USING STATISTICS TO SCHEDULE MAINTENANCE
USING STATISTICS TO SCHEDULE MAINTENANCECopyright 1999 Engineered Software, scheduling does not have to be based on "expert opinion". By carefully recording failure data, or usingfailure data from manufacturers, MAINTENANCE schedules can be economically optimized USING statistical types of MAINTENANCE will be considered1) Preventive MAINTENANCE ,2) Inspections, and3) Predictive maintenancePreventive MAINTENANCE is the standard "PM". A PM is performed to prevent failures due to wear. Examples arechanging hoses, changing belts, routine cleaning, etc. Inspections are used to reduce the impact of failures that are notcatastrophic. Consider the human body. A cancer inspection has a cost (money, time, pain and embarrassment), butthe damage created by the cancer increases with time if not treated (the cost of a failure is proportional to time).
6 0 Time Between Preventive Maintenance Actions System Cost Per Time Total Failure Preventive Maintenance Figure 3. Optimum schedule for preventive maintenance.
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