If participating in a multi-crane lift operation of 4 or more cranes, what percentage of the load share must be added to each crane’s capacity?

In a multi-crane lift operation involving four or more cranes, it is crucial to ensure that each crane is adequately rated to handle its share of the load while also factoring in additional safety measures for overall rigging stability. The requirement to add 50% to each crane's capacity is rooted in safe lifting practices that accommodate potential dynamic effects, load distribution variances, and unforeseen stresses on the equipment.

When dividing the load among multiple cranes, each crane must not only support its designated portion of the load but also be prepared for scenarios where factors such as load sway, wind effects, and other dynamic challenges may impact the overall lifting operation. By adding 50% to each crane’s capacity, you create a buffer against these variables, ensuring that each crane can safely manage its load under varying conditions, which enhances the safety and effectiveness of the lift.

This principle is a best practice in rigging and lifting operations, emphasizing the importance of conservative planning when sharing heavy lifts across multiple cranes to mitigate the risk of failure and ensure operational safety.