KR20160046518A - Barrier structure of lng storage tank and method for assembling the barrier structure, and the lng storage tank with the barrier structure - Google Patents

Abstract

Disclosed is a barrier structure of a liquefied natural gas (LNG) storage tank, which is installed on the inner surface of an LNG storage tank to prevent LNG leakage. The barrier structure of an LNG storage tank, according to an embodiment of the present invention, comprises: an insulation wall which cuts off the transfer of heat between the outside and inside of the storage tank; a secondary sealing wall which is stacked on the insulation wall; a primary sealing wall which is loaded on the secondary sealing wall to be separated from the secondary sealing wall and directly comes in contact with LNG; a spacer which is inserted between the primary and secondary sealing walls to maintain the interval between the primary and secondary sealing walls; and a fixing unit which fixes the spacer to the secondary sealing wall.

Description

FIELD OF THE INVENTION The present invention relates to a liquefied natural gas storage tank barrier structure, a method of assembling the barrier structure, and a liquefied natural gas storage tank having the barrier structure. BACKGROUND OF THE INVENTION STRUCTURE}

The present invention relates to a barrier structure of a liquefied natural gas storage tank and a method for assembling the barrier structure. More particularly, the present invention relates to a barrier structure for a liquefied natural gas storage tank, And a barrier structure for performing a sealing function and a method of assembling the barrier structure.

Generally, Liquefied Natural Gas (LNG) is a liquefied natural gas, which is one of the fossil fuels. Liquefied natural gas storage tanks are installed on the ground or buried in land, And portable storage tanks installed in transportation means such as ships.

The above-mentioned liquefied natural gas has a danger of explosion when exposed to impact, and is stored at a very low temperature. The storage tank for storing the liquefied natural gas has a structure in which impact resistance and liquid tightness are maintained firmly.

Such a storage tank is somewhat different in that the structure of a liquefied natural gas storage tank installed in an automobile or a ship having a flow should be prepared against the mechanical stress caused by the flow, have. However, since a liquefied natural gas storage tank installed in a vessel provided with a measure against mechanical stress can be used for a land storage tank as a matter of course, the structure of a liquefied natural gas storage tank installed on a ship will be described as an example.

1 is a schematic cross-sectional view of a ship equipped with a liquefied natural gas storage tank according to the prior art.

As shown in Fig. 1, a ship on which a liquefied natural gas storage tank is installed has a double structure consisting of an outer wall 16 forming an outer shape and an inner wall 12 formed inside the outer wall 16 Have a hull. The inner wall 12 and the outer wall 16 of the ship 1 are integrally connected to each other by a reinforcing member 13 such as a connecting rib or the like so that the inner wall 12 and the outer wall 16 are integrally formed. It may be made of hull.

Also, the interior of the hull, i.e. the interior of the inner wall 12, can be divided by one or more partitions 14. The partition wall 14 may be formed by a known cofferdam installed in a conventional vessel for transporting liquefied natural gas.

Each of the internal spaces divided by the partition wall 14 can be utilized as a storage tank 10 for loading cryogenic liquid such as liquefied natural gas.

Here, the inner circumferential wall surface of the storage tank 10 is sealed in a liquid-tight state by the sealing wall 50. That is, the sealing wall 50 forms a single storage space by integrally connecting a plurality of metal plates by welding, so that the storage tank 10 can store and transport liquefied natural gas without leakage do.

Wrinkles may be formed in the sealing wall 50, which is in direct contact with the liquefied natural gas in a cryogenic condition, in order to cope with the temperature change of the liquefied natural gas according to the line load as known in the art.

This sealing wall 50 is fixedly connected to the inner wall 12 or the partition 14 of the vessel 1 by a plurality of anchor structures 30. [ Therefore, the sealing wall 50 is not movable relative to the hull.

An insulating wall is arranged between the sealing wall (50) and the inner wall (12) or the partition wall (14) so as to form a heat insulating layer. This insulating wall has a corner structure 20 disposed at a corner portion of the storage tank 10, an anchor structure 30 disposed at the periphery of an anchor member (not shown) And a planar structure 40 to be disposed. That is, the entire insulating layer can be formed in the storage tank 10 by the corner structure 20, the anchor structure 30, and the planar structure 40.

