Basic countermeasures for extinguishing compressed

Basic countermeasures for extinguishing compressed or liquefied gas fires

compressed or liquefied gas is always stored in different containers or transported through pipelines. Among them, the gas pressure stored in smaller cylinders is high, and it is easy to burst when heated or smoked by flame. When the gas leakage meets the fire source and forms stable combustion, the risk of explosion or re explosion is much smaller than that of unburned combustible gas leakage. In case of compressed or liquefied gas fire, the following basic countermeasures should be taken:

① to put out gas fire, it is forbidden to put out the fire blindly. In the absence of accurate measurement of tensile force, tensile strength, elongation after fracture, yield strength and other performance tests of metal materials, it is necessary to maintain stable combustion. Otherwise, a large amount of combustible gas will leak out and mix with the air, and the explosion will occur when encountering the fire source, and the consequences will be unimaginable

② first of all, put out the combustible fire ignited by the fire source in the periphery, cut off the spread path of the fire, control the combustion range, and actively rescue the injured and trapped personnel

③ if there are pressure vessels in the fire or pressure vessels threatened by flame radiant heat, those who can evacuate should be evacuated to a safe area under the cover of water guns as far as possible, and those who cannot evacuate should be deployed with enough water guns for cooling protection. In order to prevent the explosion of the container from injuring people, the cooling personnel should try to use low posture water shooting or use a solid shelter on site for protection. For horizontal storage tanks, the cooling personnel should choose the four side corners of the tank as the water shooting position

④ if the gas transmission pipeline leaks and catches fire, try to find the air source valve. When the valve is in good condition, the fire will be extinguished automatically as long as the inlet and outlet valves of the gas are closed

⑤ when the leakage closing valve of the storage tank or pipeline is invalid, the gas pressure and the size and shape of the leakage port should be judged according to the fire, and the corresponding plugging materials (such as cork, rubber plug, airbag plug, adhesive, elbow tool, etc.) should be prepared

⑥ when the plugging work is ready, you can use water to put out the fire, and also use dry powder, carbon dioxide and halothane to put out the fire, but you still need water to cool the scalded tank or pipe wall. After the fire is extinguished, the leakage should be stopped immediately with plugging materials, and at the same time, the leaked gas with a wingspan of nearly 36 meters can be diluted and dispersed with mist water to extrude pipes, rods and profiles; Body. If it is confirmed that the leakage port is very large and cannot be stopped at all, it is only necessary to cool the fire container and its surrounding containers and combustible materials, and control the fire range until the fuel gas is burnt out and the fire is automatically extinguished

⑦ the on-site commander should pay close attention to all kinds of dangerous signs. In case of explosion signs such as the flame of the container safety valve that fails to recover stable combustion or heated radiation for a long time after the fire is extinguished, the commander must make an accurate judgment in time and issue a withdrawal order in time. After seeing or hearing the predetermined evacuation signal, the on-site personnel shall quickly retreat to a safe area