What is a flash explosion

A flash explosion occurs when flammable gases accumulate to a certain concentration in a space with poor air circulation; upon encountering an open flame or electric spark, they immediately ignite and expand, resulting in an explosion. Under normal circumstances, there is only one explosion; if the flammable gas can be replenished in time, further explosions will occur. Dangers of flash explosions: 1. Liquefied gas is volatile, and its explosion can affect a wide area. At normal temperature and pressure, liquefied gas evaporates very easily; when it comes into contact with air, its volume can increase by 250 to 300 times. Thus, when liquefied gas leaks, it turns into a large amount of gas that remains in the air, creating a large hazardous area. II. LPG fires occur suddenly and pose a great threat. When liquefied gas disperses into the air and comes into contact with fire, it may explode first and then burn, or burn first and then explode; in either case, these reactions occur instantly, catching people off guard and posing a severe threat to those on site as well as rescue workers. How to deal with flash explosions 1. Eliminate ignition sources ； 2. Prohibit the use of electricity for production and daily living ； .3. Turn off all communication devices of all personnel on site ； 4. Evacuate personnel to a safe area ； 5. Quickly dilute and disperse liquefied petroleum gas using a water gun. Experts advise: Do not forget to turn off the liquefied gas cylinder before going out, and upon returning home check for any unusual odors. In the event of a liquefied gas leak, stay calm, immediately shut off the main gas valve, and open doors and windows to allow ventilation and remove any flammable gases from the room. Under no circumstances should you turn on any electrical switches, as the electric sparks from these switches could trigger a gas explosion. If the problem with the liquefied gas cannot be resolved, leave the house immediately and call the gas supply company’s emergency hotline or report it to the police at 110, so that professionals can come and fix it. Experts analyze that in daily use, most gas stoves in households are built-in types. The cabinets of such stoves are highly airtight, which easily leads to unburned gas remaining inside the stove cabinet after each shutdown. Since liquefied gas or air-gas mixtures are heavier than air, this unburned gas is not discharged in time. When it accumulates to a certain amount, and if the mixture ratio of gas to air reaches the explosive range of 2%–8%, an explosion can occur instantly upon contact with an open flame. This results in a high-temperature fireball that expands 250 times its original size. In addition to causing burns on the skin and damage to household appliances, it is even more dangerous as it can lead to inhalation-related respiratory burns.

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