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Theory 3 Flashcards

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1
Q

What is the operating pressure of the HPSWM ring main system?

A

Approximately 7 bar

The HPSWM usually runs around 2 deck and on some types of ship 5 deck.

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2
Q

How is the HPSWM system supplied?

A

By electrically driven pumps taking suction from the sea through a strainer

Pumps can be operated locally or remotely.

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3
Q

What components maintain the pressure in the HPSWM system?

A

Relief valves and 10% leak off valves

These maintain the pressure at 7 bar.

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4
Q

List some uses of the HPSW System.

A
  • Firefighting - hydrants/sprays/centre feed hose reels
  • Pre Wetting system
  • Fitted Bilge and Salvage Eductors
  • Emergency Cooling to main propulsion gas turbines/diesel generators
  • Auxiliary Machinery cooling water system
  • Making of fresh water
  • Flushing heads (on some types of ship)
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5
Q

What is the minimum number of salt water pumps that will be in use at any time?

A

At least one pump

The others are maintained in a standby state.

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6
Q

Where can pumps be started from?

A

Locally at the pump control box or remotely from SCC or Machinery Control Room (MCR)

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7
Q

What are fixed sprays used for?

A

Firefighting in areas of high fire risk

Examples include magazines, paint lockers, inflam store, and funnel.

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8
Q

What is the purpose of pre-wetting in an NBC environment?

A

To reduce contamination levels of the upper decks

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9
Q

What does DC State 1 signify?

A

Individual HPSW pumps supply their own section of the ring main

The ring main is isolated by shutting the state valves.

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10
Q

What happens in DC State 3?

A

All main isolating/state valves are open with one pump supplying the whole system

A second pump can be started if system pressure drops.

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11
Q

What is used to cool engine coolant in the cooling systems?

A

Sea water via a heat exchanger

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12
Q

Why are fresh water circulation systems necessary?

A
  • Machinery is susceptible to salt water corrosion
  • Other equipment can be affected by salt water contamination
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13
Q

What is the melting point of white metal bearings?

A

115 degrees C

Exceeding this temperature will ‘wipe’ the bearing.

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14
Q

What systems are supplied by the Main Propulsion Cooling System?

A
  • Lub Oil Heat Exchanger
  • Gas Turbine Heat Exchanger
  • CPP unit Heat Exchanger
  • Plummer Block Heat Exchanger
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15
Q

What can the Fresh Water circulation system be cross-connected to in an emergency?

A

Salt Water with MEO permission

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16
Q

What does MARPOL stand for?

A

Maritime Pollution Regulations 1973/78

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17
Q

What is the maximum allowed oil content in discharged water within 12NM from land?

A

15ppm

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18
Q

List some special areas defined by the IMO relating to oil pollution regulations.

A
  • Baltic Sea
  • North West European Waters
  • Mediterranean Sea
  • Black Sea
  • Gulf
  • Gulf of Aden
  • Caribbean
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19
Q

What are the main sources of contamination on a ship?

A
  • Bilges
  • Fuel Systems
  • Oil Systems
  • CPP Systems
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20
Q

What is black water defined as?

A

The drainage and waste from WC’s, urinals, WC scuppers, medical compartments, and any water mixed with this waste

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21
Q

What are the discharge regulations for sewage within 4NM?

A

Discharge is only permitted with an IMO approved Sewage Treatment Plant (STP)

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22
Q

What is the definition of grey water?

A

Waste from bathrooms, galleys, dishwashers, laundries, and sinks

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23
Q

What is the function of the Vacuum Pumping System (VPS)?

A

To collect and pump all black and grey water discharges to the available shore facility

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24
Q

What is bilge water?

