KR20160073096A - Hull Structure for Side-by-side Mooring System of Floating Offshore Structure - Google Patents

Abstract

The present invention relates to a hull structure for a side mooring system of a floating offshore structure, capable of: enabling installation of a mooring system, which is to moor a carrier boat to the side of a floating offshore structure, on the side of a hull to facilitate the facility arrangement and space utilization on a deck; and meeting the installation standards of a mooring line even if there is a height difference between the floating offshore structure and the carrier boat during unloading. According to the present invention, the hull structure for a side mooring system of a floating offshore structure includes a ship bottom part (110), a ship side part (120), and a main deck (130). On the ship side part (120) under the main deck (130), a mooring bay (200), which is open towards the outer side of the ship side part (120), is concave towards the center (CL) of a hull (110) from the outer surface of the ship side part (120), and includes a floor part (210), an inner wall part (220), and a ceiling part (230), is formed. On the floor part (210) of the mooring bay (200), a mooring device (300) is installed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hull structure for a lateral mooring system of a floating structure,

The present invention relates to a hull structure for a lateral mooring system of a floating marine structure, and more particularly, to a mooring system for mooring a carrier on the side of a floating marine structure, And it is possible to meet the installation standards of the mooring line even if the height difference between the floating structure and the carrier line due to unloading increases.

So-called "LNG-FPSO (LNG-Floating, Production, Storage, and Offloading)", "FLNG (Floating Liquefaction Natural Gas Production Structure)", Floating marine structures such as FPSO (Floating, Production, Storage, and Offloading) are used to transport natural gas (or crude oil, etc.) from submarine gas fields, (Eg, liquefied) and stored, as well as being capable of unloading stored liquefied gas to a carrier (eg LNG Carrier, Shuttle Tanker, etc.).

Accordingly, the floating floating structure is provided with a storage tank for storing LNG, LPG and condensate in the lower hull part based on the main deck, and a top side ) Is equipped with a processing module for processing and liquefying natural gas mined, a cargo handling facility for loading and unloading, and a living quater for workers to live.

Since these floating marine structures perform operations at sea for a long period of time, unlike vessels that transport cargo while operating the ocean, the liquefied gas stored in the storage tanks can be used as a carrier such as an eluent carrier or shuttle tanker Floating marine structures are moored to approach and then transported using cargo facilities.

An example of side-by-side mooring is shown in FIG. 1 as one of the methods for catching a carrier on a floating floating structure.

1, the lateral mooring system approaches the carrier 20 to the side of the floating marine structure 10 and then hooks the floating marine structure 10 and the carrier 20, A fair leader, and a mooring line (eg rope, chain, wire, etc.) (12).

The moorings including the hooks, fairleaders and mooring lines are installed on the upper surface of the main deck of the hull. Since many facilities such as the above-mentioned various process modules, loading facilities, residence halls and exit hatches are mounted on the main deck, The installation on the main deck up to the unit will reduce the space above the main deck and obstruct the installation of other equipment, thus limiting the optimum layout design for the main deck overhead equipment and complicating the upper part of the main deck.

In addition, in the process of transferring the liquefied gas stored in the floating marine structure to the carrier, the floating marine structure through which the liquefied gas escapes is raised above the water surface, and conversely, the carrier filled with the liquefied gas sinks further below the water surface. However, since the mooring device is installed on the upper part of the main deck, the inclination (angle) of the mooring line connecting the floating marine structure and the cargo ship becomes very urgent and the problem arises that the limit value is exceeded.

Published Patent Publication No. 10-2014-0045132

It is an object of the present invention to provide a mooring bay on the side of a ship and to provide a mooring device thereon, thereby facilitating equipment alignment and space utilization on the upper deck And the hull structure for the lateral mooring system of the floating structure is provided so that the slope angle of the mooring line is gently maintained even when the height difference between the floating marine structure and the carrier is increased at the time of unloading, And the like.

In addition, another object of the present invention is to design the structure of the mooring bay so as to separate the mooring device installation portion and the maintenance and passage road, thereby reducing the width of the mooring bay and preventing the rising of the mooring bay And to ensure the safety of workers.

