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.
Claims3
A ballast water-free ship comprising:
- a bulbous bow and a bulbous stern each 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;
- a bilge keel provided on a bottom of the bottom shell plate in the midship section and disposed in a longitudinal direction of the bottom shell plate;
- and
- three fin stabilizers disposed on the bottom of the bottom shell plate in the midship section and between the bulbous bow and the bulbous stern, the three fin stabilizers being arranged in the longitudinal direction of the bottom shell plate,
- wherein a bottom surface of a cargo containment located in the midship section of the ship has an inclination in a direction of the stern,
- wherein the ship is configured to use clean water including drinking water or extinguishing water as ballast water during cargo loading or unloading,
- 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, and
- wherein a hull bilge radius of the bottom shell plate is formed so as to make an angle between a side and a bottom of the bottom shell plate equal to 90°.
A method of constructing a ballast water-free ship, comprising:
- providing a bulbous bow and a bulbous stern, each of the bulbous bow and the bulbous 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;
- providing a bilge keel on a bottom of the bottom shell plate in the midship section and in a longitudinal direction of the bottom shell plate;
- providing three fin stabilizers on the bottom of the bottom shell plate in the midship section and between the bulbous bow and the bulbous stern and arranging the three fin stabilizers in the longitudinal direction of the bottom shell plate;
- forming a bottom surface of a cargo containment, located in the midship section of the ship, to have an inclination in a direction of the stern;
- and
- forming a hull bilge radius of the bottom shell plate so as to make an angle between a side and a bottom of the bottom shell plate equal to 90°,
- 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.