Fire Extinguisher-Types of Fire Extinguishers, Understanding Fire Extinguisher Classes (For CBSE, ICSE, IAS, NET, NRA 2022)

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Fire Extinguisher - Types of Fire Extinguishers

  • Fire is one of the most useful phenomena we exploit in our day-to-day life for cooking, for illumination and various other tasks. This is due to controlled production of fire. The fire which is a boon for us can turn into a bane too if it is not controlled. For example, you have heard of forest fires, fires breaking out at homes causing huge destruction. We generally call the fire brigade in such cases to control the blazing flames. The Fire department officials generally use fire extinguishers to extinguish the fire depending on its severity and magnitude.
  • The Fire extinguisher is a device used by the fire brigade personal to control fire. According to the concept of the fire triangle, for the generation of fire, we need three things to be present simultaneously. These are fuel (something which can burn) , a heat source (which can ignite the fuel) and air (for a constant supply of oxygen) . So, if we remove any one of these resources, the fire can be controlled. Fire extinguishers generally cut off the supply of oxygen to control file.

Definition of Fire Extinguisher

  • Fire extinguishers are portable devices used to extinguish small fires or reduce their destruction before firefighters arrive at the scene. These are kept handy at places, namely fire points, in buildings, factories, public paces or transportation.
  • The types and numbers of extinguishers legally required for an area are governed by the safety regulations in force in that particular area.

Types of Fire Extinguishers

Depending on the way how the fire extinguisher alters any of the controlling elements from the fire triangle, fire extinguishers are of a considerable variety, namely:

  • Water and foam: Take away the heat and the oxygen element.
  • Carbon Dioxide: Takes away the heat and the oxygen element.
  • Dry Chemical: Interrupt the chemical reaction responsible for the fire.
  • Wet Chemical Removes the heating element and blocks oxygen and fuel from re-ignition.
  • Clean Agent: Interrupts the chemical reaction of the fire.
  • Dry Powder: Separates fuel from oxygen and removes heat.
  • Water mist: Takes away the heating element.
  • Cartridge Operated Dry Chemical: Interrupts the chemical reaction of the fire.

Understanding Fire Extinguisher Classes

There are four classes of fire extinguishers – A, B, C and D – and each class can put out a different type of fire.

  • Class A extinguishers will put out fires in ordinary combustibles such as wood and paper.
  • Class B extinguishers are for use on flammable liquids like grease, gasoline and oil.
  • Class C extinguishers are suitable for use only on electrically energized fires
  • Class D extinguishers are designed for use on flammable metals.

Working of Water Fire Extinguisher

  • You must have seen fire brigade personal spraying water at the place where the fire has incurred to suppress it. What does this water do?
  • Firefighters controlling the fire with the fire
  • When the fire brigade personal starts spraying water over the places where the fire has occurred, water starts to cool down the temperature of the fire. As the temperature starts to fall down, due to the continuous spraying of water, it finally comes down below the ignition temperature of the fuel. So, fuel cannot be ignited anymore, thus it prevents the fire from spreading. Furthermore, the water vapours generated block the supply of oxygen to the fuel surface, thereby decreasing the supply of oxygen to it. We cannot use water fire extinguishers in all the cases to control fire.
  • For example, in the case of electrical fires and fire produced by inflammable substances. In such cases, we generally use a soda-acid fire extinguisher or a fire extinguisher which cuts off the supply of oxygen to extinguish the fire.

Question

What Does Fire Extinguisher Mean?

Answer:

  • Fire extinguishers are portable devices used to extinguish small fires or reduce their destruction before firefighters arrive at the scene. These are kept handy at places, namely fire points, in buildings, factories, public paces or transportation.
  • The types and numbers of extinguishers legally required for an area are governed by the safety regulations in force in that particular area.

Which Gas is Used in Fire Extinguisher?

Answer:

Handheld extinguishers, which are commonly sold at hardware stores for use in the kitchen or garage, are pressurized with nitrogen or carbon dioxide to propel a stream of fire-squelching agent to the fire.

What Does the Fire Extinguisher Sign Mean?

Answer:

Fire Extinguisher Signs are used to help identify the location of a single or multiple fire extinguishers. They are generally mounted 2 metres above floor level for visibility or adjacent to the fire extinguisher.

What Are the 4 Types of Fire Extinguishers?

Answer:

There are four classes of fire extinguishers – A, B, C and D – and each class can put out a different type of fire. Multipurpose extinguishers can be used on different types of fires and will be labeled with more than one class, like A-B, B-C or A-B-C.

What is Fire Extinguisher Used For?

Answer:

A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations.

What Colour Are Fire Extinguishers?

Answer:

There are 5 fire extinguisher colours: red, cream, blue, black and yellow. Each represents a different type for use on different classes of fires, as explained above. These colours changed in 1997 to meet British and European Standard BS EN3.

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