17.8 Key Terms
Key Terms
- Condition-Based Maintenance (CBM) is a specialized form of predictive maintenance that triggers maintenance actions only when specific measured conditions (e.g., temperature, vibration, pressure) exceed predefined thresholds.
- Failure rate Percentage (%) expresses the proportion of failed units relative to the total number tested, typically over a defined time period.
- Failure Rate represents the rate at which a product or system fails over time.
- Maintenance encompasses all activities aimed at keeping equipment and systems in working order.
- Mean time between failure (MTBF) applies to repairable systems and measures the average time between successive failures, including the time taken for fault diagnosis and repair.
- Mean time to failure (MTTF) is used for non-repairable items to represent the average time until failure.
- Predictive maintenance uses real-time monitoring, data analytics, and diagnostic tools to predict when equipment is likely to fail.
- Preventive maintenance involves performing scheduled inspections, servicing, and part replacements at predetermined intervals—either time-based (e.g., monthly) or usage-based (e.g., after 1,000 operating hours).
- Reactive maintenance involves taking corrective action only after an equipment failure or a defect has been detected.
- Redundancy refers to the inclusion of additional or backup components in a system to enhance its overall reliability.
- Reliability is a measure of how consistently a system, product, or service performs its intended function without failure over a specified time period.
- Reliability-Centred Maintenance (RCM) is a comprehensive strategy that integrates multiple maintenance approaches to optimize asset performance based on criticality, failure modes, and operational context.
- Reliability metrics help evaluate performance, identify areas for improvement, and guide design and maintenance decisions.
- Risk-Based Maintenance (RBM) prioritizes maintenance activities based on the risk associated with asset failure, considering both the likelihood and consequences of failure.
- System typically comprises multiple subsystems, each made up of individual components.
- System reliability refers to the likelihood that an entire system will function without failure over a specified period.
