Class D Fires in .NET framework

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Class D Fires
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Class D res are res in combustible metals or combustible metal alloys They involve extremely hot temperatures and highly reactive fuels Examples of combustible metals include magnesium, lithium, sodium, potassium, sodium potassium alloys, zirconium, uranium, and aluminum There is no one type of extinguishing agent for all kinds of combustible metals Some of the most common extinguishing agents include sodium chloride (table salt), copper-based dry powder, nely powdered graphite (preferred on lithium res), and very dry sand These materials must act as a heat absorbing medium as well as a smothering agent without reacting with the burning metal
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Class K Fires
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Class K res are res in unsaturated fat vegetable cooking oils used today with more ef cient cooking appliances These oils burn hotter than animalbased, saturated fat cooking oils and remain at high temperatures longer when used with new, thermally insulated cooking and frying equipment They require wet chemical extinguishing agents
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EXTINGUISHING AGENTS Water
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Fire ghters extinguish most res using water It is usually available in abundance at or near the re Water can be delivered onto the re in a number of ways: hand lines stretched from the apparatus, hand lines stretched from a standpipe system located inside a building, sprinkler system, water mist system, master deluge nozzles, distributors, etc Water extinguishes re by cooling the material (absorption of heat), smothering (steam generation), emulsi cation (agitation of insoluble liquids to produce a vapor inhibiting froth), and dilution (adding water to reduce the concentration of a burning soluble liquid and thereby raising its ashpoint) A review of the advantageous and disadvantageous properties of water follows
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ADVANTAGEOUS PROPERTIES OF WATER
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There are several advantages to water as an extinguishing agent Some of the characteristics of water that make it advantageous in extinguishing res are listed below
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PART III: REVIEW FOR THE WRITTEN EXAMINATION
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Heavy, stable liquid at ordinary temperatures High speci c heat The heat capacity is given in terms of the mass of the substance in pounds and is the amount of heat required to raise the temperature of 1 lb of a substance 1 F) All solids, liquids, and gases have speci c heats Only two liquids have higher speci c heats than water: ammonia and ether One BTU is required to raise the temperature of 1 lb of water 1 F To raise the temperature of 1 lb of water from 32 F to 212 F requires 180 BTU Latent heat of fusion Melting of 1 lb of ice into water at 32 F absorbs 1434 BTU Latent heat of vaporization The latent heat of vaporization is the conversion of 1 lb of water into steam at a constant temperature with the absorption of 9703 BTU Conversion to steam The conversion of liquid water to steam increases its volume approximately 1,600 times, which displaces an equal volume of air, thereby reducing the volume of oxygen available for the oxidation reaction
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DISADVANTAGEOUS PROPERTIES OF WATER
Water also has disadvantages, some of which are listed below
It conducts electricity It has low viscosity, which means it runs off smoldering material readily It has high surface tension, since it has poor penetration qualities It is transparent to radiated heat It freezes at relatively high temperature It displaces ammable liquids It reacts violently with combustible metals
Foam
Mechanical foam used today is a mixture of air, water, and liquid foam concentrate (protein- or synthetic-based) The combination of these three ingredients produces a bubble blanket solution that will ow over and around combustible solids and liquids Unlike water, foam is lighter than ammable liquids and will oat on the surface of the liquid Foam is used on both Class A and Class B res It will conduct electricity, however, and should not be used on energized electrical equipment Foam extinguishes res in four ways: cooling; smothering; suppressing vaporization, and separating the ames from the fuel surface, thereby reducing radiated heat feedback
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