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Page | 033 Fig. 46. Siemens gas turbine power plants range from 65 MW to 814 MW (simple cycle and
combined cycle. Power output according to applied turbine and plant type. (Source: Siemens Westinghouse)
Several gas turbines have dual frequency capability. A dual frequency power generation package is illustrated in Figure 47.
Siemens’ SGT-200 Industrial Gas Turbine for Power Generation
(ISO) 6.75MW (e) Power Generation Package is of light modular
construction, 50Hz or 60Hz, and suitable for small power
generation, especially in locations where power to weight ratio is
important (offshore applications) and small footprint is required.
The SGT-200 is available as a factory assembled packaged
power plant for utility and industrial power generation
applications. It incorporates the gas turbine, gearbox, generator
and all systems mounted on a base. The package is available for
either multi-point or three-point mounting for onshore or offshore
use as required. An option for acoustic treatment reduces noise
levels to 80dB (A) and is available in carbon steel and stainless
steel. Doors and panels are incorporated to provide access for
servicing.
Fig. 47. SGT-200 Modular Package - Generator Set.
(Source: Siemens Westinghouse)
The cases below include an illustration of a similar rotor [Mitsubishi Heavy Industries, MHI]5, shape using different metallurgy,
aerodynamic (including bleed air modifications) or cooling techniques to increase the power developed by that rotor. To increase
compressor discharge pressure (and therefore mass of compressor air delivered and in turn power developed by the turbine), additional
compressor stages can be added to give higher compression ratios. This can be done while leaving the core diameter the same.
Note 5: See footnote on page 38
The After-Sales Market
Generally, much of an OEM’s revenue is made from the sale of new or reconditioned spare parts. End users exert pressure on OEMs
to optimize component designs and thus reduce their operational cost per fired hour.
Therefore, design development that perfects component design within economically practical limits and develops repairability
strategies, is continual. Design development also aims at offering a larger power range with models that have essentially the same core
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