Code of Federal Regulations Title 46. Shipping § 46.174.035 Definitions

(1) Column stabilized unit.

(2) Mobile offshore drilling unit.

(3) Self-elevating unit.

(4) Surface type unit.

(1) Downflooding means the entry of seawater through any opening that cannot be rapidly closed watertight, into the hull, superstructure, or columns of an undamaged unit due to heel, trim, or submergence of the unit.

(2) Downflooding angle means the static angle from the intersection of the unit's centerline and waterline in calm water to the first opening through which downflooding can occur when subjected to a wind heeling moment (Hm) calculated in accordance with § 174.055.

(3) Normal operating condition means a condition of a unit when loaded or arranged for drilling, field transit, or ocean transit.

(4) Severe storm condition means a condition of a unit when loaded or arranged to withstand the passage of a severe storm.