It is still another object of the present invention to provide a structure that minimizes the influence on the structural stability of the ship according to the installation of the mooring bay.

In order to achieve the above-mentioned object, a hull structure for a lateral mooring system of a floating marine structure according to the present invention has a bottom 110, a side portion 120 and a main deck 130; A side portion 120 of the main deck 130 is opened in a lateral side outward direction of the side portion 120 and is recessed toward the center CL of the hull 10 from the outer surface of the side portion 120 A mooring bay 200 having a bottom portion 210, an inner wall portion 220, and a ceiling portion 230 is formed; And a mooring device 300 is provided at the bottom 210 of the mooring bay 200.

In the hull structure for a lateral mooring system of a floating marine structure according to the present invention, a lateral ballast tank 122 is provided below a bottom portion 210 of the mooring bay 200.

In the hull structure for a lateral mooring system of a floating marine structure according to the present invention, a second mooring deck (240) is further provided with a space above the bottom portion (210) so that the mooring deck Layer structure formed by the bottom 210 and the second mooring deck 240. [

In the hull structure for the lateral mooring system of the floating marine structure according to the present invention, the mooring bay 200 may be configured to be continuously opened in the longitudinal direction of the hull 100.

In the hull structure for the lateral mooring system of the floating marine structure according to the present invention, the mooring bay 200 can be formed by dividing the mooring bay 200 into a plurality of points discontinuously in the longitudinal direction of the hull 100.

According to the hull structure for the lateral mooring system of the floating marine structure according to the present invention, a mooring bay is formed on a side surface of the hull and a mooring device is provided thereon, so that a carrier approaching the side of the hull is constrained The mooring line to be used is not guided from the upper surface of the hull but is guided from the mooring bay on the side of the lower hull. Therefore, the tilting angle of the mooring line becomes gentle and the mooring device can be moved from the main deck to the mooring bay, so that there is more free space on the main deck. I can do it freely.

In addition, since the mooring line is drawn out from the low-mooring bay provided at the side of the hull, even if the height difference between the two ships increases as the loading and unloading progresses, the tilting of the mooring line is not so urgent, And can meet the mooring installation regulations.

Further, according to the second embodiment of the present invention, since the mooring bay mooring deck has a multi-layer structure, one of the passage and mooring devices to be provided at the bottom portion can be moved to the second mooring deck, The width of the second mooring deck can be reduced by the width of the corridor and the passage and maintenance space are isolated from the mooring system,

According to the structure in which the mooring bays are formed continuously in the longitudinal direction of the hull as in the third embodiment of the present invention, it is easy to manufacture members such as a thick plate for forming the mooring bays, and the welding process is simplified.

Further, as in the fourth embodiment of the present invention, when the mooring bay is formed by dividing the mooring bay discontinuously at a plurality of points in the longitudinal direction of the hull, only the section where the mooring line is drawn out is opened to the outside, It is possible to minimize the section that is open to the outside on the side portion and thus to secure the structural safety of the hull of the floating type floating structure more satisfactorily.

1 is a plan view schematically showing a state where a carrier is moored on the side of a floating type floating structure.
2 is a cross-sectional view illustrating a hull structure of a floating structure according to a first embodiment of the present invention.
3 is a plan view showing an example in which a mooring device is installed in a mooring bay according to the present invention.
FIG. 4 is a sectional view of a floating sail structure and a sailing lane according to the present invention showing a lateral mooring state.
5 is a side cross-sectional view showing the structure of a mooring bay according to a second embodiment of the present invention.
6 is a side view showing the structure of a mooring bay according to a third embodiment of the present invention.
7 is a side view showing the structure of a mooring bay according to a fourth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings 2 to 7. 2 to 7, in order to clearly understand only the main components of the invention, the structure of the top side, such as a process module, a cargo handling facility, a residence, etc., is omitted and a hull 10 ).

FIG. 2 is a cross-sectional view illustrating a hull structure of a floating structure according to a first embodiment of the present invention. In FIG. 2, only the starboard side is shown based on the center line (CL) of the hull. The port side may have the same structure, or the port side may not be provided.

