SITUATION: Nylon Sling Failure
A contract crew was in the process of lifting the 45’ leg for a switch structure when the Nylon sling they were using snapped. The sling had a choke rating of 5000 pounds. The column weighed between 4000 and 4400 pounds. The crew put a choke on the column about 10’ from the top end, and the column was about 10-15’ off the ground when the sling snapped. The sling manufacturer was called to the job site for the investigation. Upon inspection of the sling, the manufacturer determined that the sling must have made contact with a sharp object that cut it during the lift. Prior to this incident, three columns were lifted using this sling. Close inspection of the sling shows a straight, sharp end where the sling separated. This is consistent with a cut. A break would have yielded an irregular separation.