Ch. 7 Portable Fire Extinguishers

Aqueous Film Forming Foam (AFFF) Extinguishers

Class B fires, useful in combating fires in or suppressing vapors from small liquid fuel spills. Contains a specified amount of AFFF concentrate mixed with the water to produce a foam solution Air-aspirating foam nozzle that aerates the foam solution, producing a better-quality foam than a standard extinguisher nozzle provides.

Class D rating:

Class D agents cannot be given a multipurpose rating for use on other classes of fire.

Dry Powder Extinguishers

Class D combustible metals. Some applied with extinguisher, others applied with shovel or school. Create a smothering blanket

Wet Chemical Stored-Pressure Extinguishers

Class K fires, contain special potassium-based, low-pH agent formulated to operate on the principle of saponification in which the agent combines with the oils to create a soapy foam surface over the cooking appliance.

CO2 extinguishers are most effective in extinguishing _______________.

Class b and class c fires

Wet Chemical System

Extinguishing system that uses a wet-chemical solution as the primary extinguishing agent; usually installed in range hoods and associated ducting where grease may accumulate.

Water-Mist

In the fire service, water mist is associated with a fire extinguisher capable of atomizing water through a special applicator. Water-mist fire extinguishers use distilled water, while backpack pump-type water-mist extinguishers use ordinary water.

PASS application method:

Pull the pin, aim the nozzle at base of fire, squeeze the handles together to release the agent, sweep the nozzle back and forth to cover the burning material.

The method by which agents extinguish fire by oxygen exclusion is:

smothering

which of the following fire classifications would use the following agents for extinguishment: carbon dioxide, dry chemical and class b foam?

special hazard class b fires

Extinguishers for control and extinguish fires in deep fryers?

Wet Chemical stored-pressure extinguishers

Dry Powder

extinguishing agent suitable for use on combustible metal fires, Class D dry powder

Class C rating based on:

extinguishing agent will not conduct electricity.

Dry Chemical

extinguishing system that uses dry chemical as the primary extinguishing agent; often used to protect areas containing volatile flammable liquids. Used for Class A fires, class A foam.

Class B

flammable liquids; red square

Air-Aspirating Foam Nozzle

foam nozzle especially designed to provide the aeration required to make the highest quality foam possible; most effective appliance for the generation of low-expansion foam.

Pump-type water extinguishers are intended for use on ______________.

ground cover fires and also small Class A fires.

Whether a particular dry powder is applied with an extinguisher or with a scoop, it must be applied:

in sufficient depth to completely cover the area that is burning to create a smothering blanket.

Class A fire extinguisher rating

1-A through 40-A. 1-A is 1.25 gallons of water and 2-A is 2.5 gallons of water.

Class B fire extinguisher rating

1-B through 640-B; based on approximate square foot area of a flammable liquid fire a non-expert can extinguish.

remove extinguisher from service and replace if it is found to be deficient in weight by?

10%

Extinguisher with an air-aspirating nozzle that aerates the foam solution, producing a better-quality foam than a standard extinguisher nozzle:

AFFF extinguisher

what extinguisher prevents resignation by the vapor seal created by the film of water?

AFFF extinguisher

What extinguisher is suitable for use on Class A and Class B fires and is useful in combating fires in or suppressing vapors from small liquid fuel spills?

AFFF; aqueous film forming foam extinguisher

Halogenated Extinguishing Agents

Chemical compounds (halogenated hydrocarbons) that contain carbon plus one or more elements from the halogen series. Halon 1301 and Halon 1211 are most commonly used as extinguishing agents for Class B and Class C fires. Also known as halogenated hydrocarbons.

Water-Mist Stored -Pressure Extinguishers

Use deionized water as the agent and nozzles produce a fine spray instead of a solid stream. Class A extinguisher safe for Class C. Fine spray enhances cooling and soaking characteristics of water and reduces scattering of the burning materials.

Saponification

a phenomenon that occurs when mixtures of alkaline-based chemicals and certain cooking oils come into contact resulting in the formation of a soapy film. Potassium base, low pH.

