Maintenance and Reliability Ross L Fink Maintenance q

Maintenance and Reliability Ross L. Fink

Maintenance q All activities involved in keeping a system’s equipment in working order

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

System Reliability Components in Series Reliability of the System (Percent) 100 n=1 80 n=10 60 n=5 0 40 n= 10 20 0 100 n= 40 0 n= 30 0 0 n=200 99 98 97 Average Reliability of all Components (Percent) 96

System Reliability q Rs=R 1*R 2*R 3*…*Rn q Where, q. Rs = System reliability q. Ri= reliability of component i

Reliability Tactics q improving individual components q providing redundancy

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

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

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

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