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Chapter 2 classes & spread

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Sadman Ridoy

The document discusses fire prevention and firefighting. It covers the classification of fires into four main classes (A, B, C, D) based on the material that is burning. Class A includes wood and organic materials, Class B includes oils, grease and gases, Class C relates to electrical fires, and Class D involves combustible metals. The document also examines how fire spreads through three methods - conduction, convection and radiation - and outlines the four phases of fire: ignition, developing, absolute fire and burning out.

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(0.25) Fire Prevention and Fire Fighting Chapter 2 Classification of fires How Fire Spreads Sept 2007/chenck/May2002/V3 Chapter 2 1
Previous Chapter In chapter 1, you learn all about chemistry of fire and their properties In chapter 2, you will understand there are different types of fire e.g Wood fire Oil fire Electrical fire etc Sept 2007/chenck/May2002/V3 Chapter 2 2
Classifications of fires There are 4 Classes of fires Class A Fires Class B Fires Class C Fires Class D Fires Sept 2007/chenck/May2002/V3 Chapter 2 3
Classifications of fires Class A fires Class A fires are wood fires or carbonaceous fires Sept 2007/chenck/May2002/V3 Chapter 2 4
Carbonaceous Fires Carbonaceous fires are fires that is made majorly of carbon or organic materials eg Coal Paper Clothes Ropes Rubber etc Sept 2007/chenck/May2002/V3 Chapter 2 5
Class A Fires Sept 2007/chenck/May2002/V3 Chapter 2 6
Classifications of fires What about oil fires? What about petrol fires, cooking oil fires? Fires that come from grease, from tar Fires that come from gas like your those in your house or cigarette lighter? How are these fires classified? Sept 2007/chenck/May2002/V3 Chapter 2 7
Class B Fires These fires are classified as Class B fires Oil fires Liquid fires Grease fires Gas fires Sept 2007/chenck/May2002/V3 Chapter 2 8
Class B Fires Sept 2007/chenck/May2002/V3 Chapter 2 9
Class B Fires Liquid fires are divided into two types Oil fires Combustible liquids Liquid fires Grease fires Flammable liquids Gas fires Sept 2007/chenck/May2002/V3 Chapter 2 10
Class B Fires You must remember that only vapour catches fire Combustible liquid means you have to heat the liquid to a point where there is sufficient vapour given off to allow ignition e.g. cooking oil, fuel oil, diesel oil etc Sept 2007/chenck/May2002/V3 Chapter 2 11
Class B Fires Flammable Liquid means that it is flammable, it can burn straight away It means there is always sufficient vapour emitted, you dont have to heat it to get vapour There is sufficient vapour for immediate ignition e.g. petrol Sept 2007/chenck/May2002/V3 Chapter 2 12
Class B Fires Discussion A cook is cooking vegetable in a pan. He pours some liquid into the pan and it catches fire immediately . Explain why does the original oil in the pan does not ignite? What did he put into the pan to cause this effect? Sept 2007/chenck/May2002/V3 Chapter 2 13
Class C fires Class C fires are fires involving electricity i.e. electrical fires Electrical motors Electrical switchboards Electrical plugs Radios, fans etc Sept 2007/chenck/May2002/V3 Chapter 2 14
Class C Fires Sept 2007/chenck/May2002/V3 Chapter 2 15
Class D fires Involving metals Fine metal powder Magnesium Potassium Sodium etc Sept 2007/chenck/May2002/V3 Chapter 2 16
Class D Fires Sept 2007/chenck/May2002/V3 Chapter 2 17
Summary on Classes of Fires Classes of Fire What It Involves Class A Wood, ropes, clothes, mattress, plastics etc Class B Oil, gas, grease, fuel oil, diesel oil, petrol, kerosene, Class C Electrical equipment Class D Fine metal powder, potassium, Sept 2007/chenck/May2002/V3 sodium, magnesium etc Chapter 2 18
How Fire Spread Fire is spread by an equalization of temperature between two bodies. There are 3 ways how fire spread. Conduction Convection Radiation Sept 2007/chenck/May2002/V3 Chapter 2 19
Fire Spread by Conduction Heat transmission through contact of one body to another e.g. metal Sept 2007/chenck/May2002/V3 Chapter 2 20
Fire Spread by Convection Heat transmission through air or fluid Sept 2007/chenck/May2002/V3 Chapter 2 21
Fire Spread by Radiation Heat transmission through space Sept 2007/chenck/May2002/V3 Chapter 2 22
Summary of how fire spread Conduction Convection Radiation Sept 2007/chenck/May2002/V3 Chapter 2 23
Development of Fire There are 4 phases of fire Ignition Developing Absolute fire Burning out Sept 2007/chenck/May2002/V3 Chapter 2 24
4 Phases of Fire Ignition the starter (incipient) 1 Ignition Sept 2007/chenck/May2002/V3 Chapter 2 25
4 Phases of Fire Developing ( surface fires) 2 developing Sept 2007/chenck/May2002/V3 Chapter 2 26
4 Phases of Fire Absolute Heat has gone into the depth of the material 3 Absolute fire Sept 2007/chenck/May2002/V3 Chapter 2 27
4 Phases of Fire Most of the fuel has been burned. Fire is about to be extinguished. 4 burning out Sept 2007/chenck/May2002/V3 Chapter 2 28
Summary of 4 Phases of Fire Ignition Developing Absolute fire Burning out Sept 2007/chenck/May2002/V3 Chapter 2 29
End of Chapter Sept 2007/chenck/May2002/V3 Chapter 2 30

