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