KR20120135493A - Cargo for liquefied gas carrier ship - Google Patents

Abstract

PURPOSE: A cargo hold for a liquefied gas carrier ship is provided to reduce thermal stress between an auxiliary barrier and an auxiliary panel by using a block with same thermal shrinkage rate as an auxiliary barrier. CONSTITUTION: A cargo hold for a liquefied gas carrier ship comprises a main barrier(10), an insulation panel assembly(20), and an outer wall(30). The main barrier surrounds a receiving space for receiving liquefied gas. The insulation panel assembly surrounds the main barrier. The outer wall surrounds the insulation panel assembly. The insulation panel assembly comprises an upper insulation panel structure, a lower insulation panel structure, an auxiliary barrier(500), and a block. The auxiliary barrier is positioned between the upper insulation panel structure and the lower insulation panel structure. The block is inserted in a first recessed part formed at least one of the upper and lower insulation panel structures.

Description

Cargo hold for liquefied gas transportation ship {CARGO FOR LIQUEFIED GAS CARRIER SHIP}

The present invention relates to a cargo hold of a liquefied gas transportation vessel, and more particularly to a cargo hold of a liquefied gas transportation vessel including a plurality of heat insulation panels.

Liquefied gas refers to a colorless, transparent cryogenic liquid whose natural gas, which contains methane as its main component, is cooled to -162 ° C and its volume is reduced to one hundredth of a million.

As such liquefied gas is used as an energy resource, an efficient transportation method for transporting a large amount from the production base to the demand destination has been considered in order to use this gas as energy. Liquefied gas transport ships have been developed for sea transport.

By the way, the liquefied gas transport ship should be provided with a cargo hold (Cargo) that can store and store the liquefied gas liquefied in the cryogenic state, there was a lot of difficulties due to the very demanding conditions.

That is, since the liquefied gas has a vapor pressure higher than atmospheric pressure, and has a boiling temperature of about -162 ° C, in order to safely store and store such a liquefied gas, the cargo hold for storing the liquefied gas is a material that can withstand ultra low temperatures, for example, It should be made of aluminum steel, stainless steel, 35% nickel steel, etc., and should be designed with a unique insulation panel structure that is resistant to other thermal stress and heat shrinkage and prevents heat intrusion.

1 is a sectional view showing a cargo hold of a liquefied gas transport ship. The cargo hold of the LNG carrier includes a kitchen wall 10 surrounding the receiving space in which the liquefied gas is accommodated, an insulation panel assembly 20 surrounding the kitchen wall 10, and an outer wall 30 surrounding the kitchen wall 10. .

Usually, the outer wall 30 is made of a hull. In order to improve the heat insulation performance and improve the airtightness, the two-stage heat insulating panels 100 and 700 are usually stacked . An auxiliary barrier 500 is installed between the lower heat insulating panel 100 and the upper heat insulating panel 700 in case the main wall 10 is broken. At this time, auxiliary panels 200 and 600 may be installed above and below the auxiliary barrier to facilitate installation of the auxiliary barrier.

Thermal stress due to difference in heat shrinkage occurs between the heat insulating panels 100 and 700, the auxiliary panels 200 and 600, and the auxiliary barrier 500. This thermal stress is a major cause of deformation of cargo holds and weakening airtightness. Various techniques have been developed to solve this thermal stress.

Korean Patent Publication No. 10-0748819 discloses an insulation board fixing device for an LNG carrier cargo hold.

Korean Registered Patent Publication No. 10-0748819 (August 13, 2007)

In the embodiment of the present invention, a block is inserted into the depression of the sub-panel and is joined to the sub-barrier by welding or the like to secure the coupling between the sub-panel and the sub-barrier, To provide a cargo hold of the transportation vessel.

According to an aspect of the present invention, in the cargo hold of the liquefied gas transport ship including a kitchen wall surrounding the receiving space in which the liquefied gas is accommodated, the insulation panel assembly surrounding the kitchen wall, and an outer wall surrounding the insulation panel assembly. The heat insulation panel assembly includes: an upper heat insulation panel structure; Lower insulation panel structure; An auxiliary barrier positioned between the upper insulation panel structure and the lower insulation panel structure; And a block inserted into a first depression formed in at least one of the upper and lower thermal insulation panel structures, wherein the block is provided with a cargo hold of a liquefied gas transportation vessel engaged with the auxiliary barrier .

The upper insulation panel structure may include an upper sub-panel between the upper insulation panel and the auxiliary barrier, and the first depression may be provided with a cargo hold of the liquefied gas transportation vessel formed in the upper sub-panel.

The lower thermal insulation panel structure may further include a lowered sub-panel between the lower insulation panel and the auxiliary barrier, and a cargo hold of the liquefied gas transportation vessel may be provided.

