Ventilation

Question 1

Uses of Ventilation

Answer 1

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

Question 2

Name all ventilation configurations

Answer 2

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

Question 3

When is Fan Supply Fan Exhaust used?

Answer 3

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

Question 4

Where is Fan Supply Fan Exhaust used?

Answer 4

Machinery spaces, Galleys, Laundries, WCs and Bathrooms

Question 5

When is Fan Supply natural exhaust used?

Answer 5

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

Question 6

Where is Fan Supply natural exhaust used?

Answer 6

Store rooms and Workshops

Question 7

When is natural supply, Fan Exhaust used?

Answer 7

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

Question 8

Where is natural supply Fan Exhaust used?

Answer 8

This is only used in minor unoccupied compartments and lobbies

Question 9

Name types of filter

Answer 9

Panel
Supply
Grease
Lint
Dust
Flameproof Gauzes

Question 10

What is a panel filter

Answer 10

Re-circulating trunking associated with air conditioning systems

Question 11

What is a supply filter?

Answer 11

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

Question 12

What is a grease filter?

Answer 12

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

Question 13

What is a Lint filter?

Answer 13

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

Question 14

What is a dust filter?

Answer 14

Fitted to computer and sonar instrument spaces and sick bays

Question 15

What is a flameproof gauze filter?

Answer 15

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

Question 16

Name all the spaces that require special filters

Answer 16

Galleys
Storerooms
Aux Machinery Spaces
Sewage Treatment Spaces
Magazines

Question 17

Special requirement of Galleys

Answer 17

· Have Fire Flaps fitted to their exhaust trunking

Question 18

Special requirement of store rooms

Answer 18

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

Question 19

Special requirement of Auxilliary machine spaces

Answer 19

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

Question 20

Special requirement of Sewege Treatment Spaces

Answer 20

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.

Question 21

Special requirement of Magazines

Answer 21

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

Question 22

ATU Air Percentages

Answer 22

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

Question 23

ATU

Answer 23

Air Treatment Unit

Question 24

AFU

Answer 24

Air Filtration Unit

Question 25

When are AFUs Used

Answer 25

CBRNDC state 1, Condition ZULU ALFA

Question 26

3 sections of AFUs

Answer 26

1. Pre particulate filter 2. Particulate filter 3. Gas filter

Question 27

What is pre particulate filter?

Answer 27

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

Question 28

What is a particulate filter

Answer 28

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

Question 29

What is a gas filter

Answer 29

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

Question 30

What is a citadel?

Answer 30

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

Question 31

How does a citadel work?

Answer 31

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

Question 32

Why are citadel tests done?

Answer 32

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

Question 33

Name all the citadel tests

Answer 33

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

Question 34

What pressure is effective for a citadel to work efficiently

Answer 34

Half inch water gauge

Question 35

Why is a crash stop facility used?

Answer 35

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.

Question 36

Why do we restart vent systems?

Answer 36

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

Question 37

Where is Crash Stop Board situated?

Answer 37

SCC