Power Plant Turbines: Bearings and Operation

State the functions of the following basic components typically found in a turbine lube oil system: reservoir main lube oil pump booster pump and lube oil coolers. State the functions of the following additional components typically found in a turbine lube oil system: alternating current (AC) auxiliary pump direct current (DC) emergency pump AC turning gear pump and vapor extractor. Explain why it is important to make sure that the controllers for the standby oil pumps are in the standby or automatic positions. Describe a situation in which an increase in bearing oil temperature could indicate a problem. Describe a situation in which an increase in bearing oil temperature is considered normal. Identify two major systems commonly used to control turbine speed. Describe the basic components of a turbine speed control system. Describe how turbine speed is controlled by a mechanical-hydraulic control system with a flyweight governor. Describe what happens when a turbine trip occurs. Explain why the warm-up period is important. Explain why it is important to prevent water buildup and describe how this is done. Describe the steps involved in a typical shutdown procedure.