['Confined Spaces']

['Permit-Required Confined Spaces', 'Confined Space Hazards']

03/12/2026

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Confined Spaces - Permit-Required Confined Spaces
FAQ

FAQ

What is oxygen deficiency and how does it develop?

RegSense Confined Spaces Safety & Health Confined Space Hazards Construction Safety General Industry Safety Permit-Required Confined Spaces Best Results FAQ English Focus Area USA

Air normally contains 21 percent oxygen. Oxygen deficiency is created when the oxygen level falls below 19.5 percent at sea level.

Oxygen deficiency can be caused by:

Combustion (fire, welding, and operation of internal combustion engines all consume oxygen),
Formation of rust (consumes oxygen),
Decomposition of organic matter (consumes oxygen and produces flammable methane gas, which can also displace oxygen),
Displacement by a heavy gas that has settled in a low-lying space or by another vapor (an inert gas such as argon, carbon dioxide, or nitrogen) used to purge the space.

['Confined Spaces']

['Permit-Required Confined Spaces', 'Confined Space Hazards']

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