Fire Fighting Flashcards
When flammable liquids are handled in a compartment, the ventilation for the area should be?
operated continuously while vapors may be present
What is the first action you take if you discover a fire aboard a ship?
Sound the alarm
What is spontaneous combustion caused by?
chemical action within a substance
Spontaneous combustion is most likely to occur in?
rags soaked in linseed oil
Except in rare cases, it is impossible to extinguish a shipboard fire by?
removing the fuel
How is the spread of fire prevented?
Cooling surfaces adjacent to the fire, removing combustibles from the endangered area, shutting off the oxygen supply
The spread of fire is not prevented by:
removing smoke and toxic gases by ensuring adequate ventilation
To prevent spread of fire by conduction you should cool?
The bulkheads around the fire
Convection spreads fire by?
Heated gases flowing through the ventilation systems
To prevent spread of fire by convection you should?
Close all openings to the area
Radiation spreads fire by?
Transferring heat across an unobstructed space
How can fires be spread?
Conduction of heat to adjacent surfaces, direct radiation, or convection
The best method of extinguishing a class A fire is?
cool the fuel below the ignition temperature
A large fire, involving class A material has developed in the ships galley. In combating the fire you should cool:
the adjoining horizontal and vertical surfaces before opening the galley door
The blanketing effect is essential on what class of fire?
B
If heavy smoke is coming from the paint locker, the first firefighting response should be to:
secure the ventilation
Fires that would most likely occur in the engine room would be what class?
B and C
The primary hazard other than fire damage associated with class C fires?
electrocution or shock
How do foam extinguishers extinguish a fire?
By shutting off the air supply
What is a limitation of foam as an extinguishing agent?
It conducts electricity
Foam is effective on what class fires?
A and B
How do CO2 extinguishers extinguish fires?
smothering
What are some characteristics of CO2
heavier than air, non-conductive and is used on class B and C fires
Why is CO2 better than dry chem at fighting a class C fire?
It doesn’t leave a residue
Compared to CO2 dry chem has greater or lesser range?
Greater
What is the danger associated with using CO2 in an enclosed space?
Asphyxiation
What is the extinguishing agent most likely to allow a re-flash as a result of not cooling the fire below its ignition temperature?
CO2
How do dry chem extinguishers extinguish class B fires?
By breaking the chain reaction
When fighting an oil or gasoline fire in the bilge, a solid stream water nozzle should?
Not be used
How does high velocity fog extinguish fire?
By absorbing heat and reducing the supply of oxygen
What is the best method for applying water when attempting to enter a compartment on fire?
sweeping the compartment with a fog stream
What will cool down a heated bulkhead in the least amount of time?
Water fog or spray
Which has less range, high velocity fog or low velocity fog?
Low
After extinguishing a fire with CO2 it is advisable to?
Stand by with water or other agents
Where should the discharge of a CO2 extinguisher be directed at?
the base of the flames
What must you do before using a CO2 extinguisher to fight an engine room fire?
Secure the engine room ventilation, secure the machinery in the engine room and evacuate all engine room personal
Fire in an engine compartment is best extinguished with CO2 and by?
closing the compartment
Where should the stream of dry chem be directed when electrical equipment is involved in fire?
At the source of the flame
When fighting a class B fire with dry chem where should the discharge be directed?
at the seat of the fire, starting near the edge
What is the best method to apply foam?
Flow the foam down a nearby vertical surface
A firehose must be connected to each hydrant except?
when exposed to heavy weather or when the firehose might be damaged by cargo operations
What is the most vulnerable part of the fire main system?
the firehose
What are firehose couplings made of?
Brass, bronze or soft alloy metals
The min. number of people required to safely handle a 2 1/2 inch firehose is?
2
Where would a fixed CO2 not be used?
crew quarters or spaces open to the atmosphere
Hand portable and semi portable fire extinguishers are classified with?
A letter indicating the type of fire the unit is expected to extinguish and a Roman numeral that indicates the size of the unit
How do the Roman numeral labeling system for fire extinguishers work?
I is the smallest, ends with V which is the largest
What numerals on extinguishers indicate a portable extinguisher?
I, II, III
What numerals on extinguishers indicate a semi portable extinguisher?
III, IV, V
How heavy must an extinguisher be to be considered semi-portable
55lbs or greater, they must be fitted with a suitable length of hose and nozzle that can reach all parts of the space they are suppose to protect
A metallic nameplate is required to be attached to all hand held portable extinguishers, it lists?
the identity mark of the manufacture, the name of the item, and the rated capacity in gallons, quarts or pounds
Is the hydrostatic test date listed on the metallic nameplate of an extinguisher?
No
What are the number of required extinguishers per vessel based on?
Vessel length
When dry chem extinguishes as class B fire is there a danger of reflash?
yes
