What is WLL in Polyester Slings?

WLL in polyester slings stands for the working load limit. Other synonyms for WLL are normal working load and safe working load. WLL refers to the transportation of the goods to be transported or removed from one place to another with a safe and appropriate safety factor.

How is WLL Determined in Polyester Slings?

Lifting sling manufacturers recommend the maximum carrying capacity of such equipment. The lifting equipment can be a sling, a rope, a winch, a hook or a shackle. The load level of such equipment is measured by WLL. To know the safe working load, the minimum breaking strength of the polyester sling is divided by the safety factor, which is either fixed or assigned to a particular equipment type. Often the safety factor of safety of a particular piece of equipment varies between 4 and 6. If the equipment poses a risk to persons, the safety factor is increased to 10. Working load limit resistances in polyester slings according to their colour are purple 1,000 kg, green 2,000 kg, yellow 3,000 kg, grey 4,000 kg, red 5,000 kg, brown 6,000 kg, blue 8,000 kg and orange 10,000 kg.

How WLL Value Appears in Polyester Slings?

The safe working load limit is defined as the maximum load that lifting equipment can handle. The working load limits of polyester lifting slings are determined by authorised manufacturers and experts. It is the manufacturer’s responsibility to determine the correct WLL value for each lifting equipment. In polyester slings, multiple factors need to be considered to determine the WLL value. Any factor that may affect the working load limits of the lifting slings must be carefully observed. Slings should generally be selected according to the load to be lifted. If the lifted load exceeds the lifting capacity (WLL value) of the slings and attachments, it should never be used.

Factors in Revealing WLL Value in Polyester Slings:

  • The amount of applied load,
  • The length of each rope and line,
  • Sling dimensions,
  • The number of slingshots,
  • Working speed.

What Determines the Working Load Limit of Polyester Slings?

For polyester slings, the WLL value limit specifies the maximum load that must be applied to the sling and must never be exceeded during use to ensure operator safety. Working load limits on slings are determined by connection type, material strength, design factor, and loading angle. A sling’s working load limit can also be affected by the conditions in which the sling is used. For example, the rapid application of a load can create dangerous overload conditions. Also, twisting and knotting of links or sling components can reduce the sling’s working load limit. Environmental conditions such as high temperatures can also affect a sling’s working load limit.

For more detailed information about the products, you can contact Halatsan’s sales team.


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