Ventilation

Question 1

What are the uses of ventilation?

Answer 1

1) Cooling of electronic equipment.
2) Main machinery space cooling
3) Habitability
4) Galley ventilation
5) CBRN

Question 2

What are the four basic configurations of ventilation?

Answer 2

1) Fan supply and fan exhaust
2) Fan supply and natural exhaust
3) Natural supply and fan exhaust
4) Natural supply and natural exhaust

Question 3

What type of ventilation would be fitted to machinery spaces, galleys, laundries, WCs and bathrooms?

Answer 3

Fan supply and fan exhaust

Question 4

What type of ventilation is used in store rooms and workshops?

Answer 4

Fan supply and natural exhaust

Question 5

What type of ventilation is used in paint stores, inflam stores and spirit rooms?

Answer 5

Natural supply and fan exhaust

Question 6

What type of ventilation is used in unoccupied compartments and lobbies?

Answer 6

Natural supply and natural exhaust

Question 7

What are the 6 types of common filters?

Answer 7

Panel filters
Supply filters
Grease filters
Lint filters
Dust filters
Flameproof gauzes

Question 8

What are the 6 certain spaces that require special filters?

Answer 8

Galleys
Store rooms
Auxiliary machinery spaces
Magazines
Paint stores
STPs

Question 9

What are the certain compartments that have fire flaps?

Answer 9

Galleys
Main machinery spaces
Magazines

Question 10

What are the requirements of the ventilation in an STP?

Answer 10

15 air changes per hour
Low level exhaust
More exhaust than supply.

Question 11

What does ATU stand for?

Answer 11

Air Treatment Unit

Question 12

What percentage of air is recirculated/fresh when using the ATU?

Answer 12

33% fresh, 67% recirculated

Question 13

What does AFU stand for?

Answer 13

Air Filtration Unit

Question 14

What CBRNDC state would an AFU be used in?

Answer 14

State 1, condition ZULU ALFA

Question 15

Describe the three stage ventilation on an AFU.

Answer 15

Pre-particulate filter - paper filter which removes course particulate matter including radioactive fallout.

Particulate filter - Glass fibre filter designed to remove bacteria by entrapment.

Gas filter - Removes all known chemical warfare agents in the form of gas/vapours by activated charcoal filling.

Question 16

What is the Citadel?

Answer 16

A whole ship CBRN shelter.
Formed by closing the ship down to increased gas tight state.
Works by increasing the atmospheric pressure using air filtered by AFU’s

Question 17

When would the citadel be tested?

Answer 17

Annually
Prior to DED
During harbour acceptance trials (HATS)
During sea acceptance trials (SATS)
During FOST work-ups

Question 18

When would an Air Bleed Valve operate?

Answer 18

When the internal pressure exceeds 2.5” WG

Question 19

Where would a crash stop be situated, when would it be used, and when would the fans be restarted.

Answer 19

Situated in SCC or HQ1.
Used in an emergency (fire or crash on deck) to shut down all ventilation fans.
Fans can only be restarted after being checked they are clear of smoke and debris.