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Chapter 2 classes & spread

  • 1. (0.25) Fire Prevention and Fire Fighting Chapter 2 Classification of fires How Fire Spreads Sept 2007/chenck/May2002/V3 Chapter 2 1
  • 2. Previous Chapter In chapter 1, you learn all about chemistry of fire and their properties In chapter 2, you will understand there are different types of fire e.g Wood fire Oil fire Electrical fire etc Sept 2007/chenck/May2002/V3 Chapter 2 2
  • 3. Classifications of fires There are 4 Classes of fires Class A Fires Class B Fires Class C Fires Class D Fires Sept 2007/chenck/May2002/V3 Chapter 2 3
  • 4. Classifications of fires Class A fires Class A fires are wood fires or carbonaceous fires Sept 2007/chenck/May2002/V3 Chapter 2 4
  • 5. Carbonaceous Fires Carbonaceous fires are fires that is made majorly of carbon or organic materials eg Coal Paper Clothes Ropes Rubber etc Sept 2007/chenck/May2002/V3 Chapter 2 5
  • 6. Class A Fires Sept 2007/chenck/May2002/V3 Chapter 2 6
  • 7. Classifications of fires What about oil fires? What about petrol fires, cooking oil fires? Fires that come from grease, from tar Fires that come from gas like your those in your house or cigarette lighter? How are these fires classified? Sept 2007/chenck/May2002/V3 Chapter 2 7
  • 8. Class B Fires These fires are classified as Class B fires Oil fires Liquid fires Grease fires Gas fires Sept 2007/chenck/May2002/V3 Chapter 2 8
  • 9. Class B Fires Sept 2007/chenck/May2002/V3 Chapter 2 9
  • 10. Class B Fires Liquid fires are divided into two types Oil fires Combustible liquids Liquid fires Grease fires Flammable liquids Gas fires Sept 2007/chenck/May2002/V3 Chapter 2 10
  • 11. Class B Fires You must remember that only vapour catches fire Combustible liquid means you have to heat the liquid to a point where there is sufficient vapour given off to allow ignition e.g. cooking oil, fuel oil, diesel oil etc Sept 2007/chenck/May2002/V3 Chapter 2 11
  • 12. Class B Fires Flammable Liquid means that it is flammable, it can burn straight away It means there is always sufficient vapour emitted, you dont have to heat it to get vapour There is sufficient vapour for immediate ignition e.g. petrol Sept 2007/chenck/May2002/V3 Chapter 2 12
  • 13. Class B Fires Discussion A cook is cooking vegetable in a pan. He pours some liquid into the pan and it catches fire immediately . Explain why does the original oil in the pan does not ignite? What did he put into the pan to cause this effect? Sept 2007/chenck/May2002/V3 Chapter 2 13
  • 14. Class C fires Class C fires are fires involving electricity i.e. electrical fires Electrical motors Electrical switchboards Electrical plugs Radios, fans etc Sept 2007/chenck/May2002/V3 Chapter 2 14
  • 15. Class C Fires Sept 2007/chenck/May2002/V3 Chapter 2 15
  • 16. Class D fires Involving metals Fine metal powder Magnesium Potassium Sodium etc Sept 2007/chenck/May2002/V3 Chapter 2 16
  • 17. Class D Fires Sept 2007/chenck/May2002/V3 Chapter 2 17
  • 18. Summary on Classes of Fires Classes of Fire What It Involves Class A Wood, ropes, clothes, mattress, plastics etc Class B Oil, gas, grease, fuel oil, diesel oil, petrol, kerosene, Class C Electrical equipment Class D Fine metal powder, potassium, Sept 2007/chenck/May2002/V3 sodium, magnesium etc Chapter 2 18
  • 19. How Fire Spread Fire is spread by an equalization of temperature between two bodies. There are 3 ways how fire spread. Conduction Convection Radiation Sept 2007/chenck/May2002/V3 Chapter 2 19
  • 20. Fire Spread by Conduction Heat transmission through contact of one body to another e.g. metal Sept 2007/chenck/May2002/V3 Chapter 2 20
  • 21. Fire Spread by Convection Heat transmission through air or fluid Sept 2007/chenck/May2002/V3 Chapter 2 21
  • 22. Fire Spread by Radiation Heat transmission through space Sept 2007/chenck/May2002/V3 Chapter 2 22
  • 23. Summary of how fire spread Conduction Convection Radiation Sept 2007/chenck/May2002/V3 Chapter 2 23
  • 24. Development of Fire There are 4 phases of fire Ignition Developing Absolute fire Burning out Sept 2007/chenck/May2002/V3 Chapter 2 24
  • 25. 4 Phases of Fire Ignition the starter (incipient) 1 Ignition Sept 2007/chenck/May2002/V3 Chapter 2 25
  • 26. 4 Phases of Fire Developing ( surface fires) 2 developing Sept 2007/chenck/May2002/V3 Chapter 2 26
  • 27. 4 Phases of Fire Absolute Heat has gone into the depth of the material 3 Absolute fire Sept 2007/chenck/May2002/V3 Chapter 2 27
  • 28. 4 Phases of Fire Most of the fuel has been burned. Fire is about to be extinguished. 4 burning out Sept 2007/chenck/May2002/V3 Chapter 2 28
  • 29. Summary of 4 Phases of Fire Ignition Developing Absolute fire Burning out Sept 2007/chenck/May2002/V3 Chapter 2 29
  • 30. End of Chapter Sept 2007/chenck/May2002/V3 Chapter 2 30
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