Chapter 51 - Introduction to Boilers

Question 0

What are Blowdown Valves?

Answer 0

Blowdown valves are located on the line leading from the lowest part of the waterside of the boiler.

Question 1

What is a baffle?

Answer 1

A wall, barrier or panel used to change the direction of flow of a liquid or gas.

Question 2

What is a Combustion Chamber?

Answer 2

The combustion chamber, also called the furnace or firebox, is where air and Fuel combine in a chain reaction to cause sustained burning.

Question 3

What are Combustion Gases?

Answer 3

Combustion gases are the hot gases from the fire. These are called “flue gases”

Question 4

What is an externally-fired boiler?

Answer 4

An externally-fired boiler is a boiler which the combustion chamber outside of the boiler shell. This type of furnace is not surrounded by water but is surrounded by brickwork.

Question 5

What is Feedwater?

Answer 5

Feedwater is the water that is fed into a steam boiler to replace the water which has been converted to steam and drawn off from the boiler.

Question 6

What is a firetube boiler?

Answer 6

A firetube boiler is a boiler consisting of a drum containing straight tubes through which the hot combustion gases from the fire travel. Water in the drum surrounds the tubes and heat from the hot gases is transferred through the tube walls to the water.

Question 7

What is a flame scanner?

Answer 7

A flame scanner is a device used to monitor the flame in a boiler.

Question 8

What is a force draft fan?

Answer 8

A force draft fan supplies air to the furnace for the combustion process.

Question 9

What is Gauge glass?

Answer 9

Gauge glass is a strong tubular glass used to indicate the water level in a steam boiler.

Question 10

What is a header?

Answer 10

A header is a large pipe which supplies to, or collects from, a series of smaller pipes or tubes. It is also called a manifold.

Question 11

What are heads on a boiler?

Answer 11

Heads are the steel plates which close off the ends of the boiler drum.

Question 12

What are heating surfaces?

Answer 12

All parts of the boiler through which heat from the burning fuel is transferred to the waterside of the boiler.

Question 13

What is High-pressure steam boiler?

Answer 13

A boiler which operates at pressures above 103 kpa. They are also called power boilers.

Question 14

What is a Horizontal return Tubular Boiler (HRT)?

Answer 14

An HRT boiler is a firetube boiler usually supported in a brick combustion chamber.

Question 15

What is a induced draft fan?

Answer 15

An induced draft fan draws combustion gases out of the boiler and discharges them up the chimney.

Question 16

What is an internally-fired boiler?

Answer 16

An internally fired boiler has a combustion chamber located within the shell of the boiler, or a furnace surrounded by watertubes.

Question 17

What is the lowest permissible water level?

Answer 17

The lowest permissible water level is the lowest level at which the boiler can be safely operated without damaging or overheating any part Of the boiler.

Question 18

What is a waterline?

Answer 18

The water line is the actual level of water in the boiler

Question 19

What is a waterleg?

Answer 19

A waterleg is a water-filled section extending from the shell, which surrounds the firebox of some types of firetube boilers. most locomotive boilers are equipped with waterlegs around the firebox.

Question 20

The steam space of a boiler consists of?

Answer 20

Portion of the boiler not filled with water.

Question 21

The steam space of a boiler must be large enough to?

Answer 21

Separate the water from the steam

Question 22

All parts of the boiler exposed to fire or flue gases must be covered by..

Answer 22

Water.

Question 23

A steam boiler should be compact in design in order to

Answer 23

Reduce building cost

Question 24

Power boilers usually require _____ blowdown valves.

Answer 24

2

Question 25

High pressure boilers operate at pressures above?

Answer 25

103 kPa

Question 26

A characteristic that made early boilers very inefficient was:

Answer 26

Lack of heating surface.

Question 27

On older boilers, the masonry work that surrounded the furnace was termed:

Answer 27

The boiler setting

Question 28

The heating surface of a boiler consists of all parts that:

Answer 28

Have water on one side and hot gases on the other side

Question 29

The Haycock boiler was:

Answer 29

Used around 1720

Question 30

An early shell-type boiler had ___________ as its heating surface:

Answer 30

Only the lower part of the shell

Question 31

A safety valve is a fitting that will prevent the boiler pressure from exceeding a set maximum by:

Answer 31

Popping open and reducing pressure before closing

Question 32

The _______ fan blows combustion air into the wind box of a boiler.

Answer 32

Forced draft

Question 33

A hot water boiler is considered a high temperature water boiler when:

Answer 33

It’s design pressure is greater than 1100 kpa

Question 34

An induced draft fan handles:

Answer 34

Flue gases from the combustion chamber.

Question 35

A water leg is found on a/an ____________ boiler.

Answer 35

Locomotive boiler

Question 36

The term “boiler failure” refers to:

Answer 36

A rupture of a pressure contain part of the boiler

Question 37

Blowoff valves are used to:

Answer 37

Drain or remove sediment from the bottom of the boiler