What is the primary purpose of a range diagram in crane operations?

The primary purpose of a range diagram in crane operations is to assist in planning a lift. This diagram provides crucial information about the crane's operational limits and capabilities for different configurations and positions. It typically illustrates the crane's reach, lifting capacities, and the effective working radius at various boom angles and extensions. By referring to the range diagram, crane operators and planners can ensure that the lift is executed safely and effectively, adhering to the equipment's specifications and the site conditions. This helps prevent accidents and ensures that loads can be lifted safely within the designated parameters.

The other options, while they may be related to crane operations, do not capture the primary function of a range diagram. Weight capacities are indicated in load charts rather than range diagrams, structural failure measurements are determined through different assessment methods, and crane stability considerations are addressed through stability charts and guidelines specific to crane operation rather than the range diagram itself.