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ESWS ENGINEERING Flashcards

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1
Q

What is the LM2500 GTE?

A

A marine propulsion engine made by General Electric

The LM2500 is specifically designed for marine applications.

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2
Q

How many GTEs are there and where are they located?

A

Total of four GTEs located at:
* 1A/1B in MER1 (4-174-0-E)
* 2A/2B in MER2 (4-254-0-E)

This indicates the distribution of engines across two different machinery spaces.

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3
Q

What type of shaft configuration does the LM2500 have?

A

A split shaft of 2 sections: gas generator and power turbine

This configuration allows for efficient operation and separation of functions.

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4
Q

What does the gas generator (GG) produce?

A

A stream of rapidly expanding hot gases

These gases drive both the gas generator itself and the power turbine.

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5
Q

What is the role of the power turbine (PT) in the LM2500?

A

Drives the output shaft which drives the reduction gear

This is essential for converting the turbine’s rotational energy into usable mechanical energy.

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6
Q

How are the gas generator and power turbine coupled?

A

Aerodynamically coupled

This design enhances efficiency and performance.

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7
Q

What are the main components of the gas generator?

A

Consists of:
* 16 stage axial flow compressors
* Annular type combustor
* Two stage high-pressure turbine (HPT)
* Accessory gearbox (AGB)

These components work together to compress air, mix it with fuel, and generate thrust.

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8
Q

How many nozzles does the LM2500 have?

A

30 nozzles

These nozzles are part of the fuel manifold system.

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9
Q

How many spark ignitors are present in the LM2500?

A

2 spark ignitors

These are necessary for initiating combustion in the engine.

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10
Q

What does S.P.A.M. stand for in the context of bleed air systems?

A

Starter Air, Prairie Air, Anti-Icing, Masker Air

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11
Q

From which stages of the gas turbine engines is bleed air extracted?

A

16th stage of the GTM and 14th stage of the GTG

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12
Q

What is the function of Starter Air in the bleed air system?

A

Used for GTM & GTG

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13
Q

What is Prairie Air used for in the bleed air system?

A

Used for propellers

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14
Q

What is the purpose of Anti-Icing air in the bleed air system?

A

Used for intakes

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15
Q

What does Masker Air refer to in the context of bleed air systems?

A

Used for the hull of the ship

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16
Q

What is the purpose of CRP?

A

To vary the angle of the propeller blades

CRP stands for Controllable Reversible Pitch

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17
Q

What is the maximum CRP range?

A

-61% astern to 120% ahead

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18
Q

What is the normal CRP range?

A

-45% to 100%

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19
Q

What types of pumps are involved in CRP?

A

Electric CRP pump and attached CRP pump

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20
Q

How many sumps are there per MER?

A

1 sump per MER

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21
Q

What does the Hydraulic Oil Power Module (HOPM) do?

A

Filters and divides oil into control oil and power oil

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22
Q

What is the function of control oil in the system?

A

Moves the piston at the OD box

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23
Q

What is the function of power oil in the system?

A

Moves the piston at the propeller hub assembly

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24
Q

What are the modes of the OD box?

