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Direct ame contact is the transfer of heat energy via direct ame impingement or auto-exposure, such as occurs with a ame traveling upward and outward from a roof, window, or doorway to a neighboring building or exposure
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PHASES OF FIRE
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Temperature
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Development Growth Incipient Free Burning Time PHASES OF FIRE
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Smoldering
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There are three phases of re: incipient (growth), free burning (fully developed), and smoldering (decay) Each phase has its own unique characteristics and dangers to re ghters and should be understood thoroughly to enhance safety during re ghting operations inside buildings and structures These phases are part of the standard time/temperature curve, which helps in visualizing the heat energy and temperatures attained during a re
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Temperature of the standard test fire SMOLDERING PHASE INCIPIENT PHASE (Growth) FREE-BURNING PHASE (Fully Developed) (Decay)
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5 minutes=1000 degrees Fahrenheit 10 minutes=1300 degrees Fahrenheit 30 minutes=1550 degrees Fahrenheit 1 hour=1700 degrees Fahrenheit 2 hours=1850 degrees Fahrenheit 4 hours=2000 degrees Fahrenheit
Time of the standard test fire
THE STANDARD TIME TEMPERATURE FIRE CURVE
Incipient (Growth) Phase
Most res extinguished by re ghters are in this phase In this phase, the re is in the beginning, slow fuel combustion stage, with the oxygen content in the area still within the normal range (21 percent) There is limited heat being generated but high levels of smoke production and ammable carbon monoxide (CO) gas Physical destruction from re is limited to the immediate surrounding area In certain situations, the introduction of fresh air by re ghters entering the area of re can cause pent up CO gas to react violently and explode (backdraft), leading to serious injury while increasing the intensity of the re Also during this phase, there is the possibility of re gases reaching their ignition temperatures ( ashover) causing the entire area s contents to become suddenly engulfed in re, greatly increasing the temperature of the re and leading to the next phase of re, the free-burning phase
Free-Burning (Fully Developed) Phase
As re spreads throughout an area, more heat and smoke are generated and travel in an upward direction toward the ceiling During the free-burning phase, oxygen content in the area drops from 21 percent to approximately 15 percent, causing the volume of ames to eventually decrease, while smoke production continues to increase When the oxygen level falls below 15 percent, ame generation ceases and the re enters the next and last phase, the smoldering phase
Smoldering (Decay) Phase
During this phase, the oxygen content in the area is below 15 percent, causing the rate of heat production and active aming to decrease rapidly Combustibles
PART III: REVIEW FOR THE WRITTEN EXAMINATION
in the room have been largely consumed by the re and are no longer actively burning These combustibles, however, are still emitting large amounts of smoke and ammable gases If fresh air (oxygen) is introduced into the re area at this time, a backdraft situation is possible, since the in ux of oxygen will complete the re triangle and cause reignition of the ammable gas mixture in the area
TEMPERATURE Backdraft Flashover
Backdraft
TIME
INCIPIENT PHASE (Growth) FREE-BURNING PHASE SMOLDERING PHASE Fully Decay Developed
BACKDRAFT AND FLASHOVER TIMELINE
CLASSIFICATION OF FIRE
There are ve classi cations of re based on the type of fuel involved
Class A Fires
Class A res include res in ordinary combustibles (wood, wood products, paper, natural bers, rubber, and plastics) Extinguishing res in these types of materials requires water or foam or clean agents (inert gases) to absorb heat and smother the re or dry chemical extinguishing agents (multipurpose) to inhibit the chemical chain reaction
Class B Fires
Class B includes res in animal-based, saturated fat cooking oils and greases, ammable and combustible liquids, and ammable gases These res need carbon dioxide to exclude air (oxygen), and dry chemical extinguishing agents, clean agents, or foam to inhibit the release of combustible vapors
Class C Fires
Class C res are res in live electrical equipment These res require an extinguishing agent that is nonconductive Water mist (safe from electric
CHAP 8: FIRE SCIENCE BASICS
shock); dry chemical extinguishing agents; carbon dioxide, and clean agents should be used on these types of res
Note: When electrical equipment is deenergized, extinguishing agents for Class A and Class B res may be utilized
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