Ventilation

Question 1

What are the uses of a ventilation system

Answer 1

Cooling of electronic equipment 
CBRN
Habitability 
Main Machinery Space cooling 
Galley ventilation

Question 2

What are the different configurations of ventilation

Answer 2

Fan supply and fan exhaust
Fan supply and natural exhaust
Natural supply and fan exhaust Natural supply and natural exhaust

Question 3

When is a fan supply and fan exhaust fitted

Answer 3

Where it is necessary to remove large quantities of wild heat,moisture or noxious fumes coupled with the requirement to provide fresh air to personnel working in the compartment

Question 4

When is a fan supply and natural exhaust fitted

Answer 4

Where the supply of fresh air to compartments is the primary objective

Question 5

When is a Natural supply and fan exhaust fitted

Answer 5

Where the removal of noxious gases and flammable vapours is the primary object

Question 6

When is the natural supply and natural exhaust fitted

Answer 6

Used in minor unoccupied compartments and lobbies

Question 7

What are the different filters and where are they used

Answer 7

Panel filter - Re-circulating trunking associated with air conditioning systems
Supply filter - polyurethane filters fitted in ATUs between the plenum chamber and cooler
Grease filter - fitted to exhaust canopies over deep fat fryers and ranges in galleys
Lint filter - fitted to prevent the accumulation of fluff and fibres in exhaust trunking of the laundry
Dust filters - fitted to computer and sonar instrument spaces and sick bays
Flameproof gauzes - are fitted to inflam stores, paint shops, hangers, vehicle decks and magazines

Question 8

What spaces require special filters

Answer 8

Galleys 
Store rooms 
Auxiliary machinery spaces 
Magazines 
Paint stores

Question 9

What compartments have fire flaps built into the exhaust trunking

Answer 9

Galleys
Main machinery spaces
Magazines

Question 10

What does ATU stand for

Answer 10

Air Treatment Unit

Question 11

What does AFU stand for

Answer 11

Air Filtration Unit

Question 12

What are the different percents of air used in the ATU systems

Answer 12

33% fresh air

67% Re-Circulated

Question 13

When are AFUs used

Answer 13

I’m CBRNDC state 1, condition ZULU ALFA

Question 14

What are the three sections of the AFU

Answer 14

Pre-particulate filter
Particulate filter
Gas filter

Question 15

When are citadel tests carried out

Answer 15

Annually
Prior to DED (Docking Extended Duration) to locate leaks and ensure that those beyond the capacity of ships staff are included in the defect list
During Harbour Acceptance Trials (HATS)
During sea acceptance Trials (SATS)
All ships will be required to carry out a Citadel test during FOST work-up

Question 16

What must be done so that the the citadel test functions correctly

Answer 16

Gas tightness must be checked regularly, and any defects made good

Question 17

What does a crash stop facility do

Answer 17

Built into the ventilation system to allow all fans to be stopped in case of an emergency

Question 18

What should be done before restarting any ventilation

Answer 18

The vent intakes should be checked that they are clear of smoke, welding fumes and debris