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Read the text. Tick the statements True/False or Doesn`t Say. Bulk carrier ge...
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Bulk carrier general arrangement and size range are similar to that of tankers. Single-purpose bulk carriers are generally designed as ore carriers, built to carry heavy cargoes stowing at 25 cubic feet per long ton or less, or dry bulk carriers, for grain and similar cargoes stowing at 45 to 50 cubic feet per ton.
Like tankers, the general arrangement of cargo spaces is dictated by the facts that the cargo is in the form of homogeneous particles of more or less uniform size, and can be transferred by blowers, conveyor belts, or grab buckets. Cargo spaces are divided into holds to meet structural and subdivision requirements, to restrain cargo movements and resulting upsetting moments, to permit the carrying of different cargoes simultaneously, and to provide for ballasting. Machinery is invariably aft, and the nonperishable nature of the cargoes leads to speeds in the 12- to 16-knot range, with attendant full hull forms. Relatively small volumes of dense ores and similar cargoes will settle a ship to her summer load line. Holds on ore carriers are therefore quite small, bounded by broad wing tanks and deep double bottoms. The double bottom and longitudinal bulkheads are of heavy construction to carry the heavy ore load. The narrow hold breadth limits transverse weight shifts and the depth of the double bottom is sufficient to keep the center of gravity of the ore high enough to prevent stiff rolling in a seaway. Large volume wing tanks are used for ballast.