Unit
- Asset life cycle definition: Every industrial asset progresses through phases including acquisition, commissioning, operation, maintenance, and disposal. Understanding these stages helps managers plan interventions at the optimal time and cost.
- Reactive maintenance: Also called run-to-failure, this approach performs repairs only after equipment breaks down. It carries the highest risk of unplanned downtime and secondary damage, but may be acceptable for low-criticality assets with low failure consequences.
- Preventive maintenance: Scheduled tasks performed at fixed intervals regardless of equipment condition. Examples include periodic lubrication, filter changes, and inspections. This approach reduces random failures but can result in unnecessary work if intervals are too conservative.
- Predictive maintenance: Uses condition monitoring data such as vibration, temperature, and oil analysis to perform maintenance only when indicators show developing faults. This minimizes downtime and extends component life compared to fixed schedules.
- Proactive maintenance: Focuses on identifying and eliminating root causes of failures through design changes, operating procedure improvements, and contamination control. It addresses the source rather than the symptom of problems.
- Asset lifecycle cost: Total cost of ownership includes acquisition, installation, energy, maintenance, and disposal costs. Maintenance decisions made early in the asset life significantly affect long-term expenditure.
- Criticality assessment: Classifying assets by their impact on safety, production, and cost helps prioritize maintenance efforts. High-criticality equipment typically receives more frequent and thorough maintenance attention.
- Maintenance strategy selection: No single approach fits all assets. A balanced strategy applies reactive maintenance to non-critical items, preventive maintenance to wear-out components, and predictive maintenance to high-value or failure-prone equipment.
- Reliability Centered Maintenance (RCM): A systematic framework that analyzes each asset's functions, failure modes, and consequences to determine the most effective maintenance tasks. RCM moves beyond fixed schedules by focusing on preserving system function, often leading to improved safety and reduced unnecessary maintenance.
- Total Productive Maintenance (TPM): Combines maintenance with production operations, empowering operators to perform basic care such as cleaning, lubrication, and inspections. TPM aims for zero breakdowns, zero defects, and zero accidents through autonomous maintenance, planned maintenance, and continuous improvement activities.
- Failure Mode and Effects Analysis (FMEA): A structured technique to identify potential failure modes, their causes, and effects on system performance. FMEA assigns risk priority numbers based on severity, occurrence, and detection, helping teams prioritize corrective actions for the most critical failure risks.
- Maintenance Metrics: Key performance indicators like Mean Time Between Failures (MTBF) and Mean Time To Repair (MTTR) quantify equipment reliability and maintainability. Tracking these metrics over time helps identify trends, measure improvement, and justify resource allocation for maintenance programs.
Equipment Specification
Equipment: Centrifugal Pump
- Service Life
- 10-15 years with proper maintenance
- Failure Mode
- Bearing wear, seal leakage, impeller erosion
- Recommended Strategy
- Predictive with vibration and oil analysis
- Standard
- ANSI/HI 1.6-2000
Safety Consideration
Hazard: Unexpected start-up during maintenance on rotating equipment can cause severe injury.
Mitigation: Always apply lockout-tagout procedures before any maintenance task. Verify zero energy state using a qualified technician.
Quick Revision
- Asset life cycle includes acquisition, operation, maintenance, and disposal phases.
- Maintenance types range from reactive to proactive, each with specific use cases.
- Cost of ownership strongly influences maintenance strategy selection.
- Criticality assessment guides resource allocation across the equipment fleet.
- Lockout-tagout is mandatory before any maintenance intervention on powered equipment.