2, the hull 10 of the floating marine structure according to the present invention has a structure in which the bottom 110, the side portion 120 and the main deck 130 form a substantially rectangular structure . In addition, a storage tank 140 for storing the produced LNG, LPG, or condensates is built in the hull 10. A lateral ballast tank 122 is provided between the front side portion 120 and the storage tank 140.

A mooring bay 200 is formed on the side portion 120 below the main deck 130. The mooring bay 200 is opened in an outward direction of the front side portion 120 and concave from the outer surface of the side portion 120 toward the center CL of the hull 10, And is partitioned by the inner wall portion 220 and the ceiling portion 230.

The mooring bay 200 is provided with a mooring device 300. That is, the mooring device 300 is not installed on the upper surface of the main deck 130, but is installed in the mooring bay 200 formed on the side of the ship 10.

The mooring line for restraining the carrier approaching the side of the hull 10 is not guided from the upper surface of the hull 10 but is guided from the mooring bay 200 on the side of the hull 10 which is lower in height .

As a result, the inclination angle of the mooring line becomes gentle. Since the mooring device 300 is moved from the main deck 130 to the mooring bay 200, more space is secured on the main deck 130, I can do it freely.

3 is a plan view showing an example in which the mooring device 300 is installed in the mooring bay 200. As shown in Fig.

3, the overall width Wt of the bottom portion 210 of the mooring bay 200 is the distance from the front side portion 120 to the inner wall portion 220. As shown in FIG.

A passage Wa not provided with any device is provided on the inner side of the mooring bay 200, that is, near the inner wall portion 220. The Wa (Wa) is a passage that is left empty for the passage and maintenance of the worker. Therefore, the mooring device 300 is installed in a portion excluding the passage Wa.

As shown in the drawing, the mooring device 300 is provided with a hook 302 on the inner bottom 210 of the mooring bay 200 and a bottom 302 near the entrance of the mooring bay 200 A fair leader 304 is installed on the hook 302 and the hook 302 is hooked on the mooring line 306 and pulled out via the porter 304.

4 shows a state in which the carrier 20 is laterally moored next to the hull 10 of the floating structure according to the present invention.

The carrier 20 approaching the side of the hull 10 of the floating marine structure is restrained by the mooring line 306 drawn out of the mooring bay 200 provided in the bar on the hull 10 side.

The carrier 20 has a storage tank 22 in which the liquefied gas stored in the storage tank 140 of the floating structure is discharged and filled in the carrier 20 so that the hull 10 of the floating structure is lifted, And the carrier 20 is submerged, so that the height difference between the ship 10 and the carrier 20 becomes large.

For example, when the mooring device 302 is disposed on the upper surface of the main deck 130 as in the prior art, since the mooring line 304 is drawn from the upper surface of the main deck 130 and crosses over the carrier 20, The slope of the slope 134 rushes and becomes more urgent as the loading and unloading progresses. Because of this reason, the mooring line 134 is caught by the corner where the main deck 130 and the side portion 120 meet, thereby causing the mooring line 134 to break or the main deck 130 to be damaged.

However, according to the present invention, since the mooring line 306 is drawn out from the low-mooring bay 200 provided at the side of the ship 10, even if the height difference between the two ships increases as the loading and unloading progresses, Since the inclination of the mooring line 306 is not so urgent as can be visually confirmed, the above problem can be solved and the mooring device installation regulations can be satisfied.

5 is a side cross-sectional view showing the structure of a mooring bay 200 according to a second embodiment of the present invention.

Referring to FIG. 5, the mooring bay 200 according to the second embodiment of the present invention has a structure in which the second mooring deck 240 is installed at a predetermined height interval from the bottom 210. That is, the mooring bay 200 has a structure in which a bottom 210 forming the first deck and a second mooring deck 240 are formed in a multi-layered structure. The second mooring deck 240 is supported on the bottom portion 210 by the support structure 242.

A mooring bay consisting of a mooring deck of a plurality of layers is a very desirable and useful form applicable to the case where the mooring bay is provided on the side of the ship like the first embodiment.

