maintenance vs maintanability
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Maintenance Vs Maintainability
What is maintenance?
measures taken by the users of a product tokeep it in a operable condition or repair it to aoperable condition
Maintenance is the act of repairing or servicing
equipment
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Maintenance Excellence
Task Coupling alignment
Standards Align motor coupling using
dial gauge or laser method. Straight edge
method is unacceptable
Required best practices
Check the run out of shaft and coupling.Align to equipment specifications and not
to coupling specifications
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Best Maintenance Practices
Indicators of best maintenance practices
* Maintenance persons time covered byWO
* WO generated as a result of PM
* Planned / scheduled work compliances
* Reliability level reached
* Spare parts stock outs
* Overtime to total maintenance time
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Maintenance Excellence
Management Support and measures of effectiveness
Equipment data base
Maintenance tasks and procedures
Maintenance planning and procedures
CMMS
Failure evaluation / continuous Improvement
Personnel skills
Maintenance organization / structure
Work control
Shop stores inventory
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Maintenance Vs Maintainability
What is maintainability ?
Measures taken during the design and
development of a product to include features
that will enhance the ease of maintenanceand will ensure that when used in the field
the product will have minimum down time
and life cycle support cost
Design parameter intended to minimize repair time
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Maintainability
Product Life Cycle Consists with
1. Concept Development Phase
2. Validation Phase
3. Production Phase
4. Operation Phase
1 & 2 Come under Design Process
3 Come under Manufacturing Process
4 Field use
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Downtime of an equipment
Administrative time
Preparation of plans, etc.
Logistic timeWaiting for equipment, etc.
Active repair time
Put in to working condition, testing, etc.
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Active repair time
Failure verification time
Fault location time
Preparation time Part acquisition time
Repair time
Final test time
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Features of maintainability
Increase its serviceability
Increase its reparability
Increase the cost effectiveness ofmaintenance
Product meet the requirements for its
intended use
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Maintainability measures
Mean Time To Repair MTTR
Mean Preventive Maintenance Time
Median Corrective Maintenance Time Maximum Corrective Maintenance Time
Mean Maintenance Down Time
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Maintainability Tools
Failure Mode, Effects and Criticality Analysis FMECA
Structured qualitative analysis of a system,sub system, component or function that
highlights potential failure modes, their
causes and the effects of a failure on system
operation
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Basic steps of FMECA
Understanding system parts operation andmission
Defining each item expected to be
analyzed Identify possible failure mode of each item
Determining the effects of each items
failure for every possible failure mode Identifying methods/procedures for
detecting potential failures
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Maintainability Tools
Fault Tree Analysis FTA
Defines an undesirable state of the system
or product and then analyzes the system orproduct in terms of its operation and
environment, to determine all possible ways
in which the undesirable event can occur.
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Fault Tree Analysis
1. An output fault event occurs if one or
more of the m input fault events occur.
Signify by OR gate logic symbol
2. The output fault event only occurs if all
the m input fault events occur.
Signify by AND gate logic symbol
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Basic steps of FTA
1. Establish the top level fault event
2. Use FTA logic and event symbols and apply
deductive reasoning to identify what could
cause the top level fault event to occur.3. Develop the fall tree to the desired lowest
level, that of the most basic fault events
4. Analyze the completed fault tree qualitativelyand quantitatively.
5. Identify the appropriate corrective measures
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Important consideration of
maintainability design
Interchangeability any component can be
replaced with any similar component
Modularization division of a system or product
in to physically and functionally distinct units toallow removal and replacement
Accessibility easy access to defective
components
Standardization attainment of maximum
practical uniformity in a products design.
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Benefits of Standardization
1.Minimize the variety of parts / components
that the product or system needs
2.Maximize the use of common parts in
different products
3.Minimize the number of different models
and makes
4.Controlling and simplifying inventory and
maintenance