KR101523910B1 - Vessel having independent type container for lng and builing method thereof - Google Patents

Abstract

The present invention relates to a ship having a stand-alone storage tank for liquefied natural gas and a drying method thereof.
According to an aspect of the present invention, there is provided a method of drying a ship having a free-standing storage tank for liquefied natural gas, comprising: separately drying the ship and the independent storage tank; Installing a temporary rail on the hull and installing a temporary jig in the independent storage tank to move along the temporary rail; Transferring the independent storage tank to the hull, and placing the temporary jig on the temporary rail; Moving the stand-alone storage tank to a predetermined position along the temporary rail; And a step of fixing the independent type storage tank to the fixed position. The present invention also provides a method for drying a ship having a storage tank for liquefied natural gas.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a ship having a self-contained storage tank for liquefied natural gas,

The present invention relates to a ship having a stand-alone storage tank for liquefied natural gas and a drying method thereof.

Liquefied natural gas (hereinafter referred to as "LNG") can be obtained by cooling natural gas (hereinafter referred to as "NG") containing methane as a main component to about -162 ° C. and liquefying It is a colorless transparent liquid and has a volume of about 1/600 as compared with NG. Therefore, it is very efficient to transport liquefied LNG when NG is transported. For example, an LNG carrier that can transport LNG by sea is used.

The storage tank for storing LNG can be divided into a membrane type storage tank and an independent type storage tank depending on the type. The membrane type storage tank is formed integrally with the hull and the storage tank, and the independent storage tank is formed separately from the hull.

Since the independent storage tanks are formed independently of the hull, i.e., they are formed independently, a process for installing storage tanks in the hull is required to dry the ships with the independent storage tanks.

However, since the independent type storage tank is very heavy (about 1500 to 2000 tons), the independent storage tank is manufactured separately from the hull and is lifted up to be installed on the hull by using a gantry crane Crane) due to the capacity limit problem.

Because of such a problem, currently, a method of separately manufacturing a stand-alone storage tank up and down and then mounting the lower part first on the hull using a gantry crane and then mounting the upper part again is used.

For example, if you want to install a stand-alone storage tank with a weight of 1600 tons on a hull that is dry-docked with a gantry crane with a 900 tonne load-bearing capacity, And the upper part having a weight of 750 tons. Then, the lower part is first mounted on the hull using a gantry crane, and the upper part is mounted on the hull using a gantry crane, A separate storage tank may be installed.

However, the above-described conventional techniques have the following problems.

First, after the independent storage tank is divided and manufactured, it must be divided and mounted and then re-welded, so that the process schedule becomes longer.

In addition, since the welding operation must be performed in a hull inside the dock, there is a problem that the productivity is adversely affected due to an increase in labor cost and an increase in the process schedule.

Further, the storage tank must be subjected to a performance test after it is manufactured. Since the storage tank is completed in the dock, there is a difficulty in regard to heat insulation and equipment installation for performance testing.

Patent Document: Korean Patent Laid-Open No. 10-2012-0139286 (Dec. 27, 2012)

Embodiments of the present invention are to provide a ship having a stand-alone storage tank for liquefied natural gas capable of reducing the drying process schedule and a drying method thereof.

The present invention also provides a ship having a stand-alone type storage tank for liquefied natural gas with improved productivity and a method of drying the vessel.

It is another object of the present invention to provide a ship having a stand-alone storage tank for liquefied natural gas and a method of drying thereof, which can facilitate performance testing of the storage tank to be mounted.

According to one aspect of the present invention, there is provided a method of drying a ship having a free-standing storage tank for liquefied natural gas, comprising: separately drying the ship and the independent storage tank; Installing a temporary rail on the hull and installing a temporary jig in the independent storage tank to move along the temporary rail; Transferring the independent storage tank to the hull, and placing the temporary jig on the temporary rail; Moving the stand-alone storage tank to a predetermined position along the temporary rail; And a step of fixing the independent type storage tank to the fixed position. The present invention also provides a method for drying a ship having a storage tank for liquefied natural gas.