Here, the anchor structure 30 is composed of a bar-shaped anchor member directly connecting and fixing the hull and the sealing wall, and a heat insulating material provided around the anchor member.

The sealing wall 50 is mainly supported by the anchor structure 30 and the corner structure 20 and the planar structure 40 support only the load of the LNG applied to the sealing wall 50, 30).

FIG. 2 is a cross-sectional view of a part of a storage tank of a liquefied natural gas according to the prior art, which is registered in Korean Patent No. 4,997,105.

The conventional liquefied natural gas storage tank 10 shown in Fig. 2 has secondary insulation walls 22, 32 and 42 and primary insulation walls 24 and 24 on the inner wall 12 or partition wall 14 constituting a part of the hull. 34, 44) are sequentially installed and secondary sealing walls 23, 33, 43 are installed between the secondary insulating walls 22, 32, 42 and the primary insulating walls 24, 34, do. Further, a primary sealing wall 50 is provided on the upper portion of the primary heat insulating walls 24, 34, 44.

The liquefied natural gas storage tank 10 constructed as described above includes a corner structure 20 provided at an inner corner portion thereof, an anchor structure 30 provided at a predetermined interval on the bottom surface thereof, And a planar structure 40 inserted between the structures 30 so as to be slidably installed. At this time, the corner structure 20, the anchor structure 30, and the planar structure 40 are assembled in the storage tank 10 after being previously manufactured as respective unit modules, and the primary sealing wall 50, (LNG) can be stored in the inner space by providing the heat-insulating wall with liquid-tightness.

2, the corner structure 20, the anchor structure 30, and the planar structure 40 are provided with respective primary insulation walls 24, 34, 44, secondary insulation walls 22, 32, 42 and secondary sealing walls 23, 33, 43, which are collectively referred to as barrier structures 20, 30, 40.

On the other hand, in the respective barrier structures 20, 30 and 40, the secondary sealing walls of the unit modules and the contact surfaces of the respective heat insulating walls are integrally formed by bonding with an adhesive. Typically, the secondary insulation walls 22, 32, and 42 may be formed of a polyurethane foam, which is an insulating material, and a plate material attached to the lower part thereof. The primary insulation walls 24, 34, and 44 may be formed of a polyurethane foam and a plate material adhered on the polyurethane foam. Further, the primary sealing wall is provided on the upper side of the primary heat insulating walls (24, 34, 44) and fixed to the anchor structure (30) by welding.

A flange 42a is formed at a lower end of the secondary heat insulating wall 42 of the planar structure 40 so as to be larger than the secondary heat insulating wall 42. [ The flange 42a is inserted into a groove formed in the lower end of the anchor structure 30, and is installed to be capable of sliding movement.

In the illustrated example, each anchor structure 30 has an anchor support rod 36, a lower fixing member 37, an anchor secondary insulation wall 32, and an anchor primary insulation wall 34, and the anchor 2 A secondary sealing wall 33 is connected between the car insulating wall 32 and the anchor primary insulating wall 34. One end of the anchor support rod 36 is connected to the primary sealing wall 50 and the other end is connected to the inner hull wall 12 by the fixing member 37.

Meanwhile, the anchor structure 30 is welded to the upper end of the anchor support rod 36 by welding the primary seal wall 50.

The anchor structure 30 is located at the connection point of the adjacent planar structures 40 and interconnects the planar structures 40. The planar structure 40 is connected to the inner wall 12 or the partition 14 . Further, the fixing member 37 of the anchor structure 30 is provided around the anchor support rod 36. [

However, the conventional liquefied natural gas storage tank is composed of a secondary insulation wall, a secondary sealing wall, a primary insulation wall and a primary sealing wall in which the barrier structure is sequentially stacked, The structure for connecting the wall is complicated, and the installation work of the heat insulating wall is not easy. In addition, there is a concern that the structure and installation work of the connecting portion of the anchor portion and the secondary sealing wall are difficult, and the reliability of the sealing of the LNG is lowered in the secondary sealing wall, thereby causing leakage of LNG.

