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Page | 129 GAS TURBINES
synchronous generator with speed reduction gear, is a highly flexible turbo generator that can also
cover combined cycle and cogeneration applications with an electrical efficiency approaching 50%.
Design Information
Twin spool axial compressor (three stages LP compressor, seven stages HP compressor);
pressure ratio 20.1:1
Annular combustion chamber (18 fuel nozzles)
Twin spool gas generator turbine (one stage HP turbine, one stage LP turbine)
Two stages power turbine (7,900 RPM) with variable first stage nozzles
The complete gas turbine module is mounted on a single base plate
The enclosure is integrated with the base plate providing maximum accessibility for gas
turbine and auxiliaries maintenance
The standard configuration, excluding the inlet and exhaust ducts, is 27 by 8 by 12 ft (8.1 by
2.5 by 3.8 m) and weighs 19 t
Dry low emission (DLE) combustion system
Steam or water injection systems for nitrous oxide abatement
Performance Information
Generator drive, natural gas fuel
Mechanical drive, natural gas fuel
Output : 13,735 kWe
Output : 19,120 shp (14,252 kW)
Heat rate : 10,314 kJ/kWh
Heat rate : 7,020 btu/shp-h (9,939 kJ/kWh)
Exhaust flow : 47.4 kg/s
Exhaust flow: 104.5 lb/s (47.4 kg/s)
Exhaust temp : 919 °F (493 °C)
Exhaust temp: 919 °F (493 °C)
PGT25
The PGT25 gas turbine consists of an LM2500 GE aeroderivative gas generator coupled with a
rugged, industrial power turbine. The LM2500 gas generator and the PGT25 power turbine has one
of the best overall performance in the 17,000 to 31,000 HP range, with maximum efficiency above
37 percent. The speed of the output shaft, 6,500 rpm, as well as its high capacity and simplicity of
maintenance have made the PGT25 highly suitable for driving direct coupled centrifugal
compressors for pipeline service or natural gas re-injection plants. It’s light weight and high
efficiency makes it well-suited to offshore and industrial power generation. The modular design,
extended to all accessory equipment, takes into account the special requirements of platform
applications (minimum weight and overall dimensions), and drastically reduces erection time and
Training on Gas turbine Fundamentals by Sri Ajay Tripathi CM (Mech), GAIL, Pata on 23rd June 2009.
Material Compiled by: Mechanical Maint Dept GAIL Pata For discussion
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