WHAT IS EXPLOSION?
Explosion is that caused by a chemical reaction release heat with very rapid gas expansion. The explosion creates a shock wave in the surrounding environment.
Overall explosion occurs in a confined space. When there is a gas or vapor may be flammable liquids in a tank or in a location off the side of a building, with a very small spark ignited. Starting from the point of the flame spreads rapidly in closed volume. The inside temperature of the gas increases and the gas expands. The expanded gas moving forward, it compresses the gas in front of the flame. Gas compression result increases more than temperature. When the flame reaches the jammed section continues to burn very quickly here. When it access to the highest rate of combustion, explosion happens where combustion is partially or completely closed.
Solid particles in the form of dust and gas are explosive with air (oxygen) of specific rates. If an ignition source of these particles is available, they start to burn with explosion. And nearby it ignites dust and air mixture that may cause series explosion.
For the explosion of a powder should be flammable but that does not mean all combustible dust fires. There are a certain concentration limits of explosion. It is called explosion intervals. Bottom and above of these ranges Concentrations would not explosion.
Combustion and detonation properties of the materials depend on their flashpoint. Flash point is important because it creates a liquid mist fire hazard.When the flash point decreases, fire danger increases. Liquids having a flash point lower than ambient temperatures generate vapor of a large amount by the action of heat.
WHAT IS EXPLOSIVE ATMOSPHERE?
An explosive atmosphere is defined as a mixture of dangerous substances with air, under atmospheric conditions, in the form of gases, vapors, mist or dust in which, after ignition has occurred, combustion spreads to the entire unburned mixture. Three elements must come together to create the formation of explosive atmospheres and dangers.
A: Explosive, combustible and flammable gases, vapors or dust
B: Air (oxygen)
C: Energy, a spark or power supply to ignite the explosion
If one of these three elements can be disabled, danger of explosion departs from the atmosphere.