Generally, it is two years. If there is no expiration mark on it, the pointer on the pressure gauge is in the green area.
Validity period of all kinds of fire extinguishers
1. foam extinguisher, valid for one year and maintained once a year; ?
2. Carbon dioxide fire extinguisher, valid for two years and maintained once every two years; ?
3, dry powder fire extinguisher, valid for two years, maintenance once every two years; ?
4, 1211 fire extinguishers, valid for five years, the maintenance period depends on the storage situation.
1. The world's first fire extinguisher was born in London in 1834. The inventor was George William Manby, the commander of Yarmouth Battalion. He invented a portable compressed gas fire extinguisher and put it in his specially designed handcart.
2. By the mid-19th century, French doctor Galileo invented the portable chemical fire extinguisher. Mix sodium bicarbonate and water in a barrel, and put sulfuric acid in a glass bottle in the mouth of the barrel. When in use, the hammer breaks the bottle, so that the chemicals are mixed, carbon dioxide is generated, and the water pressure is discharged out of the barrel.
3. In 195, Professor Laurent of Russia invented a foam fire extinguishing agent in St. Petersburg. Aluminum sulfate was mixed with sodium bicarbonate solution and added with stabilizer. After spraying, foam containing carbon dioxide was generated and floated on burning oil, paint or gasoline, which could effectively isolate oxygen and extinguish the flame.
4. In 199, Davidson of new york obtained a patent to use carbon dioxide to press carbon tetrachloride out of a fire extinguisher, and this liquid will immediately turn into a nonflammable heavier gas to smother the flame. Since then, dry powder fire extinguishers, liquid carbon dioxide fire extinguishers and other small fire extinguishers have appeared.