Ultra Large Container Ship

An ultra large container ship (ULCS) is the largest class of cellular container vessel, conventionally taken as those above roughly 14,500 TEU, and now extending beyond 24,000 TEU. The class is defined by capacity rather than by any regulatory threshold, and its distinguishing features are a beam beyond the reach of the older Panama locks, a very high deck stack, and a hull form with pronounced bow flare and a wide flat transom.

Those features drive a set of engineering problems that smaller container ships do not share to the same degree: large righting-arm variation in longitudinal waves and the parametric rolling exposure that follows, hull girder loads including whipping and springing contributions, lashing forces at the outboard top tiers of the deck stack, and a small number of ports and berths able to take the ship at all.

The full article will cover the size classes and their commercial drivers, the hull form and machinery arrangement, the stability and structural issues specific to the class, the cargo securing problem on deck, the port and terminal constraints, the casualty record on container loss, and the classification rules that apply.