In addition, the independent type storage tank may provide a method of drying a ship having a free-standing storage tank for liquefied natural gas, which is transferred to the ship after an insulation test.

In addition, the independent type storage tank may provide a method of drying a ship having a free-standing storage tank for liquefied natural gas, which is transferred to the ship after the outer wall forming the storage space for storing the liquefied natural gas is completed.

Also, the provisional rail is provided at an upper end of a side wall of the hull surrounding the side of the independent storage tank, and provides a method of drying a ship having a free-standing storage tank for liquefied natural gas extending along the extending direction of the hull .

Also, the provisional rail includes a column projecting from a side wall of the hull, and a support plate formed on an upper portion of the column to receive the temporary jig, wherein the provisional rail includes a stand-alone storage tank for liquefied natural gas can do.

In addition, the temporary jig may provide a method of drying a ship having a stand-alone storage tank for liquefied natural gas, which includes a roller portion disposed outside the side wall of the independent storage tank and capable of moving along the temporary rail.

In addition, the independent type storage tank may have inclined surfaces at both upper ends, the temporary jig may include a connecting portion protruding from the inclined surface, an extension extending from the connecting portion to the outside of the independent storage tank, The present invention can provide a method of drying a ship having a free-standing storage tank for liquefied natural gas, which further comprises a bogie portion having a roller portion.

In addition, the bogie may provide a method of drying a ship having a stand-alone type storage tank for liquefied natural gas, including a driving device for driving the independent portion of the independent storage tank by driving the roller portion.

In addition, the hull can be dried in a dock, and the independent storage tank can be transferred to the hull by a sea crane, thereby providing a drying method of a ship having a stand-alone storage tank for liquefied natural gas.

In addition, the sea crane may be connected to the temporary jig to lift up the independent type storage tank, and may provide a method of drying a ship having a separate storage tank for liquefied natural gas.

The independent storage tank may be a separate type storage tank for liquefied natural gas, which is moved to a fixed position by a gantry crane installed in a sea crane or a dock where the hull is dried, or a driving device installed in the temporary jig, The present invention provides a method for drying a ship provided with a vessel.

Further comprising the step of removing the temporary rail and the temporary jig from the hull and the fixed storage tank after the fixing of the fixed storage tank to the fixed position is completed, Can be provided.

According to another aspect of the present invention, there is provided a ship constructed by the method of drying a ship having the independent storage tank for liquefied natural gas as described above.

Embodiments of the present invention can provide a ship having a stand-alone type storage tank for liquefied natural gas and a method of drying the same, which shortens the drying process schedule.

Further, it is possible to provide a ship having a stand-alone type storage tank for liquefied natural gas with improved productivity and a method for drying the same.

Further, it is possible to provide a ship having a stand-alone type storage tank for liquefied natural gas and a method of drying thereof, which can facilitate the performance test of a storage tank to be mounted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart illustrating a method of drying a ship having a free-standing storage tank for liquefied natural gas according to an embodiment of the present invention; FIG.
Fig. 2 is a view showing the shape of a temporary rail installed in the hull in Fig. 1; Fig.
FIG. 3 is a view showing the shape of a temporary jig installed in the independent storage tank in FIG. 1; FIG.
Fig. 4 is a front view of the temporary jig of Fig. 3; Fig.
FIG. 5 is a view showing a state in which a stand-alone storage tank is unloaded to a hull and then moved along a temporary rail in FIG. 1;
FIG. 6 is a view showing a state in which a stand-alone storage tank is loaded on a temporary rail after being unloaded on a hull in FIG. 1;
FIG. 7 is a view showing a ship having a stand-alone storage tank for liquefied natural gas according to another embodiment of the present invention during drying. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a flowchart illustrating a method of drying a ship having a storage tank for liquefied natural gas according to an embodiment of the present invention.

Referring to FIG. 1, a ship having a free-standing storage tank for liquefied natural gas according to an embodiment of the present invention is constructed such that a free-standing storage tank and a hull are independently dried and then a free- .

