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Ohyouknow > Main Propulsion Boilers And Fittings > Flashcards

Main Propulsion Boilers And Fittings Flashcards

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
Q

What must be done when safety valves are accidentally lifted by water during boiler hydrostatic testing?

A

They shall be tested to ensure proper operation

26
Q

Spot blowers now in service may be classified into what two general types

A

Rotary and stationary

27
Q

The accumulation of heavy fireside deposits can be significantly reduced by what?

A

Frequent use of soot blowers

28
Q

What are the three reason that soot must be removed from a boiler?

A

To prevent fires
To maintain excellent heat transfer rates
To prevent the formation of sulfuric acid which occurs when soot and moisture combine

29
Q

What is the reason for operating the soot blowers in a proper sequence?

A

To sweep the soot toward the uptakes

30
Q

What is the only authority that can approve the blanking of soot blowers?

A

NAVSEA

31
Q

What is the purpose of the scavenging air connection located on the soot blower head?

A

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
Q

Where does the scavenging air system receive its air source?

A

The boiler air casing

33
Q

What is the purpose of the bilge drain valve in the pot blower piping system?

A

To maintain continuous drainage of the system

34
Q

How is the continuous drainage of the soot blower piping system accomplished?

A

By means of internal hold drilled in the body or seat of the bilge drain valve

35
Q

What is the size of the internal drain hole on the soot blower bilge drain valve on 1200 psig systems?

A

1/16 inch

36
Q

What is the bilge drain hole size on soot blower systems that operate 600 psig or below?

A

1/8 inch

37
Q

Soot blower piping systems must be warmed up sufficiently to prevent what?

A

Piping failure

38
Q

What is the purpose of the nozzles on the soot blower element?

A

To direct the jets of steam so that they sweep around the tubes, thus preventing direct impingement

39
Q

What is the purpose of the cams on the soot blower head?

A

To control the blowing arc of the soot blower element

40
Q

A broken mica on the gage glass must be replaced at first opportunity to prevent what?

A

Rapid digging of the glass

41
Q

Gage glasses in stowage shall be kept out of contact with what?

A

Iron or steel to prevent the scratching of the finely polished glass

42
Q

Why must a predetermined tightening sequence be used when tightening the gage glass studs?

A

To provide a uniform compression the sealing surface to prevent leakage

43
Q

Why is a ball check valve installed in the bottom cutout valve is the gage glass?

A

Prevents the escape of hot air aged in case the gage glass breaks

44
Q

Over tightening of the gage glass studs can have what detrimental effect?

A

Cracking of the cone washers

45
Q

What is installed on the boiler to allow the operators to observe the water level from their watch stations?

A

Remote water level indicators

46
Q

The majority of ships have two remote water level indicators that are designed in what manner?

A

Primary and secondary

47
Q

The primary water level indicator the high and low water alarms and generates an electrical signal that is proportional to what?

A

Water level

48
Q

Smoke periscopes are fitted on naval boilers for what reasons?

A

To observe the quality of the combustion gases passing through the uptakes

49
Q

If mercury filled thermometers are being used in the fire room, what action must be taken?

A

They must be removed and replaced when possible

50
Q

Where can specific information be forums concerning pressure ages and thermometers?

A

NSTM CHAPTER 504

51
Q

What is the purpose of the boiler internal feed water pipe?

A

To distribute feed water evenly throughout the steam drum

52
Q

The first stage in the separation of steam and water in a CE boiler is accomplished by what?

A

Primary separators

53
Q

What component separates the steam and water mixture by a series of corrugated plates that create rapid changes in direction?

A

Secondary separators

54
Q

Where is the desuperheater normally located?

A

Either the steam drum or water drum

55
Q

What is the purpose of the desuperheater?

A

To reduce the temperature of a portion of the superheated steam to be used in auxiliary steam systems

56
Q

What is the function of the dry pipe in the steam drum?

A

This is where the final separation of steam and moisture occurs, which is accomplished by one quick rapid change in direction

57
Q

What purpose does the vortex eliminator serve in the steam drum?

A

Reduces the swirling motion of the water as it enters the down comets

58
Q

What is the purpose of the boiler air cock valves?

A

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
Q

What is meant by the term stop-check valve?

A

The valves has two functions a feed stop valve or as a check valves, depending on the position of the valve stem

60
Q

What is the frequency of blowing tubes on a steaming boiler?

A

At least every 168 steaming hours
Prior to entering port
After leaving port
As soon as possible after a heavy black smoke condition

61
Q

The surface blow pipe in the steam drum has what function

A

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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