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Theory 4 > Ventilation > Flashcards

Ventilation Flashcards

1
Q

Uses of Ventilation

A

• Cooling of Electronic Equipment
• CBRN
• Habitability
• Main Machinery Space Cooling
• Galley Ventilation

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2
Q

Name all ventilation configurations

A

Fan Supply / Fan Exhaust
Fan Supply / Natural Exhaust
Natural Supply / Fan Exhaust
Natural Supply / Natural Exhaust

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3
Q

When is Fan Supply Fan Exhaust used?

A

Fitted where it is necessary to remove large quantities of Wild Heat, Moisture or Noxious Fumes

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4
Q

Where is Fan Supply Fan Exhaust used?

A

Machinery spaces, Galleys, Laundries, WCs and Bathrooms

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5
Q

When is Fan Supply natural exhaust used?

A

Fitted where the supply of fresh air to compartments is the primary objective

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6
Q

Where is Fan Supply natural exhaust used?

A

Store rooms and Workshops

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7
Q

When is natural supply, Fan Exhaust used?

A

Fitted where the removal of noxious gases and flammable vapours is the primary object.

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8
Q

Where is natural supply Fan Exhaust used?

A

This is only used in minor unoccupied compartments and lobbies

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9
Q

Name types of filter

A

Panel
Supply
Grease
Lint
Dust
Flameproof Gauzes

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10
Q

What is a panel filter

A

Re-circulating trunking associated with air conditioning systems

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11
Q

What is a supply filter?

A

Polyurethane filters fitted in ATUs between the plenum chamber and the cooler

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12
Q

What is a grease filter?

A

Fitted to exhaust canopies over deep fat fryers and ranges in galleys

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13
Q

What is a Lint filter?

A

Fitted to prevent the accumulation of fluff and fibres in the exhaust trunking of the laundry

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14
Q

What is a dust filter?

A

Fitted to computer and sonar instrument spaces and sick bays

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15
Q

What is a flameproof gauze filter?

A

Are fitted to inflammable stores, paint shops, hangers, vehicle decks and magazines

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16
Q

Name all the spaces that require special filters

A

Galleys
Storerooms
Aux Machinery Spaces
Sewage Treatment Spaces
Magazines

17
Q

Special requirement of Galleys

A

· Have Fire Flaps fitted to their exhaust trunking

18
Q

Special requirement of store rooms

A

subject to the build-up of toxic fumes (CO2) which is heavier than air.

19
Q

Special requirement of Auxilliary machine spaces

A

To prevent any build-up of gas 50% of exhaust terminals will be found at deck level.

20
Q

Special requirement of Sewege Treatment Spaces

A

These spaces require 15 air changes per hour with a separate exhaust system and a slight excess of exhaust capacity from that of the supply.

21
Q

Special requirement of Magazines

A

fitted with their own air conditioning system which allows 100% treated fresh air

22
Q

ATU Air Percentages

A

under normal conditions use 33% Fresh air and 67% Re-circulated

23
Q

ATU

A

Air Treatment Unit

24
Q

AFU

A

Air Filtration Unit

25
Q

When are AFUs Used

A

CBRNDC state 1, Condition ZULU ALFA

26
Q

3 sections of AFUs

A
  1. Pre particulate filter
  2. Particulate filter
  3. Gas filter
27
Q

What is pre particulate filter?

A

A paper filter which removes coarse particulate matter including radio-active fall-out

28
Q

What is a particulate filter

A

Made of glass fibre; designed to remove particulate such as bacteria by entrapment

29
Q

What is a gas filter

A

Designed to remove all known chemical warfare agents in the form of gases or vapours from the airstream by absorption in the activated charcoal filling

30
Q

What is a citadel?

A

whole ship chemical, biological and nuclear shelter
• Formed by closing the ship down to an increased gas tight state

31
Q

How does a citadel work?

A

works by increasing the atmospheric pressure within the ship above external pressure using air filtered by AFU units

32
Q

Why are citadel tests done?

A

For the citadel to function correctly, the gas tightness must be checked regularly, and any defects made good.

33
Q

Name all the citadel tests

A
  1. Annually
  2. Prior to DED (Docking Extended Duration)
  3. During Harbour Acceptance Trials (HATS)
  4. During Sea Acceptance Trials (SATS)
  5. All ships will be required to carry out a Citadel Test during FOST Work-up
34
Q

What pressure is effective for a citadel to work efficiently

A

Half inch water gauge

35
Q

Why is a crash stop facility used?

A

crash stop facility is built into the ventilation system to allow all fans to be stopped in case of an emergency, e.g. FIRE or CRASH ON DECK.

36
Q

Why do we restart vent systems?

A

RESTART of VENT SYSTEMS: before any ventilation is restarted the vent intakes should be checked they are clear of Smoke, Welding fumes and Debris.

37
Q

Where is Crash Stop Board situated?

A

SCC

Theory 4 (4 decks)

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