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FIRE HAZARDS

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baejuhyeoned's version from 2017-01-16 20:26

Section

Question Answer
Class C, Class K, Class B, Class D, Class AIDENTIFY THE FIRE TYPE
Class CFire that involves powered electrical equipment like home appliances, motors and transformers
Class CFire involving inflammable gases under pressure including liquefied gases such as methane, hydrogen, acetylene, LPG etc.
Class KFire that involve cooking oil and greases
Class KA very dangerous fire type
Class BFire that involve combustible liquid such as paints alcohols, petroleum oil
Class BFire involving inflammable liquids or liquefiable solids such as petrol, kerosene, acids, solvent etc.
Class DFire that involve combustible metals such as aluminum, lithium, sodium , titanium and zirconium
Class DFire involving combustible metals, such as magnesium, zinc, sodium, aluminum, potassium, radioactive material etc. When the burning metals
Class AFire that involve unplugged home appliances, wood, paper and plastic
Class AFire involving solid combustible materials of organic nature such wood, paper, rubber, plastic, cloth which requires cooling effect.
(1) P- Pull the pin, (2) A- Aim the hose/ nozzle at the base of the fire from safe distance, (3) S- Squeeze the lever to dispense extinguishing agent, (4) S- Sweep the hose/nozzle sideways until fire is extinguishedHow to use a Fire Extinguisher
(1) Smoke & fumes, (2) Heat & flames, (3) Building debris, (4) Injury while escaping fireHazards and risks of fire
1250°CHeat & flames can be up to degrees?
FIREIt is a chemical chain reaction which takes place with the evolution of heat and light.
Oxygen, Heat, FuelESSENTIALS OF FIRE
FUELAny material capable of producing vapors and burns
Solid, Liquid, GasTHREE (3) TYPES OF FUEL
OxygenAll substances need this to burn
OxygenTwenty One percent (21%) of our atmosphere is composed of this
HEATForm of Energy that raises temperature, measured in degrees to signify intensity.
(1) Open Flames, (2) Hot Surfaces, (3) Sparks and Arcs, (4) Friction, (5) Electrical Energy, (6) Mechanical Energy, (7) Compression of Gases 7 Sources of Heat
HEAT TRANSFER PRINCIPLELaw of Heat Flow - Heat tends to move from a hot substance to a cold substance
ConductionIt occurs only in solids i.e. metallic objects
ConductionDirect contact of substance
ConvectionIt occurs both in liquids & gases due to convection current.
ConvectionFlow of liquid and gas
RadiationThese are heated rays emanating from the hot object.
RadiationInvolves electromagnetic wave like sunlight or flame in fire
(1) Ignition/Incipient Phase, (2) Free Burning Phase, (3) Hot Smoldering Phase3 Phases of Fire
Ignition/Incipient PhaseBeginning of fire
Ignition/Incipient Phaseoccurs when heat, fuel, oxygen come together and generate more heat than is dissipated
Free Burning PhaseAdequate oxygen must be available
(1) Oxygen supply, (2) Amount/type of fuel, (3) Container size/structure, (4) InsulationFire growth is affected by container structure
(1) Incipient, (2) Free Burning, (3) Flashover, (4) Smoldering4 Stages of FIRE
FlashoverSimultaneous combustion of all combustible materials in a confine space
Flashoveris the transition in which room temperature reaches a point at which all surfaces ignite
Confined spacesDetermined by air supply
OutdoorsDetermined by fuel supply
Smoldering StageOccurs when available fuel is exhausted or oxygen level drops at below 16%
BACKDRAFTSmoke explosion through the sudden introduction of air.
(1) Starvation, (2) Smothering, (3) Cooling, (4) Breaking of Chain Reaction4 PRINCIPLES OF FIRE EXTINCTION
StarvationRemoval of unburned material from the fire area
SmotheringCutting off the supply of oxygen from fire area
CoolingRemoval of heat from the burning material/fire area
Breaking of Chain ReactionThis is a chemical process
EXTINGUISHERSOne of the most common fire protection appliances in use today.
EXTINGUISHERSCan extinguish a small fire in much less time
EXTINGUISHERS Known as “First aid fire fighting equipment”
(1) Water and Foam, (2) Carbon Dioxide, (3) Dry Chemical, (4) Wet Chemical, (5) Halogenated or Clean Agent, (6) Dry Powder, (7) Water Mist7 Types of Fire Extinguishers
Water and FoamAn extinguisher which is Water-remover heat element
Water and Foamfor Class A fires only - they should not be used on Class B or C fires.
Carbon DioxideAn extinguisher which removes the oxygen element of the fire triangle and also be removing the heat with a very cold discharge.
Carbon Dioxide can be used on Class B & C fires. They are usually ineffective on Class A fires.
Dry ChemicalAn extinguisher that interrupts the chemical reaction of the fire triangle.
Dry ChemicalEffective on Class A, B, & C fires.
Dry Chemical creates a barrier between the oxygen element and the fuel element on Class A fires.
Dry Chemicalfor Class B & C fires only.
Wet Chemicalnew agent that extinguishes the fire by removing the heat of the fire triangle and prevents re-ignition by creating a barrier between the oxygen and fuel elements.
Wet ChemicalClass K extinguishers
Wet ChemicalSome may also be used on Class A fires in commercial kitchens.
Halogenated or Clean Agenthave halon agents as well as the newer and less ozone depleting halocarbon agents.
Halogenated or Clean AgentInterrupts the chemical reaction of the fire triangle
Halogenated or Clean AgentClean agent extinguishers are primarily for Class B & C fires.
Halogenated or Clean AgentSome larger clean agent extinguishers can be used on Class A, B, and C fires
Dry Powdersimilar to dry chemical except that they extinguish the fire by separating the fuel from the oxygen element or by removing the heat element of the fire triangle.
Dry Powderare for Class D or combustible metal fires, only
Water Mistremove heat element of the fire triangle.
Water Mistan alternative to the clean agent extinguishers where contamination is a concern.
Water Mistare primarily for Class A fires, although they are safe for use on Class C fires as well.
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Section 2

Question Answer
GasesNatural Gas
GasesPropane
GasesButane
GasesAcetylene
LiquidsGasoline
Liquids Turpentine
Liquids Alcohol
Liquids Kerosene
SolidsWood
SolidsCoal
Solids Paper
SolidsPlastic
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