Page 59 - Intro Predictive Maintenance
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50 An Introduction to Predictive Maintenance
preventive maintenance tasks. This access will be required more often than
it is with breakdown-driven maintenance. A good program requires the
support of production, with immediate notification of any potential prob-
lems and willingness to coordinate equipment availability for inspections
and necessary tasks.
The reasons for and against doing preventive maintenance are summarized in the fol-
lowing list. The disadvantages are most pronounced with fixed-interval maintenance
tasks. Reactive and condition-monitoring tasks both emphasize the positive and reduce
the negatives.
Advantages
• Performed when convenient
• Increases equipment uptime
• Creates maximum production revenue
• Standardizes procedures, times, and costs
• Minimizes parts inventory
• Cuts overtime
• Balances workload
• Reduces need for standby equipment
• Improves safety and pollution control
• Facilitates packaging tasks and contracts
• Schedules resources on hand
• Stimulates pre-action instead of reaction
• Indicates support to user
• Assures consistent quality
• Promotes benefit/cost optimization
Disadvantages
• Exposes equipment to possible damage
• Failures in new parts
• Uses more parts
• Increases initial costs
• Requires more frequent access to equipment
3.3 DESIGNING A PREDICTIVE MAINTENANCE PROGRAM
An effective predictive maintenance program must include both condition-driven and
time-driven tasks. These tasks are determined by the specific equipment and systems
that constitute the plant. At a minimum, each plant should evalute:
• Failure data
• Improving equipment reliability
• Improvement process
