An analysis of the failure frequency of machines in an enterprise characterised by a changeable production level

The article presents the results of investigations into the failure frequency of a selected strategic machine, i.e. a plastic extruder working in an enterprise manufacturing pre-insulated pipes for the needs of the heatgenerating industry. The analysis has been focused on the time of failure-free work, the time of waiting for a failure to be repaired and the time of failure removal by means of MTBF, MTTR and MTR indicators. The analysis has been conducted in the aspect of machine’s work with uneven load, which is forced by the seasonal, changeable character of the production volume. Changes in the determined indicators were examined in particular production periods and at monthly intervals during a calendar year. The research analysis and the conclusions formulated on its basis made it possible to put forward a proposal of measures aimed at improving the current situation and ensuring a better effectiveness of activities undertaken by maintenance teams, as well as their better co-operation with production departments.