---
kind: "section"
citation: "46 C.F.R. § 172.133"
title: "46"
number: "172.133"
heading: "Character of damage."
url: "https://uscodex.org/cfr/46/172.133"
---

# §172.133. Character of damage.

- (a) If a type I hull is required, design calculations must show that the vessel can survive damage at any location.
- (b) Except as provided in [§ 153.7](/cfr/46/153.7.md) of this chapter, if a type II hull is required, design calculations must show that a vessel—
  - (1) Longer than 492 feet (150 meters) in length can survive damage at any location; and
  - (2) Except as specified in [paragraph (d)](#d) of this section, 492 feet (150 meters) or less in length can survive damage at any location.
- (c) If a Type III hull is required, design calculations must show that a vessel—
  - (1) Except as specified in [paragraph (d)](#d) of this section, 410 feet (125 meters) in length or longer can survive damage at any location; and
  - (2) Less than 410 feet (125 meters) in length can survive damage at any location except to an aft machinery space.
- (d) A vessel described in paragraph [(b)(2)](#b-2) or [(c)(1)](#c-1) of this section need not be designed to survive damage to a main transverse watertight bulkhead bounding an aft machinery space. Except as provided in [§ 153.7](/cfr/46/153.7.md) of this chapter, the machinery space must be calculated as a single floodable compartment.

## Notes

### Amendments

[CGD 79-023, 48 FR 51040, Nov. 4, 1983, as amended by CGD 81-101, 52 FR 7799, Mar. 12, 1987]

### Authority

Authority: 46 U.S.C. 3306, 3703, 5115; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation 00170.1, Revision No. 01.2.

### Source

Source: CGD 79-023, 48 FR 51040, Nov. 4, 1983, unless otherwise noted.

### Amendments

[CGD 79-023, 48 FR 51040, Nov. 4, 1983, as amended by CGD 81-101, 52 FR 7799, Mar. 12, 1987]