meljun cortes - operations management 14th - 14a lecture (maintenance)

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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MBA,MPA,BSCS,ACS

H

APTER

14s

Maintenance

MELJUNELJUN


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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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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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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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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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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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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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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?

meljun cortes - operations management 14th - 14a lecture (maintenance)

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