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Cargo ships are categorized partly by cargo or shipping capacity , partly by weight (deadweight tonnage DWT), and partly by dimensions. Maximum dimensions such as length and width ( beam ) limit the canal locks a ship can fit in, water depth ( draft ) is a limitation for canals, shallow straits or harbors and height is a limitation in order to ...
The holds are topped by hatch covers, onto which more containers can be stacked. Many container ships have cargo cranes installed on them, and some have specialized systems for securing containers on board. The hull of a modern cargo ship is a complex arrangement of steel plates and strengthening beams.
A bulk carrier is a ship used to transport bulk cargo items such as iron ore, bauxite, coal, cement, grain and similar cargo. Bulk carriers can be recognized by large box-like hatches on deck, designed to slide outboard or fold fore-and-aft to enable access for loading or discharging cargo.
Roll-on/Roll-off car carrying ship being boarded by articulated haulers at the Port of Baltimore RoRo ports and inland waterways of the United States. Roll-on/roll-off (RORO or ro-ro) ships are cargo ships designed to carry wheeled cargo, such as cars, motorcycles, trucks, semi-trailer trucks, buses, trailers, and railroad cars, that are driven on and off the ship on their own wheels or using ...
Liberty ships were designed to carry 10,000 long tons (10,200 t) of cargo, usually one type per ship, but, during wartime, generally carried loads far exceeding this. [ 9 ] On 27 March 1941, the number of lend-lease ships was increased to 200 by the Defense Aid Supplemental Appropriations Act and increased again in April to 306, of which 117 ...
Container ships are cargo ships that carry their entire load in truck-sized containers, in a technique called containerization. They form a common means of commercial intermodal freight transport . Informally known as "box boats," they carry the majority of the world's dry cargo.
Fishing boats and cargo ships typically have one or more cargo holds. Most larger vessels have an engine room, a galley, and various compartments for work. Tanks are used to store fuel, engine oil, and fresh water. Ballast tanks are equipped to change a ship's trim and modify its stability. Superstructures are found above the main deck.
The knarr was a cargo ship; the hull was wider, deeper and shorter than a longship, and could take more cargo and be operated by smaller crews. It was primarily used to transport trading goods like walrus ivory , wool, timber, wheat, furs and pelts, armour, slaves, honey, and weapons.