5)maintenance - final
TRANSCRIPT
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14s-1 Maintenance
Operations Management
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14s-2 Maintenance
CHAPTER
Maintenance
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14s-3 Maintenance
Introduction
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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14s-4 Maintenance
Reasons for keeping equipment running Avoid production disruptions
Not add to production costs
Maintain high quality Avoid missed delivery dates
Maintenance Reasons
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14s-5 Maintenance
Production capacity is reduced Orders are delayed
No production
Overhead continues
Cost per unit increases
Quality issues
Product may be damaged
Safety issues
Injury to employees
Injury to customers
Breakdown Consequences
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14s-6 Maintenance
Total Maintenance Cost
Breakdown and
repair cost
Optimum Amount of
preventive maintenance
Cost
Total Cost
Preventive
maintenance cost
Table 14S.1
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14s-7 Maintenance
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 Maintenance
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14s-8 Maintenance
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-1
Number of breakdowns 0 1 2 3
Frequency of occurrence .20 .30 .40 .10
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14s-9 Maintenance
Number ofBreakdowns Frequency ofOccurrence Expected number ofBreakdowns
0
1
2
3
.20
.30
.40
.10
1.00
0
.30
.80
.30
1.40
Expected cost to repair = 1.4 breakdowns per month X $1000 = $1400Preventive maintenance = $1250PM results in savings of $150 per month
Example S-1 Solution
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14s-10 Maintenance
Predictive 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
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14s-11 Maintenance
Breakdown 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
14 12 M i
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14s-12 Maintenance
Replacement
Trade-off decisions
Cost of replacement vs cost of continuedmaintenance
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 newequipment capacity
When is it time for replacement?
14 13 M i
M i t M t
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14s-13 MaintenanceMaintenance ManagementTotal Productive Maintenance (TPM)
Philosophy for all workers of enterprise Involve all departments
Involve everyone
Prevent all types of losses
Maximize effectiveness of production
systems