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:
“Children also need opportunities to practice being less than perfect. They can afford to be ill tempered with us because it is our love that is most constant. This is the essence of unconditional love.... Our steadfast love provides a safe haven.”
—Cathy Rindner Tempelsman (20th century)
“... probably all of the women in this book are working to make part of the same quilt to keep us from freezing to death in a world that grows harsher and bleaker—where male is the norm and the ideal human being is hard, violent and cold: a macho rock. Every woman who makes of her living something strong and good is sharing bread with us.”
—Marge Piercy (b. 1936)
“Tobacco and opium have broad backs, and will cheerfully carry the load of armies, if you choose to make them pay high for such joy as they give and such harm as they do.”
—Ralph Waldo Emerson (1803–1882)