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Turbine Lubrication and Oil System Quiz

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Questions and Answers

Why are steam-tight glands necessary on turbine shafts?

To increase the flow of steam from the steam space along the shaft

To minimize corrosion on the turbine shaft

To allow steam to escape to the atmosphere

To prevent steam leakage along the shaft (correct)

What is the purpose of carbon segments in the sealing rings?

To minimize corrosion in the casing grooves

To lubricate the turbine shaft

To increase steam pressure on the turbine shaft

To prevent steam leakage around the outside of the ring (correct)

What is the function of the garter spring in the carbon sealing rings?

To increase radial movement of the packing

To restrict steam flow to atmosphere

To prevent steam leakage through the shaft openings

To hold the assembled segments together and to keep them on the shaft (correct)

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

<p>To offer a very narrow and winding path to restrict steam leakage</p> Signup and view all the answers

What is the purpose of keeping a narrow clearance between the turbine shaft and casing in labyrinth glands?

<p>To immediately reduce steam pressure escaping through the clearance</p> Signup and view all the answers

Study Notes

Lubrication System

Excess lubricating oil is supplied to turbine bearings to carry away heat conducted from the steam space and maintain safe working temperatures.
The lubricating oil system is driven by a gear-driven oil pump from the main turbine shaft, supplying oil under pressure for positive bearing lubrication.

Oil Flow Path

High-pressure oil from the oil pump branches off to the governing system for turbine speed regulation.
The oil then passes through a relief valve to prevent overpressure, and then through an oil cooler to reduce its temperature.
The oil pressure is reduced by a pressure reducing valve (PRV) to a suitable level for bearing lubrication.
The lubricating oil then feeds through both high-pressure (H-P) and low-pressure (L-P) bearings before returning to the oil tank.

Carbon Sealing Rings

Small turbines use carbon sealing rings for shaft sealing, as shown in Figure 3.
Segmental carbon sealing rings are used for steam glands on the turbine shaft, as shown in Figure 7.

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Description

Test your knowledge about turbine lubrication and the lubricating oil system. Learn about the purpose of excess oil supply and its role in carrying away heat from the turbine bearings. Watch the provided video for visual understanding.