---
kind: "section"
citation: "46 C.F.R. § 173.085"
title: "46"
number: "173.085"
heading: "General subdivision requirements."
url: "https://uscodex.org/cfr/46/173.085"
---

# §173.085. General subdivision requirements.


Each oceanographic vessel must comply with the following:

- (a) Section [171.085(c)(1)](/cfr/46/171.085.md?p=c-1), [(d)](/cfr/46/171.085.md?p=c-d) and [(g)](/cfr/46/171.085.md?p=c-g) of this subchapter.
- (b) [Section 171.105 (a) through (g)](/cfr/46/171.105.md?p=a..g) of this subchapter except that a reduction or elimination of the required inner bottom is allowed if—
  - (1) The inner bottom would interfere with the mission of the vessel; and
  - (2) As a result of other design features, the ability of the vessel to withstand side and bottom damage is not reduced.
- (c) [Section 171.106](/cfr/46/171.106.md) of this subchapter.
- (d) [Section 171.108](/cfr/46/171.108.md) of this subchapter.
- (e) [Section 171.109](/cfr/46/171.109.md) of this subchapter.
- (f) [Section 171.111](/cfr/46/171.111.md) of this subchapter.
- (g) [Section 171.113](/cfr/46/171.113.md) of this subchapter.
- (h) The collision bulkhead must not be penetrated by more than one pipe that carries liquid to or from the forepeak tank. This pipe must have a screwdown valve that is—
  - (1) Operative from above the bulkhead deck; and
  - (2) **Attached to the bulkhead inside the forepeak tank.**
    - (i) Section [171.116 (b)](/cfr/46/171.116.md?p=b), [(c)](/cfr/46/171.116.md?p=c), and [(e)](/cfr/46/171.116.md?p=e) of this subchapter.
- (j) [Section 171.117(c)](/cfr/46/171.117.md?p=c) of this subchapter.
- (k) Each port light in a space located below the freeboard deck, as defined in [§ 42.13-15(i)](/cfr/46/42.13-15.md?p=i) of this chapter, or in a space within an enclosed superstructure must be fitted with a hinged inside dead cover.
- (l) Section [171.118 (b)](/cfr/46/171.118.md?p=b) and [(c)](/cfr/46/171.118.md?p=c) of this subchapter.
- (m) Section [171.122 (a) through (d)](/cfr/46/171.122.md?p=a..d) and [(f)](/cfr/46/171.122.md?p=f) of this subchapter.
- (n) [Section 171.135](/cfr/46/171.135.md) of this subchapter.
- (o) A ventilation duct or forced draft duct may not penetrate a main transverse watertight bulkhead unless—
  - (1) The penetration is watertight;
  - (2) The penetration is located as near the vessel's centerline as possible; and
  - (3) **The bottom of the duct is not more than—**
    - (i) 18 inches (45.7 cm) below the bulkhead deck; and
    - (ii) 4 feet (121.9 cm) above the final waterline after damage determined in [§ 173.080](/cfr/46/173.080.md).

## Notes

### Authority

Authority: 43 U.S.C. 1333; 46 U.S.C. 2113, 3306, 5115; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.3.

### Source

Source: CGD 79-023, 48 FR 51045, Nov. 4, 1983, unless otherwise noted.