The block may be provided with a cargo hold of a liquefied gas transportation vessel that is spaced apart from the first depression in a direction perpendicular to the z-axis.

And the height of the block may be less than the depth of the first depression to provide a cargo hold of the liquefied gas transportation vessel.

The combination of the auxiliary barrier and the block may be provided with a cargo hold of a liquefied gas transport vessel which is a welded connection.

The cargo hold of the liquefied gas transportation vessel may further be provided which further comprises a joining member for joining the block with the upper or lower heat-insulating panel structure.

Wherein the block has a hole and a threaded portion is formed on the outer surface of the hole and the coupling member includes a bolt passing through the upper heat insulating panel structure or the lower heat insulating panel structure and fastened to a threaded bone of the block Cargo holds may be provided.

Wherein the upper insulation panel structure has a second depression that is shallower than the first depression and wider in a direction perpendicular to the z axis on the surface on which the first depression is formed, Wherein a peripheral portion of the block has a stepped shape having a height corresponding to a depth of the second depression and is inserted into the second depression and covers the periphery of the block A cargo hold of a liquefied gas transportation vessel further comprising a fixing piece may be provided.

Wherein the lower insulation panel structure includes a second depression on a surface of the first depression, the depression being shallower than the first depression and wider in a direction perpendicular to the z axis, Wherein a peripheral portion of the block has a stepped shape having a height corresponding to a depth of the second depression and is inserted into the second depression and covers the periphery of the block A cargo hold of a liquefied gas transportation vessel further comprising a fixing piece may be provided.

The fixing piece may have a hollow shape so as to include a central portion of the block therein, and a cargo window of a liquefied gas transportation vessel coupled with the upper insulating panel structure may be provided.

The cargo hold of the liquefied gas carrier according to the embodiment of the present invention can block the thermal stress between the auxiliary barrier and the auxiliary panel by using a block having the same heat shrinkage rate as the auxiliary barrier.

In addition, thermal stress can be eliminated by providing a gap to allow the block connected thereto to move in the width direction of the sub-panel due to heat shrinkage of the sub-barrier.

Further, the auxiliary barrier and the block may be made of the same material and joined together by welding, whereby the airtightness can be prevented from being weakened.

1 is a sectional view showing a cargo hold of a liquefied gas transport ship.
2 is a part view of an insulating panel assembly according to an embodiment of the present invention.
3 is an assembled cross-sectional view of an insulating panel assembly according to an embodiment of the present invention.
4 is a perspective view illustrating a movement of the heat insulating panel assembly according to an embodiment of the present invention by thermal stress.

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

The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

2 is a part view of an insulating panel assembly 20 according to an embodiment of the present invention, and Fig.

The cargo hold of the liquefied gas accommodating ship according to an embodiment of the present invention includes a kitchen wall 10 surrounding an accommodation space in which liquefied gas is accommodated, an insulation panel assembly 20 surrounding the kitchen wall 10, and an insulation panel assembly ( And an outer wall 30 surrounding 20.

The heat insulating panel assembly 20 includes a lower insulating panel 100 coupled to the outer wall 30 with a mastic 31, a lower sub panel 200 fixed to the + z direction surface, a lower sub panel 200, Z direction surface of the upper sub-panel 600, an auxiliary barrier 500 which is closely connected to the + z direction surface of the upper sub-panel 600, an upper sub- And an upper insulating panel 700 fixed to the upper surface of the lower panel.

Generally, a heat-insulating panel is made of a lightweight material such as a polyurethane foam, which is excellent in heat insulation performance. Between the lower insulation panel 100 close to the outer wall 30 and the upper insulation panel 700 close to the kitchen wall 10, an auxiliary barrier 500 is prepared in case the kitchen wall 10 allows the intrusion of the outside. Located. At this time, the thermal shrinkage is different between the auxiliary barrier 500 and the heat insulating panel due to the amount of heat shrinkage. This thermal stress leads to poor contact of the auxiliary barrier 500, which becomes a threat to airtightness. Thus, it is very important to solve the thermal stress generated between the elements of the insulation panel assembly 20 made of different materials.

The auxiliary panels 200 and 600 are inserted between the heat insulating panels 100 and 700 and the auxiliary barrier 500 to reduce thermal stress and improve airtightness. That is, the lower auxiliary panel 200 is fixed to the lower insulating panel 100, and the upper auxiliary panel 600 is fixed to the upper insulating panel 700. The auxiliary panel is usually plywood, and the auxiliary barrier 500 is made of SUS or the like.

The auxiliary barrier 500 inserted between the lower auxiliary panel 200 and the upper auxiliary panel 600 may be combined with the auxiliary panels 200 and 600 on both sides by adhesive or the like. However, in this case, heat shrinkage amounts of the auxiliary panels 200 and 600 and the auxiliary barrier 500 are different from each other, and thermal stress is generated, which causes adhesion failure of the auxiliary barrier 500.

