A double bottom structure of an LNG carrier

Abstract

The invention relates to a dual-layer bottom structure of a liquefied natural gas ship. The dual-layer bottom structure of the liquefied natural gas ship comprises a hull shell (1) and an inner bottom plate (2). A stern is close to an engine room front end wall (11), and a stem is close to the middle of a middle cargo space. A watertight ship bottom side girder (3) is connected between the hull shell (1) and the inner bottom plate (2). The watertight ship bottom side girder, the hull shell and the inner bottom plate form a water ballast space, a horizontal top plate (4) is fixedly connected in the hull shell, the side edge of the horizontal top plate is fixedly connected with a non-watertight inclined plate (5) inclining downwards, the side, facing the hull shell, of the bottom of the non-watertight inclined plate is fixedly connected with flat steel (6), and the portions, close to the shipboard, of the stern, the stem and regions except the above regions are provided with watertight inclined plates (9). In the structure, arch bending moment increasing amplitude in a hull is greatly reduced compared with the situation that sealing inclined plates are completely eliminated, increase of the weight of an empty ship can be controlled easily, oil consumption is controlled, and energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention relates to a ship structure, in particular to a double bottom structure of a liquefied natural gas ship. Background technique [0002] The existing small and medium-sized liquefied natural gas ship cargo tank layout adopts C-shaped independent cargo tanks. The double bottom structure of the entire cargo tank area is the same as that of bulk carriers. The watertight sloping plate has an angle of 45 degrees with the inner bottom plate and intersects with the outer plate to form a closed double bottom structure. Its advantages are continuous structure and convenient construction. The double bottom is used as a ballast tank, and the ballast capacity is adjusted to be large, which is beneficial to reduce the bending moment of the center arch and the stress of the hull structure. However, when the C-type tank is enlarged, the fore and aft cargo tanks will shrink due to the linear shape. If the double bottom structure still maintains this stru...

AI Technical Summary

Problems solved by technology

However, when the C-type tank is enlarged, the front and rear cargo tanks will shrink due to the linear shape. If the double bottom structure still maintains this structural form, the volume of the C-type tank will be restricted.

If the sloping plate structure is canceled and the double bottom extends directly to the outer plate, although the volume of the C-type tank increases, the ballast water decreases and the bow bending moment in the hull increases greatly, which is not conducive to controlling the weight of the empty ship and increases Reduced fuel consumption, not conducive to energy saving and environmental protection

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