Questions and Answers
What type of fires are foam portable extinguishers designed to combat?
Class-A fires involving ordinary combustibles
Which type of foam extinguisher is highly effective against Class-B and C fuel fires?
Wet Chemical Foam Extinguisher
What is the main function of Alcohol Resistant AFFF Foam Extinguishers?
Create a layer of foam over the fire's surface to prevent oxygen from reaching the flames
What is the key agent in Liquid Protein Film Forming Foam Extinguishers?
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How do you use a wet chemical foam extinguisher effectively?
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Why are Alcohol Resistant AFFF Foam Extinguishers not suitable for Class-A fires?
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What is a crucial safety consideration when using portable extinguishers for switchboard fires?
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Why is it essential for extinguishers to be easily accessible and located away from electrical sources in switchboard fire situations?
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Why is it important for extinguishers to be of an appropriate size in order to tackle specific types of fires?
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What is the significance of regular inspections and maintenance of portable extinguishers in relation to switchboard fires?
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How can organizations effectively prevent and tackle switchboard fires according to the text?
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In what way do portable extinguishers play a crucial role in fire safety in switchboard fire situations?
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Which type of portable extinguisher is specifically designed for switchboard fires and is more effective than traditional dry-chemical extinguishers?
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Why are Carbon Dioxide (CO2) Extinguishers suitable for use in switchboard fires involving live electrical equipment?
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What is the primary reason why Halon extinguishers have been replaced in tackling electrical fires?
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Which class of fires are Dry-Chemical Extinguishers (Class D) primarily meant to extinguish?
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What makes Metal-Foam Extinguishers effective for use in switchboard fires?
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Why are Carbon Dioxide (CO2) Extinguishers preferred for switchboard fires involving live electrical equipment?
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Study Notes
Portable Foam Extinguishers
Foam portable extinguishers are designed to combat Class-A fires, which involve ordinary combustibles like wood, cloth, paper, rubber, coal, and light structural materials. These fire extinguishing agents are categorized into three types: wet chemical, alcohol resistant AFFF, and liquid protein film forming.
Wet Chemical Foam Extinguishers
Wet chemical foam extinguishers are highly effective against class B and C fuel fires. They contain potassium salts of fatty acids and hydroxides that create a frothy mixture that cools the burning material and prevents re-ignition. When using a wet chemical foam extinguisher, aim for the base of the fire, spraying from side to side until it is completely out.
Alcohol Resistant AFFF Foam Extinguishers
Alcohol resistant Aqueous Film Forming Foam (AFFF) extinguishers are used primarily for Class-B and -D fires, such as electrical, flammable liquids, and flammable metal fires. They work by creating a layer of foam over the fire's surface, preventing oxygen from reaching the flames and allowing heat to dissipate. To use an AFFF foam extinguisher, aim directly at the fire's base and sweep from left to right until the flame goes out.
Liquid Protein Film Forming Foam Extinguishers
Liquid protein film forming foam extinguishers are designed for Class-A fires involving organic solids. They produce foam that forms a barrier between the burning material and the air. To operate this type of foam extinguisher, direct the stream towards the base of the fire and keep sweeping until the flame disappears.
It is crucial to understand the different categories of foam extinguishers and their appropriate applications. Knowing how to use these tools effectively can save lives and reduce property damage during emergency situations involving fires.
