What is “side loading,” and why is it a concern?

Side loading refers to the application of horizontal forces on rigging equipment and the load being lifted. This condition occurs when a load is not being lifted directly vertically, which can lead to unexpected stress on the equipment and the rigging components. The concern with side loading is that it can result in significant mechanical failure of cranes, hoists, or other rigging gear, primarily due to the fact that these systems are designed to handle vertical loads.

When equipment is loaded sideways, it can cause bending moments, torsion, and additional stresses that exceed the equipment's design limitations, potentially leading to catastrophic failure, dropped loads, or accidents on site. Therefore, understanding and mitigating side loading is crucial for maintaining safety and integrity in lifting operations. Proper rigging techniques must ensure that loads are lifted straight up and down to minimize these risks.