Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

...my Stuff > 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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the purpose of the atomizer?

A

Divides the fuel oil into fine particles for combustion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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 fuel oil spray

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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 open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

Mechanical and steam atomizers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the five advantages of steam atomization?

A 
High turndown ratio
Cleaner burning of residual fuel
Less fireside deposits 
Better combustion in a cold furnace 
Wilder range at lower pressures
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How must atomizer sprayer plates be stored?

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

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

A

15 minutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How are atomizer sprayer plate orifices checked for proper size?

A

With a GO/NO-GO gage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is used to clean atomizer sprayer plates?

A

Wood cleaning sticks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

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

A

Engineering officer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

Every 1800 hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the two principal parts of an air register?

A

The diffuser and the air foils

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the purpose of the diffuser?

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the two types of safety valves used?

A

Huddling chamber

Nozzle reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What causes the initial lifting of a safety valve?

A

Static pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

On a nozzle reactions safety valve the guide ring has what function?

A

To control blowdown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

Tolerance plus or minus 10 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

Between 3 and 6 percent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

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

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

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

A

Plus or minus 5 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

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

A

Those guidelines as established by the planned maintenance system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

soot blowers now in service may be classified into what 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 reasons that soot must be removed from a boiler?

A

to prevent fires
to mainrain 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 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 system receive its air source?

A

the boiler air casing

32
Q

what is the purpose of the bilge drain valve in the soot blowing piping system?

A

to maintain continuous drainage of the system

33
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

34
Q

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

A

by means of internal hole 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 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 at 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 fogging of the glass

41
Q

gage glass 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 on the sealing surfaces to prevent leakage

43
Q

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

A

prevents the escape of hot water 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 activates 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 reason?

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 found concerning pressure ages and thermometers?

A

NSTM Chap 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 a corrugated plates that create rapid changes in direction?

A

seconddary 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 comers

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 filled 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 valve has two functions a feed stop valve or as check valve, 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 fro the surface of the water in the drum

...my Stuff (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions