Should the valve of the gas cylinder be closed first, or should the fire be extinguished first?
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This post was last edited by Fang Shaocheng on 2019-10-15 at 16:12. At around 11 a.m. on October 13, a gas explosion occurred in a snack shop on Xinyang Road in Ehu Town, Xishan District, Wuxi City. By 5 p.m. of the same day, the rescue operations were completed; as a result of the search and cleanup efforts, 9 people died and 10 were injured. These days, there has been a lot of discussion in WeChat and QQ groups regarding what to do first in case of an accidental fire involving gas cylinders – whether to turn off the valve first or put out the fire first. In a video by a man in white about firefighting, it was said that one should put out the fire first. Someone asked me, and I said that one should turn off the valve first; I was even told that my opinion was incorrect: funk: Although I work in the production of pressure vessels, I really haven’t paid attention to standards for dealing with such disasters. Does anyone know any relevant standards for gas cylinders? Could I borrow them?
Don’t all gas cylinders come equipped with a flame arrestor?
It was a gas explosion; it must have been piped gas. There’s probably some leak somewhere, otherwise the concentration of gas in the air wouldn’t be high enough to cause an explosion.
Are there any standards and documents on this topic that I could borrow?
https://bbs.hcbbs.com/thread-2801752-1-1.html I suggest taking a look; this topic is very popular today.
First cool the gas cylinder with water, then close the valve
There is a possibility of backfire in the pipeline, so it is advisable to extinguish the fire first. If it is a gas cylinder, the valve must be closed first.
The pressure of the gas supply through the pipeline is stable; the valve should be closed first to cut off the gas supply； The pressure in the gas cylinder gradually decreases, and it drops sharply when the valve is closed, which may lead to a backfire explosion; therefore, the fire should be extinguished first before closing the valve. The above is merely personal analysis.
The valve must be closed quickly, but not too fast – leaving a slight opening to maintain positive pressure in the pipeline and prevent backflow. The valve should be fully closed only after the flame has been completely extinguished
When the valve is functional: close the valve on the gas cylinder first, and then reduce the valve opening in the pipeline. When the valve is ineffective: stay as far away as possible from crowded areas and take measures to reduce temperature first.