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1. UT Basic/ Advanced > UTB9 Boilers > Flashcards

UTB9 Boilers Flashcards

1
Q

At what temperature Fahrenheit does water reach the boiling point?

A

212°

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2
Q

What is the melting point of a fire-actuated fusible plug filled with an alloy of tin, copper, and lead?

A

445°F to 450°F

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3
Q

The bottom of the inverted bell of the liquid sealed draft gauge is sealed with which substance?

A

oil or mercury

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4
Q

Which method is used to clean out a boiler fouled with grease?

A

Boiling out

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5
Q

What color should the pull chain handle be painted for the center gauge cock?

A

Green

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6
Q

An increase in pressure results in what effect on the boiling point temperature of water?

A

Increase

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7
Q

What is the difference between dry saturated steam and wet statured steam?

A

Absence of water particles in suspension

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8
Q

Which description identifies a water-tube boiler?

A

Products of combustion surround the tubes through which the water flows.

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9
Q

In a water-tube boiler, how are baffles usually arranged?

A

Directly across the tubes three times prior to being discharged from the
boiler.

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10
Q 
Which is NOT a type of fire-tube boiler?
A. Horizontal supply tubular
B. Firebox
C. Scotch marine
D. Vertical tube
A

A. Horizontal supply tubular

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11
Q

Which safety device provides added protection against low-water conditions?

A

Fusible plugs

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12
Q

Which type of fire-tube boiler are UTs assigned to operate and maintain more often than any other type?

A

Horizontal fire-tube

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13
Q

Where is the blowdown pipe of a vertical tube boiler attached on the water leg?

A

Lowest part

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14
Q

Gas flows into the horizontal return tubular boiler from what component?

A

Firebox to rear of boiler

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15
Q

Where are the manholes located on a horizontal return tubular boiler?

A

Upper part of shell

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16
Q

What is the position of the air cock prior to firing a cold boiler with no steam pressure?

A

Open

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17
Q

Which piece of equipment facilitates the removal of gases through the stack?

A

Induced draft fan

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18
Q

Which blowdown valve permits the removal of scale and sediments from the water column?

A

Water column blowdown

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19
Q

The fire-actuated plug has a melting point of how many degrees Fahrenheit?

A

445°F to 450°F

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20
Q

Which equipment steadies the water level in the gauge glass through the reservoir capacity of the column?

A

Water column

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21
Q

What are the three lengths associated with the electrode assembly?

A

High, Low, and Burner cutout

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22
Q

What is the purpose of try cocks?

A

To prove the water level in the boiler

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23
Q

How many safety valves are required on a boiler that has more than 500 square feet of heating surface?

A

2

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24
Q

What device on the safety valve is provided to lift the valve from its seat?

A

Lifting lever

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25
Q

A steam injector can lift a stream of water at a temperature of 120°F how many feet?

A

14 feet

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26
Q

(True or False) The water supply should not be hotter than 120°F for the injector to operate.

A

True

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27
Q

What is known as the process of maintaining a difference of pressure between two points in a system?

A

Pressure regulating

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28
Q

Which is NOT a function of the pressure control?
A. To control the pressure in the boiler.
B. To secure water flow when temperature reaches 500°F.
C. To secure the fuel burning equipment when the pressure reaches a
predetermined cutout.
D. To start fuel burning equipment when the pressure drops to the cut-in
point.

A

B. To secure water flow when temperature reaches 500°F.

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29
Q

What are the two settings on the pressure control?

A

Cut-in point and differential

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30
Q

Which method is used to controlling combustion air?

A

Manually adjusted air damper

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31
Q

What is the only means of obtaining the correct ratio of fuel to air?

A

Setting of air damper

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32
Q

In combustion control, what is the normal atomizing pressures in pounds per square inch?

A

95 and 120 pounds per square inch

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33
Q

How many seconds after flame failure will the burner equipment be secured?

A

4

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34
Q

Safety shutdown sequence will commence after how many seconds after pilot flame is not established and confirmed?

A

7

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35
Q

Which meter is used as a guide in controlling the relationship between air required and air actually supplied to burn the fuel?

A

Combustion air and steam flowmeter

36
Q

What unit of measurement is associated with draft gauges?

A

Inches of water

37
Q

Which are scale-forming elements?

A

Precipitates of hardness and silica

38
Q

What type of coating does silica leave behind when it precipitates in boiler feedwater?

A

Hard glossy

39
Q

What is the most widely used method of treatment of scale?

A

Alkaline phosphate-tannin

40
Q

Boilers operating at what pressure are normally used for hot-water generation?

A

15 psi or less

41
Q 
Which reagent is NOT used in the test for hardness?
A. Hardness indicator
B. Hardness buffer
C. Hardness filter
D. Hardness titrating solution
A

C. Hardness filter

42
Q

What function does carbon play in the test for phosphates?

A

Absorbs the tannin

43
Q

Concentrated stannous chloride should be discarded after how many months after preparation?

