What is the formula used to calculate the Working Load Limit (WLL) of a wire rope?

The formula for calculating the Working Load Limit (WLL) of a wire rope is based on the diameter of the rope. The rationale behind using a multiplier of eight comes from standards and safety factors that ensure the rope is used within safe limits for lifting loads. The value of eight represents a balance between safety and utilization; it allows for a significant margin of safety to account for factors such as wear, dynamic loading, and environment, which can affect the integrity of the wire rope during its use.

Using eight times the square of the diameter (in inches) enables a consistent and reliable method to determine the maximum safe load the rope can handle under optimal conditions. This multiplier is established through testing and industry practices, ensuring that users can avoid overstressing the rope and thereby reduce the risk of failure or accidents during lifting operations.