Load Hoist Sheaves and Boom Tip Sheave Pitch Diameter Requirement

What is the pitch diameter requirement for load hoist sheaves and boom tip sheave?

a) 1.5
b) 2
c) 2.5
d) 3

Answer:

The pitch diameters of load hoist sheaves and boom tip sheave should not be less than twenty times the nominal diameter of the rope used for safe and efficient operation.

Explanation: In the context of engineering, particularly when dealing with cranes and lifting equipment, it is crucial that the pitch diameters of load hoist sheaves and boom tip sheave are not less than twenty times (20x) the nominal diameter of the rope used. This standard is designed for the safety and efficiency of the operation. Larger sheave diameters relative to the rope diameter decrease the bending stress in the rope, extending its life and reducing possible risk of failure.