Confined Space [1]

A term used in Occupational Safety and Health Administration [2] (OSHA) safety regulations to define an area which workers may be required to enter but which, because of its size, shape, or location, can present safety hazards. The inside of a gasoline [3] storage tank, for example, is designated as a “confined space.”

Certain containment sumps may also meet the definition of a confined space. Safety regulations may require that workers who enter such a space be equipped with safety lines, breathing devices, etc.