Скачать или смотреть Types of fire extinguishers/Types of fire/ Classification of fire? In urdu #27 May 23 2020

Classification of fires
: • Class A – solid materials, usually organic, such as paper, wood, coal and textiles.
•Class B - flammable liquids, such as petrol, oil and solvents.
• Class C – gases, such as methane, propane and acetylene.
• Class D – metals, such as aluminium or magnesium.
• Class F – high temperature fats and oils, such as cooking fat fire.

The following types of portable fire extinguisher are commonly found in workplaces

: • Water – suitable for Class A fires. Works by cooling the fire. Standard water extinguisher is not suitable for use on Classes B, D or F fires or live electrical equipment (risk of shock). Certain specialised water extinguishers are available for use on Class B and F fires.
• Carbon dioxide – suitable for Class B fires, especially fires involving live electrical equipment. Works by smothering the fire. Not suitable for use on Class D fires. Must be used with care because the body of the extinguisher gets very cold during use and can cause a freeze-burn injury.
• Foam – suitable for Class A and B fires. Works
by smothering the fire or by preventing combustible vapours from mixing with air.
• Dry powder – suitable for all classes and use on live electrical equipment. Works by smothering the fire. Can be very messy

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Classification of fires?

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Five types of extinguishers
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Water fire extinguishers
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Foam fire extinguishers
Carbon oxide fire extinguishers
Colors of fire extinguishers