A

Spillage, leakage, condensation, etc., that accumulates at the bottom of the hull

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25
What is the purpose of eductors in the bilge system?
To remove quantities of fluid quickly from the bilges
26
What does the bilge system do?
Removes excess fluid from machinery space bilges, separates water from oil, and discharges oil to sullage tanks
27
What is the purpose of the sullage system?
To retain dirty or waste oil/fuel until it can be properly discharged ashore
28
What is the consequence of incorrectly operating an eductor?
The compartment will flood with sea water from the HPSWM
29
What is the main hazard associated with operating a Sewage Treatment Plant (STP)?
Hydrogen Sulphide (H2S) gas
30
What is the process called when microorganisms digest sewage?
Aerobic Digestion
31
What happens if the air supply fails in the STP?
Microorganisms die, producing Hydrogen Sulphide (H2S) gas
32
What is the storage capacity of the Collect Hold and Transfer (CHT) system?
About 12 days
33
What is the function of the ejector in the CHT system?
To aerate the sewage slightly and prevent it from turning anaerobic
34
What are the health hazards associated with raw sewage?
* Typhoid * Hepatitis * Gastro-enteritis
35
What are the two categories of High Pressure Air?
* HP air operating at 276 bar * Reduced HP air operating below 276 bar
36
What are some uses for High Pressure Air?
* Diesel engine starting * Gas turbine starting * Ship siren operation * Breathing apparatus charging * Weapon systems operation * Hydraulic system accumulator charging * Air driven machinery operation
37
What is the first stage pressure of the HPAC?
4 bar
38
What happens after each stage of compression in the HPAC?
Air is cooled by intercoolers (sea water cooled heat exchangers)
39
What is the pressure relief valve setting for the first stage of the HPAC?
4.4 bar
40
What is the pressure at Stage 3 of the compressor?
68 bar
41
What is the pressure at Stage 4 of the compressor?
276 bar
42
What happens every 30 minutes in the compressor system?
Automatic draining occurs
43
What is the first pressure relief valve (PRV) setting?
4.4 bar
44
What is the second pressure relief valve (PRV) setting?
19.25 bar
45
What is the third pressure relief valve (PRV) setting?
74.9 bar
46
What is the fourth pressure relief valve (PRV) setting?
303.6 bar
47
What temperature does the high water temperature switch operate at?
54 degrees C
48
At what pressure does the low oil pressure switch operate?
0.69 bar
49
What is the purpose of the water jacket safety valve?
Protects the FW cooling system and SW main
50
What is the maximum pressure for LP Air?
8 bar
51
What are the uses of LP Air? List at least three.
* Pneumatic Tools * Radar wave guides * Emergency Stern Seal inflation * Pneumatic Surveillance Panels
52
True or False: High pressure air can be lethal if directed towards the body.
True
53
What must be worn when working with high pressure air?
Ear defenders
54
What can happen if small amounts of oil or grease come into contact with high pressure air?
Explosion (Dieseling)
55
What type of grease is used to prevent 'Dieseling'?
Silicone Grease
56
What must be done to flexible hoses to secure both ends?
Hoses must be 'whipped' (bound and tied)
57
What does it mean that hoses are 'lifed'?
They are generally dated with an expiry date
58
What is the first requirement for safe working practice when filling air bottles?
Bottle must be located in purpose built rack
59
What PPE is required when charging air bottles from HP air? List at least two items.
* Goggles * Ear Defenders
60
What should be used to ensure hoses are in good condition when filling air bottles?
Correct spanner
61
Fill in the blank: A good condition _______ must be used when filling air bottles.
O Seal
62
What should be done to avoid overheating when filling air bottles?
Bottle should be filled slowly
63
Why is it important to keep bilges empty?
To prevent the build-up of oil, fuel, or water, which can pose a fire, flood, or pollution hazard. Full bilges can mask leaks and compromise safety and environmental standards.
64
What is the Bilge?
The bilge is the lowest part of a ship’s hull where unwanted water, oil, or other fluids collect.
65
What is the bilge system?
It’s a piping and pump system designed to remove unwanted liquids from the bilge compartments to maintain cleanliness and stability and prevent hazards.

ETICC (2 decks)

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