The working load limit (WLL) and safe working limit (SWL) are both important measures to consider when choosing the right cable hoist for the job. But what’s the difference between the two? And which one should you use? Here’s a breakdown of WLL and SWL and when to use each.
What is WLL?
WLL is the working load limit and refers to the maximum weight that should be applied to a particular object. The WLL is determined by the manufacturer and is usually stamped on the product. It’s important to note that the WLL is different than the breaking strength, which is the point at which an object will actually break. The WLL is always less than the breaking strength to account for factors such as shock loading or unexpected environmental conditions. Always use caution when handling objects with a WLL and be sure not to exceed the recommended limit.
What is SWL?
SWL refers to the maximum weight that can safely be lifted by a particular crane or piece of machinery. The term is also used to refer to the maximum weight that can safely be held by a particular chain, rope, or other rigging material. SWL is generally expressed in terms of pounds or tons. To determine the SWL of a particular crane, one must first assess the strength of the crane’s structure and its ability to withstand the loads imposed by various weights. The SWL of a particular rigging material is determined by its size, type, and grade. SWL is an important consideration in any lifting or rigging operation. All workers involved in such operations should be aware of the SWLs of the equipment and materials they are using. SWLs should also be prominently displayed on all lifting and rigging equipment.
Differences between WLL and SWL
WLL (working load limit) and SWL (safe working load) are two terms that are often used interchangeably, but there is actually a subtle difference between the two. WLL refers to the maximum weight that a piece of equipment can safely support when used as intended, while SWL is the maximum weight that a piece of equipment can safely support under any circumstances. In other words, WLL is the safe weight limit for normal use, while SWL takes into account all potential sources of stress on the equipment. As a result, SWL is always equal to or lower than WLL. It’s important to be aware of these differences when using lifting equipment, as exceeding either limit can lead to serious accidents.
Conclusion
So, what is the difference between a WLL and SWL? A WLL is the maximum load that can be applied to a structure or component continuously without causing failure. The SWL, on the other hand, is the maximum load that can be applied to a structure or component for a short period of time without causing failure. When it comes to working with wire rope, it is important to remember that the WLL should never be exceeded, while the SWL can occasionally be surpassed when necessary.
