Friday, June 18, 2010

Week 10, 9thJune

Azlan (SBO) explained the trend of turbine speed during the start up. Before the turbine can be fired and brought to operating speed, it must first be rotated or cranked by an motor, operating through a torque converter to provide the cranking torque and speed required by the turbine startup. After the cranking speed reach 25% of the full speed, the turbine will start purging.

The process of purging stop when the turbine speed drops to 9% of the full speed. The function of purging is to drain out all the combustable gas from combustion compartment until exhaust compartment.

The process of firing starts after the purging until the turbine speed reach full speed.

Turbine speed trend

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