Flammability Testing for Confined Spaces

There is also a need to test for combustible gases or vapors, which combined with oxygen and an ignition source can create a fire or explosion. Each combustible has its own lower explosive limit (LEL) and upper explosive limit (UEL). It is more likely that an explosion or fire will take place when the conditions are midway between the UEL and LEL. 

Ignition sources can be static electricity, welding, sparking tools, or lighting. A trouble light could easily fall and the bulb could break this condition could ignite flammable vapors or gases. 

Flammable gases can also be poisonous. A safety factor to keep in mind is that the LEL of flammable gases is much higher than the level at which the gas is toxic. 

Procedures must be established that provide for sampling protocol along with the correct use and calibration of instruments. Each employee and supervisor involved in the confined-space program should be trained by a professional in all facets of instrumentation. 

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