Fire Extinguisher Presented by Muhammad Ahsan
Fire Extinguisher Presented by Muhammad Ahsan
Fire Extinguisher Presented by Muhammad Ahsan
Types of Fire
Parts
Fire Extinguisher
Inspection
Fire Extinguisher
Maintenance
Conclusion
of
Fire
Extinguisher
Color Coding
Things to Remember
at
He
Ox
yg
en
INTRODUCTION
Chemical
Reaction
Fuel
TYPES OF FIRES
Not all fires are the same. Different fuels create different
fires and require different types of fire extinguisher agents.
Class
Class
Class
Class
Class
A
B
C
D
K
Class A
Class Afires are
fires inordinary
combustiblessuc
h aswood,
paper, cloth,
trash, and
plastics..
Class B
Class Bfires are fires
inflammable liquids
such asgasoline,
petroleum oilandpaint.
Class B Fires also
include flammable gases
such
aspropaneandbutane.
Class B fires do not
include fires involving
cooking oils and grease.
Class C
Class Cfires are fires
involvingenergized
electrical
equipmentsuch
asmotors,
transformers,andappli
ances. Remove the
power and the Class C
fire becomes one of the
other classes of fire.
Class D
Class Dfires are
fires incombustible
metals such
aspotassium,
sodium,
aluminiumand
magnesium.
Class K
Class Kfires are
fires incooking
oils and
greasessuch
asanimal
fatsandvegetabl
e fats.
FIRE EXTINGUISHER
It is an active fire protection device
used to put out small fires till the
fire fighters arrive.
Fire extinguishers are a part of fire
fighting
equipment.
used
in
Carbon Dioxide
Carbon dioxidefire extinguishers
extinguish the fire by taking away
theoxygenelement of the fire
triangle and also by removing
theheat with a very cold discharge.
Carbon dioxide can be used on Class
B & C fires. They are usually
ineffective on Class A fires.
Dry Chemical
Dry Chemicalfire extinguishers extinguish the fire
primarily by interrupting thechemical reactionof the fire
triangle.
Today's most widely used type of fire extinguisher is the
multipurpose dry chemical that is effective on Class A, B
and C fires. This agent also works by creating a barrier
between theoxygenelement and thefuel element on Class
A fires.
Ordinary dry chemical is for Class B & C fires only. It is
important to use the correct extinguisher for the type of
fuel! Using the incorrect agent can allow the fire to reignite
after apparently being extinguished successfully.
Wet Chemical
Wet Chemicalis a new agent that
extinguishes the fire by removing theheatof
the fire triangle and prevents reigniting by
creating a barrier between
theoxygenandfuelelements.
Wet chemical or Class K extinguishers were
developed for modern, high efficiency deep
fat fryers in commercial cooking operations.
Some may also be used on Class A fires in
commercial kitchens.
Clean Agent
HalogenatedorClean Agentextinguishers
include the halon agents as well as the newer
and less ozone depleting halocarbon agents.
They extinguish the fire by interrupting the
chemical reactionof the fire triangle.
Clean agent extinguishers are primarily for
Class B & C fires. Some larger clean agent
extinguishers can be used on Class A, B and
C fires.
Dry Powder
Dry Powderextinguishers are similar to
dry chemical except that they extinguish
the fire by separating thefuelfrom
theoxygen element or by removing
theheatelement of the fire triangle.
However, dry powder extinguishers are
for Class D or combustible metal fires,
only. They are ineffective on all other
classes of fires.
Water Mist
Water Mistextinguishers are a recent
development that extinguishes the fire by
taking away the heat element of the fire
triangle. They are an alternative to the
clean agent extinguishers where
contamination is a concern.
Water mist extinguishers are primarily for
Class A fires, although they are safe for
use on Class C fires as well.
Questions
A. If the fire is small and
contained.
B. If you are safe from toxic
smoke.
C. If you have a means of escape.
D. If your instincts tell you it's
ok.
Pull
Aim
Squeeze
Sweep
Things to Remember
Before you consider fighting a fire...
Make sure everyone has left the building or is
leaving.
Make sure the Fire Fighters have been called.
A fire extinguisher may keep a small fire from
becoming a big one, but you must not endanger
yourself by trying to fight a fire with the wrong
insufficient equipment.
Keep in mind that portable extinguishers are not
designed for fighting large or spreading fires.