It is an object of the present invention to solve the above problems and to provide a liquefied natural gas storage tank in which the structure of the heat insulating wall and the sealing wall and the bonding structure thereof are simplified and the work is facilitated, The present invention provides a barrier structure of a liquefied natural gas storage tank and an assembly method of the barrier structure that can shorten the drying time of the tank by simplifying the assembly structure and the manufacturing process.

According to an aspect of the present invention, there is provided a barrier structure of a liquefied natural gas storage tank installed on an inner surface of a storage tank for loading liquefied natural gas to prevent leakage of liquefied natural gas, An insulating wall for blocking off; A secondary sealing wall laminated on the heat insulating wall; A primary sealing wall laminated on the secondary sealing wall and directly contacting the liquefied natural gas; Spacers interposed between said primary and secondary sealing walls to maintain spacing between said primary and secondary sealing walls; Fixing means for fixing the spacer on the secondary sealing wall; Wherein the liquefied natural gas storage tank is provided with a barrier structure of a liquefied natural gas storage tank.

The fixing means may include a lower body fixedly attached to the secondary sealing wall and an upper body coupled to the lower body while supporting the spacer.

One of the lower body and the upper body may have an insertion hole, and the other of the lower body and the upper body may have a coupling protrusion coupled to the insertion hole.

The lower body includes a bottom portion abutting against the secondary sealing wall and a cylindrical lower sidewall extending from the bottom portion, and a plurality of insertion holes may be formed in the lower sidewall with a predetermined interval.

The upper body may include a cylindrical upper sidewall inserted into the lower body and a flange extending outwardly in a vertical direction from an upper edge of the upper sidewall and the upper sidewall may be resiliently coupled to the lower sidewall A plurality of coupling protrusions may be formed at regular intervals.

The spacer may include a flat spacer disposed between the flat surfaces of the primary and secondary sealing walls and a groove spacer having a groove to be disposed around the corrugation of the primary and secondary sealing walls .

The groove spacer may be formed of a piece of plywood formed with the groove portion to form a groove portion corresponding to the wrinkle portion or may be manufactured by combining a plurality of pieces of plywood to have the shape of the groove portion .

The spacer is not interposed between the wrinkle portion and the wrinkle portion respectively formed in the primary sealing wall and the secondary sealing wall but can be disposed only on the flat portion between the primary sealing wall and the secondary sealing wall.

The spacer may include a fixing hole through which the lower body of the fixing means can pass.

The spacer may include a step portion around the fixing hole where the upper body of the fixing means is caught.

According to another aspect of the present invention, there is provided a liquefied natural gas storage tank having a barrier structure for preventing leakage of liquefied natural gas, the barrier structure comprising: a laminate on an insulating wall for blocking heat transfer between the outside and the inside of the storage tank; A primary sealing wall directly contacting the liquefied natural gas, a spacer interposed between the primary sealing wall and the secondary sealing wall, and fixing means for fixing the position of the spacer, Wherein the securing means comprises a lower body attached to the secondary sealing wall and an upper body coupled to the lower body while the spacer is sandwiched by the flange portion do.

According to another aspect of the present invention, there is provided a method of assembling a barrier structure of a liquefied natural gas storage tank installed on an inner surface of a storage tank for loading liquefied natural gas to prevent leakage of liquefied natural gas, Laminating an insulating wall and a secondary sealing wall on the insulating wall; Fixing the lower body on the secondary sealing wall; Depositing a spacer on the secondary sealing wall; Securing the spacer by the flange portion by engaging an upper body having a flange portion with the lower body; A method of assembling a barrier structure of a liquefied natural gas storage tank is provided.

The spacer may be provided with a fixing hole at a position corresponding to the lower body before the spacer is stacked on the secondary sealing wall.

