Originally Posted by davidpm
Are you sure about that. I was under the impression that if you had a crane cable that was in service for 30 years someone would think about replacing it.
Don't you keep records of replacement and inspections for all were parts? How old are the oldest parts?
Also is shock loading much of an issue?
What is the safety factor engineered in?
Don't you keep records of replacement and inspections for all wear parts? Yes we do.
How old are the oldest parts? Some cable is 40 years old (100 ton crane)- only replace if it fails inspection.
Also is shock loading much of an issue? Shock loading is not much of an issue if you have a proper crane operator.
What is the safety factor engineered in? The loads on lifting equipment are 1 to 5, that is we take load up to 20% of breaking strength of the item. This matches somewhat to most recommendations that rigging cable stay at 20% or below, although some may go up to 30%.