How to deal with peeling paint on a fire extinguisher: First check the annual inspection date and pressure gauge. If it is within the green range, the pressure is OK. If the hose has no cracks, is flexible, and has safety tabs, it can be used. Do not expose the exterior of the fire extinguisher to the sun or rain as the paint may peel off.
The way to check whether the fire extinguisher has failed is very simple, which is to check the pressure gauge of the fire extinguisher. You can see that the pressure gauge of the fire extinguisher has three sections: red, green and yellow. If the pointer points to the red area, it means that the pressure in the fire extinguisher is low and cannot spray out. Note that this means that the fire extinguisher has failed. Please refill or replace it immediately.
Basic introduction:
If the pointer points to the green area, it means that the pressure inside the fire extinguisher is normal and it can be used normally. Observation shows that the green area is the narrowest among the three sections of red, green, and yellow.
If the pointer points to the yellow area, it means that the pressure in the fire extinguisher is too high and can be used, but there is a risk of explosion.
Here I would like to remind everyone, do not think that fire extinguishers are very safe. In fact, as long as it is a sealed container, if the air pressure inside is too high, there is a risk of explosion, such as various types of gas cylinders, such as oxygen bottles and propane. Bottles, acetylene bottles, etc. must not be exposed to the sun. Exposure may cause excessive pressure in the cylinder and cause it to explode.
Uses of fire extinguishers
Fire extinguishing equipment is a necessary fire-fighting equipment that is often ignored by people in ordinary times, but comes into play when it is urgently needed. Especially in today's world where there are many high-rise buildings and large amounts of wood, plastic, and fabric are 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. The 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 for the above content? Baidu Encyclopedia-Fire Extinguisher