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Essentials Of Fire Fighting Seventh Edition

Essentials Of Fire Fighting Seventh Edition

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Essentials Of Fire Fighting Seventh Edition

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  1. Essentials Of Fire Fighting • Seventh Edition Chapter 6 Portable Fire Extinguishers

  2. Learning Objective 1 • Distinguish among the five classifications of portable fire extinguishers.

  3. Portable Fire Extinguishers • Classified according to type of fire they are designed to extinguish • Some are suitable for more than one class of fire; some only designed for a particular class • Should only be used for intended fire type(s) • Certain extinguishing agents are only effective on certain classes of fuels

  4. Fire Extinguisher Ratings

  5. Classification Of Fire

  6. Class A — Ordinary Combustibles (Cont.)

  7. Class A — Ordinary Combustibles

  8. Class B — Flammable And Combustible Liquids (Cont.)

  9. Class B — Flammable And Combustible Liquids

  10. Class C — Energized Electrical Equipment

  11. Class D — Combustible Metals And Alloys (Cont.)

  12. CAUTION • The use of water or water-based agents on Class D fires will cause the fire to react violently, emit bits of molten metal, and could injure nearby firefighters.

  13. Class D — Combustible Metals And Alloys

  14. CAUTION • Use only Class D rated fire extinguishers to extinguish metal fires.

  15. Class K — Combustible Cooking Oils Courtesy of Steven A. Stokely, Sr. and Midwest Kosher Deli, South Bend, IN (Cont.)

  16. Class K — Combustible Cooking Oils

  17. REVIEW QUESTIONS • List and describe the five classifications of fire. • How are portable fire extinguishers rated?

  18. DISCUSSION QUESTION • Create a mnemonic device (memory device) such as an acronym or phrase to help you remember the five classifications of fire.

  19. Learning Objective 2 • Distinguish among the various types of portable fire extinguishers.

  20. Methods Used To Extinguish Fire

  21. Extinguishing Agent Characteristics

  22. Operational Characteristics Of Portable Fire Extinguishers (Cont.)

  23. Operational Characteristics Of Portable Fire Extinguishers

  24. NOTE • Water-type extinguishers must be protected against freezing if exposed to temperatures lower than 40°F (4°C). Protection options include adding antifreeze to the water or storing them in warm areas.

  25. Portable Fire Extinguisher Mechanisms

  26. Common Portable Fire Extinguishers

  27. Pump-Type Water Extinguishers

  28. Stored-Pressure Water Extinguishers (Cont.)

  29. Stored-Pressure Water Extinguishers (Cont.)

  30. Stored-Pressure Water Extinguishers (Cont.)

  31. Stored-Pressure Water Extinguishers

  32. Aqueous Film Forming Foam (AFFF) Extinguishers (Cont.)

  33. NOTE • Some manufacturers market AFFF foam concentrates that can be used on Class A fires.

  34. Aqueous Film Forming Foam (AFFF) Extinguishers

  35. Clean Agent Extinguishers Courtesy of Ansul Corp.

  36. Carbon Dioxide (CO2) Extinguishers (Cont.)

  37. Carbon Dioxide (CO2) Extinguishers (Cont.)

  38. CAUTION • When the extinguishers discharge carbon dioxide, a static electrical charge builds up on the discharge horn. Touching the horn before the charge has dissipated can result in a shock.

  39. Carbon Dioxide (CO2) Extinguishers

  40. Dry Chemical Extinguishers (Cont.)

  41. Dry Chemical Extinguishers (Cont.)

  42. Dry Chemical Extinguishers

  43. Dry Chemical Extinguishers — Handheld Units • Similar design to air-pressurized water extinguishers • Agent storage tank maintains constant pressure of about 200 psi (1 400 kPa) • Uses nitrogen or carbon dioxide pressurizing gas • Pressure cartridge connected to agent tank • Operator pushes plunger to release gas from cartridge and pressurize the tank • Uses nitrogen or carbon dioxide as the pressurizing gas

  44. CAUTION • When pressurizing a cartridge-type extinguisher, do not place your head or any other part of your body above the top of the extinguisher. If the fill cap was not properly screwed back on, the cap and/or a cloud of agent can be forcibly discharged.

  45. Dry Chemical Extinguishers — Wheeled Units (Cont.)

  46. Dry Chemical Extinguishers — Wheeled Units

  47. CAUTION • The top of the extinguisher should be pointed away from the operator and any other nearby personnel when pressurizing the unit.

  48. Dry Powder Extinguishers (Cont.)

  49. Dry Powder Extinguishers

  50. CAUTION • Water applied to a combustible metal fire results in a violent reaction that intensifies the combustion and causes bits of molten material to spatter in every direction.