Working Load Limit is the maximum working load in application. No matter it is a lifting sling or cargo control products, the only thing you need to care about is Working Load Limit or Safety Work Limit.
You may also come across another terminology as Min. Breaking Strength. Its basic relationship is as belows:
Min. Breaking Strength = Working Load Limit x Safety Factor
In different sceanario, the safety factor can be quite different:
1) For Lifting Sling
In Europe, the safety factor is 7 to 1.
While in the United States, it is 5 to 1.
2) For Cargo Control
In Europe, the safety factor is 2 to 1.
While in the United States, it is 3 to 1.
The Working Load Limit (W.L.L.) is more important than Breaking Strength (B.S.) when choosing a strap. W.L.L. is 1/3 of the breaking strength because a load will triple in weight when G-Forces are applied.
To pick the correct straps make sure combined W.L.L. = Weight of Cargo
NOTE: Check local laws and regulations to ensure correct number of straps are used for your type of load. Different types of cargo can require minimum number of tie downs.
Based on W.L.L. and laws/regulations, it is the responsibility of the user to determine the number of straps needed to secure his load safely.
Let us take the cargo control product in US for example:
If your load is 1,000 lbs. it becomes 3,000 lbs. with G-Forces applied.
You would need the below tie down options to safely secure:
- 2 Straps with 500 lbs. W.L.L. and 1,500 lbs. Break Strength
- 4 Straps with 250 lbs. W.L.L. and 1,000 lbs. Break Strength
With these options, you have successfully:
- Combined W.L.L. = Weight of Cargo (1,000 lbs.)
- Combined B.S. = Weight of Cargo with G-Forces applied (3,000 lbs.)
Are you clear with all these now?
Please make inquiry to me for further information.
Post time: Dec-02-2020