A stepped portion may be formed around the fixing hole of the spacer before the flange is attached to the secondary sealing wall.

The upper body may have a coupling protrusion before being coupled to the lower body.

The lower body may be formed with an insertion hole into which the coupling protrusion can be inserted before being stacked on the secondary sealing wall.

After securing the spacer on the secondary sealing wall, the primary sealing wall may be laminated on the spacer.

As described above, according to the present invention, in the liquefied natural gas storage tank, the structure of the heat insulating wall and the sealing wall and the joint structure thereof are simplified and the operation is facilitated, the reliability of the sealing is increased, A barrier structure of an improved liquefied natural gas storage tank and a method of assembling the barrier structure that can shorten the drying time of the tank by simplifying the manufacturing process can be provided.

1 is a schematic cross-sectional view of a ship equipped with a storage tank for liquefied natural gas according to the prior art,
FIG. 2 is a cross-sectional view showing a part of a storage tank of liquefied natural gas according to the prior art,
3 is a cross-sectional view of a barrier structure according to an embodiment of the present invention, which comprises a single layer of insulating walls, a secondary sealing wall and a primary sealing wall stacked on the insulating wall,
4 and 5 are a perspective view and an exploded perspective view illustrating a spacer arrangement of a barrier structure according to an embodiment of the present invention,
6 is a partial side view of a barrier structure for illustrating first fixing means for fixing a spacer on a secondary sealing wall;
FIG. 7 is a partially separated side view of the barrier structure for explaining the first fixing means of FIG. 6;
Fig. 8 is a perspective view of the engaged state of the first fixing means of Fig. 6,
Fig. 9 is a perspective view of the first fastening means of Fig. 6,
10 is a partial side view of a barrier structure for illustrating a second securing means for securing a spacer on a secondary sealing wall;
11 is a partially separated side view of the barrier structure for illustrating the second fixing means of Fig. 10, and Fig.
12 is a perspective view of the second fastening means of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

The present applicant has found that instead of interposing a secondary sealing wall between the primary insulating wall and the secondary insulating wall, the primary and secondary sealing walls are adjacent to one insulating wall having a thickness required for heat insulation Barrier structure of laminated structure was developed.

3 shows an embodiment of a barrier structure consisting of a single layer of insulating wall 110 and a secondary sealing wall 122 and a primary sealing wall 121 stacked on this insulating wall 110 . The primary sealing wall 121 and the secondary sealing wall 122 are stacked adjacent to each other so as to prevent the primary sealing wall 121 and the secondary sealing wall 122 from contacting each other, And spacers 131 and 133 are interposed between them. Spacers 131 and 133 may be made of, for example, plywood.

It is preferable that the spacers 131 and 133 are not interposed between the corrugation portions formed in the primary sealing wall 121 and the secondary sealing wall 122 and the corrugation portions. That is, the spacers 131 and 133 are preferably disposed only between the primary sealing wall and the flat plane portion of the secondary sealing wall.

The heat insulating wall 110 is a unit thermal insulating box made of, for example, a heat insulating material 113 made of polyurethane foam or the like, interposed between an upper plate 111 and a lower plate 112 made of, May be formed by arranging a plurality of planes. Any method known in the art may be used for forming the heat insulating wall.

4 shows a state in which the spacers 131 and 133 are laminated on the secondary sealing wall 122 and the state in which the spacers 131 and 133 are separated from the secondary sealing wall 122 is shown in Fig. .

As shown in Fig. 5, the spacers 131 and 133 are formed to have a flat spacer 131 having a substantially rectangular plate shape and to be disposed around the wrinkles of the primary and secondary sealing walls 121 and 122 And a groove spacer 133 having a groove. The planar spacers 131 and the groove spacers 133 are disposed on the secondary sealing wall 122 in a plurality of patterns.

The groove spacer 133 may be formed of a piece of plywood having grooves corresponding to the corrugations, or may be made of a combination of several pieces of plywood to form a groove spacer having the shape shown in the figure.

