Ventilation

Question 1

Name five uses for ventilation

Answer 1

Cooling of electronic equipment

CBRN

Habitability

Main machinery space cooling

Galley ventilation

Question 2

Name four 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

What ventilation would be required for machinery spaces, galleys, laundries, WC and bathrooms?

Answer 3

Fan supply and fan exhaust

Question 4

What ventilation would be required for store rooms and workshops?

Answer 4

Fan supply and natural exhaust

Question 5

What ventilation would be required for paint stores, spirit rooms and inflam stores?

Answer 5

Natural supply and fan exhaust

Question 6

What ventilation is used in minor unoccupied compartments and lobbies?

Answer 6

Natural supply and natural exhaust

Question 7

Name six common filters

Answer 7

Panel filter

Supply filter

Grease filters

Lint filters

Dust filters

Flameproof gauzes

Question 8

Name the special requirements of galleys

Answer 8

Fire flaps fitted to exhaust trunking

Question 9

Name the special requirements of store rooms

Answer 9

Subject to build up of toxic fumes (CO2)

Question 10

Name the special requirements of auxiliary machinery spaces

Answer 10

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

Question 11

Name the special requirements of sewage treatment spaces

Answer 11

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 12

Name the special requirements of magazines

Answer 12

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

Question 13

Under normal conditions what ratio of air do ATU systems operate under

Answer 13

33% fresh air and 67% recirculated

Question 14

What does ATU stand for

Answer 14

Air treatment unit

Question 15

What does AFU stand for

Answer 15

Air filtration unit

Question 16

What state and condition are AFUs used in?

Answer 16

CBRNDC state 1 and condition Zulu alfa

Question 17

Which three sections do AFUs consist of?

Answer 17

Pre particulate filter

Particulate filter

Gas filter

Question 18

What is a pre particulate filter made up of?

Answer 18

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

Question 19

What is a particulate filter made up of?

Answer 19

Glass fibre, designed to remove particulate such as bacteria by entrapment

Question 20

What is a gas filter designed to do?

Answer 20

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

Question 21

The citadel is best described as

Answer 21

A whole ship chemical, biological and nuclear shelter

Question 22

How is a citadel formed

Answer 22

By closing the ship down to an increased gas tight state

Question 23

How does a citadel work

Answer 23

By increasing the atmospheric pressure within the ship above external pressure using air filtered by afu units

Question 24

How often are citadel tests carried out

Answer 24

Annually

Prior to ded

During harbour acceptance trials (hats)

During sea acceptance trials (sats)

During FOST work up

Question 25

What does a crash stop allow

Answer 25

All fans to be stopped in case of an emergency e.g. fire or crash on deck

Question 26

Following a crash stop, before any ventilation is restarted what must the vent intakes be checked for?

Answer 26

Smoke, welding fumed and debris.