U.S. Code of Federal Regulations

Regulations most recently checked for updates: Apr 07, 2020

§ 172.135 - Extent of damage.

For the purpose of § 172.133 -

(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 172.135 except that, if the most disabling penetrations would be less than the penetrations given in Table 172.135, the smaller penetration must be assumed.

Table 172.135 - Extent of Damage

Collision Penetration
Longitudinal extent0.495L 2/3 or 47.6 feet (( 1/3)L 2/3 or 14.5m) whichever is shorter.
Transverse extent 1B/5 or 37.74 feet (11.5m) 2 whichever is shorter.
Vertical extentFrom the baseline upward without limit.
Grounding Penetration At the Forward End But Excluding Any Damage Aft of a Point 0.3L Aft of the Forward Perpendicular
Longitudinal extentL/10.
Transverse extentB/6 or 32.81 feet (10m) whichever is shorter.
Vertical extent from the baseline upwardB/15 or 19.7 feet (6m) whichever is shorter.
Grounding Penetration At Any Other Longitudinal Position
Longitudinal extentL/10 or 16.41 feet (5m) whichever is shorter.
Transverse extent16.41 feet (5m).
Vertical extent from the baseline upwardB/15 or 19.7 feet (6m) 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.