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Confined or Enclosed Spaces and Other Dangerous Atmospheres Definition of Space


Figure 1: Vessel cross section identifying four confined spaces under construction with  downward pointing arrows
Figure 1: Vessel cross section identifying four confined spaces under construction with downward pointing arrows.

Space

An area on a vessel or vessel section or within a shipyard such as, but not limited to: cargo tanks or holds; pump or engine rooms; storage lockers; tanks containing flammable or combustible liquids, gases, or solids; rooms within buildings; crawl spaces; tunnels; or accessways. The atmosphere within a space is the entire area within its bounds. [29 CFR 1915.11(b)]

Note: 29 CFR 1915 Subpart B applies to all Confined/Enclosed Space Entry throughout the Shipyard Employment. General Industry 29 CFR 1910.146 Permit-Required Confined Space Entry does not apply.

Adjacent Space

A space bordering a subject space in all directions, including all points of contact, corners, diagonals, decks, tank tops, and bulkheads. [29 CFR 1915.11(b)]


Confined Space

Any space or void with limited access for entry and exit access, such as a double bottom tank, cofferdam, or other space, which, by its design and confined nature can  readily create or aggravate a hazardous exposure. [29 CFR 1915.4(p)]

Spaces with limited openings for entry and exit with unfavorable natural ventilation — not intended for human occupancy — can readily aggravate a hazardous exposure because of its design (e.g., double bottom tank, wing tank, cofferdam).

Enclosed Space

"Any space, other than a confined space, which is enclosed by bulkheads and overhead. These may include cargo holds, tanks, quarters, and machinery and boiler spaces." [29 CFR 1915.4(q)]


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