If the mooring deck of the mooring bay 200 is formed into a multi-layer structure of the bottom 210 and the second mooring deck 240, the mooring bay can be divided into multiple mooring decks. For example, a mooring device 300 may be installed on the bottom part 210, which is the first mooring deck, and a second mooring deck 240 may be set on the roadway and the maintenance area. Of course, the opposite is also possible.

In the case of the single layer (the first embodiment), it is necessary to provide both the passage and the mooring device installation space in one bottom portion 210, so that the width of the mooring bay 200 can not be increased. The width of the side ballast tanks 122 must be increased correspondingly to meet the conditions such as structural stability and securing of the support structure of the storage tank 140. As a result, the entire width of the floating marine structure is increased, It becomes difficult to secure competitiveness. In addition, since the operator must pass directly to the side of the mooring device 300, it is not good for worker safety.

According to the second embodiment of the present invention, by forming the mooring deck of the mooring bay 200 in a multi-layered structure, one of the passage or the mooring device 300 to be provided in the bottom portion 210 is connected to the second mooring deck 240, the width of the bottom 210 and the second mooring deck 240 can be reduced by the width of the passage. 5, the width of the hull can be reduced by an interval between the inner wall 220 and the outer wall of the storage tank 140. [ In addition, by isolating the passage and the maintenance space from the mooring device 300, it is very advantageous for the safety of the operator.

6 is a side view showing the structure of a mooring bay according to a third embodiment of the present invention.

According to the embodiment shown in FIG. 6, the mooring bay 200 can be formed continuously in the longitudinal direction of the ship 100. In this case, the mooring device 300 is installed at appropriate points.

As shown in FIG. 6, the mooring bay 200 having a continuous shape in the longitudinal direction of the hull 100 is structurally simple, so that members such as a thick plate can be easily manufactured and the welding process can be simplified.

7 is a side view showing a structure of a mooring bay according to a fourth embodiment of the present invention.

According to the embodiment shown in Fig. 7, the mooring bay 200 can be formed discontinuously in the longitudinal direction of the ship 100, that is, at a plurality of points in the longitudinal direction of the ship 10. In this case, the mooring device 300 is divided and installed in a mooring bay 200 formed at a plurality of points.

If a plurality of mooring bays 200 are formed in a discontinuous manner in the longitudinal direction of the hull 100 as shown in FIG. 7 while maintaining a gap therebetween, only a section where the mooring line of the mooring apparatus 300 is drawn And the remaining portion is clogged with the side portion. Therefore, since the section open to the outside on the side portion can be minimized, the structural safety of the hull of the floating structure can be better secured.

The foregoing is a description of certain preferred embodiments of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, .

10: Hull
20: Carrier
110:
120:
122: Side ballast tank
130: Main deck
200: Mooring Bay
210:
220: inner wall portion
230: ceiling
240: 2nd mooring deck
242: Support structure
300: Mooring device
302: Hook
304: Pair leader
306: Mooring line

Claims (5)

Has a bottom part (110), a side part (120) and a main deck (130);
A side portion 120 of the main deck 130 is opened in a lateral side outward direction of the side portion 120 and is recessed toward the center CL of the hull 10 from the outer surface of the side portion 120 A mooring bay 200 having a bottom portion 210, an inner wall portion 220, and a ceiling portion 230 is formed;
Characterized in that a mooring device (300) is provided at the bottom (210) of the mooring bay (200). The method according to claim 1,
Wherein a lateral ballast tank (122) is provided below a bottom portion (210) of the mooring bay (200). The method according to claim 1,
The second mooring deck 240 is further provided with a space above the bottom 210 so that the mooring deck is formed into a multi-layered structure by the bottom 210 forming the first deck and the second mooring deck 240 And the hull structure for the lateral mooring system of the floating floating structure. 4. The method according to any one of claims 1 to 3,
Characterized in that the mooring bay (200) is continuously open in the longitudinal direction of the hull (100), the hull structure for a lateral mooring system of a floating structure. 4. The method according to any one of claims 1 to 3,
Characterized in that the mooring bay (200) is formed by dividing the mooring bay (200) into a plurality of points discontinuously in the longitudinal direction of the ship (100).

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