Glossary of Terms
Practical maintenance terms, CMMS language, reliability abbreviations, and plant maintenance definitions in one place.
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399 terms shown
Parts Return
A parts return is the controlled inventory transaction used when unused or recoverable material is returned from a maintenance job to stock or another defined disposition.
Performance Qualification
Performance Qualification documents that equipment or a system consistently performs effectively under actual or representative operating conditions.
Performance Rate
Performance rate is the OEE component measuring how quickly equipment runs compared with its defined ideal production rate.
Permanent Repair
A permanent repair is a completed restoration intended to return equipment to an approved long-term condition without relying on temporary controls.
Permit to Work
A permit to work is a formal authorization confirming that defined hazards, isolations, precautions, responsibilities, and validity conditions are controlled before high-risk work begins.
Planned Downtime
Planned downtime is an approved period when equipment is intentionally unavailable for maintenance, inspection, setup, modification, cleaning, or other scheduled work.
Planned Maintenance
Planned maintenance is work whose scope, labor, parts, tools, safety requirements, and execution method are prepared before the job begins.
Planned Maintenance Percentage
Planned maintenance percentage is the share of total maintenance labor hours spent on work that was prepared before execution.
Planned-to-Unplanned Work Ratio
The Planned-to-Unplanned Work Ratio compares planned maintenance effort with work that begins without sufficient preparation.
Polarization Index
Polarization Index is the ratio of insulation resistance measured after ten minutes to the resistance measured after one minute during a timed insulation test.
Potential Failure
A potential failure is an identifiable condition showing that an asset is beginning to deteriorate and may progress toward functional failure.
Power Quality Monitoring
Power quality monitoring measures electrical supply conditions that may affect equipment performance, reliability, efficiency, and protection.
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