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Flashcards in Steam Boilers Deck (83)
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1

Is Lancashire boiler stationary or movable ?

Stationary

2

Where is Lancashire boiler used ?

Sugar mills and textile industry

3

Why should water reserve be high for Lancashire boiler be high ?

Large quantity of steam is needed

4

Is the Lancashire boiler internally or externally fired ?

Internally fired

5

How many passes does it have for flue gases ?

3 passes

6

Why does Lancashire boiler have good steaming quality (allowing for the use of low quality coal) ?

Heats water from three sides

7

What is the shape of the main shell ?

Cylindrical

8

What is the cylindrical shell mounted on ?

A brick structure

9

How many base flue gas lines are there ?

One

10

How many side flue gas lines are there ?

Two

11

How many flue tubes does the main cylindrical shell have ?

Two flue tubes

12

Where are the flue gases generated ?

At the grate

13

How many grates are there ?

Each flue tube has one

14

In what manner is the grate supported by a bridge ?

So that ash and coal do not enter the tube

15

Where do the flue gases go ?

End of the tube and then down

16

What happens to the flue gases when they reach the front of the boiler ?

Get divided into two streams and pass through side flues

17

Where do the flue gases go after travelling through the side tubes ?

Expelled to atmosphere through chimney

18

What should be the water level in the boiler ?

Above the main flue tubes

19

How is the water heated ?

By the passage of outgoing flue gases

20

How is fuel combustion controlled ?

Dampers

21

What do dampers do ?

They reduce the flow of air by partial closing of the passage of the chimney

22

How are the dampers controlled ?

By chain and pulley block from outside

23

Where are superheaters kept, when they are provided ?

End of main flue tubes

24

What the mountings on top of the Lancashire boiler ?

Manhole, safety valve, steam collecting pipe

25

What are the mountings in front of the Lancashire boiler ?

Pressure gauge and water level indicator

26

What are the mountings provided at the bottom of the Lancashire boiler ?

Blow off cock

27

Where is the fusible plug mounted ?

Top of each main flue tube, just above the grate

28

Why is the efficiency of Lancashire boiler high ?

Because of mountings like economizer, superheater, large heat transfer area

29

Why is the surface area for the burning of coal reduced ?

The furnaces are inside the flue tubes

30

What is another disadvantage of Lancashire boiler ?

Occupies a considerable floor area, requiring extensive brick work