Hazardous Atmospheres

Corrosive Atmospheres

Hydrochloric acid and ammonia are types of chemicals that can build up a corrosive atmosphere. Corrosive means that the substance is harmful to the skin and eyes, and it reacts to metal. If a corrosive atmosphere or substance is detected during an atmospheric check do not allow entrants to enter the confined space until all levels are clear or the corrosive substance is removed.

Toxic Atmospheres

Toxic atmospheres can be introduced into a confined space when a toxic chemical or gas is stored in a tank or holder producing carbon monoxide or hydrogen sulfide. Check for toxic atmospheres within the confined space before allowing an entrant to enter.

Flammable Atmospheres

Sources of ignition can create flammable atmospheres. Flames are the most common form of ignition, while electrical discharge can raise the temperature to the ignition point. Beware of heat and radiation within confined spaces.

Check for any of these hazardous atmospheres before entering a confined space. If found try and eliminate the risk or the need to enter a confined space. If that is not possible, minimize the risk of entering by ensuring that your entrant wear wears appropriate PPE when entering the space.

To learn more about Confined Spaces Competent Person/Supervisor visit our Confined Spaces Competent Person/Supervisor Online Training web page.