Hot Works in Confined or Enclosed Spaces
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Hot Works in Confined or Enclosed Spaces
Carrying out welding, cutting, or grinding inside confined or enclosed spaces creates a dangerous combination of toxic fumes, oxygen depletion, and fire risk in an area with limited ventilation and escape routes. The accumulated hazards make this one of the highest-risk activities on any construction site. Both a hot works permit and a confined space entry permit are typically required.
- Obtain both a hot works permit and a confined space entry permit before work begins.
- Provide forced ventilation with fresh air supply at the worker's breathing zone throughout.
- Monitor the atmosphere continuously for oxygen, flammable gases, and toxic fumes.
- Use fume extraction positioned at the weld point to capture contaminants at source.
- Remove or protect all combustible materials inside the space before hot works begin.
- Ensure a trained standby person is positioned at the entry point at all times.
- Limit the duration of hot works sessions and schedule regular breaks in fresh air.
- Keep fire extinguishing equipment inside the space and at the entry point.
- Brief all persons on the combined emergency procedures for fire and confined space rescue.
If the atmosphere alarm sounds or a fire starts inside the space, evacuate immediately. The standby person must not enter without breathing apparatus. Call 999 stating both confined space and fire emergency. Activate the rescue plan.
- Both a hot works permit and a confined space entry permit are required for this work
- Forced ventilation must supply fresh air to the worker's breathing zone at all times
- Monitor the atmosphere continuously for oxygen, flammable gases, and toxic fumes
- A trained standby person must remain at the entry point throughout the operation
- Limit session duration and take regular breaks in fresh air to prevent heat stress
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