A

Manual, Off, Auto

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25
What is the primary function of the MRG?
To reduce the rotating speed of the LM2500 GTE to a speed suitable for turning the ships' propellers
26
What type of speed reduction does the MRG perform?
High speed low torque to low speed high torque
27
What are the characteristics of the MRG?
* Double input * Double reduction * Double helical * Articulated * Single output * Locked train
28
What is the reduction ratio of the MRG?
21.35 to 1
29
How many bearings are used in the MRG?
30 bearings: 4 thrust and 26 journal
30
What is the purpose of the Lube Oil Service System?
Deliver clean filtered lube oil at the proper temperature and pressure to the machinery. ## Footnote Specifically, it delivers L/O 2190 TEP.
31
How many Lube Oil Service Pumps are there per main engine room (MER)?
3 L/O service pumps per MER.
32
What are the flow rates for the electric Lube Oil Service Pump?
* 318 GPM slow at 100 PSIG * 560 GPM fast at 100 PSIG * 693 GPM at 168 SRPM at 75 PSIG.
33
What is the alarm setting for the Lube Oil Filter?
Alarm at 12 PSID.
34
What temperature range does the 3-way regulating valve maintain at the MRG inlet header?
120-130°F.
35
What type of heat exchanger is used in the Lube Oil Cooler?
Shell and tube type heat exchanger using seawater as a cooling medium.
36
What type of purifiers are used in the Lube Oil Service System?
Self-cleaning purifiers.
37
How many Lube Oil Purifiers are there per main engine room (MER)?
1 per MER.
38
What is the rated capacity and back pressure for the Lube Oil Purifiers?
* Rated at 500 GPH * 15-18 PSIG back pressure.
39
What is the primary function of the L/O storage and conditioning assembly?
Filters, cools, and stores synthetic L/O MIL-23699 for the GTM
40
What is the capacity of the storage tank in the L/O storage and conditioning assembly?
40 gallon storage tank
41
What is the normal capacity range for the storage tank?
19-24 gallons
42
What engine does the Universal Engine Control (UEC) control?
LM2500
43
What information does the UEC display?
UEC status log
44
What modes can be operated in the UEC?
* Local control mode * Offline mode
45
What is one of the functionalities of the UEC regarding system checks?
Self test
46
What maintenance action can be performed on the UEC?
UEC calibration and adjustments
47
What is the primary function of the fuel oil service system?
Supplies clean, filtered fuel to all 4 GTMs and 3 GTGs ## Footnote GTM refers to Gas Turbine Module, and GTG refers to Gas Turbine Generator.
48
What type of fuel is classified as Naval Distillate?
NATO F-76
49
What is JP5 classified under?
NATO F-44
50
What is NATO F-75?
Type of fuel used in the fuel oil service system
51
How many different types of fuel tanks are there in the system?
3 different types of fuel tanks
52
List the types of fuel tanks in the fuel oil service system.
* 4 service tanks * 2 gravity feed tanks * 1 head tank
53
What are the capacities of the service tanks?
* 1A - 22K gallons * 1B - 17K gallons * 2A - 17K gallons * 2B - 22K gallons
54
What is the capacity of each gravity feed tank?
600 gallons
55
What is the capacity of the head tank for 3 GTG?
1200 gallons
56
What type of pump is used in the fuel oil service system?
Sliding vane type positive displacement
57
How many pumps are per MER?
2 pumps
58
What is the output rating of the FOSP at slow speed?
36 GPM at 105 PSIG
59
What is the output rating of the FOSP at fast speed?
72 GPM at 105 PSIG
60
What type of heat exchanger is used in the fuel oil service heater?
Shell and tube cross flow heat exchanger
61
What does the F/O prefilter do?
Removes solids from fuel down to a 15 micron size
62
What is the function of the F/O coalescer?
Removes solids and water via hydrophobic screen
63
At what pressure does the F/O unloader valve relieve?
35 PSIG
64
What color is the handwheel for the F/O unloader valve?
Yellow
65
What is the primary function of the fuel oil service system?
Supplies clean, filtered fuel to all 4 GTMs and 3 GTGs ## Footnote GTM refers to Gas Turbine Module, and GTG refers to Gas Turbine Generator.
66
What type of fuel is classified as Naval Distillate?
NATO F-76
67
What is JP5 classified under?
NATO F-44
68
What is NATO F-75?
Type of fuel used in the fuel oil service system
69
How many different types of fuel tanks are there in the system?
3 different types of fuel tanks
70
List the types of fuel tanks in the fuel oil service system.
* 4 service tanks * 2 gravity feed tanks * 1 head tank
71
What are the capacities of the service tanks?
* 1A - 22K gallons * 1B - 17K gallons * 2A - 17K gallons * 2B - 22K gallons
72
What is the capacity of each gravity feed tank?
600 gallons
73
What is the capacity of the head tank for 3 GTG?
1200 gallons
74
What type of pump is used in the fuel oil service system?
Sliding vane type positive displacement
75
How many pumps are per MER?
2 pumps
76
What is the output rating of the FOSP at slow speed?
36 GPM at 105 PSIG
77
What is the output rating of the FOSP at fast speed?
72 GPM at 105 PSIG
78
What type of heat exchanger is used in the fuel oil service heater?
Shell and tube cross flow heat exchanger
79
What does the F/O prefilter do?
Removes solids from fuel down to a 15 micron size
80
What is the function of the F/O coalescer?
Removes solids and water via hydrophobic screen
81
At what pressure does the F/O unloader valve relieve?
35 PSIG
82
What color is the handwheel for the F/O unloader valve?
Yellow
83
What is the model of the gas turbine generator mentioned?
ALLISON 501-K34
84
What type of engine is the ALLISON 501-K34?
Single shaft engine
85
How many stages does the axial flow compressor in the ALLISON 501-K34 have?
Fourteen stages
86
What is the type of combustor used in the ALLISON 501-K34?
Can-annular combustor
87
How many stages does the turbine in the ALLISON 501-K34 have?
Four stages
88
What is the rotation speed of the ALLISON 501-K34 gas turbine generator?
14340 RPM (60Hz)
89
What is the power rating of the gas turbine generator?
3000 KW
90
What is the voltage rating of the gas turbine generator?
450 VAC
91
What is the current rating of the gas turbine generator?
4811 AMPS
92
What is the phase configuration of the gas turbine generator?
3 phase
93
What is the frequency of the gas turbine generator?
60Hz
94
What is the power factor of the gas turbine generator?
0.8
95
How many poles does the gas turbine generator have?
4 poles
96
How many thermocouples does the gas turbine generator have?
12 thermocouples
97
What do the thermocouples in the gas turbine generator measure?
TIT (Turbine Inlet Temperature)
98
How many fire eyes are in the gas turbine generator module?
3 fire eyes
99
What does FADC stand for?
Full Authority Digital Control
100
What does LOCOP stand for?
Local Operating Controlling Panel
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