how to calculate lifting capacity of crane

When planning a job that requires the use of a crane, it’s essential to know the crane’s lifting capacity. This information will help you determine whether the crane is suitable for the job you have in mind and ensure it’s operated safely. Calculating the lifting capacity of a crane involves several factors, including the crane’s inherent structural features, which impact the crane’s performance. In this article, we’ll detail how to calculate the lifting capacity of a crane.

The Crane’s Structural Features

The configuration and structural features of a crane affect its lifting capacity. These features include boom length, boom angle, and the length of the jib and their angles. The length and angle of the combined boom and jib sections determine the crane’s radius. This dimension determines the support base, and the crane’s load chart is based on this information. Crane manufacturers provide load charts that list the maximum weight that each crane model can lift at various extensions, boom angles, and jib lengths.

Factors Affecting Lifting Capacity

Several factors can affect the lifting capacity of a crane. These factors include the crane’s current position, the crane operator’s experience, the condition of the equipment, and the weight and quantity of loads being lifted. The load must be lifted, moved, and positioned over the center of the lift chart’s intended area to provide the crane’s optimum capacity. Any deviation from this area may result in a loss of lifting capacity.

Calculating Lifting Capacity

To calculate the lifting capacity of a crane, first, locate the crane’s load chart. The load chart displays the crane’s maximum load capacity concerning boom length and angle. Identify the boom length and angle of the crane being used. Next, identify the area where the lift will be performed. This area is represented by the crane’s radius. The radius is defined as the distance from the crane’s center to the edge of the load. Once the radius is determined, find the corresponding lifting capacity displayed in the chart.

Conclusion

Knowing a crane’s lifting capacity will help ensure the safety of crane operators and construction workers on the job site. The calculation of the lifting capacity involves identifying the crane’s structural features, locating the load chart, and considering several factors that may impact the crane’s performance. It’s essential to follow all safety guidelines when operating a crane and to verify the crane’s lifting capacity before undertaking any work.