Transcript 03.6 Fire Fighting

FIRE FIGHTING
Introduction
• Fighting fire is not a tasking for RCM-SAR.
• However knowledge of how to deal with a fire
is important, should there be a fire on the
rescue vessel, or the rescue vessel is called
upon to rescue survivors from a vessel on
fire.
Fire
Fire Tetrahedron
• Most fires need at least four components to
survive. These are :
1. Heat
2. Fuel
3. Oxygen
4. Chain reaction
• Fire extinguishing is based on removing or
interfering with at least one of these items
Fire Tetrahedron
For example:
Remove the air by using a fire blanket or by
putting a layer of foam.
Remove the heat by using water to reduce the
temperature.
Remove the fuel, by turning off the fuel valve,
or pulling combustibles away so there is
nothing less to burn
Fire Tetrahedron
• There is a fourth section which is where a
extinguishing chemical such as halon can
interfere with the chemistry of combustion,
and this produces the “fire tetrahedron”.
Fire Tetrahedron
In Case of Smoke or Fire
• FIND - the fire, location and size
• INFORM - inform everyone on board - make
distress call to other vessels
• RESTRICT - stop air supply by closing doors,
hatches, windows, air ventilation, fuel cocks,
turn off batteries, and turn vessel to blow
smoke and flames over the side
• EXTINGUISH - use appropriate fire fighting
system available.
Fire Extinguishers
Fire Extinguishers
Objectives
• IDENTIFY 3 common classes of fires
• SELECT the proper type of extinguisher
• EVALUATE when it is safe to
fight an “early-stage” fire, and;
• APPLY the “P.A.S.S. method to operate a
portable extinguisher.
Untrained People
cannot use a fire extinguisher safely because
they are:
• UNABLE to evaluate a fire
• UNAWARE of DANGER due to...
• LACKING JUDGEMENT regarding:
– Safe and correct use of, and
– Limitations of portable
extinguishers
Why Untrained People
Can’t use a fire extinguisher safely
(continued):
INEXPERIENCED
• Don’t know about the proper
type of extinguisher
• Don’t know how to make a
“Fight or Flight” analysis
• Unfamiliar with the “P.A.S.S.
method”
Fire Classifications
“Ordinary” combustibles
Paper, wood, rubber, plastics
and textiles.
“Flammable liquids”
Oil, gasoline, solvents
“Energized circuits”
Electrical equipment
and computers
Fire Classifications
“Combustible Metals”
Certain combustible metals such as
sodium, magnesium, potassium, etc.
You should not generally meet this
type of fire.
How They Work:
Works by cooling.
Numerical rating indicates amount of agent, duration, and
range of discharge on test fires.
Area of Class A fire which a “non-expert” can extinguish,
with proper training
1-A is equivalent on Class-A fire to five liters of water.
2-A contains has twice as much extinguishing agent.
How They Work:
Works by blanketing the fuel.
Interrupts chemical reaction at fuel surface.
Class B ratings signify the area in square feet of
flammable liquid fire a unit will extinguish when used, by a
trained, “non-expert.”
How They Work:
Class “C” units have no numerical rating.
A Class “C” rating doesn’t imply any capacity.
Only indicates that the extinguishing agent is nonconductive, safe on energized equipment.
Works by displacing oxygen, smothering fire.
How They Work:
2A10BC
This is a comparison type of rating system and,
in this case, it means that this extinguisher will
put out 2 units of a class 'A' fire, 10 units of a
class 'B' fire, and that it is rated for use on class
'C' fires. No value is assigned for class 'C', as it
only implies that the extinguisher is safe and
effective for use on live electrical fires.
Underwriter Laboratories of
Canada
All Canadian extinguishers will have the above
symbol
Portable Fire Extinguishers
LIMITED IN:
• Capacity - 1.5 to 25 lbs. of
extinguishing agent
• Range - Typically 3 to 15 feet
• Duration - Discharge their
contents in only 5 to 30
seconds!
Extinguisher Common Features
•
•
•
•
Locking pin
Carrying handle / operating lever
Pressure gauge
Label :
–
–
–
–
Type (Water, C02, Dry Chemical)
Classification (A, B, C)
Capacity Rating
Instructions
• Discharge nozzle or horn
Common Types Of Fire
Extinguishers
• WATER
• DRY CHEMICAL
• CO2 and Halon
Water Extinguisher
• Water + CO2 propellant
• ONLY for Class
fires
– wood / paper, etc.
• Spreads burning liquids!
• DANGER of electric shock if
used on on live circuits!
Dry Powder
Multi-Purpose Rated
Either
Or
• Best for general use:
• Reduced risk of re-ignition
• A 10 lb. unit empties in 8-10 secs.
– Effective range of 6 ft. to 15 ft.
Carbon Dioxide -
Rated
• Best on burning liquids / electrical
• SHORT range - 3 to 8 ft.
• 10- pound unit empties in 5 to 10 seconds!
– Use short spurts!
• DISPERSES QUICKLY!
– Continue applying after the fire is out!
• Unit gets VERY cold - hold properly
Halon Extinguisher
• Best for computers / electronics
• Weight-for-weight TWICE as effective as C02
• No residue, easy clean-up
• VERY SHORT range, 3 to 6 ft.
• Like C02, Discharges QUICKLY!
• Like C02, Disperses QUICKLY!
– Continue after flames are extinguished
P.A.S.S.
Remember
1) Keep your back to
a clear escape
route,
2) Stand back 6 to 8
feet from the fire,
3) Stay low below
heat,
4) Then >>:
P.A.S.S.
PULL
AIM
SQUEEZE
SWEEP
PULL the pin
AIM
LOW at the base of the fire
SQUEEZE
the lever
SWEEP
from side to side
Servicing
• All extinguishers should be serviced annually
Approaching a Fire
Approaching a Fire
• Where the rescue vessel has been called to a
burning vessel, conduct the Stop, Assess,
Plan, looking for survivors, the source of the
fire, and any items such as propane tanks,
fuel tanks or diving tanks that are liable to
explode.
Approaching a Fire
Approaching a Fire
• Always approach from windward of the
casualty that is on fire, if circumstances
permit, to stay out of the smoke.
• If survivors are still on board, urge them to
don lifejackets, and jump off to windward to
recover them from the water.
Water Wall
•It is not work of RCM-SAR to extinguish vessel
fires, but to recover survivors.
•RHIBs are not designed for fire-fighting.
•If an approach has to be made to a burning
vessel to recover a survivor, one use of the dewatering pump is to generate a “water wall”.
•The hose nozzle will be adjusted to form a spray
pattern, also called "water wall" and will protect
the tubes and the personnel from radiant heat).
Water Wall
OK, It’s out…
Now What?
• WATCH the fire area
– If the fire flares up, back out immediately and call
the fire department!