In the present embodiment, the independent storage tank is a storage tank capable of storing liquefied natural gas (LNG), and the ship is a float on which a stand-alone storage tank can be mounted. For example, LNGC gas carrier, an LNG RV (liquefied natural gas regasification vessel), a LNG FSRU (liquefied natural gas floating storage and regasification unit), LNG FPSO (liquefied natural gas floating, production, storage and off-loading).

Here, the hull refers to a structure in which a hull structure or the like for loading a stand-alone storage tank in a general ship drying process is completed, and the specific shape may be changed depending on the type of ship.

The independent storage tank is an LNG storage tank which is mounted independently on the above-mentioned vessel, and is mounted separately on the hull after being manufactured separately from the hull.

The hull (FIGS. 2 and 10) and the independent storage tank (FIGS. 3 and 20) are manufactured in independent spaces (S100). As described above, the hull can be manufactured up to the state of a hull structure providing a space in which the independent storage tank can be mounted, and the independent storage tank can be manufactured with the outer wall forming the storage space being completed. For example, the hull can be made in the same space as a dry dock, and the stand-alone storage tank can be made in a separate worksite, such as a sidewall, rather than a dock.

At this time, since the independent type storage tank is manufactured in a state in which the outer wall forming the storage space is completed, a test for insulation performance can be completed in a separate space before being mounted on the hull 10.

The idea of the present invention resides in a method of assembling a stand-alone storage tank to a hull and a ship assembled by such a method, and the manufacturing state of the specific hull and the storage tank do not limit the scope of the invention.

Thereafter, a provisional rail is installed in the hull, and a temporary jig is installed in the independent storage tank (S200).

FIG. 2 is a view showing the shape of a temporary rail installed on the hull in FIG. 1, FIG. 3 is a view showing the shape of a temporary jig installed in the independent storage tank in FIG. 1, and FIG. 4 is a front view of the temporary jig shown in FIG.

2 to 4, the hull 10 has a space in which the independent storage tank 20 can be accommodated, and a temporary rail 100 may be installed at an upper end of the side wall of the hull 10 . Here, the sidewall of the hull 10 means a wall which surrounds the side surface of the independent storage tank 20 and faces the side wall of the independent storage tank 20 at a distance from the side wall.

The temporary rail 100 extends along the sidewalls of the hull 10 in the longitudinal direction of the hull 10 and guides the movement of the independent storage tank 20. The temporary rail 100 may be formed in a T shape including a column 110 protruding upward from a side wall of the hull 10 and a support plate 120. The support plate 120 may be formed in a separate storage tank 20, And the column 110 functions to support the support plate 120. The support plate 120 is supported by the support plate 120, In addition, the provisional rails 100 may be provided in pairs on one sidewall for stable support of the independent storage tank 20.

In this embodiment, the provisional rail 100 is provided with a pair of T-shaped sidewalls as described above. However, the shape and number of the temporary rail 100 are merely examples, and the concept of the present invention is not limited thereto . The temporary rail 100 may have various shapes and numbers as long as it can perform the function of guiding the movement of the independent storage tank 20.

The temporary rail 100 may be temporarily fixed to the side wall of the hull 10. That is, it is installed in the ship 10 at the time when the process of mounting the independent type storage tank 20 is performed, and can be removed from the ship 10 when the process of mounting the independent type storage tank 20 is completed in the future. As an example, the temporary rail 100 may be fixed to the upper surface of the side wall of the hull 10 by welding.

The stand-alone storage tank 20 may be provided in a three-dimensional shape having a front side of an octagonal shape having a short sloped corner, as shown in Fig. The independent storage tank 20 may have an inclined surface 21 formed on both sides of the upper portion and the temporary jig 200 may be provided on the inclined surface 21. [ Although the temporary jig 200 is provided on the inclined surface 21 of the independent type storage tank 20 in this embodiment, this is only an example, and the shape of the independent type storage tank 20 may be changed depending on its type The temporary jig 200 can be formed at an appropriate position where it can be supported by the temporary rail 100. [ In this embodiment, the temporary jig 200 is provided on each of the inclined surfaces on both sides of the independent storage tank 20, but the spirit of the present invention is not limited thereto.

