KR100667500B1 - Lng storage tank and modules for constructing it - Google Patents

Abstract

The present invention relates to a liquefied natural gas storage tank and a method for manufacturing the same, which simplifies the tank for storing the liquefied natural gas, which is a liquid in an ultra low temperature state, shortens the assembly process, and maintains the liquid tightness. It is an object of the present invention to provide a liquefied natural gas storage tank capable of relieving stress more easily and minimizing a loss due to vaporization of liquefied natural gas. In order to achieve the above object, the liquefied natural gas storage tank according to the present invention includes a tank for loading liquefied natural gas; A primary sealing wall in direct contact with the liquefied natural gas loaded in the tank; A plurality of connecting means for mechanically connecting the tank, the primary sealing wall and the tank; The intermediate wall structure is formed between the tank and the primary sealing wall, the intermediate wall structure is composed of a corner structure is installed in the corner portion of the tank and a planar structure installed in the flat portion, the planar structure It is movable with respect to any one or more of the tank and the primary sealing wall.

LNG tanks, ships. Insulation wall, sealing wall

Description

LNG storage tank and its manufacturing module {LNG STORAGE TANK AND MODULES FOR CONSTRUCTING IT}

1 and 2 are a cross-sectional view and a perspective view showing a conventional membrane type liquefied natural gas storage tank GTT NO 96-2 type.

3 and 4 are a cross-sectional view and a perspective view showing a GTT Mark III type of a conventional membrane type liquefied natural gas storage tank.

5 is a cross-sectional view showing a corner structure of a conventional LNG storage tank.

Figure 6 (a) and (b) is a cross-sectional view showing the internal structure of the corner structure constituting the liquefied natural gas storage tank according to an embodiment of the present invention.

Figure 7 is a whole perspective view showing the connection of the corner structure of the liquefied natural gas storage tank installed in the ship according to the present invention.

Figure 8 is a partially enlarged cross-sectional perspective view showing a corner structure of the liquefied natural gas storage tank installed in the vessel according to an embodiment of the present invention.

9 to 23 are perspective views sequentially illustrating a process of assembling the liquefied natural gas storage tank in the hull interior space according to an embodiment of the present invention.

Figure 24 is an enlarged cross-sectional view showing a means for fastening the secondary sealing wall in the LNG storage tank according to an embodiment of the present invention.

25 is an enlarged perspective view showing a means for fastening the secondary sealing walls in the LNG storage tank according to an embodiment of the present invention.

Figure 26 (a), (b) is a partial cross-sectional perspective view showing an enlarged coupling relationship of the anchor structure in the liquefied natural gas storage tank according to an embodiment of the present invention.

27 is a partially cutaway perspective view of a liquefied natural gas storage tank according to another embodiment of the present invention.

28 to 36 are perspective views sequentially illustrating a process of assembling the liquefied natural gas storage tank according to another embodiment of the present invention in the hull interior space.

37 and 38 are enlarged cross-sectional views illustrating a state diagram in which secondary sealing walls are fastened to each other in a LNG storage tank according to another embodiment of the present invention.

39 is a cross-sectional view of a ship equipped with a liquefied natural gas storage tank according to the present invention.

40 is a partially enlarged view of the thermal insulation system in FIG. 39.

41 is a view showing a connection state of the secondary sealing wall in the anchor portion.

<Description of the symbols for the main parts of the drawings>

50: corner support plate 51: corner portion primary insulation wall

52: corner secondary sealing wall 53: corner secondary insulating wall

54, 56 plate 57, 58: heat insulating material

60: lower support rod 61: rod support cap

70: upper support rod 80, 81: corner boundary jaw

90: connection reinforcement table 100: corner structure

101: holder 109: stud pin

110: anchor base plate 111: anchor lower plate

113: anchor portion secondary insulating wall 114: anchor portion secondary sealing wall

115: pleat 119: anchor upper cap

150: anchor structure 200: planar structure

201: lower plate 202: planar secondary insulation wall

203: plane portion secondary sealing wall 204: plane portion primary insulation wall

205: top plate 211: heat insulating material

212: upper fixing plate 213: lower fixing plate

214: fixing bolt 250: primary sealing wall

251: wrinkles

The present invention relates to a liquefied natural gas storage tank installed inside a structure of a ship, a land tank, a vehicle, and the like, and more particularly, to simplify a structure of a tank for storing liquefied natural gas, which is a liquid in an ultra low temperature state. The present invention relates to a liquefied natural gas storage tank and a method of manufacturing the same, which can shorten the assembly process and at the same time maintain the liquid tightness while releasing stress caused by mechanical deformation more easily.

In general, liquefied natural gas (Liquefied Natural Gas, LNG) is a liquefied natural gas, one of the fossil fuels, liquefied natural gas storage tank is a land-type storage tank that is installed on the ground or buried in the ground depending on the installation location or It is classified into a mobile storage tank installed in a vehicle or a vehicle.

The above-described liquefied natural gas has a risk of explosion when exposed to an impact, and is stored in a cryogenic state. The storage tank storing the liquefied natural gas has a structure in which impact resistance and liquid tightness are firmly maintained. Such storage tanks are somewhat different in that the structures of liquefied natural gas storage tanks installed in automobiles and ships with flows must be prepared against the mechanical stress caused by the flow, compared to land storage tanks with little flow. There is. However, since the liquefied natural gas storage tank installed in the vessel provided with a countermeasure against mechanical stress can be used in the land-type storage tank, of course, the present invention describes the structure of the liquefied natural gas storage tank installed in the vessel as an example.

