TAIL SHAFT- The extreme section at the aft end of a ship's propeller shaft.

TANK-BARGE- A river barge designed for the carriage of liquid bulk cargoes.

TANK CLEANING- Removal of all traces of a cargo from the tanks of a tanker normally by means of high pressure water jets.

TANKER -A tanker is a bulk carrier designed to transport liquid cargo, most often petroleum products. Oil tankers vary in size from small coastal vessels of 1,500 tons deadweight, through medium-sized ship of 60,000 tons, to the giant VLCCs (very large crude carriers).

Tariff Act of 1930 (P.L. 361)- imposes a 50-percent tariff on maintenance and repair work done on U.S.-flag vessels in foreign shipyards. Also, U.S.-flag vessels must either be built in the United States or have been a U.S.-flag vessel for at least 3 years to be eligible to carry preference cargo.

TBN- To be named/to be nominated

T/C- Time charter

T/C EQUIVALENT- Revenue per day

TERRITORIAL WATERS- That portion of the sea up to a limited instance which is immediately adjacent to the shores of any country and over which the sovereignty and exclusive jurisdiction of that country extend.

T.E.U. -Twenty Foot Equivalent Unit (containers): A measurement of cargo-carrying capacity on a containership, referring to a common container size of 20 ft in length.

TI -Transportation Institute, a non-profit organization devoted to maritime research and education.

TIME BAR- Time after which legal claims will not be entertained

TIME CHARTER- A form of charter party wherein owner lets or leases his vessel and crew to the charterer for a stipulated period of time. The charterer pays for the bunkers and port charges in addition to the charter hire.

TITLE XI- A ship financing guarantee program.

TON MILE- A measurement used in the economics of transportation to designate one ton being moved one mile. This is useful to the shipper because it includes the distance to move a commodity in the calculation.

TONNAGE- Deadweight, gross, net, displacement.

TONNAGE- A quantity of cargo normally expressed as a number of tons.

TOP-OFF- To fill a ship which is already partly loaded with cargo.

TOW -When one or more vessels are being towed; when a tug is towing one or more floating objects; to pull an object in the water by means of a rope.

TOWAGE -Charges for the services of tugs assisting a ship or other vessels in ports or other locations; the act of towing a ship or other objects from one place to another.

TRADING LIMITS- Maritime area usually specified by range of ports in which a vessel may operate

TRAMP SERVICE- Vessels operating without a fixed itinerary or schedule or charter contract.

TRIM -The relationship between a ship's draughts forward and aft.

TUG - A small vessel designed to tow or push large ships or barges. Tugs have powerful diesel engines and are essential to docks and ports to maneuver large ships into their berths. Pusher tugs are also used to push enormous trains of barges on the rivers and inland waterways of the U.S. Oceangoing salvage tugs provide assistance to ships in distress and engage in such work as towing drilling rigs and oil production platforms.