Deadweight ton or “dwt.”

A unit of a vessel’s capacity for cargo, fuel oil, stores and crew, measured in metric tons of 1,000 kilograms. A vessel’s dwt or total deadweight is the total weight necessary to submerge the vessel to its maximum permitted draft.


Additional revenue paid to the shipowner on its Voyage Charters for delays experienced in loading and/or unloading cargo, which are not deemed to be the responsibility of the shipowner, calculated in accordance with specific Charter terms.

Dirty petroleum products

Liquid products refined from crude oil, whose color is greater than 2.5 on the National Petroleum Association scale. Dirty products usually require heating during a voyage, because their viscosity or waxiness makes discharge difficult at ambient temperatures.


Vertical distance between the waterline and the bottom of the vessel’s keel.


The removal of a vessel from the water for inspection and/or repair of those parts of a vessel which are below the water line. During drydockings, which are required to be carried out periodically, certain mandatory classification society inspections are carried out and relevant certifications issued. Drydockings are generally required once every 30 to 60 months.