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LM2500G_PLUS.qxd 9/11/06 11:38 AM Page 1

GEMarine

LM 2500+ - 31041 LM2500+ Marine Gas Turbine

GE’s LM2500+gas turbine is based on the industry standard-settingGE LM2500 marine gas turbine. Its main features are increased power (20%) compared to the LM2500, the same high availability and reliability, and an even higher efficiency (lower SFC) than the LM2500. As in the case of the LM2500, the LM2500+’s simple modular design with itssplit compressor casing, in-place blade and vane replacement, in-place hot section maintenance and external fuel nozzles provides for easy maintenance.

Performance

Output40,500 shp (30,200 kW)

Comparing the Design of the LM2500+ to the LM2500

SFC.354 lb/shp-hr Heat rate6,522 Btu/shp-hr8,746 Btu/kWs-hr The primary difference between the two engines is the addition of one stage of compressor blades forward of the LM2500’s first stage blading which results in approximately a 20% airflow increase at full power. This “zero” stage is a wide-chord, single-piece bladed disk or blisk. The LM2500+’s stage one blades have been redesigned without mid-spandampers. The LM2500+’s 19-stage compressor has an increasedpressure ratio to 23.1:1 from 18:1 of the LM2500. Aft of the LM2500+’s compressor is the fully annular combustor withexternally mounted fuel nozzles; a two-stage air-cooled high pressure turbine which drives the compressor and the accessory drive gearbox; and a six-stage aerodynamically coupled, low pressure power turbine which is driven by the gas generator’s high energy exhaust gas flow. The increase in power warranted several design changes in the existing LM2500 power turbine. The overall flow function was increased 11% to account for the higher airflow. Stage 1 and Stage 6 blades are optimized for aerodynamic efficiency to keep the power turbine at its previously high level of efficiency. The power turbine rotor has been strengthened for the higher torque and potential energy of the LM2500+. Pre-wired, pre-piped and factory-tested for easy installation, theLM2500+module weighs just 50,600 pounds (23,000 kg) with shockmounts and 48,090 pounds (21,859 kg) without. It requires only 338 x 108 x 120 cubic inches of ship space (28.2 x 9 x 10 feet) (7.16 x 2.74 x 3.05 m). The inlet duct flow area is 57 square feet (5.35 sq m) and the exhaust flow area is 36 square feet (3.3 sq m). 9,227 kJ/kWs-hr Exhaust gas flow189 lb/sec (85.9 kg/sec) Exhaust gas temperature965°F (518°C) Power turbine speed3600 rpm
Average performance, 60 Hz, 59°F, sea level, 60% relative humidity, no inlet/exhaust losses

Max Power vs. Ambient Temperature

(losses: inlet/exhaust 4/6 inches water) LM2500+Marine Module