how fire extinguishers put fires out?
hi everyone, this is abit tecnical this one, ive got an assignment at college in hairdressing and need to know about four fire extinguishers, what they put out and how they put them out, and which ones i shouldnt use on certain materials. Ive been on loads of websites im struggling to find HOW they put them out can anyone help?The extinguishers are foam, carbon dioxide, water and dry powder.
Cheers x
Fire is a chemcial process involving fuel, heat, and oxygen. Fire can be extinguished by halting the chemical process directly, or removing one of those three base components.
Most extinguishers work by cooling the fire and/or removing the oxygen from the equation.
Just as there are different types of fire extinguishers, there are different types of fires. In the U.S. fires are broken down in to five classes. Keep in mind that a fire can involve multiple classes simultaneously.
CLASS A – Fires involving Wood, Paper, or Trash
CLASS B – Fires involving flammable liquids and gases
CLASS C – Fires involving energized electrical equipment
CLASS D – Fires involving flammable metals.
CLASS K – Fires involving cooking oils.
About the extinguishers you asked about…
Foam – (Suitable for Class A & B Fires) has a cooling effect and “blankets” the fuel creating a physical barrier separating the oygen fromt he process. Do NOT use this extinguisher on a Class C Fire as the foam agent is water based and will conduct electricity. The water based agent can also be dangerious on cooking oil fires (class K) because of the high water content, it may splatter and injure the user. Foam is not suitable for Class D Fires.
Carbon Dioxide – (Suitable for Class B & C Fires) also has a cooling effect, but it’s main function is tempoarily displacing the Oxygen. CO2 can “knock down” the flames on a class A or K fire, but most likely the fire will re-ignite once the CO2 dissapates. CO2 is not effective on class D fires.
Water – (Suitable for Class A fires only) extinguishing the fire by cooling it. Water is very dangerous to use on all other types of fires because water conducts electricity, and will spatter/spread flammable liquids and cooking oils, and water only aggrivates a class D fire.
Dry Chemical (not to be confused with dry powder is suitable for Class B & C fires, and if it’s the ABC Dry Chemical, Class A as well.) – extinguishes the fire by blanketing the fuel and thus preventing the oxygen from getting to the fire. Dry Chemcial agents are the most common type of portable fire extinguisher as most are chaged with the ABC chemical and are suitable for the three most common classes of fire. ABC should not be used to extinguish a cooking oil fire in a restaurant application as the ABC chemcial is not compatable with the automatic extinguishing systems most resaurants have.
Dry Powder (which I don’t think you meant, is for CLASS D fires) and reacts with the heat to create an crust over the fire and the flammable metals involved will stop burning due to lack of oxygen. Class D fire extinguishers will have no effect on the other 4 classes of fire.
There are a variety of other types of fire extinguishers too, including, but not limited to, Potasium based, organic salt based, halogenated agents…
For more information on all fire extinguishers, the classes of fire, and how extinguishers work, visit the following excellent site…
Fire Extinguisher Training : Carbon Dioxide Fire Extinguisher Uses
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VERY NICE ANSUL SENTRY 5 LB CARBON DIOXIDE FIRE EXTINGUISHER MODEL SY-0572 $100.00 |
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VERY NICE WALTER KIDDE 10 LB CARBON DIOXIDE FIRE EXTINGUISHER MODEL 10 KS $129.99 |
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Amerex 10# CO2 Carbon Dioxide Fire Extinguisher w/ wall $59.99 |
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Amerex 10# CO2 Carbon Dioxide Fire Extinguisher w/ wall $59.99 |
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Ansul Sentry 10# CO2 Carbon Dioxide Fire Extinguisher w $59.99 |
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10 lb. CO2 (CARBON DIOXIDE) FIRE EXTINGUISHER..(ALUMINUM SHELL) *FULL $65.00 |
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NEW KIDDE FENWAL FIRE EXTINGUISHER ALARM SIREN CARBON DIOXIDE $59.00 |
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*(2)METALCRAFT 4210, 2.5 LB. CARBON DIOXIDE FIRE EXTINGUISHERS, EXP. 2Q/2014 $175.00 |
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1944 Kidde – Carbon Dioxide Fire Extinguishers – Ad $9.95 |
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C-O-TWO Carbon Dioxide Fire Extinguisher 1954 print Ad $10.00 |
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*NICE* Badger 20LB CO2 Carbon Dioxide Fire Extinguisher B20V *USED* $200.00 |
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*USED* Badger 10LB CO2 Carbon Dioxide Fire Extinguisher B10V *USED* $100.00 |
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Fire Extinguisher Carbon Dioxide 10 Lb. $238.95 |
