درباره ما
NASA-LLIS-0239
Lessons Learned - Lifting Slings for Cranes
Year: 1993
Abstract: Description of Driving Event:
During a crane disassembly, a cable sling broke, dropping a 10 ton crane counterweight. The crane crew was removing the front counterweight from the crane to place it on a flat bed trailer when the mishap occurred. The sling used was a rusty, 4 leg, 5/8 inch diameter cable about 15 feet long. Only two legs were used during this lifting operation.
The investigating committee found that calculations made from a standard table published by U.S. Steel showed that the allowable working load for a new cable of this size using 2 legs was only 5.28 tons. The crane operators, based on their experience and intuition, grossly underestimated the strength of the sling.
During a crane disassembly, a cable sling broke, dropping a 10 ton crane counterweight. The crane crew was removing the front counterweight from the crane to place it on a flat bed trailer when the mishap occurred. The sling used was a rusty, 4 leg, 5/8 inch diameter cable about 15 feet long. Only two legs were used during this lifting operation.
The investigating committee found that calculations made from a standard table published by U.S. Steel showed that the allowable working load for a new cable of this size using 2 legs was only 5.28 tons. The crane operators, based on their experience and intuition, grossly underestimated the strength of the sling.
Subject: Lifting Devices
Show full item record
| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T18:16:50Z | |
| date available | 2017-09-04T18:16:50Z | |
| date copyright | 07/09/1993 | |
| date issued | 1993 | |
| identifier other | HNZCQCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsery=autho162s7D8308/handle/yse/199778 | |
| description abstract | Description of Driving Event: During a crane disassembly, a cable sling broke, dropping a 10 ton crane counterweight. The crane crew was removing the front counterweight from the crane to place it on a flat bed trailer when the mishap occurred. The sling used was a rusty, 4 leg, 5/8 inch diameter cable about 15 feet long. Only two legs were used during this lifting operation. The investigating committee found that calculations made from a standard table published by U.S. Steel showed that the allowable working load for a new cable of this size using 2 legs was only 5.28 tons. The crane operators, based on their experience and intuition, grossly underestimated the strength of the sling. | |
| language | English | |
| title | NASA-LLIS-0239 | num |
| title | Lessons Learned - Lifting Slings for Cranes | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1993 | |
| contenttype | fulltext | |
| subject keywords | Lifting Devices |