---identifier: "/us/cfr/t46/s174.035"source: "ecfr"legal_status: "authoritative_unofficial"title: "46 CFR § 174.035 - Definitions."title_number: 46title_name: "Shipping"section_number: "174.035"section_name: "Definitions."chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"subchapter_number: "S"subchapter_name: "SUBDIVISION AND STABILITY"part_number: "174"part_name: "SPECIAL RULES PERTAINING TO SPECIFIC VESSEL TYPES"positive_law: falsecurrency: "2026-04-05"last_updated: "2026-04-05"format_version: "1.1.0"generator: "[email protected]"authority: "42 U.S.C. 9118, 9119, 9153; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1. Section 174.180 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905."regulatory_source: "CGD 79-023, 48 FR 51048, Nov. 4, 1983, unless otherwise noted."cfr_part: "174"---
Identifier
/us/cfr/t46/s174.035
Currency
2026-04-05
Positive Law
No
Updated
2026-04-05
Chapter
Coast Guard, Department of Homeland Security
Authority
42 U.S.C. 9118, 9119, 9153; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1. Section 174.180 also issued... 42 U.S.C. 9118, 9119, 9153; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1. Section 174.180 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905.
# 174.035 Definitions.(a) For the purpose of this subpart the following terms have the same definitions as given in subchapter IA of this chapter:(1) *Column stabilized unit.*(2) *Mobile offshore drilling unit.*(3) *Self-elevating unit.*(4) *Surface type unit.*(b) For the purpose of this subpart—(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.