Correlation between predicted and actual service life of ropes in mining installations+
Ropes used in mining installations are highly strained elements which must be inspected regularly; when reaching their discard state they must be replaced. Changing the rope is very time-consuming and also expensive. Therefore the possibility of calculating the service life of the rope directly from data provided by the reeving system is highly desirable. There is a method of calculating the service life of ropes in reeving systems which has been employed successfully for years. The correlation of calculated and actual service life in operation has proved satisfactory. Same time ago this method was extended to mining installations. Only Koepe-installations with two cages and the friction sheave in ground position were considered. The result was a satisfactory correlation between calculated and actually achieved service life of the rope. In the following paper this method of calculation is extended to other types of mining installations and the calculated rope lifetimes will be compared with the respective actual service lives. It will be demonstrated that the calculated rope lifetimes will correspond very well with the actual service lives achieved in operation. In the mining installations which were evaluated Casar special wire ropes were used as well as those of other manufacturers. The service life in operation of Casar special wire ropes will be compared with the calculated as well as with the actual service lives achieved by those others.
Author(s): Briem, U.