Class D fire extinguisher
- Class D fire extinguisher
A Class D fire extinguisher is used to extinguish metal fires. The fire extinguisher contains either sodium chloride, graphite or copper powder and pressurized with nitrogen.
odium chloride
A special blended sodium chloride based dry powder extinguishing agent. Heat from the fire causes it to cake and form a crust excluding air and dissipating heat from burning metal. Metal fires involving magnesium, sodium, potassium and sodium-potassium alloys can be successfully extinguished with this extinguisher. There is data showing that zirconium, uranium, titanium, and powdered aluminium fires can be controlled and extinguished with this agent.Fact|date=July 2008
Copper
Developed by the U.S. Navy for fighting lithium and lithium alloy fires. The copper compound smothers the fire and provides an excellent heat sink for dissipating heat. Copper powder has been found to be superior to all other known fire extinguishing agents for lithium.
Graphite
Graphite fire extinguishers are also available for use on class D fires. Unlike sodium chloride powder extinguishers, the graphite powder fire extinguishers can be used on very hot burning metal fires such as lithium, but unlike copper powder extinguishers will not stick to and extinguish flowing or verticle lithium fires. Like copper extinguishers, the graphite powder acts as a heat sink as well as smothering the metal fire. [http://fireextinguisherguide.co.uk/types-of-fire-extinguishers/extinguishers-for-metals-2/]
References
Wikimedia Foundation.
2010.
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