Explosive Limits 07
Explosive Limits 07 : (Flammable limits)In the contact of gases and vapors which form flammable mixtures with atmospheric oxygen (oxygen and nitrogen), and pure oxygen there is a minimum concentration of vapor in air or oxygen below which flame propagation does not occur on contact with an ignition source. There is also a maximum proportion of vapor or gas in air above which flame or explosion will not occur. These boundary line mixtures of vapor or gas with air are known as the lower and upper flammable or explosive limits and are usually expressed in terms of percentage by volume. Generally, it may be said that if a mixture is below the lower flammable or explosive limit, it leans toward exploding or burning; above the upper flammable or explosive limit, the mixture is too rich to burn or explode. (For example, in pumping liquids such as hydrocarbon fuels from storage tanks, it is a common safety practice to replace the volume with inert gases, thereby eliminating the possibility of the introduction of an explosive mixture in the oxygen-gas vapor spectrum. An inert gas will neither flame nor explode)
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