Stored-Pressure Water Extinguishers

air-pressurized water (APW) extinguishers or pressurized water extinguishers, useful for all types of small Class A fires. Also used for extinguishing confined hot spots during overhaul operations.

Extinguishing Agent

any substance used for the purpose of controlling or extinguishing a fire.

Class B rating based on:

approximate square foot area of a flammable liquid fire that a non expert operator can extinguish.

fire codes require that portable extinguishers be inspected ____________.

at least once a year.

Factors in selecting proper fire extinguisher

atmospheric conditions, rating of the extinguisher, size and intensity of fire

the method by which agents extinguish fire by interrupting the chemical chain reaction is:

chain breaking

Most common combinations of portable fire extinguishers

class ABC, class AB, class BC

AFFF extinguishers

class B fires

Which of the following fires can be identified by the bright white emissions from the combustion process?

class d fires

which of the following fire classifications are extinguished by wet chemicals that are used in the extinguishing systems and portable extinguishers for these specific types of fires?

class k fires

Class K Ratings

class k rated extinguishers must be capable of saponifying oils. capable of extinguishing a fire with a 2.25 square feet surface area meet the minimum criteria.

What extinguisher is pressurized with argon gas and effectively cools and smothers fires in Class A and Class B fuels

clean agent extinguishers

highly sensitive computer equipment extinguishers:

clean agent extinguishers, multiple-use extinguishers, carbon dioxide extinguishers

Class D

combustible metals; yellow star

Class K

cooking oils; black hexagon

the method by which agents extinguish fire by reducing the burning material below its ignition temperature is:

cooling

what to check for on inspection tag?

date of previous inspection, maintenance or recharge

Dry Chemical Extinguishers

dry chem for use on Class A-B-C fires and/or Class B-C fires. Most common portable fire extinguishers used today. Common used dry chemicals: sodium bicarbonate, potassium bicarbonate, urea-potassium bicarbonate, potassium chloride, mono ammonium phosphate.

Extinguishers for use on class ABC fires and/or class BC fires and are among the most portable fire extinguishers in use today:

dry chemical extinguishers

Class A rating based on:

duration and range of the discharge and amount of extinguishing agent.

Class C

electrical equipment; blue circle

Clean agent extinguishers are useful for:

energized electrical equipment, computer equipment

Pump-Type Water Extinguishers

intended primarily for use on ground cover fires, also used for small Class A fires.

Carbon Dioxide Extinguishers

most effective on extinguishing Class B and Class C fires. discharge in gas form, limited reach and can be dispersed upwind. DO NOT TOUCH HORN BEFORE CHARGE HAS DISSIPATED, CAN RESULT IN SHOCK

Metal fire extinguishing agents

no single agent will control or extinguish fires in all combustible metals

Class A

ordinary combustibles; green triangle

Fire extinguisher

portable fire fighting device designed to combat incipient fires.

what extinguisher is intended for use on small class a fires only and are equipped with either a single or double acting pump?

pump-type water extinguishers

Clean Agent Extinguishers

replaces halogenated extinguishing agents. Effectively cool and smother Class A and Class B fuels and can also be used on Class C fires.

the method by which agents extinguish fire by forming an oxygen-excluding soapy foam is:

saponification

what extinguisher is used for extinguishing confined hot spots during overhaul operations

stored-pressure water extinguishers

Class D Ratings

test fires vary with type of combustible metal being tested. factors include: reactions between the metal and the agent toxicity of the agent toxicity of the fumes produced and the products of combustion time to allow metal to burn completely without fire suppression compared to the time to extinguish the fire using the extinguisher.

Class C ratings

tested for electrical nonconductivity. Class C rating confirms the extinguishing agent will not conduct electricity and is assigned in addition to the rating for Class A and/or Class B fires.

Clean agent extinguishers are approved by the US Environmental Protection Agency (EPA).

true

what extinguisher is safe to use on energized electrical equipment?

water-mist stored-pressure extinguishers

what extinguisher uses deionized water as the agent and nozzles that produce a fine spray instead of a solid stream?

water-mist stored-pressure extinguishers