General Electric LM2500

The General Electric LM2500 is an industrial and marine gas turbine produced by GE Aviation. The LM2500 is a derivative of the General Electric CF6 aircraft engine.

LM2500
An LM2500 on USS Ford (FFG-54)
Type Aeroderivative gas turbine
National origin United States
Manufacturer General Electric
First run 1960s
Developed from General Electric CF6

As of 2004, the U.S. Navy and at least 29 other navies had used a total of more than one thousand LM2500/LM2500+ gas turbines to power warships.[1] Other uses include hydrofoils, hovercraft and fast ferries.

In 2012, GE developed an FPSO version to serve the oil and gas industry's demand for a lighter, more compact version to generate electricity and drive compressors to send natural gas through pipelines.[2]

Design and development
A heavy lift lowers the main propulsion module into the hull of USS Bunker Hill (CG-52) during construction at Ingalls Shipbuilding. The module consists of two General Electric LM2500 gas turbine engines and a Westinghouse gear reduction unit.

The LM2500 was first used on the US Navy GTS Admiral W. M. Callaghan in 1969, after the original FT-4 gas turbines experienced many technical problems.[3] Later, they were used in US Navy warships in the Spruance class of destroyers and the related Kidd class, which were constructed from 1970. In this configuration it was rated to 21,500 shp (16,000 kW). This configuration was subsequently used into the 1980s in the Oliver Hazard Perry-class frigates, and Ticonderoga-class cruisers. It was also used by one of People's Republic of China's Type 052 Luhu Class Missile Destroyer (Harbin 112) acquired before the embargo.

The LM2500 was uprated to 26,500 shp (19,800 kW) for the Arleigh Burke-class destroyers, which were initiated in the 1980s and started to see service in the early 1990s, and the T-AOE-6 class of fast combat tanker.

In 2001 the LM2500 (20 MW) was installed in a sound-proof capsule in the South African Navy Valour class (Meko A-200 SAN) frigates as part of a CODAG propulsion system with two MTU 16V 1163 TB93 Propulsion Diesels.

The current generation was uprated in the late 1990s to over 30,000 shp (22,000 kW).

LM2500 installations place the engine inside a metal container for sound and heat isolation from the rest of the machinery spaces. This container is very near the size of a standard 40-foot (12 m) intermodal shipping container – but not the same, the engine size very slightly exceeds those dimensions. The air intake ducting may be designed and shaped appropriately for easy removal of the LM2500 from their ships.

The LM2500+ is an evolution of the LM2500, delivering up to 40,200 shp (30,000 kW) or 28.6 MW of electric energy when combined with an electrical generator. Two of such turbo-generators have been installed in the superstructure near the funnel of Queen Mary 2, the world's largest transatlantic ocean liner, for additional electric energy when the ship's four diesel-generators are working at maximum capacity or fail. Celebrity Cruises uses two LM2500+ engines in their Millennium-class cruise ships in a COGAS cycle.

The LM2500 is license-built in Japan by IHI Corporation,[4] in India by Hindustan Aeronautics Limited,[5] and in Italy by Avio Aero.

The LM2500/LM2500+ can often be found as turbine part of CODAG, CODOG, CODLAG propulsion systems or in pairs as powerplants for COGAG systems.

Applications

Aircraft carrier:

Amphibious assault ship:

Cruiser:

Destroyer:

Frigate:

Fast Combat Support Ship:

Maritime Prepositioning Force:

Littoral combat ship:

Corvette:

Maritime Security Cutter, Large:

Fast Attack Patrol boat

Variants

The LM2500 is available in 3 different versions:

  • The LM2500 delivers 33,600 shp (25,100 kW) with a thermal efficiency of 37 percent at ISO conditions. When coupled with an electric generator, it delivers 24 MW of electricity at 60 Hz with a thermal efficiency of 36 percent at ISO conditions.[7]
  • The improved, 3rd generation, LM2500+ version of the turbine delivers 40,500 shp (30,200 kW) with a thermal efficiency of 39 percent at ISO conditions. When coupled with an electric generator, it delivers 29 MW of electricity at 60 Hz with a thermal efficiency of 38 percent at ISO conditions.[8][9]
  • The latest, 4th generation, LM2500+G4 version was introduced in November 2005 and delivers 47,370 shp (35,320 kW) with a thermal efficiency of 39.3 percent at ISO conditions.[10]

