But there is both an upper explosive limit and a lower explosive limit with most combustible vapors.
2.
At a high level of the gas the Upper Explosive Limit is reached, and above that the mixture is too rich to explode.
3.
It can also occur during hot starting; high temperatures may cause fuel in the carburetor float chamber to evaporate into the inlet manifold, causing the air / fuel mixture to exceed the upper explosive limit.
4.
In this connection number of tsts are to be carried out for finding the parameters like Flash point, composition by using chromotography, auto ignition temperature, purity of sulphur, Lower and upper explosive limits of products etc.
5.
Auto ignition point of blast furnace gas is approximate and it has LEL ( Lower Explosive Limit ) of 27 % & UEL ( Upper Explosive Limit ) of 75 % in an air-gas mixture at normal temperature and pressure.
6.
However, the Environmental Protection Agency's ( EPA ) " Newtown Creek / Greenpoint Oil Spill Study Brooklyn, New York " states that vapor concentrations in " some commercial establishments " were found " above the Upper Explosive Limit " ( page 7 ).
7.
For the common industrial hydrocarbon gases and solvents, the minimum ignition energy required for ignition of vapor-air mixture is lowest for the vapor concentration roughly in the middle between the lower explosive limit and the upper explosive limit, and rapidly increases as the concentration deviates from this optimum to either side.
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