The validity period of fire extinguishers: All types of foam fire extinguishers are valid for one year and must be repaired every year; all types of carbon dioxide fire extinguishers are valid for two years and must be serviced every two years; all types of dry powder fire extinguishers are valid for two years and must be serviced every two years. Maintenance is once a year; all types of 1211 fire extinguishers are valid for five years, and the maintenance period depends on the storage condition.
The steel stamp mark on the fire extinguisher: MF (L) 8 is expressed in sequence as: fire extinguisher, dry powder fire extinguishing agent, dry powder fire extinguishing agent characteristic code (L represents ammonium phosphate dry powder fire extinguishing agent), and the weight of the refilled dry powder fire extinguishing agent is 8kg
Extended information:
Fire-extinguishing equipment is a necessary item that is often neglected by people but comes into play in urgent need
Especially in high-rise buildings. Today, with a large amount of wood, plastic, and fabric being used indoors for decoration, once there is a fire, without appropriate fire extinguishing equipment, it may cause a disaster.
The fire extinguishing equipment in ancient times 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.
Reference: Baidu Encyclopedia-Fire Extinguisher