Explain Fire
Triangle?
Fire Triangle is a diagram which represents the three
components that creates a fire such as Oxygen or Air, Fuel and Heat (source of
ignition).
Absence of any of the components, fire would not occur.
What is the different
class of fire/types of fire?
Class of Fire: Class
A - Carbon based combustible materials (wood, rubber, paper, fabric, etc.)
Class B - Liquid (petrol, oil, thinners etc.)
Class C - Gases (acetylene, propane, LPG, Butane etc.)
Class D - Metals (Sodium, potassium, magnesium) require
special extinguishing agent.
Class E – Fire involving energized electrical equipment as
electrical cable, electrical motor etc.
What is fire
extinguishing principle?
Fire extinguishment principle involves elimination one or
more of the components forming a Fire Triangle.
Starving: The removal
of fuel to the point so that nothing remains to burn. Example: turn off valves.
Smothering: The removal of air or oxygen to point the so that combustion ceases.
Example: fire blanket, foam and sand.
Cooling: Cooling of fuel to the point so that combustion
vapours are no longer produced, and temperature is dropped below ignition
point. Example: water spray etc.
Inhibiting the Flame
Chain Reaction: It is represented by fire tetrahedron shown below. In this
method by arresting the chemical chain reaction in the flame zone, combustion
process is terminated, e.g. introduce a Dry Chemical Extinguisher, inert agent
etc.
What is transmission
of heat? OR What are the methods / modes for fire can spread?
Transfer of heat is responsible for initiation,
continuation, and extinguishment of most fires. Fire can spread by one or more
of the following modes:-
Conduction: Heat from one body is transferred to another by
direct contact.
Convection: Heat is transferred by a circulating medium
either a gas or liquid.
Radiation: Heat is transferred from one body to another by
heat rays a medium in between.
