46 CFR §172.104

1. (a)Type I barge hull not in an integrated tow. If a Type I hull is required and the barge is not a box barge designed for use in an integrated tow, design calculations must show that the barge can survive damage at any location including the intersection of a transverse and a longitudinal bulkhead.
2. (b)Type I barge hull in an integrated tow. If a Type I barge hull is required and the barge is a box barge designed for operation in an integrated tow, design calculations must show that the barge can survive damage—
   1. (1)At any location on the bottom of the tank barge except on a transverse watertight bulkhead; and
   2. (2)At any location on the side of the tank barge including on a transverse watertight bulkhead.
3. (c)Type II barge hull. If a Type II hull is required, design calculations must show that a barge can survive damage at any location except on a transverse watertight bulkhead.