Chapter 8 - Portable Fire Extinguishers

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Questions and Answers

What is Ammonium Phosphate used for?

Extinguishing agent for Class A fires

Extinguishing agent for Class B fires

Extinguishing agent for Class C fires

All of the above (correct)

What does Aqueous Film-Forming Foam (AFFF) create on the surface of hydrocarbon fuels?

Noncombustible film

Vapor-suppressing foam (correct)

Water-based solution

Thermal barrier

What does a Carbon Dioxide (CO2) Fire Extinguisher use as its extinguishing agent?

Carbon dioxide gas

What distinguishes a Cartridge/Cylinder Fire Extinguisher from other types?

The expellant gas is in a separate container. Signup and view all the answers

What type of fire does Class A refer to?

Ordinary combustible materials Signup and view all the answers

What types of materials are involved in a Class B fire?

Flammable liquids Signup and view all the answers

What does a Class C fire involve?

Energized electrical equipment Signup and view all the answers

What type of materials are involved in a Class D fire?

Combustible metals Signup and view all the answers

What kind of fire does a Class K extinguisher target?

Cooking appliances with combustible cooking media Signup and view all the answers

What is a Clean Agent in fire extinguishing?

Electrically nonconducting and gaseous extinguishing agent Signup and view all the answers

What is the function of the cylinder in a fire extinguisher?

To store the extinguishing agent Signup and view all the answers

What is a Dry-Chemical Fire Extinguisher?

An extinguisher using solid particles to extinguish fires Signup and view all the answers

What is the purpose of a Dry-Powder Extinguishing Agent?

To extinguish Class D fires Signup and view all the answers

What does an Extinguishing Agent do?

Stops the combustion process Signup and view all the answers

What denotes Extra (High) Hazard Locations?

Increased amounts of Class A and B combustibles Signup and view all the answers

What is the definition of Fire Load?

The weight of combustibles in a fire area Signup and view all the answers

What is a Halogenated-Agent Fire Extinguisher?

An extinguisher using a halogenated extinguishing agent Signup and view all the answers

What chemical name corresponds to Halon 1211?

Bromochlorodifluoromethane Signup and view all the answers

What is the function of a Handle on a portable fire extinguisher?

To hold and carry the extinguisher Signup and view all the answers

What is the role of the Horn on a CO2 type fire extinguisher?

To discharge the extinguishing agent Signup and view all the answers

What does Hydrostatic Testing refer to in fire extinguishers?

Pressure testing for safety and integrity Signup and view all the answers

Study Notes

Fire Extinguishing Agents

Ammonium Phosphate: Used in dry-chemical fire extinguishers; effective on Class A, B, and C fires.
Aqueous Film-Forming Foam (AFFF): Solution forming vapor-suppressing films on hydrocarbon fuels; consists of surfactants.
Carbon Dioxide (CO2) Fire Extinguisher: Utilizes CO2 gas; rated for Class B and C fires.
Dry Chemical Fire Extinguisher: Employs solid particles (sodium bicarbonate, potassium bicarbonate, ammonium phosphate) for Class B and C fires, with some rated for Class A.
Clean Agent: Nonconducting, volatile extinguishing agents that evaporate without residue.

Fire Classifications

Class A Fire: Involves ordinary combustibles, e.g., wood, paper, cloth.
Class B Fire: Concerns flammable and combustible liquids such as greases, oils, and solvents.
Class C Fire: Involves energized electrical equipment.
Class D Fire: Combustible metals like magnesium and sodium ignite these fires.
Class K Fire: Cooking-related fires involving vegetable or animal oils and fats.

Fire Extinguisher Types and Components

Cartridge/Cylinder Fire Extinguisher: Features separate containers for the expellant gas and extinguishing agent.
Dry-Powder Extinguishing Agent: Typically used for Class D fires; examples include sodium chloride and graphite powders.
Dry-Powder Fire Extinguisher: Employs powder to extinguish Class D fires by crusting and smothering.
Halogenated-Agent Fire Extinguisher: Utilizes halogenated agents to extinguish fires.

Key Fire Extinguisher Features

Cylinder: Storage component for the extinguishing agent.
Handler: Used to hold and carry portable extinguishers.
Horn: Tapered nozzle found on CO2 extinguishers for directing the agent.

Additional Concepts

Fire Load: Measurements of combustibles in a fire area, important for assessing fire risk.
Hydrostatic Testing: Essential safety process for pressure testing fire extinguishers.
Film-Forming Fluoroprotein (FFFP) Foam: Combines proteins and fluorinated surfactants for vapor suppression on hydrocarbon surfaces.
Extra (High) Hazard Locations: Spaces exceeding normal combustibles and flammables, requiring specialized fire safety measures.

Halogenated Agents

Halogenated Extinguishing Agent: Liquefied gases that interrupt combustion reactions.
Halon 1211: A specific halogenated agent with multipurpose ABC rating effective against flammable liquid fires, recognized by its chemical name bromochlorodifluoromethane (CBrClF2).

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Description

Explore the important definitions and concepts related to portable fire extinguishers in this flashcard quiz. Learn about various extinguishing agents and their applications across different fire classes. Perfect for students of fire safety and emergency response.