KPI Familiarisation - Plant Maintenance Resource Center

MTBFMean Time Between Failure• The average amount of operating time between consecutive breakdowns for anitem of equipment (or plant).FormulaMTBF =Operating TimeNumber of Failures or Breakdown Events– Operating time is productive time plus production delays.– Number of failures or breakdown events is the number of failures on an item of equipment (orplant).• Maintenance effort required is decreasing.• Maintenance practices / mechanisms are effective.• Failure frequency is decreasing.• Operating conditions are improving.InterpretationMTBF MTBF• Maintenance effort required is increasing.• Maintenance practices / mechanisms are ineffective.• Failure frequency is increasing.• Operating conditions are deteriorating.