The temporary jig 200 includes a connecting portion 210 projecting from the inclined surface 21, an extending portion 220 extending laterally from the connecting portion 210, a bogie portion 230 provided on the extending portion 220, And a roller unit 240 installed in the unit 230.

The connection portion 210 may be formed to protrude upward or laterally with an appropriate length so that the roller portion 240 can be stably mounted on the temporary rail 100. The extension part 220 extends from the connection part 210 and is connected to the roller part 240 so that the independent storage tank 20 can be moved from the fixed position to a side wall of the independent storage tank 20, Can be positioned outside the side wall of the independent storage tank (20). Although the connecting portion 210 and the extending portion 220 are provided in the present embodiment, the two members may be integrally formed in some cases.

The bogie portion 230 may be located at the bottom of the extension portion 220 and may have a larger planar area than the extension portion 220 so that the roller portion 240 can stably bear. In addition, the independent storage tank 20 may be provided with driving means (not shown) for driving the roller portion 240 when it is moved by the magnetic force without being moved by the gantry crane installed in the floating crane or the dock. In addition, when the extending portion 220 is provided in an area large enough to support the roller portion 240, the configuration corresponding to the moving portion 230 may be omitted.

One or more roller units 240 may be provided on the carriage unit 230 so as to be placed on the temporary rail 100 so that the independent storage tank 20 can be moved. In the present embodiment, a single pair of roller units, one pair in the width direction of the hull 10 and one pair in the length direction, are provided in one bogie unit 230. However, It does not.

The roller unit 240 includes a support 242 extending from the carriage 230, a rotary shaft 244 connected to the support 242, a roller 246 connected to the rotary shaft 244, a roller 246 And a guide 248 provided on the outer surface of the temporary rail 100 to prevent the roller portion 240 from being detached from the temporary rail 100.

The rollers 246 are mounted on the support plate 120 of the temporary rail 100 and can slide and the width of the rollers 246 provided on both sides of the rotary shaft 244 corresponds to the width of the support plate 120 It can have a length. The guide 248 may be a plate-like member attached to the outer surface of the roller 246, but having a larger diameter than the roller 246. The roller 246 is positioned on the upper side of the support plate 120 and the guide 248 is positioned on the side of the support plate 120 when the roller unit 240 is seated on the temporary rail 100 The temporary jig 200 may not be separated from the temporary rail 100 even if the direction of movement of the roller 246 is shifted from the extending direction of the temporary rail 110.

Like the temporary rail 100, the temporary jig 200 can also be temporarily fixed to the independent storage tank 20. That is, at the time when the process of mounting the independent type storage tank 20 is performed, it is installed in the independent type storage tank 20, and when the process of mounting the independent type storage tank 20 is completed, . As an example, the temporary jig 200 can be fixed to the inclined surface 21 of the independent type storage tank 20 by welding.

When the installation of the temporary rail 100 and the temporary jig 200 is completed as described above, a floating crane is used to lift the independent storage tank 20, and then the hull 10 in the dock (FIG. 5, 1) (S300).

FIG. 5 is a view showing a state in which a stand-alone storage tank is unloaded to a hull and then moved along a temporary rail in FIG. 1, and FIG. 6 is a state in which a stand- Fig.

The floating crane 30 can be unloaded so that the temporary jig 200 can be seated on the temporary rail 100 when the independent storage tank 20 is unloaded. In this embodiment, the use of the floating crane 30 is described as an example, but the means for moving the independent storage tank 20 to the hull 10 is not limited to the floating crane 30.

The floating crane 30 can move the independent storage tank 20 by connecting the chain to the temporary jig 200 installed in the independent storage tank 20. The chain may be connected to the temporary jig 200 in a winding manner, or the temporary jig 200 may be provided with a lug (not shown) for connecting the chain.

The stand-alone storage tank 20 moves to the fixed position along the temporary rail 100 after the temporary jig 200 is mounted on the temporary rail 100 (S400).

