There are many common combustible gases found in chemical plant. These combustible gases have one similarity. They can be ignited when their concentration in air are within their flammability limits.
What are flammability limits? Flammability limits or commonly known as explosive limits are defined as concentration of combustible gas in mixture with air in which they can be ignited and exploded in the presence of source of ignition.
The lowest concentration of a combustible gas in mixture with air where it still can be ignited is called by Lower Explosive Limit (LEL) or Lower Flammable Limit (LFL). Whereas, the highest concentration of a combustible gas in mixture with air where it still can be ignited is called by Upper Explosive Limit (UEL) or Upper Flammable Limit (UFL). (more…)
Tags: methane lel, UEL data, Upper Explosive Limit, Explosive material, gas purge operation
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A runaway reaction that caused explosion at T2 plant on 19 December 2007 had caused four persons died. Cooling pipe blockage or failed valve probably caused the temperature and pressure inside the batch reactor to become uncontrolled and the relief system could not work to save the system.
