The D-9 class or D9 class was a class of twelve container ships owned by the US shipping company Sea-Land Corporation . Sea-Land commissioned the ships in 1980. When they were built, the container ships of the D-9 class were the first motor ships planned and built as such by the Sea-Land shipping company.
The development of the ship type was commissioned by the shipping company Sea-Land in the spring of 1978 from Mitsubishi, Tamano. After Sea-Land invited shipyards in twelve different states to submit offers to build the ships in August 1978, the building contract for the ships was also awarded to Mitsubishi as the main contractor. Since Mitsubishi was unable to deliver all twelve ships within a year, the individual units were built not only at Mitsubishi's shipyards in Kobe and Nagasaki but also at Mitsui Engineering & Shipbuilding in Ichihara and the South Korean shipyard Hyundai Heavy Industries in Ulsan. Mitsubishi acted as the monitoring shipyard for the latter.
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Fire on the Sea-Land Mariner , 1998
The ship's superstructures are arranged about four fifths of the length aft over the engine room. The ships have seven holds , six of which are in front of the deckhouse and one behind. The holds are locked by pontoon hatch covers . Before the ships were built, Sea-Land switched from 35-foot containers, the early standard Sea-Land dimensions, to the operation of 20 and 40-foot containers. During construction, the ships of the D9 class were designed for the transport of 1678 TEUs, whereby a number of cell guides could be adapted to flexibly accommodate various container dimensions , especially 35-foot containers. After a recalculation, the new buildings later held 1780 TEU. As early as 1985, all twelve Mitsubishi ships were lengthened by a 30-meter middle section, after which they were able to transport 2,471 TEU. After a further recalculation, this value was also increased again to 2816 TEU storage spaces, with the maximum number of 14-ton containers being 2252. All ships in the series have connections for 261 refrigerated containers. Lashing bridges with cell guides were attached to the deck for the five bays in front of the deckhouse. The D-9 class ships do not have their own loading gear .
The 9RND90M nine-cylinder two-stroke diesel main engine built by Mitsubishi at the Kobe plant under license from the manufacturer Sulzer acts directly on the fixed-pitch propeller. The on-board energy is provided by four auxiliary diesels and one emergency diesel.
