Safe working load
Safe Working Load (SWL) sometimes stated as the Normal Working Load (NWL)[1] 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[2][3][4]
Other synonyms include Weight Load Limit (WLL), which is the maximum working load designed by the manufacturer.[2] 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
References
- ↑ karstsports. "MAILLION RAPIDE". http://www.karstsports.com/34400.html. Retrieved 27 September 2012.
- ↑ 2.0 2.1 Lifiting and Hoisting - Glossary of Terms
- ↑ SWL. "safe working load". http://www.businessdictionary.com/definition/safe-working-load-SWL.html. Retrieved 27 September 2012.
- ↑ Working Load. "Working Load & Safety Factors". http://amtecgrips.com/working-load-safety-factors. Retrieved 28 September 2012.
