Fire Safety: Removing Oxygen to Extinguish Fires
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Questions and Answers

What is the primary reason why a piece of paper exposed to oxygen in the air does not burn?

  • The paper does not have a low flashpoint
  • The paper is not a fuel source
  • The paper is not a flammable liquid
  • The paper lacks sufficient heat (correct)

    • What is the most effective way to extinguish a fire involving an LPG tank flame at the nozzle of the valve?

  • Shutting off the valve (correct)
  • Removing the oxygen source
  • Cutting fire lanes around the tank
  • Pumping the contents to an empty tank

    • Which of the following is a example of removing fuel from a fire?

  • Pumping flammable liquid storage tanks to an empty tank (correct)
  • Removing the oxygen source from a fire
  • Shutting off the valve of an LPG tank
  • Cutting fire lanes in forests

    • What is the percentage of oxygen in the air that is required for combustion to occur?

    <p>21% oxygen</p> Signup and view all the answers

    What is the primary purpose of cutting fire lanes in forests?

    <p>To prevent conflagration</p> Signup and view all the answers

    What is the consequence of having a substance with a low flashpoint?

    <p>It is more dangerous</p> Signup and view all the answers

    What is the primary method of extinguishing a fire by reducing the concentration of oxygen?

    <p>Discharging inert gases into the fire</p> Signup and view all the answers

    What is the term used to describe the process of covering a burning area with a non-combustible material to eliminate oxygen?

    <p>Suffocating the fire</p> Signup and view all the answers

    What is the purpose of using water to extinguish a fire?

    <p>To reduce the heat below the kindling point</p> Signup and view all the answers

    What is the principle behind using dry chemicals to extinguish a fire?

    <p>Interrupting the chain reaction of combustion</p> Signup and view all the answers

    What is the term used to describe the process of reducing the heat of a fire below the kindling point?

    <p>Removing heat from the fire</p> Signup and view all the answers

    What is the primary method of preventing a fire from spreading?

    <p>Separating fuel from the fire</p> Signup and view all the answers

    What is the primary purpose of understanding the fire triangle?

    <p>To illustrate the elements necessary for fire to start</p> Signup and view all the answers

    What is the primary difference between a flammable and combustible substance?

    <p>Flashpoint, with flammable substances having a flashpoint below 100 °F (37.8 °C)</p> Signup and view all the answers

    What is the fourth element necessary for flame propagation in the Fire Tetrahedron?

    <p>The chemical reaction itself</p> Signup and view all the answers

    What is the purpose of identifying fuel sources in the workplace?

    <p>To prevent fires by managing fuel sources</p> Signup and view all the answers

    What is the term for the lowest temperature at which fuel begins to give off flammable vapors?

    <p>Flashpoint</p> Signup and view all the answers

    What is the primary method of fire extinguishment that targets the oxygen element of the fire triangle?

    <p>Smothering</p> Signup and view all the answers

    Study Notes

    Fire Basics

    • A substance with a low flashpoint is more dangerous than one with a high flashpoint.
    • Oxygen is necessary for fire to occur, making up 21% of the air we breathe, with nitrogen making up the remaining 78%.
    • Heat is the third element required for fire to start, even if fuel and oxygen are present.

    The Fire Triangle

    • The fire triangle illustrates the three elements necessary for fire to start: Fuel, Oxygen, and Heat.
    • Removing any one of these elements can extinguish a fire.

    Extinguishing a Fire

    • Removing Fuel: difficult and often dangerous, but possible by shutting off fuel supplies, pumping flammable liquids to an empty tank, creating fire lanes, or burning away fuel sources.
    • Removing Oxygen: by smothering the fire with a non-combustible material, covering with foam, or discharging inert gases like carbon dioxide.
    • Removing Heat: by reducing the heat below the kindling point or flashpoint, using water or foam as a common agent.
    • Interrupting the Chain Reaction: by inhibiting the oxidation process and production of flammable vapors, using dry chemicals as an example.

    Fire Safety and Classification

    • Fire is a chemical reaction between a flammable material and oxygen, producing energy, light, smoke, and toxic gases.
    • The Fire Tetrahedron includes four elements: Fuel, Oxygen, Heat, and the chemical reaction itself.
    • Fuel: any material that will burn, including flammable and combustible substances.
    • Flammable Substance: a substance with a flashpoint below 100°F (37.8°C) and vapor pressure not exceeding 20 psia at 100°F.
    • Examples of flammable substances include gasoline, ether, acetone, and alcohol, each with their respective flashpoints.

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    Description

    Learn how to remove oxygen to extinguish fires by smothering the burning area or reducing oxygen concentration. Understand the methods to starve fires of oxygen, including covering with non-combustible materials, using foam, or inert gases.

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