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Maintenance and Reliability

Maintenance and Reliability. Ross L. Fink. Maintenance. All activities involved in keeping a system’s equipment in working order. Reliability. The probability that a machine part or product will function properly for a specified time under stated conditions.

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Maintenance and Reliability

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  1. Maintenance and Reliability Ross L. Fink

  2. Maintenance • All activities involved in keeping a system’s equipment in working order

  3. Reliability • The probability that a machine part or product will function properly for a specified time under stated conditions

  4. System Reliability - Components in Series 100 80 60 40 20 0 n=1 n=10 Reliability of the System (Percent) n=50 n=100 n=300 n=400 n=200 100 99 98 97 96 Average Reliability of all Components (Percent)

  5. System Reliability • Rs=R1*R2*R3*…*Rn • Where, • Rs = System reliability • Ri= reliability of component i

  6. Reliability Tactics • improving individual components • providing redundancy

  7. Redundancy • The use of components in parallel to raise reliabilities • Example, what is the effective reliability of two components used in parallel with reliability of .90? • =.90 + (1-.90)*.90)=.99

  8. Mean Time Between Failures (MTBF) • FR(N) = number of failures during a period of time • MTBF=1/FR(N)

  9. Maintenance • Preventive Maintenance • A plan that involves routine inspections, servicing, and keeping facilities in good repair to prevent failure • Breakdown Maintenance • Remedial maintenance that occurs when equipment fails and must be repaired on an emergency or priority basis

  10. Total Productive Maintenance • TQM applied to Maintenance • Components • Predictive maintenance • Cleaning the machines • Creating standards on the equipment for cleaning, lubrication, and daily checks • Collecting data on downtime • Creating equipment improvement teams • Creating TPM area coordinators

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