The 1211 fire extinguisher is a pressure storage fire extinguisher. The 1211 fire extinguisher uses the nitrogen pressure installed in the barrel to eject the 1211 fire extinguishing agent to extinguish the fire. It belongs to the pressure storage type. 1211 is the code name of difluorochlorobromomethane, and its molecular formula is CF2ClBr. It was once the most widely produced and used in my country. A kind of haloalkane fire extinguishing agent, which is packed in liquid cans in cylinders.
1211 fire extinguishing agent is a liquefied gas with a low boiling point. It has high fire extinguishing efficiency, low toxicity, low corrosivity, no deterioration after long-term storage, no traces after fire extinguishing, no pollution to the protected object, and insulation properties. Good to wait for the advantages. However, due to the strong destructive effect of this fire extinguishing agent on the ozone layer, my country stopped producing 1211 fire extinguishing agent in 2005.
The 1211 fire extinguisher is mainly suitable for extinguishing initial fires of flammable and combustible liquids, gases, metals and live equipment; extinguishing initial fires of precision instruments, meters, valuable materials, precious cultural relics, books and files, etc.; Fight first fires on the surface of solid materials in aircraft, ships, vehicles, oil depots, hotels and other places.
The origin of fire extinguishers
In ancient times, fire extinguishing equipment was very simple, nothing more than hooks, axes, shovels, buckets and the like. The first truly dedicated fire extinguisher was invented by Manby, a British captain and Norfolk native, in 1816. It was just one or two barrels filled with more than 1 liter of water and filled with compressed air.
By the mid-19th century, French doctor Gallier invented the portable chemical fire extinguisher. Mix sodium bicarbonate and water in the barrel, and use a glass bottle to hold sulfuric acid in the mouth of the barrel. When used, the striker breaks the bottle, mixing the chemical substances, producing carbon dioxide, and forcing the water out of the barrel.
In 1905, Professor Laurent of Russia invented a foam fire extinguishing agent in St. Petersburg. He mixed aluminum sulfate and sodium bicarbonate solution and added a stabilizer. After spraying, a foam containing carbon dioxide was generated, which floated on the fire. Burning oil, paint or gasoline can effectively isolate oxygen and suffocate the flame.
In 1909, Davidson of New York obtained a patent for using carbon dioxide to press out carbon tetrachloride from a fire extinguisher. This liquid would immediately turn into a non-flammable heavier gas to suffocate the flame. Since then, dry powder fire extinguishers, liquid carbon dioxide fire extinguishers and other small fire extinguishers have appeared.
There are many types of fire extinguishers, which can be divided into: portable type and cart type according to the way they are moved; according to the power source for driving the fire extinguishing agent, they can be divided into: gas storage bottle type, pressure storage type, chemical reaction type ; According to the filled fire extinguishing agent, it can be divided into: foam, dry powder, haloalkane, carbon dioxide, water, etc.