LM2500 PT

Power Turbine

Also known as:

Gas Turbine, Steam Turbine, Turbine Generator

LM2500 PT

Power Turbine

Also known as:

Gas Turbine, Steam Turbine, Turbine Generator

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The LM2500 Power Turbine is designed to convert the exhaust energy from the gas generator into mechanical power, which can then be used for various applications like electricity generation or driving mechanical loads.

Executive Summary

The LM2500 features a free spinning six-stage power turbine, meaning that it is a multi-shaft machine and the high-pressure turbine and compressor are not mechanically connected to the low-pressure power turbine which drives the electric generator.

Because the power turbine is free spinning, it can accelerate very quickly to compensate for any frequency drops. The result is more stable and smoother operations for all equipment connected.

Technical Specifications

Power turbine speed 3600 rpm
Power Turbine 6-stage free
Exhaust gas flow 155 lb/sec (70.5 kg/sec)
Exhaust gas temperature 1,051°F (566°C)
Thermal Efficiency 36%

Features and Benefits

  • Free power turbine design.
  • 6-Stage Low-Speed or 2-Stage High-Speed Power Turbine Options
  • High Operational Speed Range (3050–6400 RPM for HSPT)
  • Multi-Shaft Configuration
  • Low Speed

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Detailed Description

The LM2500 is a multi-shaft gas turbine featuring a free-spinning power turbine, making it well-suited for dynamic and high-demand environments such as those found in oil and gas operations. In this design, the high-pressure turbine and compressor are mechanically independent from the low-pressure power turbine. This separation allows the power turbine, which drives the electric generator or mechanical load, to respond rapidly to changes in load demand. Its ability to accelerate quickly makes it ideal for applications where maintaining grid stability or mechanical output is critical. In scenarios where frequency fluctuations occur, the free power turbine can quickly compensate, helping to stabilize the grid and ensure smoother operation of all connected systems.

In its standard configuration, the LM2500 is equipped with a six-stage, low-speed power turbine. This turbine operates at a nominal speed of 3600 rpm and is designed to deliver reliable shaft power in steady-state conditions, making it particularly effective for electric power generation or mechanical drive in pipeline and process operations.

For applications requiring greater flexibility or higher continuous output speeds, the LM2500+G4 variant offers enhanced capabilities. It is available with either the standard six-stage, low-speed power turbine or an alternative two-stage high-speed power turbine. The high-speed variant is engineered for mechanical drive and other demanding industrial uses, with a design speed of 6100 rpm and an operating range from 3050 to 6400 rpm. This configuration supports continuous high-speed shaft output where needed and is particularly beneficial for compressors and other rotating equipment in oil and gas facilities.

Both the six-stage and two-stage power turbines can be operated over a cubic load curve, providing the adaptability required for variable load profiles commonly encountered in oil and gas operations. This flexibility, combined with the LM2500’s rapid response characteristics and modular design, makes it a dependable choice for critical infrastructure in upstream, midstream, and downstream sectors.