Mech 3

Question 1

What pressure does the HPSWS run at

Answer 1

Maintains 7 bar to the ring main

Question 2

7 things HPSWS are used for

Answer 2

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

Question 3

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

Answer 3

MEOs because it will contaminate and corrode

Question 4

What is a ring main

Answer 4

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

Question 5

Where can pumps be operated from

Answer 5

Remote and local

Question 6

What is a riser

Answer 6

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

Question 7

What is a pump leak off

Answer 7

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

Question 8

What are the 4 things fixed firefighting sprays used for

Answer 8

-Magazines
-Funnels
-Painted lockers
-inflam stores

Question 9

What temperature does white metal melt at

Answer 9

115’c

Question 10

What does MARPOL stand for

Answer 10

Maritime pollution regulations

Question 11

What does the main propulsion circulation system cover

Answer 11

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

Question 12

What does the Auxiliary circulation system do

Answer 12

Cools ACP(air conditioning plant) and diesel generators

Question 13

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

Answer 13

Isolate strainer n Cross connect to opposite side

Question 14

Sea water and fresh water are

Answer 14

Sw-open
Fw-closed

Question 15

2 reasons to use fresh water over sw

Answer 15

Less corrosive
Less contamination

Question 16

3 reasons you Cannot discharge oil unless

Answer 16

-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

Question 17

In antartic what oil can u discharge

Answer 17

None

Question 18

State 1 is

Answer 18

All pumps are operating
Valves shut
HPSWM divided into zones

Question 19

Most common type of oily contamination are in

Answer 19

Bilges
Fuel system
Oil system
Cpp

Question 20

What separates oil n water

Answer 20

Oily water separator

Question 21

Minimise oil in bilge

Answer 21

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

Question 22

What does a VPS use

Answer 22

Electric pump
Manifold
Hoses

Question 23

What is black water

Answer 23

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

Question 24

Who tell if oil spill

Answer 24

OOD OOW

Question 25

What is grey water

Answer 25

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

Question 26

Discharge within 0-4 nm

Answer 26

IMO approved stp

Question 27

Discharge at 4-12nm

Answer 27

IMO approved system which allows you to dilute sewage

Question 28

Over 12nm

Answer 28

No treatment needed

Question 29

What does a sullage system do

Answer 29

Retains dirty oil/fuel until shoreside

Question 30

2 ways to empty bilge

Answer 30

Bilge system Sullage system

Question 31

What does a bilge/salvage educator do

Answer 31

Remove fluid from bildge

Question 32

What are STPs health hazards

Answer 32

Typhoids,hepatitis,bad stomach

Question 33

2 types of stps types

Answer 33

Biological,collect,hold and transfer

Question 34

Dangers of bilge and sullage systems

Answer 34

Fire Hydrogen sulphide

Question 35

Advantages of sewage plant

Answer 35

-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

Question 36

How to keep bilge hazards to minimum

Answer 36

Pumping bilges regularly to stop build up in hydrogen sulphide

Question 37

Aerobic is air but anaerobic is

Answer 37

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

Question 38

What monitors gas levels in stps

Answer 38

Leader gas monitor

Question 39

Aerobic will stop when

Answer 39

Compressor fails

Question 40

State 3

Answer 40

1 pump running Rest on standby Valves open

Question 41

Collection tanks hold sewage for

Answer 41

24 hours

Question 42

Holding tanks can hold sewage for

Answer 42

12 days

Question 43

What does a transfer pump do

Answer 43

Takes sewage from collection tank to holding tank

Question 44

VPS is used to transfer

Answer 44

Grey water and black water to shore side facility

Question 45

Sewage hoses must be kept separate from

Answer 45

Grey water

Question 46

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

Answer 46

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

Question 47

How do you monitor the hydrogen sulphide in a tank

Answer 47

Leader gas monitor

Question 48

Hazards with operating sewage plants

Answer 48

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

Question 49

20-30ppm 150-400 ppm 1000ppm

Answer 49

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

Question 50

HP air and LP run at what bar

Answer 50

HP - 276 LP - 8

Question 51

What 8 things can HP air be used for

Answer 51

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

Question 52

What bar does the 1 stage run at

Answer 52

4 bar

Question 53

What bar does stage 2 run at

Answer 53

17.5

Question 54

What bar does stage 3 run at

Answer 54

68

Question 55

What bar does stage 4 run at

Answer 55

276

Question 56

Relief valve will operate at

Answer 56

10% above set pressure

Question 57

What does the separator bottle do

Answer 57

Removes moisture and oil and will drain automatically every 30 mins

Question 58

What does a safety valve do

Answer 58

Runs at 3.5 bar and protects cooling system from over pressuring

Question 59

what are the 4 stages of relief valve

Answer 59

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

Question 60

What is dieseling

Answer 60

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

Question 61

What to do when operating flexible hoses

Answer 61

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

Question 62

What to do when bottle charging (4)

Answer 62

-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

Question 63

When working on HP air what to do(4)

Answer 63

-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

Question 64

What to do when repairing HP air compressor

Answer 64

-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

Question 65

What would u do if strainer on common rail becomes blocked

Answer 65

Isolate the strainer and cross connect to other strainer

Question 66

How to Operate educator

Answer 66

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

Question 67

Advantages of compressed air

Answer 67

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

Question 68

Hazards working with hp and lp air

Answer 68

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