Oxygen, Flammable, Toxic atmosphere hazards in confined space

Oxygen, Flammable, Toxic atmosphere hazards in confined space

1. Oxygen is tested first because both oxygen-deficient and oxygen-enriched atmosphere are extremely hazardous to workers health and safety.(Oxygen levels should be between 19.5-23.5%)
   
2. Flammable or explosive gases & vapors are tested because the threat of fire and explosion is both more immediate and more life-threatening. Flammability limits should be less than 10% of the Lower Flammability Limit (LFL)
   
3. Toxic atmosphere are tested last. Readings should be less than recognized standards of exposure limits.

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