Projects

AN APPROACH FOR EVALUATING IMPROVEMENT OF RELIABILITY OF DRAGLINE SYSTEM

Dragline system is a high capacity, capital intensive and specialized
mining equipment in Open Cast Mines that are used to extract coal by removing
overburden. Performance of a dragline system depends on reliability, availability &
maintainability characteristic of the system & its six sub-systems namely Drag, Hoist,
Swing, Power Drive, Propel &others. It is essential that all the subsystems remain in
operating state for maximum possible time duration for efficient working of the
dragline system.

 

A typical dragline can move about 30 crore cubic metres of
overburden a year and equates to generate approximately 1 lac revenue per hr. Hence
reliability modelling of dragline system and further improvement of reliability of the
dragline system plays significant role. This paper outlines the improvement of
reliability of two subsystems of dragline namely drag and hoist. Failure Data Analysis
act as a very important tool for Reliability Modelling of Dragline System.

 

As the Operating Time Between Failure (OTBF) are not homogenous. Therefore Non-
Homogenous Poisson(NHP) process is considered as a model befitting to the
Situation. The reliability of the drag is found to be 0.4742 (47.42%) and the
reliability of the hoist is found to be 0.5931 (59.31 %) by the application of this
methodology. Improvement of reliability for drag is evaluated to be 40.65 % and
improvement of reliability for drag is evaluated to be 37.19 %



Tags :
4.666665
Your rating: None Average: 4.7 (3 votes)

Posted by



Wed, 06/04/2011 - 23:58

Share

Collaborate