Each of the spacers, that is, the flat spacer 131 and the groove spacer 133, can be fixedly disposed on the secondary sealing wall 122 by the first and second fastening means 150 and 160. According to the present embodiment, the flat spacer 131 is fixed on the secondary sealing wall 122 by the first fixing means 150, and the flat spacer 131 is fixed to the fixing hole 135). Further, according to the present embodiment, the groove spacer 133 disposed around the anchor assembly is fixed on the secondary sealing wall 122 by the first fixing means 150 and the second fixing means 160. The second fixing means 160 fixes the spacer on the secondary sealing wall 122 by using the anchor assembly 140. To this end, the groove spacer 133 is fixed to the fixing hole 150, And an anchor hole 137 in which the first fixing means 135 and the second fixing means 160 are installed. The anchor holes 137 are also formed for attaching the primary sealing wall 121 to the anchor assembly 140, as shown in Fig.

The construction and operation of the first fixing means 150 for fixing the spacer, that is, the spacer 131 and the groove spacer 133 on the secondary sealing wall 122 will be described with reference to Figs. 6 to 9 .

In Figure 6, the first fastening means 150 is shown in engagement with a portion of the barrier structure and is shown in a separate state in Figure 7. 6 and 7, the primary sealing wall 121 constituting the barrier structure is not shown. In FIG. 8, only the first fixing means 150 is shown in the engaged state, and FIG. 9 shows the separated state.

6 to 9, the first fastening means 150 includes a lower body 151 having an approximately dish shape and an upper body 156 coupled to the lower body 151.

The lower body 151 is fixedly mounted, for example, by welding, on the secondary sealing wall 122 before the spacers 131 and 133 are stacked. The lower body 151 includes a bottom portion 152 abutting against the secondary sealing wall 122, a substantially cylindrical lower side wall 153 extending from the bottom portion 152, (Not shown). The insertion holes 154 may have a substantially rectangular shape, for example, and a plurality of the insertion holes 154 may be formed along the lower side wall 153 at regular intervals.

The upper body 156 is inserted and joined to the lower body 151 already fixed to the secondary sealing wall 122 after the spacers 131 and 133 are stacked on the secondary sealing wall 122. The upper body 156 includes a cylindrical upper side wall 157 to be inserted into the lower body 151, a flange portion 158 extending outwardly in the vertical direction from the upper edge of the upper side wall 157, And an engaging projection 159 formed on the upper side wall 157 so as to be inserted and inserted into the insertion hole 154 formed in the upper side wall 153. The engaging projections 159 are formed at the same positions and at the same positions as the insertion holes 154 formed in the lower side wall 153. The engaging projection 159 is elastically deformed while being inserted into the insertion hole 154 and after the insertion is completed, the engaging projection 159 returns to the initial state to maintain the engaged state between the lower body 151 and the upper body 156 .

The flange portion 158 of the upper body 156 is provided around the fixing hole 135 of the spacers 131 and 133 so that the flange portion 158 is engaged with the flange portion 158, A jaw portion 136 is formed.

As described above, according to the first fixing means 150, the heat insulating wall 110 and the secondary sealing wall 122 are stacked on the structure (inner wall, partition wall, etc.) constituting the hull, The spacer 131 and the spacer 133 having the fixing hole 135 formed at the position corresponding to the lower body 151 are fixed to the secondary sealing wall 151 by fixing the lower body 151 of the first fixing means 150 on the upper body 122, 133 by the flange portion 158 by engaging the upper body 156 of the first fastening means 150 with the flange portion 158 to the lower body 151. [ Can be inserted and fixed.

Although the first fixing means 150 is formed by forming the insertion hole 154 in the lower body 151 and the coupling protrusion 159 formed in the upper body 156, 150 may be modified such that a coupling protrusion is formed on the lower body 151 and an insertion hole is formed in the upper body 156. Further, other means other than the insertion hole and the coupling projection can be utilized as long as two different members can be combined.

The second fixing means 160 for fixing the spacer, that is, the groove spacer 133, on the secondary sealing wall 122 using the anchor assembly 140 (see Fig. 3) will now be described with reference to Figs. 10 to 12 Configuration and operation will be described.