The independent storage tank 20 can be moved by the floating crane 30. For example, when the hull 10 is dried in a floating dock, the floating crane 30 unloads the independent storage tank 20 to the temporary rail 100, It is possible to move along the temporary rail 100. Alternatively, when the hull 10 is dried in the dry dock, the independent storage tank 20 can be moved using a gantry crane installed in the dry dock. In this case, the gantry crane moves the stand-alone storage tank 20 along the temporary rail 100 in the horizontal direction, so that the allowable weight may not be up to the level where the stand-alone storage tank 20 is lifted. Alternatively, in the case where the temporary jig 200 is provided with the drive means for moving the self-moving jig 200 on the carriage 230, the self-contained storage tank 20 may be moved by itself after unloading.

In the course of the movement of the independent type storage tank 20, the guide 248 of the roller portion 240 prevents the roller 246 from coming off. The independent storage tank 20 is stable . ≪ / RTI >

When the independent type storage tank 20 is moved to the right position along the temporary rail 100, the independent storage tank 20 is fixed to the hull 10 at the corresponding position.

A plurality of independent storage tanks 20 may be mounted on the hull 10 so that the independent storage tanks 20 to be installed on the innermost storage tank 20 can be sequentially mounted. In steps S300 and S400, 20) may be mounted (S500).

The temporary rail 100 and the temporary jig 200 are removed from the hull 10 and the independent storage tank 20 when the installation of the hull 10 and the fixing of the fixed position of the independent storage tank 20 are completed (S600) .

The temporary rail 100 and the temporary jig 200 thus removed can be recycled again in future drying of other ships. In the present embodiment, all the independent storage tanks 20 are installed and then the temporary jig 200 is removed. However, after one independent storage tank 20 is fixed in place, 200 may be removed, and the provisional jig 200 may be installed in the independent storage tank 20 to be installed next.

When the removal of the temporary rail 100 and the temporary jig 200 is completed, a subsequent drying process can be performed to dry the ship.

According to the ship having the independent storage tank for liquefied natural gas and the drying method thereof according to the embodiment of the present invention as described above, since the independent storage tank 20 can be quickly mounted on the ship 10, Can be shortened. In particular, since the independent-type storage tank 20 and the hull 10 can be simultaneously dried, the drying process can be remarkably shortened.

In addition, by shortening the drying process schedule, it is possible to reduce the labor cost and the dock use cost for ship construction, thereby improving the productivity.

Particularly, the temporary rail 100 and the temporary jig 200 used for installing the independent storage tank 20 can be recycled, so that productivity can be further increased when a plurality of ships are dried.

Since the insulation test can be performed before the independent type storage tank 20 is mounted on the hull 10, it is possible to carry out the insulation test very easily compared with the conventional method of assembling the hull 10, Time can be shortened and productivity can be further improved.

Hereinafter, a method of drying a ship having a separate storage tank for liquefied natural gas according to another embodiment of the present invention will be described with reference to FIG. However, the other embodiment differs from the above embodiment in that a space for mounting the storage tank on the hull is provided in two rows. Therefore, the differences will be mainly described, and the same portions will be described with reference to the description of the embodiment Quot;

FIG. 7 is a view showing a ship having a self-contained storage tank for liquefied natural gas during drying according to another embodiment of the present invention.

Referring to FIG. 7, a space in which the independent storage tank 20 'can be mounted is present in two rows in the longitudinal direction of the hull 10'. That is, the center portion of the ship 10 'may be provided with a coffer dam 11' for partitioning a space in which the independent storage tank 20 'is mounted.

The temporary rail 100 'may be provided not only on the side wall of the ship 10' but also on the copper dam 11 '. Since the temporary rail 100 'provided on the upper side of the coffer dam 11' must guide the movement of the independent storage tank 20 'to be disposed on both sides of the coffer dam 11' A total of four rails can be installed.

