What Does Crane Capacity Mean?
Rated capacity
Rated capacity is the limit specified for a particular crane configuration and set of operating conditions. It must not be treated as a universal capacity for all reaches.
Gross and net load considerations
The lift assessment must account for the load and applicable deductions specified by the manufacturer, including relevant rigging or lifting accessories.
What Is a Crane Load Chart?
Understand the chart
A load chart lists permitted lifting capacities for defined configurations and operating conditions. Operators and the lifting team must use the correct chart for the actual crane.
Check the working radius
Working radius is a key factor in crane capacity. Capacity often changes as the radius increases, so the planned load path and placement point matter.
Confirm boom and setup configuration
Boom length, jib configuration, counterweight, outrigger position and other model-specific conditions can affect permitted capacity.
Information to Confirm Before a Lift
Load weight and dimensions
Use reliable load data and account for lifting accessories as required by the manufacturer chart and procedures.
Ground and environmental conditions
Assess ground support, wind limits, slope and other site conditions against the crane manufacturer requirements.
Equipment and personnel
Confirm inspections, suitable rigging, operator competency, signalling arrangements and the approved lifting plan.
Common Mistakes to Avoid
Using maximum capacity as the working limit
A crane advertised maximum capacity may apply only under specific conditions. It does not automatically apply at the actual radius.
Ignoring changes during the lift
Changes to the load path, setup or site conditions can affect safety. Stop and reassess if the lift no longer matches the approved plan.
Conclusion
Follow the manufacturer instructions
Load charts are technical documents and must be interpreted by competent personnel for the exact crane and lift. Never exceed rated limits.
Important: Lifting and machinery-handling activities should be planned by competent personnel and carried out in accordance with manufacturer instructions, applicable requirements and site-specific safety procedures.