Insulating panel assembly 20 according to an embodiment of the present invention may not be bonded between the auxiliary panel (200, 600) and the auxiliary barrier (500). In order to prevent separation of the upper and lower auxiliary panels 600 and 600, the block 300 and the fixing pieces 400 are inserted to prevent separation of the lower and upper auxiliary panels 200 and 500, A joining member 800 is used.

The block 300 is inserted into the first depression 210 formed on the + z direction surface of the lower sub panel 200 and is coupled to the auxiliary barrier 500 by welding or the like (see FIG. The first depressed portion 210 is preferably not penetrated. If it penetrates, the airtightness is weakened.

When the block 300 is inserted into the first depression 210, the block 300 is spaced apart from the first depression 210 in the direction perpendicular to the z-axis (or x-y plane direction). At this time, when the auxiliary barrier 500 is thermally shrunk, the block 300 can slide in the contraction direction of the auxiliary barrier 500. The width of the first depression 210 is determined so that the block and the lower sub-panel 200 are spaced apart from each other in the x-y plane direction by the resultant value.

The first depression 210 and the block 300 may be cylindrical. In this case, even sliding along the contraction direction is possible. That is, the diameter of the first depression 210 in the x-y plane direction is larger than the diameter of the block 300 in the x-y plane direction by the heat shrinkage amount of the auxiliary barrier 500 or larger.

The height of the central part 320 and the peripheral part 330 of the block 300 are different from each other. The central portion 320 is a portion where the auxiliary barrier 500 is coupled, and the peripheral portion 330 is prevented from being separated in the + z direction by the fixing piece 400 coupled with the lower auxiliary panel 200. This is for part.

The lower sub-panel 200 creates a second depression 220 around the first depression 210. The second depressed portion 220 includes a first depressed portion 210 at the center and is shallower than the first depressed portion 210 and is wider in the vertical direction of the z-axis.

The block 300 is inserted into the first depression 210 and the fixing piece 400 is inserted into the second depression 220 and coupled with the lower sub panel 200. [ At this time, the fixing may be by bolts or rivets 410 and may be by adhesion. Hereinafter, the bonding and adhesion by bolts or rivets 410 collectively referred to as bonding.

The auxiliary barrier 500, the block 300 and the fixing piece 400 may use the same material as each other. Therefore, it can be seen paradoxically that the joining of the lower sub-panel 200 and the fixing piece 400 does not bond between the sub-barrier 500 and the lower sub-panel 200. However, since the area where the fixing member 400 and the lower sub-panel 200 are bonded is very small, the degree of deformation due to thermal stress is small, so that bonding is possible. For a more firm coupling may also be considered to combine with the bolt or rivet 410.

And the shape of the hollow ring of the shape of the fixing piece 400 is the shape of the hollow ring. In the hollow portion, the central portion 320 of the block 300 is positioned and the peripheral portion 330 of the block 300 is positioned below the ring surface. That is, the peripheral portion 330 of the block 300 is positioned between the fixing piece 400 and the upper sub-panel 600. Therefore, the block 300 is limited to the movement in the + z direction by the fixed fixing piece 400.

In more detail with respect to the shape of the block 300, the center portion 320 of the block 300 has a height corresponding to the + z direction of the lower sub-panel 200, the peripheral portion 330 is a second depression It has a height corresponding to the depth surface of the portion 220. In this case, the corresponding height does not mean the same height.

Generally, the plywood used as the material of the lower sub-panel 200 has a greater degree of shrinkage in the + z direction from the cryogenic temperature as compared with the metal that can be used as the material of the block 300 and the fixing piece 400. Therefore, the height of the fixing piece 400 in anticipation of the degree of shrinkage is lower in the height of the center portion 320 than in the + z direction of the lower sub-panel 200, and the peripheral portion than the height corresponding to the depth surface of the second recess 220. The height of 330 becomes lower.

The coupling member 800 is for coupling the auxiliary barrier 500 and the upper auxiliary panel 600. The fixing member 400 is used for coupling the auxiliary barrier 500 and the lower sub-panel 200, thereby confirming that the block 300 is fixed. The combination of the auxiliary barrier 500 and the upper sub-panel 600 uses the fixed block 300. That is, the upper and lower auxiliary panels 600, 600, and 300 are bolted or riveted to fix the auxiliary barrier 500 and the upper auxiliary panel 600 by the fixed block 300 do.

As an example of the coupling member 800, a stud bolt 810 is taken as an example. A hole is formed in the center of the block 300 and a threaded hole 310 is formed on the outer surface of the hole. A stud bolt 810 is inserted into the threaded hole 310 through the upper and lower auxiliary panels 600 and 500. The washer 820 and the nut 830 are fastened to the + z-axis face of the upper sub-panel 600 to complete the heat insulating panel assembly 20.

