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General Electric LM2500

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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.

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.<ref>Template:Cite press release</ref> 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.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Design and developmentEdit

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File:USS Bunker Hill (CG-52) LM2500 modules.jpg
A heavy lift lowers the main propulsion module into the hull of Template:USS 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 Template:Ship in 1969, after the original FT-4 gas turbines experienced many technical problems.<ref name=":0">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Later, they were used in US Navy warships in the Template:Sclass of destroyers and the related Template:Sclass, which were constructed from 1970. In this configuration it was rated to Template:Convert. This configuration was subsequently used into the 1980s in the Template:Sclasss, and Template:Sclasss. 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 Template:Convert for the Template:Sclasss, 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 Template:Sclass (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 Template:Convert.

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 Template:Convert 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 Template:Convert 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 for the liner to reach higher sea speeds.. Celebrity Cruises uses two LM2500+ engines in their Template:Sclasss in a COGAS cycle (actually COGES, as the turbines generate electricity rather than driving the shafts directly).

The LM2500 is license-built in India by Hindustan Aeronautics Limited;<ref>GE Marine Solutions Military pageTemplate:Dead link</ref> in Italy by Avio Aero;Template:Citation needed and in Japan by IHI Corporation.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> (Subsequent to the February 2024 reporting of an IHI company whistleblower;<ref>Template:Cite news</ref> On April 24, 2024, IHI announced that investigation was underway by Japan's Ministry of Land, Infrastructure, Transport and Tourism of its subsidiary, IHI Power Systems Co., which had falsified its engine data since 2003, impacting over 4,000 engines globally.<ref>Template:Cite news</ref>)

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

ApplicationsEdit

Aircraft carrier:

Amphibious assault ship:

Cruiser:

Destroyer:

Frigate:

|CitationClass=web }}</ref> Fast Combat Support Ship:

Maritime Prepositioning Force:

Littoral combat ship:

Corvette:

Maritime Security Cutter, Large:

Fast Attack Patrol boat

Passenger Ship:

VariantsEdit

The LM2500 is available in 3 different versions:

  • The LM2500 delivers Template:Cvt 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.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

  • The improved, 3rd generation, LM2500+ version of the turbine delivers Template:Cvt 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.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

  • 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.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

DerivativesEdit

  • 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.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref> It can be installed and commissioned in 11 days.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

SpecificationEdit

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<ref name=LM2500a>{{#invoke:citation/CS1|citation CitationClass=web

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LM2500+<ref name=LM2500c>{{#invoke:citation/CS1|citation CitationClass=web

}}</ref><ref name=LM2500d>{{#invoke:citation/CS1|citation

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LM2500+G4<ref name=LM2500e>{{#invoke:citation/CS1|citation CitationClass=web

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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) 0.352 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 alsoEdit

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ReferencesEdit

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External linksEdit

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Template:General Electric aeroengines Template:Aero-derivative engines

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