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THE MAINTENANCE REQUIREMENT
working environment in which the units operate and how the unit
or system might affect theoperation of the plant itself.
Identify bottlenecks that can harm the whole system or the whole
plant. Check bottlenecks with extra care and evaluate their
condition to ensure that no unforeseen
problems can threaten plant operation. the plant probably was
erected by workers having little knowledge about maintenance.
Most
plants can show horrendous examples of the effect of this lack
of knowledge. Theres no doubt that plant maintenance often can
benefit from a bit of a redesign, an option
that shouldnt be ruled out.
MAINTENANCE PROCEDURES:
Preventive maintenancethe prevention of equipment breakdowns
before they
happen. This includes inspections, adjustments, regular service
and planned
shutdowns.
Repair workrepairing equipment and troubleshooting malfunctions
in an effort
to return the equipment to its previous condition. These repairs
may be reactive
or preventive.
Improvement worksearching for better materials and improved
design changes
to facilitate equipment reliability. Repair work is often a part
of improvementwork.
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TYPES OF MAINTENANCE
current maintenance
current maintenance (also known as corrective maintenance)
involves all unscheduledactions performed as a result of system or
product failure. Basically, it is an attempt to
restore the system/product to a specified condition. The
spectrum of activities within
this level are
failure identification,
localization and isolation,
disassembly,
item removal and replacement or repair in place,
reassembly, and
checkout and condition verification.
scheduled maintenance
Scheduled maintenance utilizes a previously developed
maintenance schedule for
each machine tool. This is much like an oil change on an
automobile that takes
place every three months or 3,000 miles, whichever comes
first.
While this is a broadly practiced technique in many
manufacturing organizations,
it does possess some distinct disadvantages.
The scheduled maintenance may take place too soon, while the
machine still
operates well (15-20 percent of all components fail after a
predictable time), or it
may come too late if the machine fails before the scheduled
maintenance time.
Scheduled maintenance can be considered a part of preventive
maintenance
known as fixed-time maintenance (FTM).
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emergency maintenance
emergency maintenance encompasses activities, including
adjustments, replacement,
and basic cleanliness, that forestall machine breakdowns.
Emergency activities areprimarily condition based.
The resulting benefits of emergency maintenance are many. Some
of them are listed
below:
Safety. Machinery that is not well-maintained can become a
safety hazard.
Preventive maintenance increases the margin of safety by keeping
equipment in
top running condition. Lower cost. A modern and cost-effective
approach to preventive maintenance
shows that there is no maintenance cost optimum. However,
maintenance costs
will decrease as the costs for production losses decreases.
Obviously, no
preventive maintenance action is performed unless it is less
costly that the
resulting failure.
Extension of equipment life. Obviously, equipment that is cared
for will last
longer than equipment that is abused and neglected.
Increased equipment reliability. By performing preventive
maintenance on
equipment, a firm begins to build reliability into the equipment
by removing
routine and avoidable breakdowns.
Reduced overall maintenance. By not allowing machinery to fall
into a state of
disrepair, overall maintenance requirements are greatly
decreased.
OriGiNaLLy CreAted by-DyAna-
