[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR172.175]

[Page 154]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 172--SPECIAL RULES PERTAINING TO BULK CARGOES--Table of Contents
 
   Subpart G--Special Rules Pertaining to a Ship That Carries a Bulk 
       Liquefied Gas Regulated Under Subchapter O of This Chapter
 
Sec. 172.175  Character of damage.

    (a) If a type IG hull is required, design calculations must show 
that the vessel can survive damage at any location.
    (b) If a type IIG 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) 492 feet (150 meters) or less in length can survive damage at 
any location except the transverse bulkheads bounding an aft machinery 
space. The machinery space is calculated as a single floodable 
compartment.
    (c) If a vessel has independent tanks type C with a MARVS of 100 psi 
(689 kPa) gauge or greater, is 492 feet (150 meters) or less in length, 
and Table 4 of part 154 of this chapter allows a type IIPG hull, design 
calculations must show that the vessel can survive damage at any 
location, except as prescribed in paragraph (e) of this section.
    (d) If a type IIIG hull is required, except as specified in 
paragraph (e) of this section, design calculations must show that a 
vessel--
    (1) 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 in the main machinery space.
    (e) The calculations in paragraphs (c) and (d) of this section need 
not assume damage to a transverse bulkhead unless it is spaced closer 
than the longitudinal extent of collision penetration specified in Table 
172.180 from another transverse bulkhead.
    (f) If a main transverse watertight bulkhead or transverse 
watertight bulkhead bounding a side tank or double bottom tank has a 
step or a recess that is longer than 10 feet (3.05 meters) located 
within the extent of penetration of assumed damage, the vessel must be 
shown by design calculations to survive damage to this bulkhead. The 
step formed by the after peak bulkhead and after peak tank top is not a 
step for the purpose of this regulation.