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A device for reducing liquid sloshing in moon pools of marine engineering structures

A technology for marine engineering and structures, which is applied in the field of devices for reducing liquid sloshing in the moon pool of drilling ships or drilling platforms, and devices for reducing the swaying of structures in marine engineering, can solve problems such as affecting the propulsion efficiency of ships, and improve water quality. Dynamic performance, stopping waves from climbing, reducing the effect of coupling

Active Publication Date: 2018-03-06
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To slow down the sway of structures and the impact of seawater on the deck, the structure of the moon pool will also affect the propulsion efficiency of the ship

Method used

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  • A device for reducing liquid sloshing in moon pools of marine engineering structures
  • A device for reducing liquid sloshing in moon pools of marine engineering structures
  • A device for reducing liquid sloshing in moon pools of marine engineering structures

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 with figure 2 As shown, this embodiment includes a guide cover 2 fixed on the inner wall 1 of the moon pool. The guide cover 2 is a cylindrical structure with a double-layer shell, and includes an outer shell that is fixedly connected with the inner wall 1 of the moon pool. 21. The inner shell 22, a plurality of vertical ribs 23 and a plurality of arc-shaped transverse ribs 24, the outer shell 21 and the inner shell 22 are all in the shape of a horn with a small top and a big bottom matching the shape of the moon pool 1 shape, reduce wave climb, prevent deck 3 from overflowing, and ensure the safety of staff on deck 3. The inner shell 22 is arranged between the outer shell 21 and the inner wall 1 of the moon pool, and a plurality of vertical ribs 23 are uniformly distributed in the radial direction between the outer shell 21, the inner shell 22 and the inner wall 1 of the moon pool, vertically The ribs 23 are made of I-shaped steel, which improves th...

Embodiment 2

[0029] Such as Figure 3 ~ Figure 5 As shown, this embodiment includes multiple layers of wave breaking rings 4 arranged parallel to the axis of the moon pool and having the same inner hole size. The wave breaking ring 4 is a hollow ring structure, including an upper ring plate 41 and a lower ring plate 43 arranged in parallel. and the base ring plate 42 in the middle, and three ring rib plates 44 respectively fixed between the upper ring plate 41, the base ring plate 42 and the lower ring plate 43, the upper ring plate 41, the lower ring plate 43 and the base ring plate 42 The diameter of the rim matches the shape of the moon pool; the outer diameters of the wave-dissipating rings 4 of each layer increase gradually from the deck 3 to the bottom 5 of the ship, and the outer edges of the wave-eliminating rings 4 of each layer are welded and fixed to the inner wall 1 of the moon pool respectively. The inner hole of the upper ring plate 41, the inner hole of the base ring plate a...

Embodiment 3

[0031] Such as Figure 6 ~ Figure 8 As shown, this embodiment includes several rows of arc-shaped wave-dissipating plates 5 arranged at intervals along the inner wall of the moon pool 1 in layers and in opposite helical directions. The inner side of the arc-shaped wave-dissipating plate 5 is welded and fixed on the inner wall 1 of the moon pool. In order to improve the strength of the arc-shaped wave-dissipating plate 5, a plurality of ribs 52 are respectively arranged between the upper and lower sides of the arc-shaped wave-dissipating plate 5 and the inner wall 1 of the moon pool. , the arc-shaped wave-dissipating plate 5 is provided with several rows of wave-dissipating plate lightening holes 51 arranged at intervals in the radial direction, and the hemispherical shell 6 is respectively fixed on both sides of the wave-plate lightening holes 51 symmetrically up and down. The helix angle of the arc-shaped wave-dissipating plate 5 is α=30°, the distance between the arc-shaped ...

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Abstract

A device for reducing liquid sloshing in the moon pool of marine engineering structures. The diversion cover fixed on the inner wall of the moon pool, the diversion cover includes an outer shell fixedly connected with the inner wall of the moon pool, an inner shell, a plurality of vertical ribs and a plurality of arc-shaped transverse ribs, the outer shell Both the body and the inner shell are trumpet-shaped, the inner shell is set between the outer shell and the inner wall of the moon pool, and a plurality of vertical ribs are evenly distributed radially between the outer shell, the inner shell and the inner wall of the moon pool In between, multiple arc-shaped transverse ribs are fixed in layers and intervals between the outer shell, the inner shell and the inner wall of the moon pool, and the outer shell and the inner shell are covered with multiple rows of round ribs from top to bottom. hole. The invention has a simple structure, and the guide cover or multi-layer wave-dissipating rings or series of arc-shaped wave-dissipating plates can effectively prevent waves from climbing up, prevent deck overflow from occurring, reduce the formation of vortices in the moon pool, and improve the hydrodynamic performance of the ship. The coupling effect between seawater and structures is weakened, and the sway of marine engineering structures is weakened.

Description

technical field [0001] The invention relates to a device for reducing sloshing of marine engineering structures, in particular to a device for reducing liquid sloshing in a moon pool of a drilling ship or drilling platform, and belongs to the technical field of ships and marine engineering. Background technique [0002] With the sharp increase of human demand for oil and the continuous development of offshore oil and gas resources, various types of offshore drilling ships and offshore drilling platforms have emerged. The common structural feature of this type of marine engineering structure is that a vertical through hole (moon pool) is set in the middle from the upper deck to the bottom for drilling and oil production. Since the through hole is directly connected to the ocean, the seawater inside the moon pool is greatly affected by the external ocean environment. Under the action of wind, waves and currents, the seawater in the moon pool sloshes severely and moves violent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B35/44
Inventor 黄祥宏谷家扬蒋志勇刘为民吴介
Owner JIANGSU UNIV OF SCI & TECH
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