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Fire Extinguisher Carbon Dioxide 15 Lb. $296.95 |
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Fire Extinguisher Carbon Dioxide 20 Lb. $352.95 |
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Fire Extinguisher Carbon Dioxide 5 Lb. $176.95 |
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15 LB CO2 Carbon Dioxide Fire Extinguisher – New $225.00 |
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FIRE EXTINGUISHER BADGER MODEL B5V 5LB CARBON DIOXIDE EXCELLENT CONDITION $39.99 |
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1919 German Ad Total Carbon Dioxide Fire Dry Extinguisher Warehouse Fire $44.95 |
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1919 German Ad Total Carbon Dioxide Fire Automatic Dry Extinguisher $36.95 |
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Vintage Walter Kidde Co. Carbon Dioxide Model 15 T-1 Fire Extinguisher w/nozzle $50.00 |
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20 lb. Aluminum Co2 Tank Compressed Gas Air Cylinder for Keg Beer $107.95 The Co2 cylinder is produced from high strength aluminum alloy 6061-T6. These tanks are popular because they are not as heavy as steel tanks and do not rust. Easy carry handle, 8″ diameter, 27.5″ height, 1800 psi, CGA-320 valve. Good for 20-25 kegs…. |
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5 lb Aluminum CO2 Air Tank $59.55 This CO2 cylinder is produced from high strength aluminum alloy. Enjoy the benefits of aluminum tanks – they are lighter than steel tanks and do not rust! Remember, the tank must be used in a fully upright position, so do not tilt it or lay it on its side. Easy to fill; simply check out your local listings under “Gas,” or try local fire extinguisher supply or welding supply companies. In stock and… |
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Kidde KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm $64.97 The Kidde KN-COSM-B Battery-Operated Carbon Monoxide and Smoke Alarm combines two important safety devices into a single unit. This alarm includes a voice warning system that announces “Fire, Carbon Monoxide, Low Battery, or Smart Hush Activation.” The voice alarm eliminates any confusion and clearly warns you and your family of a smoke or carbon monoxide danger, or if your battery is in need of r… |
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Kidde 466181 Pro 10 CD Fire Extinguisher, UL Rated 10-B:C, Carbon Dioxide, Red $195.00 10lb. Pro 10 Cdm Carbondioxide Fire Exting… |
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Kidde 466180 Pro 5 CD Fire Extinguisher , UL Rated 5-B:C, Carbon Dioxide, Red $104.82 Clean agent. CO2 gas dissipates quickly leaving no residue. Agent will not contaminate food, valuable materials or electronics. Seamless cylinder in strong and lightweight…. |
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Kidde 466727 Halotron Fire Extinguisher, 2-1/2-Pound, 2BC $114.35 408-466727 Features: -Leaves no residue.-Acceptable alternative to Halon I2II.-Agent will not cause thermal shock.-Class A capability.-High performance clean agent.-Metal valve, handle and lever.-Diameter: 3 in.-Capacity : 2 1/2 lb.-Extinguishing Material: Halotron.-UL-Rating: 2-B:C.-Fire Type: Class B and C Fires.-Operating Pressure: 100.0 psi.-Operating Time: 9.00 s.-Operating Distance: 6.000 f… |
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The 2007-2012 Outlook for Hand-Portable Carbon Dioxide Fire Extinguishers in Japan $495.00 This study covers the latent demand outlook for hand-portable carbon dioxide fire extinguishers across the prefectures and cities of Japan. Latent demand (in millions of U.S. dollars), or potential industry earnings (P.I.E.) estimates are given across some 1,000 cities in Japan. For each city in question, the percent share the city is of it’s prefecture and of Japan is reported. These comparativ… |
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The 2011 Report on Hand-Portable Carbon Dioxide Fire Extinguishers: World Market Segmentation by City $795.00 This report was created for global strategic planners who cannot be content with traditional methods of segmenting world markets. With the advent of a “borderless world”, cities become a more important criteria in prioritizing markets, as opposed to regions, continents, or countries. This report covers the top 2000 cities in over 200 countries. It does so by reporting the estimated market size (in… |
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The 2007-2012 Outlook for Hand-Portable Carbon Dioxide Fire Extinguishers in Greater China $495.00 This study covers the latent demand outlook for hand-portable carbon dioxide fire extinguishers across the regions of Greater China, including provinces, autonomous regions (Guangxi, Nei Mongol, Ningxia, Xinjiang, Xizang – Tibet), municipalities (Beijing, Chongqing, Shanghai, and Tianjin), special administrative regions (Hong Kong and Macau), and Taiwan (all hereafter referred to as “regions”)… |
