Class D fire extinguisher

Extinguish fire with special extinguishant (class D fire extinguisher) powdered graphite, LiCl, KC1, or zirconium silicate may also be used.2 WARNING Possible violent reaction with water. 

Class D fire extinguishers for the specific water reactive chemical being stored should be made available. 

Class D fire extinguishers are commonly found in a chemical laboratory. They are for fires that involve combustible metals, such as magnesium, titanium. 

In fact, graphite powder is a class D fire extinguishing material for combustible metals, including zirconium. For the GT-MHR (and the PBMR for that matter), the oxidation resistance and heat capacity of graphite serves to mitigate, not exacerbate, the radiological consequences of a hypothetical severe accident that allows air into the reactor vessel. 

D Class D fire extinguishing material only metal fires. 

Class D fires Combustible metals such as magnesium, sodium, or potassium are involved. Class D fire extinguishers contain dry chemicals such as sodium chloride containing a thermoplastic binder that forms a solid suffocating crust over the fire. None of the common extinguishers should be used, since they can increase the intensity of the fire by adding an additional chemical reaction. 

Fires involving combustible metals such as magnesium are Class D fires. Special foam compounds are needed to extinguish these fires. 

Class D Fires Fires as a result of sodium, potassium, magnesium, lithium, zirconium and all metal hydrides come under this category. The use of dry soda ash fire extinguishers, sodium chloride, dry sand or graphite is recommended to fight such fires. 

Class D fires involve strong reducing agents such as active metals (magnesium, titanium, zirconium, and alkali metals), metal hydrides, and organome-tallics. Special dry-chemical fire extinguishers are available for these fires (e.g., Ansul Co.). Sand is also useful for small fires of this type. Water should be avoided because it promotes the fire by liberation of hydrogen or hydrocarbons. 

Class D Fires involving certain combustible metals such as magnesium, titanium, zirconium, sodium, potassium, and others that require a heat-absorbing extinguishing medium not reactive with burning... 

Finally, Class D fires involve burning metals. These fires cannot be extinguished with CO2 or water because these compounds may react with some hot metals. For these fires, nonreactive dry powders are used to cover the metal and to keep it separate from oxygen. One kind of powder contains finely ground sodium chloride crystals mixed with a special polymer that allows the crystals to adhere to any surface, even a vertical one. 

FIGURE 14.3. The old symbols, representing Class A, B, C, and D fire extinguishers. Online at http //www.hanford.gov/fire/safety/extingrs.htm. (Dec. 2005). 

Obtain information about die dassificarion of fire extinguishers. Write a brief report eaqplaining what is meant by Class A, Class B, Class C, and Class D fires. 

Class D fires occur in combustible metals, such as magnesium, lithium, or sodium, and require special extinguishers and techniques. 

For Class D fires, involving combustible metals, only special pinpose extinguishers are to be used. Older water, foam and wet chemical extinguishers m simply be one colour - red, blue or oatmeal respectively. 

Class D - fires which involve metals such as aluminium or magnesium. Special dry powder extinguishers are required to extinguish these fires, which may contain powdered graphite or talc. 

Where are the nearest fire extinguishers These wifi almost certainly be ABC extinguishers and will work on almost all fires in labs. But, is there a chance that there could be a Class D fire in this lab How would you extinguish a Class D fire ... 

Are class A and D fire extinguishers no more than 75 ft. apart ... 

Class D. Fires arising from combustible metals, such as magnesium, titanium, zirconium, and sodium are categorized as class D fires. These fires reqiiire specialized techniques to extinguish them. None of the common extinguishers shoidd be iised. Use dry powder extinguishers specific for the metal hazard present on these fires. 

Portable fire extinguishers are classified according to appHcabiHty Class A for soHd combustibles Class B for flammable Hquids Class C for electrical fires that require a nonconducting agent and Class D for combustible metals. Water frequently is used for Class A extinguishers bicarbonates for Class B and Class BC carbon dioxide or Freon for Class C ammonium phosphate for Class ABC and powdered salt, sodium chloride, for Class D. 

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