Coal Production by Longwall mining- A Study and Analysis of Equipment Breakdown Cause Patterns

Krishna Reddy Bhimavarapu

Coal production is a very complex process. It involves several causes of equipment breakdowns leading to down times. These down times reduce the production drastically depending up on their nature and type of breakdown. Ultimate result of these breakdowns is low productivity and stress on the managerial personal for repairing and bringing back the equipment into working condition. The present paper attempts to identify the causes of down times of equipment and to find out the inter relationships between them. To check for the association between the occurrences of C1 to C12 a bi-variate frequency table has been obtained from among the occurrences of the variables and a Chi-square test has been applied.