Confined Space Welding SWMS

Welding inside confined spaces such as tanks, vessels, silos, and pipe systems concentrates welding fume to levels many times higher than open-workshop welding. Shielding gases displace oxygen, creating an asphyxiation hazard that has caused multiple fatalities in Australian workplaces. The confined space amplifies every welding hazard — fume accumulation is faster, heat stress is more severe, and escape in an emergency is restricted. The WHS Regulation 2025 requires a permit-to-work system for all confined space entry, continuous atmospheric monitoring, and a documented rescue plan before any work commences. This template maps controls to the binding Confined Spaces Code of Practice effective 1 July 2026 under Section 26A.

Legal Requirements

regulation

WHS Regulation 2025 Part 4.3 — Confined Spaces

hrcw category

Work in a confined space

code of practice

Confined Spaces (binding 1 July 2026 under Section 26A)

section 26a binding

Yes — effective 1 July 2026. Non-compliance is admissible as evidence of breach.

Hazards

Hazard	Consequence	Likelihood
Oxygen depletion from shielding gas displacement in enclosed space	Loss of consciousness, asphyxiation, death	Likely
Concentrated welding fume accumulation exceeding WELs rapidly	Acute respiratory distress, chronic lung disease, cancer	Almost Certain
Heat stress from welding in enclosed environment with limited airflow	Heat exhaustion, heat stroke, cardiac arrest	Likely
Electrical shock amplified by conductive vessel walls and perspiration	Electrocution, cardiac arrest	Possible
Fire or explosion from flammable residues in vessels or tanks	Fatal explosion, severe burns	Unlikely
Inability to self-rescue through restricted entry points	Delayed rescue, fatality from exposure or atmosphere	Possible

Controls (Hierarchy of Controls)

Implement a confined space entry permit system with atmospheric testing before and during entry

Provide continuous atmospheric monitoring for oxygen, flammable gases, and toxic gases throughout welding

Install mechanical ventilation with supply air to maintain oxygen levels and extract welding fume

Provide supplied-air breathing apparatus for all welders in confined spaces where LEV is insufficient

Assign a trained standby person at the entry point with rescue equipment and communications

Develop and practise a confined space rescue plan specific to each vessel or space

Use reduced-voltage welding equipment (42V AC maximum open circuit) in conductive confined spaces

Implement rest breaks and hydration protocols to manage heat stress in enclosed welding environments

Recent Prosecutions

Orica Australia Pty Ltd$1,200,000

Workers exposed to hazardous atmospheres without adequate ventilation, monitoring, or health surveillance programs.

2024 — SafeWork NSW v Orica Australia Pty Ltd [2024]

BI Australia Pty Ltd$400,000

Serious worker injuries from inadequate safety controls during fabrication and lifting operations.

2025 — SafeWork NSW v BI Australia Pty Ltd [2025]

What Your SWMS Must Include

✓Confined space entry permit procedure with atmospheric testing requirements

✓Ventilation specifications for each confined space including air supply rate and extraction

✓Continuous atmospheric monitoring plan with alarm set points and action levels

✓Rescue plan with trained rescue team, equipment, and emergency service notification

✓Heat stress management protocol including rest breaks, hydration, and monitoring

Related SWMS

Hot Work →Mig Welding →Stick Welding →

Need a compliant Confined Space Welding SWMS?

Our WHS consultants build space-specific SWMS that address atmospheric hazards, rescue planning, and ventilation design for your confined space welding operations.