Turbomachinery Package Specification Taurus 70 Compressor Set and Mechanical Drive
7.3 Pneumatic Start System (Optional)
The pneumatic start system, (Figure 11) can use either process gas or compressed air as
a power source. The standard system consists of a strainer, shutoff valve, pneumatic
starter motor, and associated stainless steel piping and manifolds. The pneumatic starter
motor is mounted directly on the gas turbine accessory drive gearbox and transmits
starting power to the gas turbine via an overrunning clutch and shaft. When the gas
turbine reaches starter dropout speed, the start system is de-energized and the clutch
overruns.
Figure 11. Typical Pneumatic Start System
Table 7. Pneumatic Start System Specifications
Pneumatic Start Motor
Fluid Air or Natural Gas See Note (a)
Pressure 1379 to 2758 kPag (200 to 400 psig)
Flow 127 nm
3
/min (4500 SCFM)
4 Minute Exhaust Purge Consumption 325 nm
3
(11,500 SCF)
Solar’s Applicable Engineering Specifications
ES 2201 Auxiliary Service Air
Notes:
(a) The particle size in the air stream should not exceed 10μ. Since it is impractical to remove
100% of all particles larger than 10μ, this is defined as ß10 > 100, or 99% efficient. Oil or
hydrocarbon content should not exceed 1 ppm. The dew point at line pressure shall be at
least 6°C (10°F) below the minimum temperature to which any part of the air system is
exposed or between -29°C and 93°C (-20°F and 200°F). Air should be free of all corrosive
contaminants, hazardous gases, flammables, and toxics.
© 2009 Solar Turbines Incorporated. All rights reserved. TPS70CSMD/309
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