How is the working load limit of slings determined?

The working load limit (WLL) of slings is determined by dividing the breaking strength of the sling by the design factor. This method ensures that the sling can safely handle the loads it will encounter in practical use without exceeding its strength limits. The breaking strength is the maximum load the sling can withstand before failure, while the design factor accounts for safety margins in typical operating conditions and varies based on the material and type of sling being used.

By applying this calculation, users can ensure that slings are not overstressed in lifting applications, which is crucial for maintaining safety on the job site. In this context, if the breaking strength is too high relative to the applied loads, the sling could still be classified as safe without risking failure, provided that the design factor is appropriately leveraged. This practice is a fundamental principle in rigging to uphold safety standards and protect personnel and equipment.