What is the difference between SWL and WLL? #construction #materialhandling #liftingequipment

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SWL stands for Safe Working Load. WLL stands for Working Load Limit.

SWL, or Safe Working Load, is an old term. In the United States, we stopped using the term Safe Working Load about 20 years ago. Europe and ISO standards also stopped using the term a few years later. The term was replaced with WLL for basically everything below the hook, and Rated Capacity for cranes, hoists, and winches.

Why? There are legal implications to implying something is “safe.” So, SWL should no longer be used, and Working Load Limit should be used when referring to a piece of riggings’ maximum working load.

ASME B30.26-2015 Rigging Hardware: working load limit (WLL): see rated load.

ASME B30.26-2015 Rigging Hardware: rated load: the maximum allowable working load established by the rigging hardware manufacturer. The terms rated capacity and working load limit are commonly used to describe rated load.
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Interchangeable is what it sounds like to me for purposes of rigging.

jacobwrona