When are certified rigging calculations or load cells recommended?

• A. When available to verify load weight and CG location
• B. Only for offshore cranes
• C. Never use them
• D. When there is no need to verify load weight

Answer: (D)

The main idea is to verify the actual load weight and where the load’s center of gravity sits so you can plan a safe lift. Certified rigging calculations give you a documented estimate of weight and CG and help you choose the right slings, spreader, and rigging geometry. Load cells provide real-time measurements of the forces in each lifting line, letting you confirm that the weight, angles, and balance match what the crane’s capacity and load chart allow.

Use these tools whenever weight or CG isn’t certain, when the load is complex or irregular, or when the lift is critical or near capacity. They’re valuable for ensuring the equipment isn’t overstressed and the load path remains safe. They aren’t limited to offshore cranes and aren’t only for situations with no need to verify—quite the opposite: they’re most useful when you do need assurance that the lift can be performed safely.