Turbomachinery Package Specification

Taurus 60 Compressor Set and Mechanical Drive

 

 

The fuel control valve gradually opens and admits fuel into the combustor through the injectors. The inlet guide vanes open and the bleed valve gradually closes. Fuel flow, engine temperature, and turbine speed all increase. Once starter dropout speed is exceeded, the starter freewheels and is de-energized. The engine continues to accelerate under its own power.

10.4.2Steady-State Control

During steady-state operation, the control system keeps the equipment within specified operating conditions. The maximum power limit is determined by engine temperature and speed.

Temperature control is based on the third-stage nozzle temperature (T5). Six thermocouples are used and the values averaged. If one thermocouple has a value that deviates from the average by more than a preset amount, an alarm is generated by the control system. If two thermocouples deviate, the package is shut down.

Special sensors continuously monitor the gas turbine speed and the control system makes adjustments to meet operating requirements and to keep the speed within specified limits. A separate backup overspeed detection system provides additional protection by automatically shutting the engine down if a preset overspeed limit is reached.

10.4.3Stopping

The gas turbine may be shutdown either manually or automatically.

The Normal Stop command initiates a cooldown stop. The gas compressor is depressurized (if applicable) and the gas producer runs at idle speed for a preset time to allow the gas turbine and driven equipment to cool, then the fuel valves close. The Emergency Stop command results in the immediate depressurization of the gas compressor and closure of the fuel valves without a cooldown period.

In the event of a hazardous condition or equipment malfunction, the control system will shut the package down automatically. These shutdowns are divided into four categories:

•Cooldown stop nonlockout (CN)

•Cooldown stop lockout (CL)

•Fast stop nonlockout (FN)

•Fast stop lockout (FL)

Cooldown and fast stops correspond to the manual normal and emergency stops respectively. Lockout stops inhibit operation of the control system and prevent restarting until the malfunction is reset. Lockout stops result from serious malfunctions that require corrective action before the system can be restarted. Nonlockout stops result from an operational disruption or abnormal condition and can be reset when conditions return to normal.

In all cases, after the package has come to a complete stop and the rundown timer has timed out, the control system initiates and supervises a post-lube cycle to protect the gas turbine and driven equipment bearings from thermal damage. If the shutdown is the result of a fire being detected, start of the post lube cycle is delayed for 10 minutes unless an operator intervenes.

10.4.4Vibration and Temperature Monitoring

In addition to the T5 thermocouples, the system provides continuous monitoring of temperature and vibration levels at key package locations. Refer to the Specification Table for details.

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TPS60CSMD/309

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