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Reformated, September 1991
GENERAL
Operation of the combustion gas turbine, as of any rotating power equipment, must include a planned pro-
gram of periodic inspection, with accompanying repair and replacement of parts as necessary, to ensure the
maximum availability and reliability of the unit.
The object of this Maintenance Section is threefold:
1. To aid the user in becoming familiar with the unit by separating the inspections according to specific
systems and, where appropriate, describing briefly the reason for the inspection and the action to
be taken.
2. To identify those components and parts that should be periodically examined between the initial
start-up tests and the designated inspection.
3. Inspection intervals herein are based on engineering judgment and experience gained with gas turbine
units. The actual time interval established for any particular gas turbine should be based on the user's
operating experience and on ambient conditions, such as humidity, dust, and corrosive atmosphere.
Prior to scheduled inspections or taking operating data, clean the compressor per the gas turbine compressor
cleaning procedure in the Water Wash/Cleaning Tab section of Volume II. Before and after any inspection a
complete set of operating data including vibration readings should be taken and recorded for reference. A re-
cord of the inspections made, and the maintenance work performed, will be most valuable in helping to estab-
lish a good maintenance program for the gas turbine unit(s). It is expected that the maintenance program will
start with minor work, and increase in magnitude over a period of time to a major overhaul, and then repeat
the cycle. The performance of inspections can be optimized to reduce unit outage time and maintenance cost
for a particular mode of operation, and still maintain maximum availability and reliability of the unit.
Operating Factors Affecting Maintenance
Note: The effect of maintenance factors for fuel, starts and load duty are cu-
mulative if all the above factors are present. It should also be under-
stood that as the maintenance factor increases the time between in-
spections and components repairs decreases and it is possible that
component replacement frequency will increase.
Introduction
GE Power Systems
Gas Turbine
Introduction
Rev. 0 (11/98)
I–1
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