What is the choker capacity for chain slings in vertical configuration?

What is the choker capacity for chain slings in vertical configuration?

• A. 60%
• B. 80%
• C. 100%
• D. 120%

Answer: (B)

When a chain sling is used in a choker configuration, its effective lifting capacity is reduced compared to a straight vertical lift. In a choker hitch, the chain tightens around the load, creating a higher concentration of load on a shorter contact area and increasing bending and friction losses. Because of these factors, the rated capacity is typically reduced to 80% of the sling’s vertical (straight) capacity. So, for a chain sling in vertical configuration, the choker capacity is 80% of that vertical rating. The other options would either overstate or understate the reduction: 100% would be the full vertical rating, not accounting for the choker's efficiency loss; 60% and 120% are not the standard factors used for this configuration.

When a chain sling is used in a choker configuration, its effective lifting capacity is reduced compared to a straight vertical lift. In a choker hitch, the chain tightens around the load, creating a higher concentration of load on a shorter contact area and increasing bending and friction losses. Because of these factors, the rated capacity is typically reduced to 80% of the sling’s vertical (straight) capacity. So, for a chain sling in vertical configuration, the choker capacity is 80% of that vertical rating. The other options would either overstate or understate the reduction: 100% would be the full vertical rating, not accounting for the choker's efficiency loss; 60% and 120% are not the standard factors used for this configuration.