Which indicator provides information about the load radius in crane operations?

The radius indicator is specifically designed to provide information about the load radius in crane operations. This measurement is crucial because it directly impacts the lifting capacity of the crane. As the distance from the center of the crane’s rotation to the load increases, the lifting capacity typically decreases due to the mechanical leverage involved. The radius indicator helps operators maintain awareness of this critical parameter, allowing them to make informed decisions about lifting operations and ensuring safety by avoiding overloading the crane.

In contrast, the hoist drum indicator primarily indicates the amount of wire rope that has been reeled in or paid out, which is important for determining the height of the lift but does not provide information about load radius. The boom length indicator indicates the length of the boom extended but does not correlate directly with the load radius. An anti two-blocking device is a safety feature designed to prevent the hook from coming too close to the boom tip, which guards against certain types of accidents but does not relay information about load radius.