---
kind: "section"
citation: "46 C.F.R. § 154.176"
title: "46"
number: "154.176"
heading: "Longitudinal contiguous hull structure."
url: "https://uscodex.org/cfr/46/154.176"
---

# §154.176. Longitudinal contiguous hull structure.

- (a) The longitudinal contiguous hull structure of a vessel having cargo containment systems without secondary barriers must meet the standards of the American Bureau of Shipping published in “Rules for Building and Classing Steel Vessels”, 1981.
- (b) The longitudinal contiguous hull structure of a vessel having cargo containment systems with secondary barriers must be designed for a temperature that is:
  - (1) **Colder than the calculated temperature of this hull structure when—**
    - (i) The temperature of the secondary barrier is the design temperature; and
    - (ii) **For any waters in the world except Alaskan waters, the ambient cold condition of—**
      - (A) Five knots air at −18 °C (0 °F); and
      - (B) Still sea water at 0 °C (32 °F); or
    - (iii) **For Alaskan waters the ambient cold condition of—**
      - (A) Five knots air at −29 °C (−20 °F); and
      - (B) Still sea water at −2 °C (28 °F); or
  - (2) Maintained by the heating system under [§ 154.178](/cfr/46/154.178.md), if, without heat, the contiguous hull structure is designed for a temperature that is colder than the calculated temperature of the hull structure assuming the:
    - (i) Temperature of the secondary barrier is the design temperature; and
    - (ii) **Ambient cold conditions of still air at 5 °C (41 °F) and still sea water at 0 °C (32 °F).**

## Notes

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 77-069, 52 FR 31630, Aug. 21, 1987]

### Authority

Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 77-069, 52 FR 31630, Aug. 21, 1987]