Lecture_8.1_Fire_Protection_2 - AE202 Lecture 8.1...

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AE202 Lecture 8.1 Principles of Fire Protection Theory of Fire Combustion - A reaction which is continuous combination of o a ____________ (reducing agent) with o an oxidizing agent, prominent among which is ____________.. Two modes of combustion 1. Non-flaming type - Glowing and deep-seated embers Fuel is in the form of incandescent _______________ 2. Flaming type - Associated with high burning rates including explosion. Fuel is in the form of ___________. The combustion process o + heat generated o heat lost to environment If heat generated is excessive, then ________________ ______________.. If heat loss is excessive, then _________ _______________ ___________. Heat generated _______ sensible heat of effluent _______ radiant heat flux
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Method of extinguishing 1. By cooling (water) - Straight hose (hose stream too forceful) 2. Heat removal o Sensible heat o Latent heat 3. Volumetric expansion o 2500:1 o Displaces ___________ o Water stream can induce ventilation (used during fire fighting 4. Fire extinguisher – addition of surfactants, alkali carbonate o Retards run off o Prolongs soaking 5. By oxygen dilution (air is 20.9% oxygen) o Water/steam o CO 2
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