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The LM2500-PE and LM2500-PH (STIG) series gas turbine is a simple cycle, two shaft engineconsisting of a gas generator and a six stage power turbine. Shaft power is extracted by means of aPurchasersupplied flexible coupling extending through a shaft tunnel within the Purchasersexhaustcollector. The gas generator consists of a variable geometry compressor; a dry low emissions (DLE)triple annular combustor; a high pressure turbine (HPT); an accessory drive gearbox; and controls andaccessories. The power turbine (PT) is a six stage, low pressure turbine, aerodynamically coupled to thegas generator and driven by the gas generator exhaust gas. The LM2500-PE and LM2500-PH (STIG)series gas turbines are identical, with the exception of the flow function of the high pressure and lowpressure turbines, both of which, in the LM2500-PH gas turbine, are modified to accommodate theincreased mass flow resulting from injection of steam in quantities greater than that which can beaccepted (without modification) by steam-injected models of the LM2500-PE gas turbines.

The cycle of the gas turbine begins with air entering the inlet bellmouth of the gas generator and directedinto the compressor by the variable pitch inlet guide vanes (IGVs). Gas generator normal operating

speed is 6,800 to 10,050 rpm. The compressed air leaving the compressor is directed into the singleannular combustor section where it mixes with fuel. The fuel/air mixture is initially ignited by a singleigniter. Once initiated, combustion is self sustaining and the ignitor is turned off. The hot combustiongases are directed into the HPT, and the HPT drives the compressor rotor. Hot gases from the gasgenerator are then directed into the power turbine, and the PT drives the output shaft. The power turbinenormal operating speed is 2000 - 3600 rpm. Exhaust gases from the PT are turned 90 by thePurchasers exhaust duct.

The gas generator rotor is supported by three main roller bearings and one ball thrust bearing. The powerturbine rotor is supported by two roller bearings and one thrust bearing. For detail descriptions of eachgas turbine component, select it in the table below.

Instrumentation

Description

Inlet Section Compressor Section

Front Frame Assembly Compressor Rotor

Compressor Stator Variable Stator Control System

Compressor Rear Frame Combustion System

High Pressure Turbine Turbine Midframe

Accessory Gearbox Power Turbine

Turbine Rear Frame Flexible Coupling AdapterLubrication System Ignition System

Electrical System Air Cooling and Pressurization System

Fuel and Steam System Starting System

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The LM2500 SAC gas turbine is equipped with the following instrumentation:

2 Gas generator speed sensors, magnetic pickup type

2 PT speed sensor, magnetic pickup type

1 Set (qty 11) PT inlet (T54) temperature sensors

1 Gas generator mounted accelerometer

1 PT mounted accelerometer

1 GT Oil supply resistance temperature detector (RTD)

5 GT Oil scavenge RTD

5 GT Oil scavenge electrical chip detectors

1 Pressure tap for lube oil supply

1 Pressure tap for lube oil scavenge

1 LVDT for VSV position

2 Pressure taps for compressor discharge1 Pressure taps for fuel manifold pressures

1 Pressure tap for PT inlet (P54)

2 Pressure taps for HP recoup

1 Dual element T3 sensors (T/Cs)

1Redundant P2/T2 sensor (one sensor, twotemperature RTD's, and one pressure tap)

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