Tank vessel means a vessel that is constructed or adapted to carry, or that carries, oil or hazardous material in bulk as cargo or cargo residue, and that -
(1) Is a vessel of the United States;
(2) Operates on the navigable waters of the United States; or
(3) Transfers oil or hazardous material in a port or place subject to the jurisdiction of the United States.
46 CFR § 10.107
With respect to part 16 of this subchapter only, if the definitions in paragraph (b) of this section differ from those set forth in 16.105, the definition set forth in 16.105 applies.