U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
For the purpose of § 172.170—
(a) Design calculations must include both side and bottom damage, applied separately; and
(b) Damage must consist of the penetrations having the dimensions given in Table 172.180 except that, if the most disabling penetrations would be less than the penetrations given in Table 172.180, the smaller penetration must be assumed.
Table 172.180—Extent of Damage
| Longitudinal extent | 0.495L
|
| Transverse extent 1 | B/5 or 37.74 feet (11.5m) 2 whichever is shorter. |
| Vertical extent | From the baseline upward without limit. |
| Longitudinal extent | 0.495L
|
| Transverse extent | B/6 or 32.81 feet (10m) whichever is shorter. |
| Vertical extent from the molded line of the shell at the centerline | B/15 or 6.6 feet (2m) whichever is shorter. |
| Longitudinal extent | L/10 or 16.41 feet (5m) whichever is shorter. |
| Transverse extent | B/6 or 16.41 feet (5m) whichever is shorter. |
| Vertical extent from the molded line of the shell at the centerline | B/15 or 6.6 feet (2m) whichever is shorter. |
1 Damage applied inboard from the vessel's side at right angles to the centerline at the level of the summer load line assigned under Subchapter E of this chapter.
2 B is measured amidships.
