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Turbomachinery Package Specification Titan 250 Generator Set
4 Reduction-Drive Gearbox
4.1 General Description
The reduction-drive gearbox (Figure 5) is an industrial, epicyclic, star-gear design
selected specifically for generator set applications. The gearbox uses few moving parts,
which provides high reliability and ease of assembly and disassembly. The reduction
gearbox is designed for continuous-duty operation and reduces the output speed of the
turbine to the required operating speed of the generator. The gearbox is coupled to the
gas turbine through a balanced high-speed shaft, splined at both ends. The output shaft
is coupled to the generator through a flexible disk-type dry coupling enclosed in a
coupling guard. The design of the gearbox facilitates straight-through shafting, avoiding
offset problems and permitting engine, gear, and generator alignment from a common
base. Gear lubrication is provided by the package lube oil system.
The gearbox is designed to provide 99% reliability between major inspections and
overhauls.
Figure 5. Typical Reduction Gearbox for the Titan 250 Generator Set
Table 2. Reduction-Drive Gearbox Specifications
Approximate Weight
Gearbox 7300 kg (16,100 lb)
Output Speed
50 Hz Service 1500 rpm
60 Hz Service 1800 rpm
Inspection and Overhaul Intervals
Major Inspection Interval 30,000 hours
Overhaul Interval 100,000 hours
Compliance
American Petroleum Institute (API)
613 Compliant With Exceptions, Refer to Solar’s
Standard List of Exceptions
Ratings
American Gear Manufacturers Association
(AGMA)
In Excess of 1.10 for Generator Applications
Vibration Monitoring
Gearbox Acceleration Probe
© 2008 Solar Turbines Incorporated. All rights reserved. TPS250GS/908 - Preliminary
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