Abstract
The preventive maintenance is roughly divided into two categories by the nature of informations it uses for the system reliability predictions. The one is based on the statistical informations or data of reliability as a group of systems, and the other on the measured or monitored informations of the performance directly obtained from each individual system. Let us call the former SPM for short, and the latter MPM.A reliability model is formulated for a case when MPM is applied to an elementary system, in which the detectable pre-failure defects are assumed to occur. Some conceptual features of MPM are thus analysed, and it is now possible to compare the merits of both types of PMs quantitatively under certain assumptions. Manpower ratio, reliability increment ratio, and maintenance cost ratio are defined and calculated for comparison, and the superiority of MPM is noticed.In the Marine machinery field, there are increasing needs and the trend of developing MPM are recognized. However, the merits of MPM are not always self-evident, because the conditions of the maintenance on board are rather complicated. The present author believes that such a quantitative analysis as proposed herein will help to clarify the situations on board, and give a rational basis for promoting the developments of MPM.
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