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: UEL data, purged gas, plant explosion, Nitrogen substitution, flammable limit
I took this picture when I was walking through the plant site for safety patrol. The picture shows lubrication oil dropped on compressor’s power cable. Then, what’s wrong with this picture?
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