One of the most serious hazards associated with cranes is the potential collapse of the equipment caused by exceeding its rated capacity.
What Is Rated Capacity?
Rated capacity is defined as:
“The maximum working load permitted by the manufacturer under specified working conditions. These conditions typically include a specific combination of factors such as equipment configuration, boom length, load radius, and other parameters.”
Understanding the Load Chart
- Each crane has a load chart specifying the maximum weight it can safely lift at various boom lengths and radii.
- Key point: As the lift radius increases, the crane’s lifting capacity decreases.
- The load chart must always be on the crane and accessible to the operator.
Safe Operation Practices
- Never exceed the crane’s rated capacity.
- Account for variable worksite conditions—factors such as load swinging due to wind or uneven terrain may reduce safe lifting capacity below the ideal rated value.
- Know the weight of the load before lifting:
- Use reliable methods to determine load weight.
- Do not guess or rely on estimates.
Following these procedures ensures that crane operations remain safe, helping to prevent equipment failure and serious injury.