Ballast water-free vessel using difference in depth of bottom shell plate between bow/stern and midship section and construction method thereof
AssigneeKorea Institute of Ocean Science & Technology
InventorsHee Jin KANG, Jin CHOI, Hae Seong AHN, Kwang Soo KIM, Geun Tae YIM, Myoung Soo KIM
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Abstract
A ballast water-free ship using a difference in the depth of the bottom shell plate between the bow/stern and the midship section and a construction method thereof. A stepped portion is formed between either the bow or the stern and the midship section, such that the depth of the bottom shell plate of either the bow or the stern differs from the depth of the bottom shell plate of the cargo containment in the midship section, so that cargo can be loaded and unloaded without ballast water operation.
Claims12
A ballast water-free ship comprising:
- a bow and a stern protruding downward to form a stepped portion in a bottom shell plate of a ship, between either the bow or the stern and a midship section;
- and
- a bilge keel provided on a bottom of the bottom shell plate in the midship section to be located in a longitudinal direction of the bottom shell plate,
- wherein the stepped portion formed on the bottom shell plate, between either the bow or the stern and the midship section, causes a difference in height between a draft of the midship section and a draft of either the bow or the stern, such that posture control of the ship in a body of water is enabled in a ballast water-free condition, using a difference in depth of the bottom shell plate between either the bow or the stern and the midship section.
A method of constructing a ballast water-free ship, comprising:
- providing a bow and a stern to protrude downward to form a stepped portion in a bottom shell plate of a ship, between either the bow or the stern and a midship section;
- and
- providing a bilge keel on a bottom of the bottom shell plate in the midship section to be located in a longitudinal direction of the bottom shell plate,
- wherein the stepped portion formed on the bottom shell plate, between either the bow or the stern and the midship section, causes a difference in height between a draft of the midship section and a draft of either the bow or the stern, such that posture control of the ship in a body of water is enabled in a ballast water-free condition, using a difference in depth of the bottom shell plate between either the bow or the stern and the midship section.
Dependencies are inferred from the claim text.