4 is a perspective view showing a movement of the heat insulating panel assembly 20 according to an embodiment of the present invention by thermal stress.

The fixing piece 400 has a space separated from the first depressed portion 210 or the second depressed portion 220 and the height of the peripheral portion 330 is lower than the bottom surface of the second depressed portion 220, (320) is lower than the + z direction plane of the lower sub-panel (200). Although the auxiliary barrier 500 is considered in FIG. 4, the block 300 shows that the block 300 coupled with the auxiliary barrier 500 by welding or the like moves along the xy-plane heat shrinkage of the auxiliary barrier 500 .

In the embodiment of the present invention, the first depression formed on the lower sub-panel located on the + z-direction of the lower adiabatic panel is disclosed, but the first sub-panel is formed on the lower adiabatic panel and the lower sub-panel is formed.

Also, in the embodiment of the present invention, the first and second depressions are formed in the lower or the lower sub-panel, and thus, the block and the coupling member are coupled to each other. However, The first depressed portion and the second depressed portion are formed so that the block and the engaging member are engaged.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Therefore, the true scope of the invention should be defined only by the appended claims.

10: kitchen wall, 20: insulation panel assembly,
30: outer wall, 31: mastic,
100: lower insulation panel, 200: lower sub-panel,
210: first depression, 220: second depression,
300: block, 310: thread,
320: central portion, 330: peripheral portion,
400: Fixing piece, 410: Rivet,
500: auxiliary barrier, 600: upper auxiliary panel,
700: upper insulation panel, 800: coupling member,
810: stud bolt, 820: washer,
830: nut,

Claims (11)

In the cargo hold of the liquefied gas transport ship comprising a kitchen wall surrounding the receiving space in which liquefied gas is accommodated, an insulating panel assembly surrounding the kitchen wall, and an outer wall surrounding the insulating panel assembly,
The insulation panel assembly,
An upper insulation panel structure;
Lower insulation panel structure;
An auxiliary barrier positioned between the upper insulation panel structure and the lower insulation panel structure; And
And a block inserted into the first recessed portion formed in at least one of the upper insulation panel structure or the lower insulation panel structure.
The block is a cargo hold of the liquefied gas transport ship coupled with the auxiliary barrier. The method of claim 1,
The upper insulating panel structure includes an upper auxiliary panel between the upper insulating panel and the auxiliary barrier,
The first recess is a cargo hold of the liquefied gas transport ship is formed in the upper auxiliary panel. The method of claim 2,
The lower insulating panel structure is a cargo hold of the liquefied gas transport ship further comprises a lower auxiliary panel between the lower insulating panel and the auxiliary barrier. The method of claim 1,
The block is a cargo hold of the liquefied gas transport ship spaced apart in the vertical direction of the z-axis and the first recess. The method of claim 1,
Wherein the height of the block is less than the depth of the first depression. The method of claim 1,
The cargo barrier of the liquefied gas transport ship is a coupling of the auxiliary barrier and the block. The method of claim 1,
Cargo hold of the liquefied gas transport ship further comprises a coupling member for coupling the upper insulation panel structure or the lower insulation panel structure and the block. The method of claim 7, wherein
The block is provided with a hole, the outer surface of the hole is formed with screw bone,
Wherein the coupling member comprises a bolt passing through the upper or lower thermal insulation panel structure and fastened to a threaded bone of the block. The method according to any one of claims 1 to 8,
The upper insulating panel structure has a second recessed portion that is shallower than the first recessed portion and wider in the vertical direction of the z-axis on a surface where the first recessed portion is formed,
The central portion of the block has a height corresponding to the side facing the auxiliary barrier of the upper insulation panel structure,
The periphery of the block has a stepped shape having a height corresponding to the depth face of the second depression,
Cargo hold of the liquefied gas transport ship further comprises a fixing piece inserted into the second recessed portion covering the periphery of the block. The method according to any one of claims 1 to 8,
The lower insulating panel structure includes a second recessed portion having a depth smaller than that of the first recessed portion and wider in the vertical direction of the z-axis on a surface where the first recessed portion is formed,
The central portion of the block has a height corresponding to the side facing the auxiliary barrier of the lower insulating panel structure,
The periphery of the block has a stepped shape having a height corresponding to the depth face of the second depression,
Cargo hold of the liquefied gas transport ship further comprises a fixing piece inserted into the second recessed portion covering the periphery of the block. The method of claim 10,
The fixing piece has a hollow shape so as to include a central portion of the block therein, the cargo hold of the liquefied gas transport ship coupled with the upper insulation panel structure.

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