Safety and precautionary measures when entering confined spaces and containers

Danger: Confined spaces may only be entered by trained personnel who are familiar with evacuation and first aid procedures and are equipped with detection, protective and safety equipment. Before entering, the confined space must be ventilated and the atmosphere checked.

The employee must obtain information about the applicable safety regulations from their employer in advance. These safety regulations must be observed before entering confined spaces.

Confined spaces and containers are areas that are largely sealed off from the surrounding environment and where exchange with the ambient air is difficult or impossible. Examples include shafts, sewers, storm water overflow basins, tanks, silos, etc. A confined space is also an area that meets or could potentially meet the following conditions:

  • An atmosphere containing less than 19.5% or more than 23.5% oxygen and/or a certain amount of hydrogen sulphide (i.e. H2S). As an indication, concentrations above 10 ppm of hydrogen sulphide (H₂S) are generally considered hazardous and require protective measures. Refer to the national occupational exposure limits (TWA and STEL) applicable in the country of use.
  • An atmosphere that may be flammable or explosive due to gases, vapours, mists, dust or fibres.
  • Toxic substances that may cause injury, incapacitation, or even death upon contact or inhalation.

Confined spaces are not intended for permanent occupation by people. Access is restricted to certain individuals and the associated hazards are known. These include:

  • Oxygen deficiency
  • Risk of fire and explosion
  • Hazardous and/or biological substances
  • Unexpected flooding in of working materials