Flashcards in IFSTA(5th)-Chapter 6 Deck (78):
Portable Fire Extinguishers are designed to b used on _______ fires.
incipient or early growth
Std. for Portable Fire Extinguishers
extinguishing agents work by at least one of the following mechanisms
interrupting the chemical reaction
Std. for Automotive Fire Apparatus
NFPA 1901 requires _____ approved port. fire extinguishers with ______ .
NFPA 1901 requires at least a rating of ______ for a dry chemical extinguisher and a _______ rating for a CO2 extinguisher.
NFPA 1901 also requires one ______ water extinguisher for class A fires.
2.5 gallon or larger
Water Extinguishers r 4
class A fires
AFFF is for ____
class A or B fires
Halon 1211 and Halon 1301 r 4
class B or C fires
Clean Agent FE-36 is for _____
class A, B, or C fires
CO2 is used for _____
class B or C fires
Dry Chemical Extinguishers r 4 ___
class B or C fires
Multi-purpose dry chem. is for ___
class A, B, or C fires
Dry Powder is used for _____
class D fires
Wet Chemicals such as Potassium Acetate are used for _____ .
class K fires
4 different dry chemical agents
Multi-Purpose Dry Chem. agent
extinguishing agents primary method of extinguishment
water - cooling
CO2/Foam/Wet Chem/Dry Powder - O2 depletion
clean agent/dry chem - interrupts chemical reaction
3 expelling mechanisms
Class A extinguishing agents
class A foam or AFFF
Class B extinguishing agents
class B foam (AFFF for example)
Class C extinguishing agents
dependent on what is burning. first, de-energize electrical source
Class D extinguishing agents
Class K extinguishing agents
ability of a substance to conduct an electrical current.
mixture of two or more metals (or a metal and a non-metal) that are fused/dissolved into each other to enhance the properties of the base metal.
air pressurized water extinguishers
Water Mist stored pressure extinguishers use ________ as the agent and produces a ______ instead of a solid stream. They are ______ to use on class C fires.
aqueous film-forming foam
when combined with water it forms a complete vapor barrier over fuel spills and fires.
highly effective on hydrocarbon fuels.
ineffective on polar solvents (flammable liquids that r water-soluble).
AKA "light water"
Air-Aspirating Foam Nozzle
designed to provide aeration to provide the highest quality foam
AFFF can be applied by
environmental protection agency
5 facts about "clean agents"
are discharged as a rapidly evaporating liquid that leaves no residue.
are non-conductive so they can be used on class A, B, and C fires.
pressurized with argon gas.
approved by the EPA.
are designed to specifically replace Halon 1211.
4 examples of clean agents
CO2 is stored under ______ as a liquified gas ready for release at any time.
it's own pressure
CO2 discharges at _____ temp.
2 reasons not to touch a CO2 horn during discharge
static electricity builds up
Dry chemicals are mixed with _____ during manufacture to prevent caking.
small amounts of additives that make them resistant to moisture
gas, liquid, or solid material that can burn, irritate, or destroy human skin and can severely corrode steel.
employ a pressure cartridge that pressurizes the tank after a plunger is pushed.
2 types of cartridge-operated extinguishers
dry nitrogen(for freezing temps)
Wheeled dry chem extinguishers must have their _____ before the extinguisher is pressurized.
Wheeled dry chem extinguishers have ______ nozzle reaction.
Dry powder is applied _______
gently and in sufficient depth to create a smothering blanket.
What extinguishing agent when applied to class D fires causes a violent reaction, intensifies combustion, and causes bits of molten material to spatter?
the # on an extinguisher
underwriters laboratories inc.
Class A ratings
A=1.25gallons of water would b required
Class B ratings
B=1 square foot of a class B fire that a non- expert can extinguish.
For an extinguisher to be rated for Class C fires, the extinguishing agent must be _______ .
Extinguishers are classified for their _______ .
water used to extinguish fires in these cribs determine class A ratings
Class D extinguishers are not given a _______ and _______ be used on any other class fire.
2.25 square feet
minimum surface area of a cooking fire that must be extinguished to meet the minimum criteria for a class K rating.
Class of Fire Symbols
Extinguishers suited for______ are identified by combinations of letters and numbers.
more than 1 class of fire
8 factors to selecting the proper fire extinguisher
class of fire
rating of extinguisher
hazards to be protected
size and intensity if fire
life hazards/operational concerns
ease of handling
availability of trained personnel
Operate an extinguisher from _____ the fire and your exit.
4 checks of an extinguisher prior to immediate use
is it pressurized
weight(is the agent inside?)
hose/nozzle in place
Approach fires from ____wind.
After an extinguisher has been completely discharged, _____ .
lay it on its side
How often must extinguishers be inspected?
at least annually
3 factors that affect the value of an extinguisher
ease of use
8 checks for a fire extinguisher inspection
in proper location and accessible.
nozzle/horn for cracks/obstructions/dirt/grease.
extinguisher cylinder for damage.
legible operating instructions.
check locking pin/tamper seal.
full of agent and fully pressurized.
inspection tag current.
condition of hose/fittings.
29 CFR 1910.157 Subpart "L" (c) (5)
required employers to remove all obsolete extinguishers by January 1982
halogenated hydrocarbons that contain carbon plus one or more elements from the halogen series.
Halogenated Agents are usually installed to protect _______ .
highly sensitive computer equipment
generic term for halogenated hydrocarbons
Halon fire extinguishers are ______ allowed.
Halogenated Agents extinguish fire by ______ .
interrupting the chemical chain reaction
halogenated vapor is ______ .
Halons _____ leave any residue.
replaced by FE-36 hexaflouropropane.
replaced by FE-241 chlorotetrafluoroethane and FM-200 heptafluoropropane.
Do not use _______ in unvented, confined spaces because they might decompose and create toxic components.