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Maintenance & Reliability (Week 12) (Maintenance (Preventive…
Maintenance & Reliability
(Week 12)
Maintenance
Preventive maintenance
routine inspection & servicing
Problems
Fix it whether or not it's broken
Replacing old but still good equipment
Breakdown maintenance
emergency repair on failed equipment
Problems
Run it till it breaks
Could be disastrous for mission critical equipment
Predictive maintenance
need to know when a system requires service or is likely to fail
Tools
Vibration analysis
Infrared thermography
Oil & water analysis
Reliability
Improving individual component
Series reliability
System reliability, Rs = R1 x R2 x R3 x ... x Rn
Providing redundancy
Parallel reliability
R1 = 0.9, R2 = 0.95, R3 = 0.85
Rs = 0.9 + (0.1 x 0.95) + (0.1 x 0.05 x 0.85) = 0.99925 = 99.9%
E.g. 3 components in parallel