What is the minimum flange clearance for a fully loaded hoist drum according to ASME B30.5?

The minimum flange clearance for a fully loaded hoist drum is specified to ensure safe operation and to prevent the potential for the rope to become pinched or entangled. According to ASME B30.5, the correct minimum flange clearance is indeed ½ inch. This clearance allows for adequate space between the rope and the drum flanges while the crane is under load, ensuring that the rope can move freely without risk of coming into contact with the flanges or becoming jammed, which can lead to serious safety issues or mechanical failure.

Maintaining proper flange clearance is essential for the longevity of both the crane equipment and the hoisting rope, preventing excessive wear and extending the life cycle of the components involved in the lifting operation. This standard reflects best practices in the industry, ensuring that crane operators can perform their tasks safely and effectively.