5 Flashcards
are called handheld active fire protection systems in
the form of devices that apply agents or substances that are designed to control fire or to extinguish it in full.
FIRE EXTINGUISHERS
It either reduces or cools the temperature, smothers the heat, replaces the oxygen or a combination of the three so that a fire could be extinguished.
FIRE EXTINGUISHERS
They could also be seen as mechanical instruments made of metal that contain chemicals, fluids, or gasses that serve the purpose of halting the growth or the continuous
burning of a fire.
FIRE EXTINGUISHERS
TYPES OF FIRE EXTINGUISHERS (7)
WATER FIRE EXTINGUISHERS
FOAM EXTINGUISHERS
DRY CHEMICAL
LIQUEFIED FIRE EXTINGUISHER
SODA-ACID FIRE EXTINGUISHER
VAPORIZING LIQUID FIRE EXTINGUISHER
CARBON DIOXIDE
- contains H20 and labeled with a RED color
WATER FIRE EXTINGUISHERS
WATER FIRE EXTINGUISHERS
Used mostly for:
Not used for:
CLASS A FIRES (Solid combustibles such as wood, paper, cloth) AND SOMETIMES IN CLASS B FIRES
CLASS C FIRES
- contains a mixture of water substances and foam materials (composed of sodium carbonate and aluminum sulfate) that creates a blanket that could smother a fire
FOAM EXTINGUISHERS
FOAM EXTINGUISHERS-
Used mostly for:
Not used for:
CLASS A FIRES (Solid combustibles such as wood, paper, cloth) AND CLASS B (Flammable liquids such as diesel and fuel) FIRES
CLASS C and D FIRES
- contains a dry chemical or foam which mostly consists of
phosphates and sulfates which interrupts the chemical reaction of the production of a fire.
DRY CHEMICAL
DRY CHEMICAL-
Used mostly for:
ALL CLASSES OF FIRES
contains liquefied gasses such as Carbon Monoxide gas in order to put out fires.
LIQUEFIED FIRE EXTINGUISHER
LIQUEFIED FIRE EXTINGUISHER-
Used mostly for:
CLASS A, B, and C (caused by electrical anomalies) FIRES
Working principle: This extinguisher contains 3 containers one with water and one with Sodium Bicarbonate and a separate container with Sulfuric acid. When the extinguisher is upside down the container with the Sulfuric acid breaks and mixes with Sodium Bicarbonate. This mixture produces Carbon Dioxide which pressurizes the extinguisher itself thus ejecting the substances
out of the extinguisher. The mixture of Water, Sodium Bicarbonate, and Carbon Dioxide smothers the flames and replaces the Oxygen.
SODA-ACID FIRE EXTINGUISHER
SODA-ACID FIRE EXTINGUISHER-
Used mostly for:
CLASS A FIRES
- contains non-conducting liquid usually referred to as Carbon tetrachloride or Chlorobromomethane.
VAPORIZING LIQUID FIRE EXTINGUISHER
VAPORIZING LIQUID FIRE EXTINGUISHER- contains non-conducting liquid usually referred to as
Carbon tetrachloride or Chlorobromomethane.
The principle of this extinguisher is by putting out fires by the creation of a blanket which smothers the fire due to the vaporization of the contents of the extinguisher when it is subjected to the heat of the fire.
VAPORIZING LIQUID FIRE EXTINGUISHER
V APORIZING LIQUID FIRE EXTINGUISHER
Used mostly for:
CLASS B AND C FIRES
- contains CO2 which mostly removes the presence of sources of Oxygen near a fire.
CARBON DIOXIDE
CARBON DIOXIDE-
Used mostly for:
CLASS B AND C FIRES
are materials or substances that are used to suppress or extinguish fires.
EXTINGUISHING AGENTS
These agents are selected based on their ability to interrupt
the combustion process in different ways; such as cooling the fire, creating a barrier between the fuel and the oxygen, or removing one or more elements of the fire triangle.
EXTINGUISHING AGENTS
EXAMPLES OF EXTINGUISHING AGENTS
Aqueous Film Forming Foam (AFFF)
CARBON DIOXIDE
HALON 1211
MULTI-PURPOSE DRY CHEMICALS
- is a synthetic foam-forming liquid designed for use with fresh water.
Aqueous Film Forming Foam (AFFF)
