Pressure vessel means a vessel that may be used for containing, storing, distributing, transferring, distilling, processing or otherwise handling any gas, vapour or liquid under pressure greater than the atmospheric pressure and includes any pipeline fitting or other equipment attached thereto or used in connection therewith; and
Tank vessel means a ship that is constructed or adapted to carry, or that carries, oil in bulk as cargo or cargo residue, and that:
Vessel means every description of watercraft, other than a seaplane on the water, used or capable of being used as a means of transportation on water.
Vessels shall have the meaning set forth in the recitals.
U.S.-flag vessel means a vessel of the United States or belonging to the United States, including any vessel registered or having national status under the laws of the United States.