World Class Maintenance Management, Terry Wireman, Industrial Press Inc., 1990, pg. 7, 73.
This document is intended to establish recommended practice as well as to give
general advice and guidance in the maintenance of electrical equipment owned
and operated by the Bureau of Reclamation (Reclamation). Specific technical
details of maintenance are included in other documents which are referenced in
Maintenance recommendations are based on industry standards and experience in
Reclamation facilities. However, equipment and situations vary greatly, and
sound engineering and management judgment must be exercised when applying
these recommendations. Other sources of information must be consulted
(e.g., manufacturer's recommendations, unusual operating conditions, personal
experience with the equipment, etc.) in conjunction with these maintenance
Preventive maintenance (PM) is the practice of maintaining equipment on a
regular schedule based on elapsed time or meter readings. The intent of PM is to
"prevent" maintenance problems or failures before they take place by following
routine and comprehensive maintenance procedures. The goal is to achieve fewer,
shorter, and more predictable outages.
Some advantages of preventive maintenance are:
It is predictable, making budgeting, planning, and resource leveling possible.
When properly practiced, it generally prevents most major problems, thus
reducing forced outages, "reactive maintenance," and maintenance costs in
It gives managers a level of assurance that equipment is being maintained.
It is easily understood and justified.
Preventive maintenance does have some drawbacks:
It is time consuming and resource intensive.
It does not consider actual equipment condition when scheduling or performing
It can cause problems in equipment in addition to solving them (e.g., damaging
seals, stripping threads).