RANA FARHAN ALI (13ME-CH02)
DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET
JAMSHORO,SINDH,PAKISTAN
Fire is the rapid oxidation of a material
in the exothermic chemical process
of combustion, releasing heat, light, and
var...


Fire is an important process that affects ecological
systems across the globe. The positive effects of fire
include sti...





F=FIND THE FIRE
I=INFORM OTHERS
R=RESCUE
E=ELIMINATE THE FIRE
Class A fire
those fires which involve ordinary combustible
materials such as wood, paper or cloth. WATER is
effective in ...
Class C fire
Those fires which involve ELECTRICITY.
Either dry chemical powder or co2 should be used to
eliminate these fi...
In order to understand how fire extinguishers work and
types you first need to know a little bit about fire triangle.


Oxygen, heat, and fuel are
frequently referred to as the "fire
triangle." Add in the fourth
element, the chemical
react...







Different types of fire extinguishers are designed to
fight different classes of fire. The three most
common ty...








APW stands for "air-pressurized water." APWs are
large, silver extinguishers that are filled about twothirds o...
Carbon Dioxide extinguishers are filled with nonflammable carbon dioxide gas under extreme pressure.
You can recognize a C...







Dry Chemical Extinguishers come in a variety of types. You
may see them labeled:
"DC" short for "dry chem."
"A...
An "ABC" extinguisher will have a label like
this, indicating that it may be used on class
A, B and C fires.
It's easy to remember how to use a fire extinguisher if
you can remember the acronym PASS, which stands
for
 Pull the pin...
FIRE, Its CLASSES And FIRE by RANA FARHAN ALI (13ME-CH02)  DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET  JAMSHORO,SINDH,PAKISTAN
FIRE, Its CLASSES And FIRE by RANA FARHAN ALI (13ME-CH02)  DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET  JAMSHORO,SINDH,PAKISTAN
FIRE, Its CLASSES And FIRE by RANA FARHAN ALI (13ME-CH02)  DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET  JAMSHORO,SINDH,PAKISTAN
FIRE, Its CLASSES And FIRE by RANA FARHAN ALI (13ME-CH02)  DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET  JAMSHORO,SINDH,PAKISTAN
FIRE, Its CLASSES And FIRE by RANA FARHAN ALI (13ME-CH02)  DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET  JAMSHORO,SINDH,PAKISTAN
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FIRE, Its CLASSES And FIRE by RANA FARHAN ALI (13ME-CH02) DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET JAMSHORO,SINDH,PAKISTAN

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FIRE, Its CLASSES And FIRE by RANA FARHAN ALI (13ME-CH02) DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET JAMSHORO,SINDH,PAKISTAN

  1. 1. RANA FARHAN ALI (13ME-CH02) DEPARTMENT OF CHEMICAL ENGG:MEHRAN UET JAMSHORO,SINDH,PAKISTAN
  2. 2. Fire is the rapid oxidation of a material in the exothermic chemical process of combustion, releasing heat, light, and various reaction products. Slower oxidative processes like rusting or digestion are not included by this definition.
  3. 3.  Fire is an important process that affects ecological systems across the globe. The positive effects of fire include stimulating growth and maintaining various ecological systems. Fire has been used by humans for cooking, generating heat, signaling, and propulsion purposes. The negative effects of fire include water contamination, soil erosion, atmospheric pollution and hazard to life and property.
  4. 4.     F=FIND THE FIRE I=INFORM OTHERS R=RESCUE E=ELIMINATE THE FIRE
  5. 5. Class A fire those fires which involve ordinary combustible materials such as wood, paper or cloth. WATER is effective in extinguishing these types fires. Class B fire those fires which Involves flammable liquids,gases,oils,paints and grease. Either dry chemical powder or CO2 should be used to extinguish these type fires.
  6. 6. Class C fire Those fires which involve ELECTRICITY. Either dry chemical powder or co2 should be used to eliminate these fire. DO NOT USE WATER. Class D fire Those fire which involve combustible metals such as sodium or magnesium.dry chemical powder should be use to eliminate that fire.
  7. 7. In order to understand how fire extinguishers work and types you first need to know a little bit about fire triangle.
  8. 8.  Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.
  9. 9.     Different types of fire extinguishers are designed to fight different classes of fire. The three most common types of fire extinguishers are: Water (APW) Carbon Dioxide (CO2) Dry Chemical (ABC,BC,DC)
  10. 10.     APW stands for "air-pressurized water." APWs are large, silver extinguishers that are filled about twothirds of the way with ordinary tap water, then pressurized with normal air. APWs stand about 2 feet tall and weigh approximately 25 pounds when full. APWs extinguish fire by taking away the "heat" element of the fire triangle. APWs will be found in older buildings, particularly in public hallways, as well as in Residence Halls.
  11. 11. Carbon Dioxide extinguishers are filled with nonflammable carbon dioxide gas under extreme pressure. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. The pressure in the cylinder is so great that when you use one of these extinguishers, bits of dry ice may shoot out the horn. CO2s are designed for Class B and C (flammable liquid and electrical) fires only.  CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. 
  12. 12.      Dry Chemical Extinguishers come in a variety of types. You may see them labeled: "DC" short for "dry chem." "ABC" indicating that they are designed to extinguish class A,B,and C fires, or "BC" indicating that they are designed to extinguish class B and C fires. Dry chemical extinguishers put out fire by coating the fuel with a thin layer of dust, separating the fuel from the oxygen in the air. The powder also works to interrupt the chemical reaction of fire, so these extinguishers are extremely effective at putting out fire.
  13. 13. An "ABC" extinguisher will have a label like this, indicating that it may be used on class A, B and C fires.
  14. 14. It's easy to remember how to use a fire extinguisher if you can remember the acronym PASS, which stands for  Pull the pin  Aim at the base of the fire  Squeeze the top handle or lever and  Sweep from side to side . 

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