Ventilation Flashcards
Name five uses for ventilation
Cooling of electronic equipment
CBRN
Habitability
Main machinery space cooling
Galley ventilation
Name four configurations of ventilation
Fan supply and fan exhaust
Fan supply and natural exhaust
Natural supply and fan exhaust
Natural supply and natural exhaust
What ventilation would be required for machinery spaces, galleys, laundries, WC and bathrooms?
Fan supply and fan exhaust
What ventilation would be required for store rooms and workshops?
Fan supply and natural exhaust
What ventilation would be required for paint stores, spirit rooms and inflam stores?
Natural supply and fan exhaust
What ventilation is used in minor unoccupied compartments and lobbies?
Natural supply and natural exhaust
Name six common filters
Panel filter
Supply filter
Grease filters
Lint filters
Dust filters
Flameproof gauzes
Name the special requirements of galleys
Fire flaps fitted to exhaust trunking
Name the special requirements of store rooms
Subject to build up of toxic fumes (CO2)
Name the special requirements of auxiliary machinery spaces
To prevent build up of gas, 50% of exhaust terminals will be found at deck level
Name the special requirements of sewage treatment spaces
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
Name the special requirements of magazines
Fitted with their own air conditioning system which allows 100% treated fresh air
Under normal conditions what ratio of air do ATU systems operate under
33% fresh air and 67% recirculated
What does ATU stand for
Air treatment unit
What does AFU stand for
Air filtration unit
What state and condition are AFUs used in?
CBRNDC state 1 and condition Zulu alfa
Which three sections do AFUs consist of?
Pre particulate filter
Particulate filter
Gas filter
What is a pre particulate filter made up of?
A paper filter which removes coarse particulate matter including radio active fall out
What is a particulate filter made up of?
Glass fibre, designed to remove particulate such as bacteria by entrapment
What is a gas filter designed to do?
Remove all known chemical warfare agents in the form of gases or vapours from the airstream by absorption in the activated charcoal filling
The citadel is best described as
A whole ship chemical, biological and nuclear shelter
How is a citadel formed
By closing the ship down to an increased gas tight state
How does a citadel work
By increasing the atmospheric pressure within the ship above external pressure using air filtered by afu units
How often are citadel tests carried out
Annually
Prior to ded
During harbour acceptance trials (hats)
During sea acceptance trials (sats)
During FOST work up
What does a crash stop allow
All fans to be stopped in case of an emergency e.g. fire or crash on deck
Following a crash stop, before any ventilation is restarted what must the vent intakes be checked for?
Smoke, welding fumed and debris.
