Transcript 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
System Reliability Components in Series
Reliability of the System (Percent)
100
n=1
80
60
40
20
0
100
99
98
97
Average Reliability of all Components (Percent)
96
System Reliability
Rs=R1*R2*R3*…*Rn
Where,
Rs = System reliability
Ri= reliability of component i
Reliability Tactics
improving individual components
 providing redundancy

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

Mean Time Between
Failures (MTBF)
FR(N) = number of failures during a
period of time
 MTBF=1/FR(N)

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
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