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Classes of fire and extinguishers


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  • 1. Portable FirePortable Fire ExtinguishersExtinguishers
  • 2. Classes of Fire • Extinguishers vary in size and type of extinguishing agent used. • Selection of appropriate extinguisher is critical. • Proper use reduces injury and property damage.
  • 3. Classes of Fire • The classes of fire discussed in this presentation is in line with OSHA regulations • Electrical fire is classified as class “C” fire
  • 4. Classes of Fire
  • 5. Classes of Fire
  • 6. Class A Fires • Class A fires involve items such as: – Ordinary wood – Rubber – Household rubbish – Natural vegetation • Water is most common extinguishing agent.
  • 7. Class B Fires • Class B fires involve items such as: – Flammable liquids and gases – Oil – Grease – Tar – Some plastics • Several agents can be used.
  • 8. Class C Fires • Class C fires involve energized electrical equipment such as: – Building wiring – Circuit breakers – Transformers – Power tools • Require agents that will not conduct electricity
  • 9. Types of Extinguishers • Water Used to cool burning fuel below its ignition temperature Intended primarily for Class A fires
  • 10. Types of Extinguishers • Dry chemicals Contain variety of agents in granular form Ordinary models extinguish Class A and B fires. Multipurpose models extinguish Class A, B, and C fires. All can be used on Class C fires, but residue can damages electronics.
  • 11. Types of Extinguishers • Carbon Dioxide (CO2)Extinguishers  Rated for Class B and C fires  Extinguishes by enveloping fuel in a cloud of inert gas  Also cools the burning material  1.5 times heavier than air  Colorless, odorless, nonconductive, and inert  Is noncorrosive  Both an expelling agent and an extinguishing agent
  • 12. Use of Fire Extinguishers • Simple to operate with basic training • Six basic steps for extinguishing fires – Locate the fire – Select the proper extinguisher – Transport the extinguisher to the fire – Activate the extinguisher to release the agent – Apply the extinguishing agent – Ensure personal safety • Practice and training are essential.
  • 13. Locating a Fire Extinguisher • Know the types and locations of extinguisher. • Know where extinguishers are located in and around the work place. • Have at least one extinguisher in your home by your kitchen.
  • 14. Basic Steps of Fire Extinguisher Operation • P-A-S-S acronym: – Pull the safety pin. – Aim the nozzle at the base of the flames. – Squeeze the trigger to discharge agent. – Sweep the nozzle across the base of the flames.
  • 15. Ensure Your Personal Safety • Approach fire with an exit behind you. • Have a planned escape route in case of extinguisher failure. • Never let fire get between you and a safe exit. • After suppression, back away; never turn your back on the fire. • Watch fire for rekindle.
  • 16. Thank you