According to ASME B30.3, what is the minimum pitch diameter for boom hoist sheaves?

The minimum pitch diameter for boom hoist sheaves, as stated in the ASME B30.3 standard, is crucial for ensuring proper operation and longevity of the hoisting system. Selecting a pitch diameter that is appropriate in relation to the rope diameter helps prevent excessive wear on the rope and sheave, and allows for optimal line movement.

The ASME B30.3 standard specifies that the minimum pitch diameter should be at least 15 times the diameter of the rope used. This ratio helps maintain the proper bending radius for the rope as it travels over the sheave, which is essential for minimizing stress and fatigue on the rope fibers. By adhering to this standard, operators can ensure safe and efficient operation of the crane, thus reducing the risk of failure or accidents related to improper sheave sizing.

Other options, while having their own values, do not meet the standard for minimum pitch diameter as defined in ASME B30.3, making them unsuitable for the application.