LM2500+ G4 Gas Turbine

Gas Turbine

Also known as:

Turbine, Combustion Turbine

LM2500+ G4 Gas Turbine

Gas Turbine

Also known as:

Turbine, Combustion Turbine

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Delivery Time:

52 Weeks

Note:

The LM2500+G4 gas turbine has an updated core with increased airflow and improved turbine cooling, providing more power and better fuel efficiency for oil and gas applications like pipeline compression and LNG processing.

Executive Summary

The LM2500+G4 is the fourth-generation model in the LM2500 gas turbine series. It delivers 41% more power than the base LM2500 while maintaining the same high levels of reliability, availability, and efficiency.

This version features increased flow capacity in the high-pressure compressor, high-pressure turbine, and low-pressure turbine, resulting in a higher pressure ratio (24.2 vs. 23.6) and improved fuel efficiency.

The LM2500+G4 is available with either a low-speed or high-speed power turbine, making it ideal for both power generation and mechanical drive applications, including pipelines, LNG, and refineries.

Technical Specifications

Power	36.98 MW
Output	47,370 shp (35,320 kW)
SFC	.352 lb/shp-hr (214 g/kW-hr)
Heat rate	6,469 Btu/shp-hr
Exhaust gas flow	205 lb/sec (93 kg/sec)

Exhaust gas temperature	1,020°F (549°C)
Power turbine speed	3600 rpm
High Pressure Compressor	17-stage; added zero-stage blisk

Features and Benefits

For extreme hot and cold ambient condition
Capable of operating with a variety of fuels
High reliability and lower initial capital investment on a $/kW
Enhanced availability due to modular design
Fuel Efficient

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Detailed Description

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.