What type of reeving would be used for a 4000 lb. capacity portable gas hoist with a 14,500 lb. machine?

For a 4000 lb. capacity portable gas hoist with a machine weight of 14,500 lb., the appropriate reeving type selected is 4:1. Reeving refers to the arrangement of ropes or cables used on a hoist, and it plays a crucial role in determining the mechanical advantage and overall lift capability.

In the context of a 4:1 reeving system, this means that the hoist can lift a load that is four times heavier than its rated capacity. Thus, with this type of reeving, the hoist can safely handle a load significantly above its rated capacity—for instance, lifting loads that may include the weight of the machine as well as any additional weight that may be transported. It ensures that the hoist operates within safe limits by distributing the weight effectively across the ropes, allowing for smoother operation and reduced strain on the hoist mechanism.

This consideration is key, especially when operating with heavy machinery, where safety and efficiency are paramount. A lower mechanical advantage (such as 2:1 or 3:1) would not provide the necessary lifting capacity, while a higher mechanical advantage (5:1) may not be required and could complicate the system unnecessarily, making it less efficient. Therefore