008 Maintainability Theory
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Transcript of 008 Maintainability Theory
Maintainability Maintainability Theory IITheory II
Jang Jusu
MOASOFT Training Course for Reliability
Maintenance Vs. Maintainability-Maintenance is the act of repairing or servicing equipments
-Maintainability is a design parameter intended to minimize repair time.
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MOASOFT Training Course for Reliability
Downtime
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MOASOFT Training Course for Reliability
Maintainability CriterionMaintainability Criterion
Criterion-1 Availability is a critical parameter?Criterion-2 Availability is not a critical parameter!Criterion-3 Maintenance time is unknown!!!
Criterion-4
Right hand skewness is expected :-simple equipment-simple maintenance concepts-comprehensive diagnostic routines
Criterion-5 Lognormal or skewed right hand
Criterion-6 Environmental or operational circumstances limit maintenance time
Criterion-7 Human resources allocation and planning have overriding priority
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MOASOFT Training Course for Reliability
Criterion
Measure
Mct or Mpt Mct M(max)
MMH/OH
Mct and Mct(Max)Mpt and Mpt(Max)
Mct and M(max)
C-1C-1 XXXXXX
XX XX
C-2 XX
X X X
C-3C-3 XX XX XX
C-4 X X
C-5C-5 XX XX XX XX
C-6 X X X X
C-7C-7 XX
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Maintainability CriterionMaintainability Criterion
MOASOFT Training Course for Reliability
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System Effectiveness : AvailabilitySystem Effectiveness : Availability
MOASOFT Training Course for Reliability
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System Effectiveness : DependabilitySystem Effectiveness : DependabilityDependability can be described as the probability that a
system will accomplish its assigned mission.
D = OM(1 – OR) + OR
-OM : Operational Maintainability-OR : Operational Reliability
MOASOFT Training Course for Reliability
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Maintenance Model – Maintenance Model – Optimum Number of InspectionsOptimum Number of Inspections
xTkTxT CMT
PMTDT
2/1
PMT
CMToptimal T
Tkx
MOASOFT Training Course for Reliability
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Maintenance Model – Maintenance Model – Optimum replacement time interval(year)Optimum replacement time interval(year)
)(21
PYPYFYFYT MCOCxxICMCOCC
2/12
PYPY
optimal MCOCICx
MOASOFT Training Course for Reliability
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Maintenance Model – Maintenance Model – Optimum replacement time interval(hour)Optimum replacement time interval(hour)
x
dxxCCC
x
MRPM
T
0
)(
2/12
PYPY
optimal MCOCICx
MOASOFT Training Course for Reliability
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MOASOFT Training Course for Reliability
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