---
kind: "section"
citation: "46 C.F.R. § 154.466"
title: "46"
number: "154.466"
heading: "Design criteria."
url: "https://uscodex.org/cfr/46/154.466"
---

# §154.466. Design criteria.

- (a) The insulation for a cargo tank without a secondary barrier must be designed for the cargo tank at the design temperature, and for a vessel operating in:
  - (1) **Any waters in the world, except Alaskan waters, for the ambient cold condition of—**
    - (i) Five knots air at −18 °C (0 °F); and
    - (ii) Still sea water at 0 °C (32 °F); or
  - (2) **Alaskan waters for the ambient cold condition of—**
    - (i) Five knots air at −29 °C (20 °F); and
    - (ii) **Still sea water at −2 °C (28 °F).**
- (b) The insulation for a cargo tank with a secondary barrier must be designed for the secondary barrier at the design temperature, and the ambient cold conditions listed under [paragraph (a)(1)](#a-1) or [paragraph (a)(2)](#a-2) of this section.
- (c) The insulation material must be designed for any loads transmitted from adjacent hull structure.
- (d) Insulation for cargo tank and piping must meet [§ 38.05-20](/cfr/46/38.05-20.md) of this chapter.
- (e) **Powder or granulated insulation must—**
  - (1) Not compact from vibrations of the vessel;
  - (2) Maintain the thermal conductivity listed under [§ 154.467](/cfr/46/154.467.md); and
  - (3) Not exert a static pressure greater than the external design pressure of the cargo tank under [§ 154.408](/cfr/46/154.408.md).

## Notes

### 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.