FIRE
It takes three things to cause a fire:
Heat - or
something that is hot
something that is hot
Fuel - or
something that will burn
something that will burn
Oxygen - the air
that is all around us
that is all around us
Fire Triangle = Heat +
Oxygen + Fuel
Fire Tetrahedron = Heat +
Oxygen + Fuel + Chain Reaction
If we remove any one side of the triangle, the fire
cannot take place.
cannot take place.
by doing these activities-
Cooling: Remove the HEAT sources,
and there is nothing hot to start the fire.
and there is nothing hot to start the fire.
Starvation: Remove the FUEL sources,
and there is nothing to burn.
and there is nothing to burn.
Smothering: Remove the OXYGEN and
the oxidation reaction stops.
the oxidation reaction stops.
Method of Extinguishment
Cooling-
Removal of heat. (Best cooling media is water)
Removal of heat. (Best cooling media is water)
Smothering-
Reducing % of oxygen. Cutting off the supply of oxygen. (Blanketing, Use foam)
Reducing % of oxygen. Cutting off the supply of oxygen. (Blanketing, Use foam)
Starvation- Removal of fuel or removal of combustible material.
Fire Classification: A, B, C,
D, E
A: Solid Combustible Substances –wood, paper, plastic,
coal etc.
coal etc.
B: Flammable Liquids – petrol, diesel, paint etc.
C: Flammable Gases – LPG, hydrogen, acetylene etc.
D: Metal Fire – Mg, Al, Na etc.
E: Electric Fire – Electric and Electronic equipment.
Fire Extinguisher
- Foam Type
- Dry Chemical Powder DCP and
- Carbon Di-Oxide
Foam Type Extinguisher:
It is a powerful flame knockout agent for contained Flammable
and volatile liquid fires involving like petrol, paints and other solvents.
Foam extinguishers are used to form a thick blanket of foam over the burning
surface, effectively cutting off the oxygen supply there by smothering the
fire and prevent re-ignition. Foam extinguishers are effective against ‘A’ &
‘B’ class of fire.
and volatile liquid fires involving like petrol, paints and other solvents.
Foam extinguishers are used to form a thick blanket of foam over the burning
surface, effectively cutting off the oxygen supply there by smothering the
fire and prevent re-ignition. Foam extinguishers are effective against ‘A’ &
‘B’ class of fire.
Dry Chemical Powder Extinguishers:
These are versatile
and highly effective against ‘B’ & ‘C’ class fires, specially
for combating three dimensional or running fires involving spilled inflammable
liquids on ground like petrol, paints and gases. They can also be used on Energized
Electrical Equipment’s.
and highly effective against ‘B’ & ‘C’ class fires, specially
for combating three dimensional or running fires involving spilled inflammable
liquids on ground like petrol, paints and gases. They can also be used on Energized
Electrical Equipment’s.
Carbon dioxide fire extinguisher:
Carbon dioxide fire
extinguishing media is highly effective against ‘B’ & ‘C’ class
of fire. They can also be used on Energized Electrical
Equipment’s.
extinguishing media is highly effective against ‘B’ & ‘C’ class
of fire. They can also be used on Energized Electrical
Equipment’s.
What should you do if your clothes catch on fire?
Stop -> Drop -> Roll
If someone else is on fire:
- Make sure
they don’t run - Use a
blanket to smother the fire - Put water on
them to put out the fire
- You can prevent your clothes from catching on fire by not
getting too close to fire, take utmost care on carrying out hot jobs.
- If you want to rescue yourself in a smoke filled area do
not walk/run, crawl on the floor instead. Do not use Lift. Use stairs, rush to
the windows/doors.
ChemistryNotesInfo- Innovative Online Education Classes 9, 10, 11, 12, Degree Courses BSc, MSc: Fire and Safety: FIRE It takes three things to cause a fire: Heat - or something that is hot Fuel - or something that will burn Oxygen - the ai...
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