What is shock loading and how can it be prevented?

• A. A load that increases gradually during lift.
• B. A momentary drop in load.
• C. A sudden peak load during lift; prevent with smooth movement, proper rigging, and avoidance of jerky actions.
• D. A permanent load increase.

Answer: (C)

Shock loading is the surge of peak forces that happens when a load is accelerated or decelerated quickly during lifting. The inertia of the load resists sudden changes in motion, so rapid starts, stops, or jerky movements create a transient force that can exceed the static rating of rigging, lines, or equipment.

Prevent it by keeping movement smooth and controlled from lift-off to stop. Avoid jerky actions, abrupt starts or stops, and letting the load swing. Use proper rigging that distributes forces evenly, and guide the load with tag lines or helpers to minimize dynamic swings. Plan the lift with appropriate speed and consider the dynamic load factor to stay within equipment ratings.