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26 Gas Turbine Handbook: Principles and Practices
component (compressor, combustor, or turbine) and replacement with
a like kind without removing the engine from its support mounts.
Some variations exist among the aero-derivative units in the method
of removing and replacing a particular module. Still, the principle of
modular replacement is common in most currently produced aeroderivative
gas turbines. As a result, the effort to remove and replace
a compressor module is not significantly different from the effort to
remove and replace a turbine module.
The heavy industrial units, by contrast, require the least
amount of effort to remove and replace the combustor parts, more
effort to inspect or repair the turbine section, and the most effort to
inspect or repair the compressor section.
The flexibility of the aero-derivative unit is “weight” and “size”
related. For example, an application convenient to a large source of
experienced manpower (with a well-defined baseload requirement,
and good quality fuel) is considerably different from an application in
a remote environment (away from skilled labor, good roads, and subject
to varying qualities of fuel and loading conditions). The user must
weigh his needs and requirements against the variety of machines
offered. The preference has been to place the aero-derivative units in
Figure 3-4. Courtesy of United Technologies Corporation, Pratt &
Whitney Canada. Exploded view of the modules that make up the
FT8 aero-derivative gas turbine.