Hazardous properties of compressed and liquefied gases：

(1) More than half of the compressed and liquefied gases are inflammable and explosive. Once ignited, the flammable gas can be burned out in a very short time. The explosion is very dangerous and it is very difficult to put out the fire.

(2) Strong flow diffusivity. Compressed and liquefied gases can spontaneously fill any container and diffuse easily. For example, most inflammable gases are heavier than air, which can spread quite far and drift on the surface, ditches, tunnels, dead corners of factories, etc., for a long time to gather and do not disperse. In case of fire, there will be combustion or explosion, which is easy to cause fire expansion.

(3) Heated expansion, pressure rise. Both compressed and liquefied gases stored in cylinders usually have high pressure. Excessive heat will lead to a large increase in air pressure, once the pressure exceeds the pressure strength of the container, it will cause the container to break and physical explosion, resulting in fire or poisoning accidents.

Caricature diagram of gas liquefaction

(4) Easy to generate or aggregate static electricity. When the compressed gas and liquefied gas are ejected from the nozzle or the broken part at high speed, static electricity will be generated due to the strong friction.

(5) It is corrosive and toxic. Except oxygen and compressed air, compressed gas and liquefied gas are poisonous and corrosive to some extent.

(6) Suffocation. Both compressed gas and liquefied gas have certain asphyxiation, once leakage occurs, if no corresponding ventilation measures are taken, people can die of asphyxiation.

(7) It is oxidizing. There are two kinds of hazards of compressed and liquefied gases: one is combustion-supporting gases, such as oxygen; Two is a toxic gas, itself is not flammable, but strong oxidation, and combustible gas mix can occur after combustion or explosion, such as chlorine and acetylene.