6.8 Fixed DC Systems - 6.8 Fixed DC Systems

Question 1

Installed CO2 Systems

Answer 1

Found in auxiliary spaces and lockers that requires protection of flammables

• Paint lockers
• Paint mix and issue rooms
• Flammable liquid storerooms
• Flammable compressed-gas cylinder storerooms
• GTM/GTG modules

Question 2

Halon 1301 System

Answer 2

Protects against “B” fires
Actuators are installed inside and outside the space

Time delays:
- 60 sec (manned)
- 30 sec (unmanned)

Question 3

Halon safety precautions

Answer 3

SCBA is required
Gas Free engineering procedures must be conducted
Lethal products of Halon:
-HCN
-HF
-HBr

Question 4

Heptafluoropropane (HFP)

Answer 4

A colorless, odorless and electrically non-conducting liquefied compressed gas which leaves no residue
Replaces Halon 1301 on some newer ships

Question 5

Water Mist System

Answer 5

Extinguishes the fire by flash cooling the space
The discharge rate for high-pressure water mist is 0.003GPM

Question 6

Magazine Sprinker Systems

Answer 6

Automatic dry-type
Manual dry-type
Automatic wet-type

Question 7

Vertical Launch Deluge System

Answer 7

Dry-type sprinkling system
Applies water directly to a missile when a restrained fire or over-temperature occurs

Question 8

Gaylord Hood

Answer 8

Blowers serving the ventilators are shut off
Hinged grease-extracting baffles close at the air inlet
Fire-smothering water spray is released into the ventilator interior
Power is secured to the Gaylord Hood fire damper and the exhaust ventilation in the galley area

Question 9

Aqueous Potassium Carbonate System (APC)

Answer 9

Used in conjunction with the Gaylord Hood System
Discharges APC automatically and remotely

Question 10

Freshwater Hose Reels

Answer 10

Used to combat fires in vital electronic spaces
50 feet black hose, ľin diameter, adjustable Vari-nozzle
Uses potable water so as not to foul electronics

Question 11

Aqueous Film Forming Foam (AFFF)

Answer 11

Stations provide a solution of 6% AFFF concentrate and 94% seawater at a flow rate of 60 to 1,000GPM to installed AFFF Systems

Question 12

Locations where AFFF Systems are installed

Answer 12

Hangers
Tank decks
Well decks
Vehicle cargo holds
Weapon elevator pits
Fuel pump rooms

Question 13

AFFF Bilge Sprinkler System

Answer 13

Installed throughout the machinery spaces
Used to create a vapor barrier if flammable liquid spills in the bilges

Question 14

Halon 1301 is used in…

Answer 14

• Main machinery and engine rooms
• Auxiliary machinery and boiler rooms
• Ship service or emergency generator rooms
• Main propulsion or generator engine modules
• Recovery, Assist, Secure, and Traverse (RAST) machinery rooms
• Tactical Towed Array Sonar (TACTAS) handling rooms
• Flammable liquids storage and issue rooms