The LM2500 Gas Turbine is a high-efficiency power unit designed for use in industrial, marine, and utility applications. It’s commonly used for grid support, combined heat and power, and in mobile or remote power installations.

The turbine uses a single-rotor gas generator that can be connected to a power turbine. Inside, it includes a 16-stage compressor, an annular combustor, and a two-stage high-pressure turbine—to deliver strong performance in demanding environments.

Built for flexibility, the LM2500 is well-suited for operations that require frequent start-and-stop cycles. It can ramp up from a cold shutdown to full power in under five minutes, making it a reliable option for fast, on-demand power delivery.

Adding to its versatility, the LM2500 supports a wide range of fuels—including natural gas, diesel, aviation fuel, naphtha, LPG, ethane, ethanol, biodiesel, and more. This fuel flexibility makes it easy to integrate into different operating environments.

Its proven adaptability and performance have made the LM2500 the most widely used gas turbine in the 25–37 megawatt range.

In addition to high efficiency and reliability, the LM2500 delivers low emissions—even in challenging environments or when water availability is limited. With control system redundancy and several configuration options, it offers a customizable solution for dependable, efficient power generation.

The LM2500+ DLE 50Hz Combined Cycle 2x1 system combines two LM2500+ dry low emissions gas turbines, each coupled with a Heat Recovery Steam Generator (HRSG), to power a single steam turbine. This high-efficiency configuration is engineered to meet larger capacity needs, delivering reliable, low-emission power with rapid startup capability.

At the core of this system is the LM2500+, an uprated version of the LM2500, featuring a 17-stage compressor. The addition of a forward-stage blisk increases airflow by approximately 20% at full power. This enhancement boosts the compressor pressure ratio from 18:1 to 23.1:1, contributing to higher overall efficiency and output.

Downstream of the compressor, the engine incorporates a fully annular combustor with externally mounted fuel nozzles, a two-stage air-cooled high-pressure turbine driving the compressor and gearbox, and a six-stage low-pressure power turbine aerodynamically coupled to extract energy from the high-energy exhaust flow. To accommodate the increased output, key design changes were made to the power turbine, including aerodynamic blade optimizations and rotor strengthening.

The Dry Low Emissions (DLE) system plays a crucial role in minimizing environmental impact. Its triple annular combustor lowers flame temperature, reducing NOx and CO emissions without water or steam injection—improving both thermal efficiency and maintainability.

Together, this 2x1 configuration offers a scalable solution for utility and industrial operators seeking clean, efficient, and dependable power generation at higher capacities.

The LM2500+G4 is an advanced variant of the LM2500+ aeroderivative gas turbine, designed to provide increased output and thermal efficiency through a set of targeted design upgrades. It retains the core architecture of the LM2500+ but introduces changes to the flow path that increase overall engine performance.

The primary difference between the LM2500+G4 and the LM2500+ is the increased flow capacity in the high-pressure (HP) compressor, HP turbine, and low-pressure turbine. These modifications raise the overall pressure ratio from 23.6 to 24.2, resulting in higher thermal efficiency and greater mass flow. The design changes are relatively limited, focusing mainly on minor geometry adjustments to blades and vanes to accommodate the increased flow.

In the high-pressure turbine, the G4 version includes improved blade cooling and upgraded materials. These changes enable the turbine to handle higher temperatures, contributing to both improved performance and component durability. To maintain proper rotor thrust balance with the updated flow path, the effective area of the compressor discharge pressure seal was also adjusted.

In terms of operational performance, the LM2500+G4 offers measurable improvements over the LM2500+ across a variety of ambient conditions. For example, it delivers approximately 11% more power in cold conditions and 12% more in hot conditions (running data to -50 deg F and start data to –40 deg F). In combined-cycle mode, the G4 variant is expected to provide a power increase of 8.5% and a heat rate improvement of 0.75% compared to the LM2500+.

The LM2500+G4 supports two power turbine configurations:

• A six-stage, low-speed power turbine, typically used for power generation applications with a nominal speed of 3600 rpm.
• A two-stage High-Speed Power Turbine (HSPT), used for mechanical drive applications, designed for a nominal speed of 6100 rpm, with an operating range from 3050 to 6400 rpm.

Both configurations support operation over a cubic load curve, which allows the turbine to match power output with varying mechanical loads — a feature especially useful in pipeline compression and similar variable-load industrial applications.

The LM2500+ gas turbine delivers increased power and improved efficiency by building on the proven LM2500 platform. Designed to meet the demanding needs of industrial and offshore operations, it offers a compact, reliable solution for power generation and mechanical drive applications.

The LM2500+ enhances the original LM2500 design by adding a 17-stage high-pressure axial compressor. This additional compressor stage increases airflow and raises the engine’s pressure ratio, resulting in roughly 20% more power output. The turbine uses a ring combustion chamber with advanced dry low emissions (DLE) technology, producing very low levels of NOx and CO emissions to meet strict environmental standards.

A key feature of the LM2500+ is its low-speed turbine section, which is specifically designed for offshore platforms and other space-restricted environments. This turbine’s compact size and modular design allow for easy maintenance, with split compressor casing and in-place blade replacement that reduce downtime and operational complexity. The turbine is factory-tested and pre-wired for straightforward installation, supporting both 50 Hz and 60 Hz power generation without the need for additional equipment like reducers.

Operators benefit from the LM2500+’s enhanced power and fuel efficiency, which help reduce operational costs and improve performance in applications such as combined heat and power systems, industrial power generation, underground gas storage, and gas pipelines. Its modular, space-saving design fits well in offshore installations where size and weight are critical factors.

the LM2500+ ensures continuous performance and maximizes uptime, making it a trusted solution for critical power needs across various industrial and offshore applications.