الفهرس 
1. IntroductionOnly 14 pages are availabe for public view
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Abstract
The explosion limits of chemical vapors and gases are one of the most important safety
characteristic data for safe handling and storage of hazardous materials. The explosion limits are
usually divided into lower explosion limits (LEL) and upper explosion limits (UEL). The values
of explosion limits are usually depending on many parameters such as temperature, pressure,
standard test method, mixture composition, size and dimensions of the test instrument, and flame
propagation direction. The explosion can take place in gases pipelines or reactors that are used in
different industries. As a result, there are two main types of devices used for determining
explosion limits. The first type is tube method device which depends on visual criterion for
explosion limits such as a tube method used in U.S. Bureau of Mines instrument, DIN51649-1,
and EN1839-T standard test methods. The second type is bomb method device where the criteria
of explosion depend on an increasing in the initial pressure of the explosive mixture by specific
amount such as bomb method which applied in EN1839-B. In the visual criterion experiments
like U.S Bureau of mines, EN1839-T, and DIN51649-1 the explosion limits values are affect by
the test tube internal diameter and height. It is reported in the literature that the standard method
DIN51649 has been developed and changed to EN1839 method. The standard method
DIN51649-1 depends on test tube with internal diameter 60 mm and height 300 mm. The new
standard EN1839-T depends on test tube with internal diameter 80 mm and height 500 mm. In
general, the values of explosion limits are affected by the test tube geometry.