In Figure 10, the second fastening means 160 is shown in engagement with a portion of the barrier structure and is shown in a separate state in Figure 11. 10 and 11, the primary sealing wall 121 constituting the barrier structure is not shown. In Fig. 12, only the second fixing means 160 is shown.

10 to 12, the second fixing means 160 includes a side wall portion 161 having a substantially annular shape and a flange portion 161 extending outwardly in a substantially vertical direction from the upper edge of the side wall portion 161. [ And an engaging protrusion 163 extending inward in a substantially vertical direction from a lower end edge of the side wall portion 161 so that the second fixing means 160 can be coupled to the anchor assembly 140. [

3, the anchor assembly 140 according to the present embodiment includes a first joint 141 to which the primary sealing wall 121 is attached and a second joint 141 to which the secondary sealing wall 122 is attached An anchor plate 143 slidably supporting the first and second joints 141 and 142 and an anchor plate 143 separating the first and second joints 141 and 142 from the anchor plate 143 And an anchor support rod 145 extending from the anchor plate 143 toward the hull. The anchor plate 143 has an anchor plate 144 attached to the anchor plate 143 and an anchor support rod 145 extending from the anchor plate 143 toward the hull.

The first and second joint portions 141 and 142 to which the primary and secondary sealing walls 121 and 122 are attached are separated from each other by the anchor plate 143 and the anchor cap 144 when a displacement is caused by thermal deformation of the LNG storage tank And can be displaced in the horizontal direction within the formed space. The first joint 141 is fixed on the second joint 142 by welding or the like and the second joint 142 is installed between the anchor plate 143 and the anchor cap 144 .

The engaging projections 163 abut the outer surface of the anchor assembly 140 to keep the position of the second securing means 160 fixed. The engaging projection 163 abuts the anchor assembly 140, particularly the first abutment 141 of the anchor assembly, when the second securing means 160 is inserted into the anchor hole 137 formed in the groove spacer 133 Thereby maintaining the engaged state between the anchor assembly 140 and the second fastening means 160. A plurality of coupling protrusions 163 may be formed at regular intervals from each other.

The flange portion 162 of the second fixing means 160 is provided around the anchor hole 137 of the groove spacer 133 so that the flange portion 162 is engaged with the flange portion 162 of the groove spacer 133, A jaw portion 138 is formed.

As described above, according to the second fixing means 160, the heat insulating wall 110 and the secondary sealing wall 122 are stacked on the structure (the inner wall, the partition wall, etc.) constituting the hull, 122 are attached to the hull and the first joint 141 of the anchor assembly 140 is exposed for attachment of the primary seal wall 121 to the exterior of the anchor assembly 140, By inserting the second fixing means 160 into the anchor hole 137 formed in the groove spacer 133 so as to fix the groove spacer 133 by the flange portion 162 of the second fixing means 160 have.

In the above embodiment of the present invention, the sealing film is made of corrugated stainless steel, for example, used in the GTT Mark-III type, but may also be made of the invar steel used in No. 96 of the GTT.

In addition, it goes without saying that the present invention is equally applicable to a liquefied natural gas storage tank installed inside the hull of a shelf as well as a liquefied natural gas storage tank installed on the land.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It should be understood that various modifications and changes may be made by those skilled in the art.

110:
121: primary sealing wall
122: secondary sealing wall
131: flat spacer
133: Home Spacer
135: Fixing hole
136, 138:
137: Anchor hole
140: anchor assembly
150: first fixing means
151: Lower body
152:
153: Lower side wall
154: insertion hole
156: upper body
157: upper side wall
158, 162: flange portion
159, 163:
160: second fixing means
161:

Claims (17)

