Working in Confined Spaces

The Canadian Centre for Occupational Health and Safety defines a confined space as an

“…enclosed or partially enclosed space that: is not primary designed or intended for human occupancy; has a restricted entrance or exit by way of location, size or means; can represent a risk for the health and safety of anyone who enters, due to one of more of the following factors: its design, construction, location or atmosphere; the materials or substances in it; work activities being carried out in it; or the mechanical, process and safety hazards present.”

Confined spaces:

• Can be either above or below ground
• Can be found in almost any workplace
• Can be permanent or temporary spaces

Common confined spaces include, but are not limited to:

• Bunkers
• Storage tanks
• Ship holds
• Tunnels
• Tanks
• Wells
• Crawl spaces
• Silos
• Ductwork

What are the Hazards in a Confined Space?

Hazards in confined spaces include, but are not limited to:

• Reduced oxygen levels
• Risk of fire and/or explosion
• Flooding
• Air contaminants including poisonous gases, fumes, or vapours
• Risk of noxious fumes
• Hot working conditions
• Low visibility

Reducing the Risks

• If possible, avoid entry to confined space
• Identify hazards and complete risk assessments to identify precautions
• Follow proper Confined Space Programs to ensure worker and rescuer (if required) safety
• Ensure workers are trained to recognize hazards
• Ensure all those who are working in confined spaces are qualified to do so
• Have emergency procedures and plans in place prior to commencing work