When a choker hitch angle is less than 120 degrees, how is the allowable sling load calculated?

When a choker hitch angle is less than 120 degrees, how is the allowable sling load calculated?

• A. (choker rated capacity) ÷ (IWRC capacity multiplier)
• B. (choker rated capacity) - 5%
• C. (IWRC capacity multiplier) x (choker rated capacity) squared
• D. (choker rated capacity) x (IWRC capacity multiplier)

Answer: (D)

When a choker hitch forms a tight wrap around the load (angle less than 120 degrees), the safe sling load is found by adjusting the choker rated capacity with the IWRC capacity multiplier. The choker rating provides the baseline strength, but the Independent Wire Rope Core (IWRC) factor accounts for how the rope’s core and the acute angle affect strength in this configuration. Therefore, you multiply the choker rated capacity by the IWRC capacity multiplier to obtain the allowable sling load. The other mathematical forms don’t reflect how the standard accounts for the angle and core effects.

When a choker hitch forms a tight wrap around the load (angle less than 120 degrees), the safe sling load is found by adjusting the choker rated capacity with the IWRC capacity multiplier. The choker rating provides the baseline strength, but the Independent Wire Rope Core (IWRC) factor accounts for how the rope’s core and the acute angle affect strength in this configuration. Therefore, you multiply the choker rated capacity by the IWRC capacity multiplier to obtain the allowable sling load. The other mathematical forms don’t reflect how the standard accounts for the angle and core effects.