Derivatives
  • The GE TM2500 is derived from the LM2500, and mounted on a trailer that makes it possible to move it to wherever 30 MW of temporary electricity generation is required.[11] It can be installed and commissioned in 11 days.[12]

Specification

The basic LM2500 has a single shaft gas generator derived from the CF6, comprising a 16 stage compressor driven by a two stage air-cooled HP turbine. The combustion chamber is annular. Shaft power is generated by a 6-stage power turbine mounted in the gas generator exhaust stream Additional power is obtained from the LM2500+ by the addition of a zero stage to the compressor, making 17 stages in all. Specifications for three models of LM2500 series gas turbine engines:

LM 2500 series gas turbine engines specifications
Performance Category LM2500[13][14][15] LM2500+[16][17][15] LM2500+G4[18][19][15]
Output 33,600 shp (25,060 kW) 40,500 shp (30,200 kW) 47,370 shp (35,320 kW)
Fuel consumption 0.373 lb/shp-hr (227 g/kW-hr) 0.354 lb/shp-hr (215 g/kW-hr) 0.325 lb/shp-hr (214 g/kW-hr)
Heat rate 6,860 Btu/shp-hr (9,705 kJ/kW-hr) 6,522 Btu/shp-hr (9,227 kJ/kW-hr) 6,469 Btu/shp-hr (9,150 kJ/kW-hr)
Exhaust gas flow 155 lb/s (70.5 kg/s) 189 lb/s (85.9 kg/s) 205 lb/s (93 kg/s)
Exhaust gas temperature 1,051°F (566°C) 965°F (518°C) 1,020°F (549°C)
Turbine speed (rpm) 3,600 3,600 3,600
Thermal efficiency 36% 38% 39%
Weight 4.7 ton 5.25 ton 5.25 ton

See also

Related development

Comparable engines

Related lists

References
  1. "GE Marine to Supply IHI with LM2500 Gas Turbines to Power Japan's 15DDG AEGIS Destroyer" (Press release). GE Aviation. 6 May 2004. Archived from the original on 17 October 2006.
  2. "From aircraft to blowout preventer, GE's global technology cross-pollinates". World Oil Online. 10 September 2012. Archived from the original on 14 March 2014. Retrieved 10 September 2012.
  3. "GTS Admiral W.M. Callaghan | MARAD". www.maritime.dot.gov. Retrieved 11 August 2020.
  4. "GE to Provide IHI with LM2500 and LM500 Gas Turbines for Japan's New 24DDH Destroyer; IHI/GE Celebrate Milestone | GE Aviation". www.geaviation.com. Retrieved 29 July 2022.
  5. GE Marine Solutions Military page
  6. "'GE Marine has Long Been a Trusted Supplier to the Turkish Naval Forces!'".
  7. "LM2500 Marine Gas Turbine Data Sheet" (PDF). GE Aviation. Archived from the original (PDF) on 15 September 2012. Retrieved 4 January 2014.
  8. "LM2500+ Marine Gas Turbine Data Sheet" (PDF). GE Aviation. Archived from the original on 29 July 2012.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  9. Ramsdal, Roald (27 October 2014). "På disse plattformene fyrer de minst for måkene". Teknisk Ukeblad. Archived from the original on 28 October 2014.
  10. "LM2500+G4 Marine Gas Turbine Data Sheet" (PDF). GE Aviation. Archived from the original (PDF) on 14 March 2014. Retrieved 27 July 2012.
  11. "GE TM2500 Gas Turbine". VBR Turbine Partners. Retrieved 30 August 2019.
  12. "Mobile Aeroderivative Gas Turbine TM2500". general Electric. Retrieved 30 August 2019.
  13. "LM2500". Archived from the original on 13 May 2016. Retrieved 16 May 2016.
  14. "LM2500 engine" (PDF). Archived (PDF) from the original on 22 October 2016. Retrieved 16 May 2016.
  15. "LM2500 series gas turbine engine". Archived from the original on 25 March 2016. Retrieved 16 May 2016.
  16. "LM2500+". Archived from the original on 14 May 2016. Retrieved 16 May 2016.
  17. "LM2500+ engine" (PDF). Archived (PDF) from the original on 22 October 2016. Retrieved 16 May 2016.
  18. "LM2500+G4". Archived from the original on 14 May 2016. Retrieved 16 May 2016.
  19. "LM2500+G4 engine" (PDF). Archived (PDF) from the original on 10 January 2017. Retrieved 16 May 2016.
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