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 3-inch sleeve-style hot air purge valve is designed for aero-derivative industrial gas turbines to control the flow of hot compressor bleed air used in critical purge operations. This valve is normally closed and solenoid-pilot actuated, available in two- or three-inch sizes with elbow sleeve design. It operates on 24 or 125 VDC power and is constructed with ANSI B16.5 Class 600 raised face flanges.

Key specifications include a physical size of approximately 7.5 inches wide and 25 inches high, weighing between 84 to 91 pounds. It can handle line pressures up to 500 psig and actuation pressures between 80 and 125 psig. The valve is rated to operate in fluid temperatures ranging from 32°F to 1100°F (bleed air), and can withstand ambient temperatures between –20°F and 240°F with heat soak up to 400°F for 1 to 2 hours when de-energized.

Performance characteristics include a flow capacity of about 1.2 pounds per second of compressor bleed air with a maximum pressure drop of 0.70 psi across normal operating conditions. Internal leakage is minimal, rated at 0.00025 pounds per minute. The valve features a rapid full stroke response time of 1 second for both opening and closing cycles. It includes a position indicating switch and supports continuous duty operation.

Functionally, this valve plays a crucial role in purging residual fuels, such as diesel, from the combustor fuel lines when switching fuels, preventing deposits that can impair turbine performance or cause damage. The valve is often installed in pairs for dual redundancy to enhance safety and operational reliability. With millions of field operating hours, this design reflects high durability and precise control essential for efficient and safe turbine operation.

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+G4 DLE U PT is a versatile gas turbine designed for a wide range of applications, including onshore and offshore power generation, gas pipeline compression, and LNG compression. It features Dry Low Emissions (DLE) technology, which reduces nitrogen oxide (NOx) emissions to as low as 25 parts per million by volume (ppmv) at 15% oxygen, meeting stringent environmental standards.

In the oil and gas industry, production rates are closely linked to available horsepower. The LM2500+G4 DLE U PT offers higher power output, high reliability, and a lower initial cost per kilowatt, making it a cost-effective solution for energy-intensive operations.

This turbine has proven its capability to operate reliably in extreme ambient conditions, with running data demonstrating performance at temperatures as low as -50°F and start-up capability down to -40°F. This wide operational temperature range ensures dependable service in harsh environments.

Fuel flexibility is a key strength of the LM2500+G4 DLE U PT. It can seamlessly switch between various fuels—lean treated natural gas, rich offshore gas, propane, or diesel—without shutting down or losing efficiency. This flexibility supports energy security, allowing continuous operation even if the natural gas supply is interrupted. Additionally, the turbine can be adapted to burn alternative fuels like bioethanol and naphtha, further enhancing fuel options.

A notable advantage of aeroderivative gas turbines like the LM2500+G4 DLE U PT is their ability to operate on hydrogen blends, which produce no carbon emissions when combusted. Both new turbines and existing units can be converted for high hydrogen fuel use, supporting decarbonization goals.

Moreover, the LM2500+G4 DLE U PT is truly dual-fuel capable, able to switch from 100% natural gas to 100% propane without the need for pilot fuels. This contrasts with dual-fuel reciprocating engines, which typically require about 5% diesel during gas operation, increasing costs and emissions. The LM2500+G4 DLE U PT’s fuel flexibility, emission controls, and robust design make it a reliable and efficient choice for demanding mechanical drive and power generation needs in the oil and gas sector.

The LM2500 Gas Generator is the core component of the LM2500 gas turbine, responsible for producing the high-energy gas flow needed to drive the power turbine. It features a 16-stage axial compressor that efficiently compresses incoming air, a single annular combustor where fuel and air mix for optimal combustion, and a two-stage high-pressure turbine that extracts energy to power the compressor.

Designed for durability and high performance, the LM2500 Gas Generator supports a wide range of fuel types, including natural gas and liquid fuels, enabling flexible operation in various industrial and marine settings. Its modular construction allows for easier maintenance and faster engine removal or replacement, minimizing downtime.

With advanced aerodynamics and robust engineering, the LM2500 Gas Generator delivers reliable, efficient gas flow, helping ensure consistent power output and lower emissions across demanding operating conditions.

The LM2500XPRESS+G5 DLE UPT is a modular aeroderivative gas turbine system built for fast, flexible, and efficient power generation in both onshore and offshore environments. It is particularly well-suited for applications across LNG facilities, gas pipelines, gas processing plants, and general power generation, including electricity production at both 50 and 60 Hz, without the need for a speed reducer.

The "+G5" designation refers to its fifth-generation power turbine, offering the highest output and efficiency in the 20–40 MW class. It supports both high-speed and low-speed power turbine configurations, allowing integration into a variety of grid or mechanical drive systems.

At its core, the G5 includes a high-pressure compressor derived from the LM2500+G4, now redesigned for longer service life. In a simple cycle, it achieves up to 41% efficiency, which is notable for a turbine of this size class. The system can start from cold and reach load in about five minutes, making it ideal for rapid-response applications.

The unit is built for speed and simplicity. It’s shipped in preassembled modules, with a compact footprint that helps reduce installation time.

The Dry Low Emissions (DLE) system supports environmental compliance without requiring water or steam injection, simplifying operations and reducing resource demands.

Altogether, the LM2500XPRESS+G5 DLE UPT provides a practical solution for projects that need reliable, fast, and efficient power without a complex setup.