Safe Working Load (SWL) sometimes stated as the Normal Working Load (NWL) is the load that a piece of Lifting Equipment, lifting device or accessory can safely lift, suspend, or lower without fear of breaking. Usually marked on the equipment by the manufacturer and is often 1/5 of the Minimum Breaking Strength (MBS) although other fractions may be used such as 1/4, 1/6 and 1/10
Other synonyms include Working Load Limit (WLL), which is the maximum working load designed by the manufacturer. The load represents a mass or force that is much less than that required to make the lifting equipment fail or yield, also known as the Minimum Breaking Load (MBL). The SWL is calculated using a safety factor For example, 5:1 (5 to 1, or 1/5). An example of this would be a chain that has a MBL of 2000 lbs would have a SWL or WLL of 400 lbs if a safety factor of 5 (5 to 1) is used
Famous quotes containing the words safe, working and/or load:
“The generality of virtuous women are like hidden treasures—they are safe only because nobody has sought after them.”
—François, Duc De La Rochefoucauld (1613–1680)
“Knowing how beleaguered working mothers truly are—knowing because I am one of them—I am still amazed at how one need only say “I work” to be forgiven all expectation, to be assigned almost a handicapped status that no decent human being would burden further with demands. “I work” has become the universally accepted excuse, invoked as an all-purpose explanation for bowing out, not participating, letting others down, or otherwise behaving inexcusably.”
—Melinda M. Marshall (20th century)
“Men so noble,
However faulty, yet should find respect
For what they have been. ‘Tis a cruelty
To load a falling man.”
—William Shakespeare (1564–1616)