Ventilation Flashcards
What are the uses of Ventilation?
There are 5 uses in total
-Cooling of electronic equipment
-CBRN
-Habitability
-Main Machinery Space Cooling
-Galley Ventilation
What are the different configurations of Ventilation?
There are 4 different configurations
-Fan Supply and Fan Exhaust
-Fan Supply and Natural Exhaust
-Natural Supply and Fan Exhaust
-Natural Supply and Natural Exhaust
Where is Fan Supply and Fan Exhaust fitted and why is it fitted there?
Where: Machinery Spaces, Galley, Laundries, WCs and Bathrooms
Why: Fitted when necessary to remove large quantities of Wild Heat, Moisture or Noxious Fumes as well as providing Fresh Air to the the personnel in the compartment
Where is Fan Supply and Natural Exhaust fitted and why is it fitted there?
Where: Store Rooms and Workshops
Why: Fitted when supply of fresh air to the compartment is the primary objective
Where is Natural Supply and Fan Exhaust fitted and why is it fitted there?
Where: Paint Stores, Spirit Rooms, Inflam Stores
Why: Fitted when the removal of Noxious Gases and Flammable Vapours is the primary objective
Where is Natural Supply and Natural Exhaust fitted?
Where: Minor Unoccupied Compartments and Lobbies
Name the differnt types of common filters
There are 6 types of common filters
-Panel Filter
-Supply Filters
-Grease Filters
-Lint Filters
-Dust Filters
-Flameproof Gauzes
Describe the Panel Filter
Re-Circulating trunking associated with air conditioning systems
Describe the Supply Filters
Polyurethane filters fitted in ATUs between the plenum chamber and the cooler
Describe the Grease Filters
Fitted to exhaust canopies over deep fat fryers and ranges in the galley
Describe the Lint Filters
Fitted to prevent the accumulation of fluff and fibres in the exhaust trunking of the laundry
Describe the Dust Filters
Fitted to computer and sonar instrument spaces and sick bays
Describe the Flameproof Gauzes
Fitted to Inflam Stores, Paint Lockers, Hangers, Vehicle Decks and Magazines
What areas have Special Ventilation Requirements?
There are 5 areas
-Galleys
-Store Rooms
-Auxiliary Machinery Spaces
-Sewage Treatment Spaces
-Magazines
Why do Galleys have Special Ventilation Requirements?
Fire Flaps are fitted to their trunking due to the risk of fires from deep fat fryers
Why do Store Rooms have Special Ventilation Requirements?
They are subject to the build up of toxic fumes (CO2), which is heavier than air
Why do Auxiliary Machinery Spaces have Special Ventilation Requirements?
To prevent any build up of gas, 50% of exhaust terminals will be found at deck level
Why do Sewage Treatment Spaces have Special Ventilation Requirements?
These spaces require 15 air changes per hour with a seperate exhaust system, and a slight excess of exhaust capacity from the supply
Why do Magazines have Special Ventilation Conditions?
They are fitted with their own air conditioning system, which allows for 100% treated fresh air
What does ATU stand for?
Air Treatment Unit
What does AFU stand for?
Air Filtration Unit
When are AFUs used?
They are used in a CBRNDC State 1 environment, Condition Zulu Alpha
What sections do AFUs consist of?
There are 3 sections
-Pre-Particulate Filter
-Particulate Filter
-Gas Filter
Describe the Pre-Particulate fiter
A paper filter which removes coarse particle matter, including radio-active fall-out
Describe the Particulate filter
Made of glass fibre; designed to remove paticulate such as bacteria by entrapment
Describe the Gas Filter
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
When are Citadel tests carried out?
There are 5 occasions
-Annually
-Prior to DED (Docking Extended Duration)
-During HATs (Harbour Acceptance Trials)
-During SATs (Sea Acceptance Trials)
-During FOST Work-Up
What does a Citadel need to be sealed to?
A pressure of 2” WG
What is a Crash Stop?
A Crash Stop facility is built into the ventilation system to allow all fans to be stopped in case of an emergency
What do you need to check before Restarting a Vent System?
The Vent Intakes must be checked to see if they are clear of Smoke, Welding Fumes and Debris