A barrier structure of a liquefied natural gas storage tank, which is installed on an inner surface of a storage tank for storing liquefied natural gas to prevent leakage of liquefied natural gas,
An insulating wall for blocking heat transfer between the outside and the inside of the storage tank;
A secondary sealing wall laminated on the heat insulating wall;
A primary sealing wall laminated on the secondary sealing wall and directly contacting the liquefied natural gas;
Spacers interposed between said primary and secondary sealing walls to maintain spacing between said primary and secondary sealing walls;
Fixing means for fixing the spacer on the secondary sealing wall;
Wherein the liquefied natural gas storage tank is a liquefied natural gas storage tank. The method according to claim 1,
Wherein the securing means comprises a lower body fixedly attached to the secondary sealing wall and an upper body coupled to the lower body while supporting the spacer. The method of claim 2,
Wherein one of the lower body and the upper body is provided with an insertion hole and the other of the lower body and the upper body is formed with a coupling protrusion coupled to the insertion hole. The method of claim 2,
Wherein the lower body includes a bottom portion abutting against the secondary sealing wall and a cylindrical lower sidewall extending from the bottom portion, wherein a plurality of insertion holes are formed at regular intervals in the lower sidewall, Barrier structure of tank. The method of claim 2,
The upper body may include a cylindrical upper sidewall inserted into the lower body and a flange extending outwardly in a vertical direction from an upper edge of the upper sidewall and the upper sidewall may be resiliently coupled to the lower sidewall Wherein the plurality of coupling protrusions are formed at regular intervals. The method according to claim 1,
Wherein the spacer comprises a planar spacer disposed between the flat surfaces of the primary and secondary sealing walls and a groove spacer having a groove to be disposed around the corrugation of the primary and secondary sealing walls, Barrier structure of natural gas storage tanks. The method of claim 6,
The groove spacer may be formed of a piece of plywood formed with the groove portion to form a groove portion corresponding to the wrinkle portion or may be manufactured by combining a plurality of pieces of plywood to have the shape of the groove portion , Barrier structures of liquefied natural gas storage tanks. The method according to claim 1,
Wherein the spacer is not interposed between the corrugated portion and the corrugated portion respectively formed in the primary sealing wall and the secondary sealing wall and is disposed only on a flat portion between the primary sealing wall and the secondary sealing wall, Barrier structure of storage tank. The method of claim 2,
Wherein the spacer comprises a securing hole through which the lower body of the securing means can pass. The method of claim 9,
Wherein the spacer includes a stepped portion around the fixing hole where the upper body of the fixing means is caught. A liquefied natural gas storage tank having a barrier structure for preventing leakage of liquefied natural gas,
The barrier structure comprising a secondary sealing wall laminated on an insulating wall for blocking heat transfer between the outside and the interior of the storage tank, a primary sealing wall directly contacting the liquefied natural gas, A spacer interposed between the car sealing walls, and fixing means for fixing the position of the spacer,
Wherein the securing means comprises a lower body attached to the secondary sealing wall and an upper body coupled to the lower body while the spacer is sandwiched by the flange portion. A method for assembling a barrier structure of a liquefied natural gas storage tank, which is installed on an inner surface of a storage tank for storing liquefied natural gas to prevent leakage of liquefied natural gas,
Laminating an insulating wall and a secondary sealing wall on the structure forming the hull;
Fixing the lower body on the secondary sealing wall;
Depositing a spacer on the secondary sealing wall;
Securing the spacer by the flange portion by engaging an upper body having a flange portion with the lower body;
Wherein the liquefied natural gas storage tank comprises a plurality of liquefied natural gas storage tanks. The method of claim 12,
Wherein the spacer is formed with a fixing hole at a position corresponding to the lower body before being stacked on the secondary sealing wall. 14. The method of claim 13,
Wherein a flange portion is formed around the fixing hole of the spacer before being stacked on the secondary sealing wall. The method of claim 12,
And a coupling protrusion is formed on the upper body before being coupled to the lower body. 16. The method of claim 15,
Wherein the lower body is formed with an insertion hole into which the coupling protrusion can be inserted before being stacked on the secondary sealing wall. The method of claim 12,
Wherein the primary seal wall is laminated on the spacer after securing the spacer on the secondary seal wall.

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