Quantcast Scheduling - mo2010185

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Emergency lighting.
Emergency power.
Fire alarm systems.
Fire pumps.
Certain communication systems.
There are also parts of a system that are critical because of the function of the utilization
equipment and its associated hardware. An example of this is the safety combustion controls on
a large boiler, whose failure may cause a serious explosion. Parts of the electrical system, such
as overcurrent devices or automatic transfer switches, are critical, because they reduce the
widespread effect of a fault in the electrical equipment. Alarm and shutdown systems are often
critical, because they monitor the process and automatically take action to prevent a catastrophe
and alert operating personnel to dangerous or out-of-control conditions. Scheduling. The proper scheduling of routine inspections and tests is the core of
an effective EPM program. They will determine the condition of electrical equipment, allow
determination of what maintenance is required, and verify that equipment will continue to
function until the next scheduled maintenance period. Factors that need consideration in the
preparation of a proper schedule are:
(a) Atmosphere or environment that the electrical equipment is located in (i.e., air
contaminant content, moisture, dust, hazardous vapors, chemicals, exposure to high ambient
temperatures and humidity.
(b) Load conditions (i.e., continuous-, intermittent-, periodic-, varying-, or short-time
duty cycles, running time, number of starts, operating overloaded.
(c) History of equipment, which is used to develop repair cost trends, items replaced,
design changes or modifications, significant trouble or failure patterns, and the stocking of
(d) Inspection frequency, as determined by equipment criticality, manufacturers'
servicing recommendations, operating duty, environmental severity, history or lack of prior
trouble. Methods and Procedures. Methods and procedures for an effective EPM program
must include not only the individual components of the electrical system, but the connections
between those components. Neglecting the system's interconnections and operation together can
cause unanticipated problems to occur. Although the manufacturer may have provided testing
and calibrating procedures documentation for individual components, the application is often
unique; therefore system peculiar inspection and testing procedures should be developed. The
system procedures should contain:


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