What is the maximum percentage of increase in length that allows for a chain sling to remain in service?

The maximum percentage of increase in length that allows for a chain sling to remain in service is 5%. This limit is set to ensure that the integrity and strength of the sling are maintained. A chain sling that stretches beyond this 5% threshold could indicate a significant reduction in its load-bearing capability, leading to potential safety hazards during lifting operations.

When chains are subjected to loads, they can undergo some elongation due to stress. However, if the elongation exceeds the specified percentage, it may suggest that the sling has been overstressed or damaged. For safety and reliability in rigging practices, it's crucial to adhere to these guidelines, as they help prevent equipment failure and ensure that the rigging remains safe for continued use. Therefore, the 5% threshold serves as a critical standard in the maintenance and use of chain slings in lifting applications.