The independent storage tank 20 'mounted on the left side of the ship 10' is provided with a temporary rail 100 'installed on the left wall of the ship 10' and a temporary rail 100 'disposed on the left side of the copper dam 11' And the independent storage tank 20 'mounted on the right side of the hull 10' is moved along the right side of the cofferdam 11 'and the temporary rail 100' installed on the right wall of the hull 10 ' Can be moved along the temporary rail 100 'disposed on the temporary rail 100'.

The independent storage tank 20 'may have the temporary jig 200' on both sides as in the previous embodiment.

As described above, even if a ship in which two independent storage tanks 20 'are arranged in the ship 10', the idea of the present invention can be used as it is.

Although the present invention has been described in connection with the specific embodiments of the ship having the independent storage tank for liquefied natural gas and the drying method thereof according to the embodiments of the present invention, the present invention is not limited thereto. Should be construed as having the broadest scope consistent with the basic idea. Skilled artisans may implement a pattern of features that are not described in a combinatorial and / or permutational manner with the disclosed embodiments, but this is not to depart from the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

1: Dock 10, 10 ': Hull
100, 100 ': Temporary rail 110: Column
120: support plate 20, 20 ': independent storage tank
200, 200 ': temporary jig 210: connection
220: extension part 230:
240: roller portion 242:
244: rotating shaft portion 246: roller
248: Guide

Claims (13)

A method of drying a ship having a free-standing storage tank for liquefied natural gas,
Separately drying the hull and the independent storage tank;
Installing a temporary rail on the hull and installing a temporary jig in the independent storage tank to move along the temporary rail;
Transferring the independent storage tank to the hull, and placing the temporary jig on the temporary rail;
Moving the stand-alone storage tank to a predetermined position along the temporary rail; And
Securing the stand-alone storage tank in the correct position
And a free-standing storage tank for liquefied natural gas. The method according to claim 1,
The self-contained storage tank is preferably a self-
A method of drying a ship having a free-standing storage tank for liquefied natural gas. The method according to claim 1,
The self-contained storage tank is constructed such that after the outer wall forming the storage space for storing the liquefied natural gas is completed,
A method of drying a ship having a free-standing storage tank for liquefied natural gas. The method according to claim 1,
The temporary rail is installed at the upper end of the side wall of the hull surrounding the side of the independent storage tank,
Extending along the direction of extension of the hull
A method of drying a ship having a free-standing storage tank for liquefied natural gas. 5. The method of claim 4,
The temporary rail includes:
A column projecting from a side wall of the hull;
And a supporting plate formed on the upper portion of the column to receive the temporary jig
A method of drying a ship having a free-standing storage tank for liquefied natural gas. The method according to claim 1,
The temporary jig includes a roller portion disposed outside the side wall of the independent storage tank and capable of moving along the temporary rail
A method of drying a ship having a free-standing storage tank for liquefied natural gas. The method according to claim 6,
Wherein the independent type storage tank has inclined surfaces at both upper end portions thereof,
The temporary jig includes:
A connecting portion projecting from the inclined surface,
An extension extending outwardly of the independent storage tank from the connection, and
And a braking portion provided on the extension portion and provided with the roller portion
A method of drying a ship having a free-standing storage tank for liquefied natural gas. 8. The method of claim 7,
And the braking unit includes a drive unit for driving the roller unit to move the independent storage tank
A method of drying a ship having a free-standing storage tank for liquefied natural gas. The method according to claim 1,
The hull is dried in the dock,
Said independent storage tank having a stand-alone storage tank for liquefied natural gas to be transferred to said hull by a floating crane. 10. The method of claim 9,
Wherein the floating crane is connected to the temporary jig to lift up the independent storage tank. The method according to claim 1,
The independent storage tank is transferred to the hull,
A floating cranes or a gantry crane installed in a dock where the hull is to be dried, or a stand-alone storage tank for liquefied natural gas moving to a predetermined position by a driving device installed in the temporary jig. The method according to claim 1,
Further comprising the step of removing the temporary rail and the temporary jig from the hull and the independent storage tank after the fixed position of the independent storage tank is completed. A ship constructed by a method of drying a ship having a stand-alone storage tank for liquefied natural gas according to any one of claims 1 to 12.

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