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Mechanical 3 > Mech 3 > Flashcards

Mech 3 Flashcards

1
Q

What pressure does the HPSWS run at

A

Maintains 7 bar to the ring main

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2
Q

7 things HPSWS are used for

A

-Pre wetting system
-Firefighting
-Emergency cooling to gas turbine/diesel
-auxiliary cooling system
-making of fresh water
-flushing
-bilge educator

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3
Q

WHO’s permission do you need to use emergency cooling and why

A

MEOs because it will contaminate and corrode

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4
Q

What is a ring main

A

A ring of pipework going around 2 deck that is divided by isolation valves

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5
Q

Where can pumps be operated from

A

Remote and local

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6
Q

What is a riser

A

Allows you to take a substance from lower deck to higher deck

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7
Q

What is a pump leak off

A

To prevent over pressurisation and will leak off at 10% above 7 bar

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8
Q

What are the 4 things fixed firefighting sprays used for

A

-Magazines
-Funnels
-Painted lockers
-inflam stores

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9
Q

What temperature does white metal melt at

A

115’c

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10
Q

What does MARPOL stand for

A

Maritime pollution regulations

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11
Q

What does the main propulsion circulation system cover

A

-Gas turbine cooling
-plumber block
-forced lub oil system
-CPP

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12
Q

What does the Auxiliary circulation system do

A

Cools ACP(air conditioning plant) and diesel generators

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13
Q

If sea strainer on common rail becomes blocked on one side what do u do

A

Isolate strainer n Cross connect to opposite side

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14
Q

Sea water and fresh water are

A

Sw-open
Fw-closed

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15
Q

2 reasons to use fresh water over sw

A

Less corrosive
Less contamination

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16
Q

3 reasons you Cannot discharge oil unless

A

-ship is underway
-oil content in the effluent without dilution does not exceed 15ppm
-ship has in operation an oily watering separating filter with automatic stopping device

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17
Q

In antartic what oil can u discharge

A

None

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18
Q

State 1 is

A

All pumps are operating
Valves shut
HPSWM divided into zones

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19
Q

Most common type of oily contamination are in

A

Bilges
Fuel system
Oil system
Cpp

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20
Q

What separates oil n water

A

Oily water separator

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21
Q

Minimise oil in bilge

A

Keep machinery clean
Monitor tanks
No surfactants used
AFFF only in real tasks
Educators maintain and manned
Maximise use of shoreside facilities

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22
Q

What does a VPS use

A

Electric pump
Manifold
Hoses

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23
Q

What is black water

A

Drainage and waste from wcs,urinals,wc suppers and medical compartments

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24
Q

Who tell if oil spill

A

OOD OOW

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25
Q

What is grey water

A

Bathrooms,galleys,dishwashers,laundry and sinks and can be ditched anywhere

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26
Q

Discharge within 0-4 nm

A

IMO approved stp

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27
Q

Discharge at 4-12nm

A

IMO approved system which allows you to dilute sewage

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28
Q

Over 12nm

A

No treatment needed

29
Q

What does a sullage system do

A

Retains dirty oil/fuel until shoreside

30
Q

2 ways to empty bilge

A

Bilge system
Sullage system

31
Q

What does a bilge/salvage educator do

A

Remove fluid from bildge

32
Q

What are STPs health hazards

A

Typhoids,hepatitis,bad stomach

33
Q

2 types of stps types

A

Biological,collect,hold and transfer

34
Q

Dangers of bilge and sullage systems

A

Fire
Hydrogen sulphide

35
Q

Advantages of sewage plant

A

-Reduce number of side ship openings
-simplify pipe run
-heads lower in ship
-heads can be used in dry dock
-can be operated in anti-pollution area
-easier to close down in CBRN conditions

36
Q

How to keep bilge hazards to minimum

A

Pumping bilges regularly to stop build up in hydrogen sulphide

37
Q

Aerobic is air but anaerobic is

A

No air which causes build up in hydrogen sulphide and if exposed to much to hydrogen sulphide can lead to death

38
Q

What monitors gas levels in stps

A

Leader gas monitor

39
Q

Aerobic will stop when

A

Compressor fails

40
Q

State 3

A

1 pump running
Rest on standby
Valves open

41
Q

Collection tanks hold sewage for

A

24 hours

42
Q

Holding tanks can hold sewage for

A

12 days

43
Q

What does a transfer pump do

A

Takes sewage from collection tank to holding tank

44
Q

VPS is used to transfer

A

Grey water and black water to shore side facility

45
Q

Sewage hoses must be kept separate from

A

Grey water

46
Q

VPS requires how many people and who runs it and how long

A

-20 personnel
-3 hours
-Run by ME compartment and supervised by hull SR

47
Q

How do you monitor the hydrogen sulphide in a tank

A

Leader gas monitor

48
Q

Hazards with operating sewage plants

A

-dangerous chemicals
-raw sewage-typhoid,hepatitis and bad stomach
-dangerous gases

49
Q

20-30ppm
150-400 ppm
1000ppm

A

-sweet
-loss of smell,dizziness and breathing difficulties
-death

50
Q

HP air and LP run at what bar

A

HP - 276
LP - 8

51
Q

What 8 things can HP air be used for

A

-Diesel generators starting
-gas turbine starting
-ship siren
-BA charging
-weapon system
-Hydraulic system
-air driven machinery
-cross connection to LP

52
Q

What bar does the 1 stage run at

A

4 bar

53
Q

What bar does stage 2 run at

A

17.5

54
Q

What bar does stage 3 run at

A

68

55
Q

What bar does stage 4 run at

A

276

56
Q

Relief valve will operate at

A

10% above set pressure

57
Q

What does the separator bottle do

A

Removes moisture and oil and will drain automatically every 30 mins

58
Q

What does a safety valve do

A

Runs at 3.5 bar and protects cooling system from over pressuring

59
Q

what are the 4 stages of relief valve

A

1-4.4
2-19.25
3-74.9
4-303.6

60
Q

What is dieseling

A

Increase in pressure with oil,fuel and grease causing an explosion

61
Q

What to do when operating flexible hoses

A

-Must be connected at each end
-screw connections must be free from oil and grease
-don’t point at people or use for washing

62
Q

What to do when bottle charging (4)

A

-Purpose made rack
-wear goggles and use ear defenders
-charge slowly to stop over heating
-bottle connected to charging hose with correct use of spanner

63
Q

When working on HP air what to do(4)

A

-2 isolating valves in each supply to be closed
-continuously monitor system for build up in pressure
-drain compressor of all pressure
-check that system down stream of isolation valve is drained

64
Q

What to do when repairing HP air compressor

A

-isolate and tag out all electrical supplies to compressor
-isolate and tag out cooling water system
-drain compressor of all water
-isolate and tag out air discharge valve
-drain compressor of all air pressure

65
Q

What would u do if strainer on common rail becomes blocked

A

Isolate the strainer and cross connect to other strainer

66
Q

How to Operate educator

A

1-open dob valve
2-open motive water valve
3-open bilge suction valve

67
Q

Advantages of compressed air

A

Easily distributed throughout ship
Can be easily stored
Flexible and reliable
Low risk of fire

68
Q

Hazards working with hp and lp air

A

HP pointed at body can be lethal
Ear defenders
Hoses are lifed
Flexible hoses must be whipped

Mechanical 3 (1 decks)

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