---
kind: "range"
citation: "46 C.F.R. §§ 174.075–174.085"
title: "46"
from: "174.075"
to: "174.085"
count: 3
url: "https://uscodex.org/cfr/46/174.075..174.085"
---

# §174.075. Compartments assumed flooded: general.


The individual flooding of each of the compartments described in §§ [174.080](/cfr/46/174.080.md) and [174.085](/cfr/46/174.085.md) must be assumed for the purpose of determining compliance with [§ 174.065 (a)](/cfr/46/174.065.md?p=a). Simultaneous flooding of more than one compartment must be assumed only when indicated in §§ [174.080](/cfr/46/174.080.md) and [174.085](/cfr/46/174.085.md).


# §174.080. Flooding on self-elevating and surface type units.

- (a) On a surface type unit or self-elevating unit, all compartments within 5 feet (1.5 meters) of the hull of the unit between two adjacent main watertight bulkheads, the bottom shell, and the uppermost continuous deck or first superstructure deck where superstructures are fitted must be assumed to be subject to simultaneous flooding.
- (b) On the mat of a self-elevating unit, all compartments of the mat must be assumed to be subject to individual flooding.

# §174.085. Flooding on column stabilized units.

- (a) Watertight compartments that are outboard of, or traversed by, a plane which connects the vertical centerlines of the columns on the periphery of the unit, and within 5 feet (1.5 meters) of an outer surface of a column or footing on the periphery of the unit, must be assumed to be subject to flooding as follows:
  - (1) When a column is subdivided into watertight compartments by horizontal watertight flats, all compartments in the column within 5 feet (1.5 meters) of the unit's waterline before damage causing flooding must be assumed to be subject to simultaneous flooding.
  - (2) When a column is subdivided into watertight compartments by vertical watertight bulkheads, each two adjacent compartments must be assumed subject to simultaneous flooding if the distance between the vertical watertight bulkheads, measured at the column periphery, is equal to or less than one-eighth of the column perimeter at the draft under consideration.
  - (3) When a column is subdivided into watertight compartments by horizontal watertight flats and vertical watertight bulkheads, those compartments that are within the bounds described in [paragraph (a)(2)](#a-2) of this section and within 5 feet (1.5 meters) of the unit's waterline before damage causing flooding must be assumed to be subject to simultaneous flooding.
- (b) Each compartment in a footing must be assumed to be subject to individual flooding when any part of the compartment is within 5 feet (1.5 meters) of the unit's waterline before damage causing flooding.