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Fire hazard

Fire hazards, types and control or prevention by Shilpa Paul

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Fire hazard

  2. 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. 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. 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. 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. 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. 7. • CLASS K FIRES: Class K fires are fires in cooking appliances that involve combustible cooking media (vegetable, animal oils or fats).
  8. 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.
  10. 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. 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. 12. THANK YOU