This presentation discusses fire hazards and fire extinguishers. It defines a fire hazard as conditions involving oxygen, fuel and heat that allow fire to start or spread. It describes five classes of fires - Class A involving ordinary combustibles, Class B involving flammable liquids, Class C involving live electrical equipment, Class D involving combustible metals, and Class K involving cooking fires. It then defines a fire extinguisher as a handheld pressure vessel containing an agent to extinguish small fires, and lists the five classes of fire extinguishers corresponding to the classes of fires.

1. PRESENTATION ON
FIRE HAZARDS
PREPARED BY
SHILPA PAUL
m

2. WHAT IS A FIRE HAZARD
• Conditions that favor the development or
growth of fire i.e. with a oxygen, fuel and
heat.
• Fire hazards usually involve the mishandling of
fuel or heat.
• Fire or combustion is a chemical reaction
between oxygen and a combustible fuel.
• Sources of ignition are spark, flame, and high
temperatures are needed.

3. TYPES OF FIRES
• CLASS A FIRES: Class A fires (designation
symbol is a green triangle) involve ordinary
combustible materials like paper, wood and
fabrics, rubber. Most of the times, this type of
fire is effectively quenched by water or
insulating by other suitable chemical agent.

4. • CLASS B FIRES: Class B fires (designation
symbol is a red square) mostly involve
flammable liquids (like gasoline, oils, greases,
tars, paints etc) and flammable gases. Dry
chemicals and carbon dioxide are typically
used to extinguish these fires.

5. • Class C fires: Designation symbol is a blue
circle involve live electrical equipment like
motors, generators and other appliances. For
safety reasons, non conducting extinguishing
agents such as dry chemicals or carbon
dioxide are usually used to put out these fire.

6. • CLASS D FIRES: Class D fires (designation
symbol is a yellow decagon) involve
combustible metals such as magnesium,
sodium, lithium, potassium etc. Sodium
carbonate, graphite, bicarbonate, sodium
chloride, and salt-based chemicals extinguish
these fires.

7. • CLASS K FIRES: Class K fires are fires in cooking
appliances that involve combustible cooking
media (vegetable, animal oils or fats).

8. WHAT IS FIRE EXTINGUISHER
• A fire extinguisher is an active fire protection
device used to extinguish or control small
fires, often in emergency situations.
• Typically, an fire extinguisher consists of a
hand-held cylindrical pressure vessel
containing an agent.

9. TYPES OF FIRE EXTINGUISHER

10. • Class A fire extinguisher: Contain water for use
against fires involving ordinary combustibles
like paper, wood, cloth, and most plastics.
• Class B fire extinguisher: Use dry chemicals to
put out fires caused by gasoline, oil and
solvents.
• Class C fire extinguisher: Contains carbon-
dioxide for use against fires.
• Class D fire extinguisher: Spray dry powder on
combustible metals like magnesium, titanium,

11. Aluminum, sodium and potassium.
• Class K fire extinguisher: Use a wet potassium
acetate based, low pH agent to put out
“cooking” fires in which there are animal or
vegetable oils and fats.

12. THANK YOU