In a multi-crane lift operation with 2 cranes, what percentage of the load share must be added to each crane's capacity?

In a multi-crane lift operation, it is essential to account for the dynamics of lifting loads with multiple cranes to ensure safety and efficiency. When two cranes are lifting a common load, it's standard practice to add a certain percentage to each crane's capacity to accommodate any potential variation in load distribution and to provide a margin of safety.

Adding 20% to each crane's capacity recognizes the need for an additional safety factor because lifting a load with more than one crane can lead to uneven stress on the cranes. This is due to various factors such as slight differences in crane heights, positions, and load tolerances, which can result in one crane bearing more load than anticipated. Adding this percentage helps to ensure that both cranes can manage the load effectively while minimizing the risk of overload and failure.

This approach aligns with safety standards in rigging practices and ensures that the operation can proceed without compromising the structural integrity of either crane or the safety of the personnel involved. By utilizing this added capacity, operators can better manage the uncertainties inherent in multi-crane operations.