A mathematical model has been developed in order to predict the cost of repairs for batch process plant machinery in the pharmaceutical industry and thereby to determine the associated cost benefits of practising a condition-based maintenance programme. The implications of consequential costs arising from the operation of fans are compared with pumps which have stand-by facilities. The situation with gearboxes where oil condition monitoring decreases the failure rate is also examined.
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Rajan et al. (2000) studied this question.