Usually two years. If there is no expiration mark on it, the pointer on the pressure gauge is in the green area.
Validity period of various types of fire extinguishers
1. Foam fire extinguishers are valid for one year and need to be repaired once a year;?
2. Carbon dioxide fire extinguishers are valid for two years and need to be repaired every year. Maintenance once every two years; 3. Dry powder fire extinguisher, valid for two years, maintenance once every two years; 4. 1211 fire extinguisher, valid for five years, maintenance period depends on storage conditions Depends.
1. The world’s first fire extinguisher was born in London in 1834. The inventor was George William Manby, the commander of Yarmouth Barracks. He invented the portable compressed gas fire extinguisher, which was placed on He specializes in custom-designed trolleys.
2. 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.
3. 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. Floating on burning oil, paint or gasoline, it can effectively isolate oxygen and suffocate the flame.
4. 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.