Lm2500 Instrumentation

The instrumentation and sensing devices required for normal operation and control and are discussed in this section. Purchaser interfacing equipment requirements are described herein, the Engine Control System Specification, and on the gas turbine electrical schematic. This section describes the minimum instrumentation requirements for LM2500 SAC gas turbine installations. Electrical contains electrical requirements and recommendations related to lead routing, shielding, connectors, and cabling. Location and interface requirements for all engine mounted instrumentation and sensing devices are described on Installation Drawings. The instrumentation requirements are described as those required for the core control of the fuel and air and those required for monitoring the safe operation of the gas turbine. All instrumentation listed herein is considered to be required.

Core Control and Protective Function Sensors

The Engine Control Unit (ECU), described in the Controls, requires the parameter values shown in Table 1 as direct input, properly conditioned, for fuel and air control, and for protective safety functions. Select the parameter name to view the parameter/sensor installation data and installation requirements.

Additional Protective Functions

The parameters shown in Table 2 are required to assure safe and reliable operation of the gas turbine. The sensor signals, properly conditioned, can be input into the ECU for fault accommodation logic processing. Alternatively, the fault accommodation logic can be processed within the system control panel, and the resultant output can be included a discrete input to the ECU. Regardless of the control implementation, the sequence timing and electrical interface must meet the requirements of this IDM.

Instrumentation

Table 1. Instrumentation Required for Engine Control Input.

Parameter Label GT

Provision Expected Level

HPC Discharge Static Pressure PS3 1 Tap 0 - 500 psia (0 - 3447 kPa) UV Flame Detector (2 required with gas/water or gas steam fuel systems) FLAMDT

Optional Sensors 0 - 1 (Integer)

PT Inlet Temperature T5.4 11 Probes -40 - 2000°F (-40 - 1093.3 °C)

HPC Speed NGG 2 Sensors 0 - 12,000 rpm

PT Speed NPT 2 Sensors 0 - 5,000 rpm

Table 2. Additional Protective/Monitoring Function Required Instrumentation

Parameter GT


HPC Discharge Temperature (Steam Injected

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Additional Instrumentation for Condition Monitoring

Additional Purchaser supplied condition monitoring instrumentation is recommended for monitoring and trouble shooting of the gas turbine system, but is not mandatory. The following is recommended for installation in the Purchaser’s hardware.:

Models) T/C Probe -40 - 2000°F (-40 - 1093

GG HP Rotor Vibration Accelerometer 0 - 15 mils DA

0 - 4 ips velocity(0 -101 mm/sec.)

PT Rotor Vibration Accelerometer 0 - 15 mils DA

0 - 4 ips velocity(0 -101 mm/sec.)

GG Oil Supply Temperature RTD -40 - 400°F

(-40 - 204°C)

GG Oil Scavenge Temperature (5 required) RTDs

-40 - 400°F (-40 - 204°C)

Scavenge Oil Chip Detectors(5 required)

Sensor > 100 ohms

GG Oil Supply Pressure Tap 0 - 150 psig

(0 - 1034 kPa)

GG Oil Scavenge Pressure Tap 0 - 150 psig

(0 - 1034 kPa)

Fuel Secondary & Primary Temperature (Dual fuel) 2 Sensors (T/C) 0 - 1000°F (-18 - 538°C)

Water Manifold Temperature (Water NOx control) Sensor (T/C) 0 - 1000°F (-18 - 538°C)

PT Inlet Pressure Tap 0 - 100 psia

(0 - 689 kPA)

HP Recoup Pressure Tap 0 - 200 PSIA

(0 - 1379 kPA)

Table 3. Additional Protective/Monitoring Function Required Instrumentation

Parameter GT


HPC Inlet Temperature Probe -65 - 130°F (-54 - 54°C)

HPC Inlet Pressure Tap 12 - 16 psia (83 - 110 kPaA)

VSV Position LVDT LVDT Position Sensor - -

NOx Water Flow (When Applicable) - - 0 - 25,000 lb/hr 0 - 11,340 kg/h)



Gas Turbine Operating Time/Temperature History System

The expected hot section repair interval of the gas turbine depends on many factors, and therefore a permanent log of gas turbine operating conditions including starts, trips, and time at temperature is highly recommended, since this information can be useful in planning maintenance activities.

The installation design should include provisions to collect data and display count of starts, trips, total operating time, and operating time at various levels of T5.4. The levels of T5.4 selected for data collection will be site and application dependent. The Purchaser should work with GE on an application by application basis to determine mutually agreeable temperature levels.

For steam injection operation, capability should be built into the system to record hours of operation with steam injection in each of the steam supply systems. A recommended time at power and temperature monitoring system is shown in Figure 1.

Figure 1. Recommended LM2500 Time at power and Temperature Monitoring

NOx Steam Flow (When Applicable) - - 0 - 25,000 lb/hr 0 - 11,340 kg/h)

CDP Steam Flow (when Applicable) - - 0 - 50,000 lb/hr (0 - 22,680 kg/h)

Fuel Supply Temperature - - 0 - 350°F (177°C)

Fuel Flow - - 0 - 15000 PPH (6800 kg/h)

Liquid Primary manifold supply pressure - - 0 - 500 psig (3.44 MPa)

Liquid Secondary manifold supply pressure - - 0 - 350 psig (2.41 MPa)

Gas Manifold supply pressure - - 0 - 350 psig (2.41 MPa)

Water Manifold pressure - - 0 - 350 psig ( 2.41 MPa)

PT discharge Pressure (P8) (Useful when diverter door mal-operation may affect back pressure) - - 0 - 36 in H2O ( 8.9 kPa)

PT discharge Temperature (T8) (Useful for exhaust duct and heat exchanger monitoring) Minimum of 6 T/C's is recommended.

- - 0 - 1000°F (538°C)



Installation Design Considerations

The Purchaser should refer to Electrical for specific recommendations related to instrumentation, electrical lead routing and shielding, connectors and cabling, and other installation considerations in low current/voltage level instrumentation signal leads.

All instrumentation connections to the gas turbine must be flexible to permit thermal expansion without placing undue loads on the connection points.

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Lm2500 Instrumentation