The modern gas turbine power plant is considerably more than a grouping of equipment assembled to perform a function. It is a complex integration of sub-systems and components which must work together reliably if high availability is to be achieved. Even the most reliable equipment, however, requires periodic or scheduled maintenance and also requires unscheduled maintenance (i.e., forced outage) as functional failures occur. Since availability is directly influenced by maintenance downtime, it is essential that power plants be designed with maintainability as a key consideration. Provisions can be readily designed into equipment which can reduce the lengths of outages, permit outages to be deferred, or to enable certain types of outages to be avoided altogether. Other provisions can be made to avoid operating and maintenance errors, and to effect faster and more accurate problem diagnosis. It is also possible to improve the availability of existing equipment by the incorporation of maintenance measures proposed in this paper.

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