Answer :
Final Answer:
Class D fire extinguishers are intended for option d. metal and metal hydride fires.
Explanation:
Class D fire extinguishers are specifically designed for fires involving metals and metal hydrides. These extinguishers are not suitable for ordinary combustibles (Class A fires), flammable liquids (Class B fires), electrical fires (Class C), or kitchen fires (Class K). The use of Class D fire extinguishers is critical in environments where there is a risk of fires involving metals such as magnesium, titanium, sodium, or lithium, as well as their hydride derivatives.
In such situations, using water or standard fire extinguishing agents can exacerbate the fire, as they may react violently with the metal, producing hydrogen gas and intensifying the blaze. Class D extinguishers typically contain agents like sodium chloride, graphite powder, or other specially formulated materials that can effectively smother metal fires by excluding oxygen. These extinguishers are an essential safety measure in industrial settings where metalworking or handling of reactive metals is prevalent.
Understanding the correct fire extinguisher class for a specific fire type is crucial for safety and successful fire suppression. Using a Class D fire extinguisher for any other fire class can be ineffective and even dangerous. Always ensure that the appropriate fire extinguishing equipment is readily available and well-maintained in areas with potential fire hazards involving metals and metal hydrides. The correct answer is option d.
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