as more cranes are added. Multiple crane lifts can be tricky business.
January 2005 Understanding Load Sharing In Multi-Crane Lifts Sudbury Non Destructive Testing Services.Lift Equipment Inspection & Engineering.
