This term refers to a space that meets the criteria of a confined space and contains or has the potential to contain hazards capable of causing death or serious physical harm. Such hazards can include atmospheric dangers (oxygen deficiency or enrichment, flammable gases, toxic air contaminants), engulfment risks from materials like grains or liquids, internal configurations that could trap or asphyxiate entrants, and other safety or health hazards. An example would be a storage tank that has contained a flammable liquid, requiring specific procedures and equipment to ensure safe entry for inspection or maintenance.
Understanding this specific classification of confined spaces is critical for ensuring worker safety. Recognizing the characteristics and potential dangers allows employers to implement appropriate safety measures. These measures include, but are not limited to, atmospheric monitoring, ventilation, personal protective equipment, and the development of a comprehensive entry program. A rigorous and well-enforced program minimizes risks, reducing the likelihood of accidents, injuries, and fatalities associated with entry into these potentially hazardous areas. Its implementation is deeply rooted in historical incidents and subsequent regulatory actions designed to prevent future tragedies.