A

2

44
Q

At what temperature, in degrees Farhenheit, should the boiler water sample be for the conduct of the caustic alkalinity without tannin test?

A

70

45
Q

At what temperature, in degrees Fahrenheit, should the boiler water sample be for the conduct of the caustic alkalinity with tannin test?

A

160

46
Q

Prior to conducting the sodium sulfite test, to what temperature, in degrees Fahrenheit, should the boiler water sample be cooled?

A

70

47
Q

When the paper turns orange in the conduct of the pH test, what does this indicate to the operator?

A

pH is too low

48
Q

(True or False) The lower the concentration of ionizable salts, the greater the conductance of the sample.

A

False

49
Q 
Which cleaning method for fire-side boilers is NOT recommended?
A. Scraper cleaning
B. Wet steam sweating
C. Dry steam lancing
D. Hot-water washing
A

C. Dry steam lancing

50
Q

When utilizing the hot-water washing method, at what temperature, in degrees Fahrenheit, should the water be?

A

150

51
Q

How is fireside slag removed from the convection super heaters?

A

By circulating cold water through the tubes.

52
Q

How is water corrosion reduced?

A

Maintaining the boiler water alkalinity at proper levels.

53
Q

After a safe shutdown of the boiler, what is required prior to commencing tube cleaning?

A

Adequate ventilation

54
Q

(True or False) The lower ends of all tubes must be cleaned from the water drum or header.

A

True

55
Q 
Which acid is NOT required in chemical cleaning of boilers?
A. Boric
B. Sulfuric
C. Citric
D. Sulfamic
A

A. Boric

56
Q

What is the purpose of citric acid?

A

Removal of boiler waterside deposits.

57
Q

What are the two methods of boiler acid treatments?

A

Circulation or fill-and-soak

58
Q 
Which is NOT a neutralizing solution?
A. Soda ash
B. Trisodium phosphate
C. Sodium tripolyphosphate
D. Calcium sulfate
A

D. Calcium sulfate

59
Q

When conducting the boiling out method, the temperature of the water in the boiler needs to be at what degree Fahrenheit for at least 24 to 48 hours?

A

200

60
Q

What is the most common cause of major boiler damage?

A

Low water

61
Q

How often are blowdown valves opened?

A

Once daily

62
Q

How often are steam traps tested for correct operation?

A

Once a month

63
Q

The clearance between the shoulder of a manhole plate and the manhole must not exceed what value?

A

1/16 inch

64
Q

How often is a hydrostatic test performed on a boiler?

A

Annually

65
Q

In a hydrostatic test, what is the minimum water temperature of the boiler, in degrees Fahrenheit?

A

70

66
Q

On boilers where the superheated steam reaches 850°F or higher, what material is the super heater tubes constructed out of?

A

Carbonmolybdenum steel

67
Q

What tool is used to remove tubes?

A

Air-powered side-cutting chisel

68
Q

Tubes of 2 inches outside diameter are belled to what minimum distance, in inches?

A

1/8 but no more than 3/16

69
Q

What is the maximum projection into the drum or header for tubes of 2 inches outside diameter?

A

7/16 max

5/16 minimum

70
Q

After the repair of boiler refractories, how many hours must the wall dry with the burner shutters open?

A

12

71
Q

Plastic requires a baking-out temperature range of what value, in degrees Fahrenheit?

A

2900°F to 3000°F

72
Q

When should the head gasket be inspected?

A

Whenever both front and rear doors are opened.

73
Q

How many phases of operation are associated with boiler operation?

A

7

74
Q

Pre-operating checks are performed at what time of boiler operation?

A

Before lining up and lighting off

75
Q

During normal operation of the boiler, how many responsibilities does the operator have?

A

2
maintain proper water level at all times

prevent loss of ignition when burning fuel is in suspension

76
Q

At what temperature, in degrees Fahrenheit, should the flue-gas temperature be above the steam-produced temperature?

A

150

77
Q

How many inches of water should the draft be under normal operating conditions?

A

0.03 to 0.06

78
Q

When should the drum vent valve be opened during normal operations?

A

Drum pressure drops to 25 psig

79
Q

At what temperature, in degrees Fahrenheit, can the boiler be emptied?

A

Below 200

80
Q

How many emergency situations should the operator be aware of when running a boiler?

A

6

(1) low water
(2) high water
(3) serious tube failure
(4) flarebacks
(5) minor tube failure
(6) broken gauge glass

81
Q

The boiler operating log is set up on what frequency for logkeeping?

A

24-hour period divided into three 8-hour shifts
OR
24-hour period divided into four 6-hour shifts

82
Q

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with opening water-gauge glass stop valve?

A

WHITE

83
Q

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with closing water-gauge glass stop valve?

A

RED

84
Q

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with the top gauge cock?

A

YELLOW

85
Q

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with the bottom gauge cock?

A

BLUE

86
Q

What device is used to hold a switch lever in the off position?

A

Lockout

1. UT Basic/ Advanced (25 decks)

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