Gas testing in confined space
Always test for atmospheric hazards in the following order:
Oxygen is tested first because both oxygen-deficient and oxygen-enriched atmosphere are extremely hazardous to worker health and safety. (Oxygen levels should be between 19.5%-23.5%)
Flammable or explosive gases & vapors are tested because the threat of fire and explosion is both more immediate and more life-threatening. Flammability limit should be less than 10% of the lower
Flammability Limit ( LFL)Toxic atmosphere are tested last. Readings should be less than recognized standards of exposure limits.
Credit : OSHA
Oxygen is tested first because both oxygen-deficient and oxygen-enriched atmosphere are extremely hazardous to worker health and safety. (Oxygen levels should be between 19.5%-23.5%)
Flammable or explosive gases & vapors are tested because the threat of fire and explosion is both more immediate and more life-threatening. Flammability limit should be less than 10% of the lower
Flammability Limit ( LFL)Toxic atmosphere are tested last. Readings should be less than recognized standards of exposure limits.
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