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284 Gas Turbine Handbook: Principles and Practices
Figure 18-3. Courtesy of Capstone Turbine Corp. Schematic cross-section
of the ISO base load 24 kilowatt turbogenerator. This unit, configured
with the centrifugal compressor and turbine wheels mounted
on the same shaft as the electric generator, weights 165 pounds.
and assembly. A typical gas turbine, over 1 megawatt, has over 4000
parts. About one third of these parts are made from exotic materials that
incur high development cost. Each of the 4000 parts must be handled
several times from initial machining to final installation. Maintaining
this machine is every bit as complicated, requiring the same technical
skills, as building a new unit.
Producing the blade and disc assembly, as a single part will