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Maintenance strategies in industrial and engineering systems can broadly be classified into two major categories: planned maintenance and unplanned maintenance. Planned maintenance refers to systematic, scheduled actions intended to prevent equipment failures or to ensure optimal performance, whereas unplanned maintenance occurs reactively, addressing breakdowns or faults after they have occurred. Within these broad categories, several specific strategies are employed based on the nature of equipment, cost considerations, and operational criticality. Under planned maintenance, preventive maintenance (PM) is a widely used strategy. It involves routine, time-based inspections, servicing, or part replacements to prevent failures before they occur. The central theme of preventive maintenance is risk reduction through scheduled interventions, often guided by manufacturer recommendations or historical failure data. This strategy reduces unexpected downtime but may involve replacing components that __________ _______ _________ ____ ________ _____ ________ ____ __________ ______ ____.
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