meljun cortes - operations management 14th - 14a lecture (maintenance)
TRANSCRIPT
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8/9/2019 MELJUN CORTES - Operations Management 14th - 14a Lecture (MAINTENANCE)
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,
MBA,MPA,BSCS,ACS
Operations Management
MELJUNELJUN
MELJUN CORTES,BSCS,ACS
Department of ICT
Faculty of Information
Technology
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,
MBA,MPA,BSCS,ACS
H
APTER
14s
Maintenance
MELJUNELJUN
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,
MBA,MPA,BSCS,ACS
IntroductionIntroduction
Maintenance All activities that maintain facilities and equipment in
good working order so that a system can perform as
intended
Breakdown maintenance Reactive approach; dealing with breakdowns or
problems when they occur
Preventive maintenance Proactive approach; reducing breakdowns through a
program of lubrication, adjustment, cleaning,
inspection, and replacement of worn parts
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,
MBA,MPA,BSCS,ACS
Reasons for keeping equipment running Avoid production disruptions
Not add to production costs
Maintain high quality Avoid missed delivery dates
Maintenance ReasonsMaintenance Reasons
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,
MBA,MPA,BSCS,ACS
Total Maintenance CostTotal Maintenance Cost
Breakdown and
repair cost
Optimum Amount of
preventive maintenance
Cos
t
Total Cost
Preventive
maintenance cost
Table 14S.1
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,MBA,MPA,BSCS,ACS
Preventive maintenance: goal is to reducethe incidence of breakdowns or failures in
the plant or equipment to avoid the
associated costs Preventive maintenance is periodic
Result of planned inspections
According to calendar
After predetermined number of hours
Preventive MaintenancePreventive Maintenance
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,MBA,MPA,BSCS,ACS
Frequency of breakdown
If the average cost of a breakdown is $1,000,
and the cost of preventative maintenance is$1,250 per month, should we use preventive
maintenance?
Example S-1Example S-1
Number of breakdowns 0 1 2 3
Frequency of occurrence .20 .30 .40 .10
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,MBA,MPA,BSCS,ACS
Number ofBreakdowns
Frequency ofOccurrence
Expected number ofBreakdowns
012
3
.20
.30
.40
.101.00
0.30.80
.301.40
cted cost to repair = 1.4 breakdowns per month X $1000 =cted cost to repair = 1.4 breakdowns per month X $1000 =
entive maintenance = $1250entive maintenance = $1250
esults in savings of $150 per monthsults in savings of $150 per month
Example S-1 SolutionExample S-1 Solution
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,MBA,MPA,BSCS,ACS
Predictive MaintenancePredictive Maintenance
Predictive maintenance An attempt to determine when best to perform
preventive maintenance activities
Total productive maintenance
JIT approach where workers perform
preventive maintenance on the machines they
operate
CO S
SCS CS
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MELJUN CORTES,MBA,MPA,BSCS,ACSMELJUN CORTES,MBA,MPA,BSCS,ACS
Breakdown ProgramsBreakdown Programs
Standby or backup equipment that can bequickly pressed into service
Inventories of spare parts that can be
installed as needed Operators who are able to perform minor
repairs
Repair people who are well trained andreadily available to diagnose and correct
problems with equipment
MELJUN CORTES
MBA MPA BSCS ACS
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ReplacementReplacement
Trade-off decisions Cost of replacement vs cost of continued maintenance
New equipment with new features vs maintenance
Installation of new equipment may cause disruptions
Training costs of employees on new equipment Forecasts for demand on equipment may require new
equipment capacity
When is it time for replacement?