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Turbine Lubrication System Quiz

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Questions and Answers

What is the purpose of supplying excess lubricating oil to the turbine bearings?

To reduce friction between the turbine bearings

To carry away heat conducted along the shaft from the steam space (correct)

To increase the pressure of the lubricating oil

To cool the steam before it enters the turbine

From where is the oil pump in the lubricating oil system driven?

The steam space

The oil cooler

The pressure reducing valve (PRV)

The main turbine shaft (correct)

What is the role of carbon sealing rings in small turbines?

To increase friction between the turbine bearings

To restrict the flow of steam from the steam space along the shaft to the atmosphere (correct)

To reduce the pressure of the lubricating oil

To cool the steam before it enters the turbine

What does the relief valve located in the lubricating oil system protect?

The oil pump and piping from overpressure Signup and view all the answers

What is the purpose of the carbon sealing rings in the turbine casing?

To prevent steam leakage around the outside of the ring Signup and view all the answers

What holds the carbon sealing ring segments together and to the shaft?

Garter spring Signup and view all the answers

Why are labyrinth glands used in high output machines operating with high temperature and high-pressure steam?

To prevent leakage of steam along the shaft Signup and view all the answers

What is the purpose of keeping the clearance between the turbine shaft and casing as narrow as possible?

To immediately reduce steam pressure Signup and view all the answers

How are labyrinth glands designed to restrict steam leakage to atmosphere?

By creating a narrow and winding path for steam to pass through Signup and view all the answers

Why are carbon rings in the turbine sealing system self-lubricating?

To minimize friction and wear on the shaft Signup and view all the answers