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.
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
storage vessel means a pressure vessel as defined in the Regulations for Pressure Vessels made under the Occupational Health and Safety Act;
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.