Reliability analysis for two draglines in Tunçbilek lignite mine

Tuncay, Deniz
In modern mining activities, high-capacity complex machines are used and their availability plays a big role on the mine productivity. Draglines are one of the high capacity mining machines which result in decrease in production in case of failure or unavailability. This study aims to determine the effects of different components of two draglines (PAGE 736 and MARION 7820) to their availability and operability by choosing adequate reliability models and conducting fault tree analyses. Reliability analysis was conducted using the failure data of the draglines provided by the Western Lignite Enterprises (GLİ) lignite mine in Tunçbilek/Kütahya to determine the change in the draglines’ reliability with respect to time. Reliability analyses were conducted by determining failure probability models. Fault tree analysis helped us understand the relations between the sub-units of each dragline with the help of a symbolic logic model. These analyses were also used to determine the critical elements which mostly affect the draglines reliability. Bucket units were distinguished to be more prone to failure for both draglines but when looked at components, components from other units were determined to have lower reliability, hence may need special attention. Also, the components with the highest reliability importance values were found to be changing with time when the draglines are operating. The results of this study should be considered when preparing a maintenance plan to concentrate on the components that have higher effect on the dragline’s reliability.
Citation Formats
D. Tuncay, “Reliability analysis for two draglines in Tunçbilek lignite mine,” M.S. - Master of Science, Middle East Technical University, 2014.