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Main Propulsion Boilers And Fittings Flashcards

(61 cards)

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1
Q

What are the two main components of an oil burner?

A

The atomizer assembly and the air register assembly

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2
Q

What is the purpose of the atomizer?

A

Divides the fuel into fine particles for combustion

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3
Q

What is the purpose of the air register?

A

The air register admits combustion air to the furnace and helps mix the air and the fuel oil spray

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4
Q

What function does the safety shutoff device serve?

A

Prevents oil spillage when an atomizer assembly is removed from a burner while the burner root valve is still open

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5
Q

What are the two types of atomizers used with main propulsion boilers?

A

Mechanical and steam atomizers

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6
Q

What are the five advantages of steam atomization?

A
  • high turndown ration
  • cleaner burning of residual fuel
  • less fireside deposits
  • better combustion in a cold furnace
  • wider range at lower pressures
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7
Q

How much atomizer sprayer plates be stored?

A

In their storage tray with a light coat of lubricating oil applied to prevent corrosion

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8
Q

How long must the atomizer barrel be cooled after removal from the burner assembly before disassembly?

A

15 minutes

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9
Q

How are atomizer sprayer plate orifices checked for proper size?

A

With a GO/NO-GO gage

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10
Q

What is used to clean atomizer sprayer plates?

A

Wood cleaning sticks

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11
Q

Who shall make frequent inspections to ensure that sprayer plates and nozzles are in good conditions?

A

Engineering officer

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12
Q

What is the normal dismantling period to rebuild a safety shutoff device?

A

Every 1800 hours

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13
Q

What are the two principal parts of an air register?

A

The diffuser and the air foils

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14
Q

What is the purpose of the diffuser?

A

The diffuser provides primary mixing of the fuel droplets with air and prevents owing the flame away from the atomizer

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15
Q

What are the two types of safety valves used onboard naval vessels?

A

Huddling chamber

Nozzle reaction

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16
Q

What causes the initial lifting of a safety valve?

A

Static pressure

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17
Q

On the nozzle reaction safety valve the guide ring has what function?

A

To control blowdown

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18
Q

What is the function of the nozzle ring on a nozzle reaction safety valve?

A

To control the sharpness of the valve opening and closing

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19
Q

Safety valves on 1200 psig boilers have a lifting pressure tolerance of what?

A

Tolerance plus or minus 10 psig

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20
Q

All safety valves installed onboard naval vessel have a blowdown range of what?

A

Blowdown range shall be between 3 and 6 percent

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21
Q

When shall safety valve gages be placed on the boiler prior to setting safeties?

A

When steam drum pressure is 100 to 200 psi below the lowest safety valve setting, or 75 percent of working pressure, whichever is higher

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22
Q

What is the lifting tolerance for safety valves installed on 600 psig boilers?

A

Plus or minus 5 psig

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23
Q

If the safety valves of any boiler cannot be adjusted to lift within the prescribed range, what action must be taken?

A

The boiler shall not be used for steaming until the fault has been corrected

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24
Q

All safety valves of each boiler shall be tested annually in accordance with what guidelines?

A

Those guidelines are established by the planned maintenance system

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25
What must be done when safety valves are accidentally lifted by water during boiler hydrostatic testing?
They shall be tested to ensure proper operation
26
Spot blowers now in service may be classified into what two general types
Rotary and stationary
27
The accumulation of heavy fireside deposits can be significantly reduced by what?
Frequent use of soot blowers
28
What are the three reason that soot must be removed from a boiler?
To prevent fires To maintain excellent heat transfer rates To prevent the formation of sulfuric acid which occurs when soot and moisture combine
29
What is the reason for operating the soot blowers in a proper sequence?
To sweep the soot toward the uptakes
30
What is the only authority that can approve the blanking of soot blowers?
NAVSEA
31
What is the purpose of the scavenging air connection located on the soot blower head?
Supplies air to the soot blower element to prevent the combustion gases from backing up into the soot blower head or the steam piping
32
Where does the scavenging air system receive its air source?
The boiler air casing
33
What is the purpose of the bilge drain valve in the pot blower piping system?
To maintain continuous drainage of the system
34
How is the continuous drainage of the soot blower piping system accomplished?
By means of internal hold drilled in the body or seat of the bilge drain valve
35
What is the size of the internal drain hole on the soot blower bilge drain valve on 1200 psig systems?
1/16 inch
36
What is the bilge drain hole size on soot blower systems that operate 600 psig or below?
1/8 inch
37
Soot blower piping systems must be warmed up sufficiently to prevent what?
Piping failure
38
What is the purpose of the nozzles on the soot blower element?
To direct the jets of steam so that they sweep around the tubes, thus preventing direct impingement
39
What is the purpose of the cams on the soot blower head?
To control the blowing arc of the soot blower element
40
A broken mica on the gage glass must be replaced at first opportunity to prevent what?
Rapid digging of the glass
41
Gage glasses in stowage shall be kept out of contact with what?
Iron or steel to prevent the scratching of the finely polished glass
42
Why must a predetermined tightening sequence be used when tightening the gage glass studs?
To provide a uniform compression the sealing surface to prevent leakage
43
Why is a ball check valve installed in the bottom cutout valve is the gage glass?
Prevents the escape of hot air aged in case the gage glass breaks
44
Over tightening of the gage glass studs can have what detrimental effect?
Cracking of the cone washers
45
What is installed on the boiler to allow the operators to observe the water level from their watch stations?
Remote water level indicators
46
The majority of ships have two remote water level indicators that are designed in what manner?
Primary and secondary
47
The primary water level indicator the high and low water alarms and generates an electrical signal that is proportional to what?
Water level
48
Smoke periscopes are fitted on naval boilers for what reasons?
To observe the quality of the combustion gases passing through the uptakes
49
If mercury filled thermometers are being used in the fire room, what action must be taken?
They must be removed and replaced when possible
50
Where can specific information be forums concerning pressure ages and thermometers?
NSTM CHAPTER 504
51
What is the purpose of the boiler internal feed water pipe?
To distribute feed water evenly throughout the steam drum
52
The first stage in the separation of steam and water in a CE boiler is accomplished by what?
Primary separators
53
What component separates the steam and water mixture by a series of corrugated plates that create rapid changes in direction?
Secondary separators
54
Where is the desuperheater normally located?
Either the steam drum or water drum
55
What is the purpose of the desuperheater?
To reduce the temperature of a portion of the superheated steam to be used in auxiliary steam systems
56
What is the function of the dry pipe in the steam drum?
This is where the final separation of steam and moisture occurs, which is accomplished by one quick rapid change in direction
57
What purpose does the vortex eliminator serve in the steam drum?
Reduces the swirling motion of the water as it enters the down comets
58
What is the purpose of the boiler air cock valves?
The air cock allows air to escape when the boiler is being fulfilled and when steam is first forming; it also allows air to enter the steam drum when. The boiler is being emptied
59
What is meant by the term stop-check valve?
The valves has two functions a feed stop valve or as a check valves, depending on the position of the valve stem
60
What is the frequency of blowing tubes on a steaming boiler?
At least every 168 steaming hours Prior to entering port After leaving port As soon as possible after a heavy black smoke condition
61
The surface blow pipe in the steam drum has what function
When the surface blow valve is open, this pipe carries off scum and foam from the surface of the water in the drum

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