When overloads and shock loads occur in a rigging operation, the results can be deadly. A failure of gear or equipment can take place at the time the over/shock load happens or in many cases weeks, months or years later.
Most of us are familiar with the statistics used in rigging books and charts on the affects of shock loading. When a load of "X" pounds is allowed to free-fall or is popped off the ground, it introduces a load to the lifting device which can be two times or more its static weight. This compounding of weight takes its tool on the load's internal and external structure, rigging attachment points, all rigging hardware, slings, hoist hook, running ropes, drum and entire hoisting system whether overhead or mobile crane.
Planning for Aftereffects of Shock Loads
A shock load is more than a sudden force. Even when a lift appears successful, the equipment may have absorbed stress that weakens it over time. Recognizing and managing these hidden impacts is critical.
Steps to Reduce Risk
- Conduct post-lift inspections. Examine rigging gear and connections after any suspected shock event to identify wear, cracks, or stretching.
- Log and track incidents. Recording every occurrence builds a history that helps identify patterns and schedule preventative maintenance.
- Control rollback. Whenever possible, guide loads slowly back into position to reduce dynamic strain and avoid repeat shocks.
- Promote reporting. Encourage crews to flag unusual rigging behavior or near misses. Quick reporting allows corrective measures before problems escalate.
Strengthening Team Readiness
Shock loads do not only affect steel and wire rope. They also test the judgment and awareness of the crew. Training that reinforces calm responses and careful inspections strengthens organizational safety culture. Structured debriefs after incidents create learning opportunities and highlight preventive actions.
By pairing disciplined equipment inspections with proactive team practices, companies build resilience into their lifting operations. Managing shock loads effectively helps protect workers, extend equipment life, and preserve productivity.
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