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The first thing you should do is to determine whether the work can be done without anyone having to enter a confined space.

Example:
  • Clean a tank using high-pressure hoses inserted through a top access hole or a side hatch.
  • Inspect the inside of a confined space by using a video camera or mirror attached to a probe.
  • Relocate a reading device from inside the space to outside.
  • Keep material in a hopper or silo flowing using turbulence valves or vibration to prevent packing, crusting and bridging.

If it’s not possible to do the work from outside the space, consider ways of reducing the risk.

Example:

  • Scrape the surface of a tank instead of using chemicals.
  • Use a non-flammable solvent in place of a flammable solvent.
  • Use pastes instead of powders.
  • Use purging or ventilation to prevent the build-up of atmospheric contaminants.
  • Carry out any maintenance or repairs of plant in a workshop rather than in the space.
  • Use respiratory protective equipment.

If there is any risk that the air in a confined space may be unsafe, you should carry out atmospheric testing, as many toxic gases and vapours (such as carbon monoxide) can’t be seen or smelt.

In certain circumstances, plant or services may need to be isolated to prevent:

  • the introduction of contaminants through piping, ducts, vents and drains
  • hot or cold conditions that may increase the risk to people working in the space
  • the activation or energising of machinery in the space
  • the use of electrical equipment

 

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