First, liquefied natural gas (Liquefied Natural Gas, LNG) storage tanks installed in the LNG carrier can be divided into independent tank (Membrane Type). This is a classification according to whether the load of the cargo directly acts on the insulation, the details are as follows.

In Table 1, aka GTT NO 96-2 type and GTT Mark III type were renamed Gaz Transport (GT) and Technigaz (TGZ) in 1995 as GTT (Gaztransport & Technigaz), respectively, GT type was GTT NO 96 -2 type, TGZ type is renamed GTT Mark III type.

GT and TGZ tank structures described above are described in US Pat.

GTT's membrane type LNG carriers are equipped with a cofferdam in order to directly insulate the insulation and the hull and to avoid the risk of mechanical and thermal characteristics between the cargo tank and the cargo tank. In order to prevent low temperature brittleness of the inner hull of the cofferdam, it should be maintained at + 5 ° C or higher. For this purpose, heating means such as heating coils are generally installed to use a heat source such as steam or hot water. Insulation construction is completed by installing the chiefs in the hull first, then installing the chiefs and the insulation boxes, membranes and other materials completed on land. In the case of older tanks, the membrane method has a longer post-launch time compared to a longer working period before launch.

As shown in FIGS. 1 and 2, the NO 96-2 type of GTT's membrane type uses Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm, and a primary sealing wall 10. And the secondary sealing wall 15 has almost the same degree of liquid tightness and strength, so that the secondary sealing wall 15 alone can safely support the cargo for a considerable period of time upon leakage of the primary sealing wall 10. Also, the sealing walls 10 and 15 of GTT NO 96-2 type have a straight membrane, so welding is easier than that of Mark III type membrane, and the automation rate is high, but the overall welding site has a long GTT NO 96-2 type. .

In addition, the biggest difference between the existing GT type and the currently adopted GTT NO 96-2 type is the use of the Double Couple (17) instead of the U-shaped bar supporting the insulation box (insulation walls, 11, 16). It is. The functions of the main parts of the heat dissipation section of the storage tank of GTT NO 96-2 type LNG carrier are shown in Table 2.

On the other hand, Mark III type of GTT, as shown in Figure 3 and 4, is a stainless steel membrane (Membrane) with a 1.2 mm thick corrugation to the primary sealing wall 20, the shrinkage due to low temperature is Absorbed from the pleats, little stress is generated in the membrane. In addition, polyurethane foam (PUF), glass wool, triplex, and the like are used as the material of the insulating walls 21 and 26. Mark Ⅲ type is equipped with the primary and secondary insulation walls (Insulation) (21, 26) onshore and is integrally mounted, so that the box-shaped primary and secondary insulation walls (21, 26) must be installed, respectively GTT NO Construction is relatively easy compared to 96-2 type.

The function of the main part of the heat dissipation section of the LNG carrier storage tank of the GTT Mark III type is shown in Table 3 below.

A part that occupies an important part of the GTT NO 96-2 type storage tank and the GTT Mark III type storage tank having the above structure is the structure of the corner part.

Here, the corner portion (edge portion) in the LNG storage tank is a region in which loads due to thermal deformation of each sealing wall (membrane) constituting the storage tank act asymmetrically, and is stored by dispersing such an asymmetrical load. It must be constructed structurally to relieve stress from the tank.

As a recent technology regarding a corner portion (edge portion) in such an LNG storage tank, "Liquid-sealing tank with improved edge structure as a tank installed in a support structure of a ship" disclosed in Korean Patent Laid-Open Publication No. KR2000-0011347. There is.

As shown in FIG. 5, the corner structure disclosed in KR2000-0011347 is used to fix the prefabricated composite girder 30 at a 90 degree angle formed by the hull inner surface 1 and the transverse bulkhead 2. The composite girder 30 is composed of a heat insulating material 40 incorporating a reinforcing web 39 (dashed line portion) formed at a predetermined interval in the rigid W-shaped metal body 31.

The prefabricated composite girder 30 of this type is fixed to the hull inner surface 1 and the transverse bulkhead 2 via the polymer resin 34, respectively, and the bifurcation is the transverse bulkhead 2 And fastening means 32 and 33 respectively supported by the inner surface 1 of the double hull, to be mechanically fastened to the bearing structure of the hull.

In addition, the bottom of the prefabricated composite girder 30 is formed with an inclined surface 42 such that the drainage space 41 is formed at an angle of 90 degrees between the hull inner surface 1 and the transverse bulkhead 2.

The technique of assembling the corner portion of the LNG storage tank using the prefabricated composite girder 30 is a relatively simple structure to improve the resistance of the sealing wall due to mechanical impact without damaging the installation cost and the coating of the double bulkhead. Although effective, the prefabricated composite girder 30, which is a basic unit constituting the corner portion of the storage tank, is made of a rigid metal body 31, and crosses the inner surface 1 of the hull of the metal body 31. Assembly is not simple because it is manually fixed by mechanical fixing means 32 and 33 (bolts-nuts) fixed to the partition 2.

The corner structure of the membrane type LNG storage tank described above is a structure in which the prefabricated composite girder 30, which is a basic unit constituting the corner portion of the storage tank described above, is firmly fixed to the hull inner surface 1 and the transverse bulkhead 2. As a result, partial stress may be generated in the hull during operation of the hull or by waves, and thus stress concentration occurs in the corner portion.

As a result, efforts have been made to improve stress concentration over decades, and further improvement is needed. In addition, continuous improvements are being made to reduce the boil of gas (BOG), the structure simplification, and the simplification of the manufacturing process, which are losses due to vaporization of cryogenic liquid LNG.

The membrane type liquefied natural gas storage tank described above is to reduce the BOG (boil of gas) which is a loss due to the vaporization of liquefied natural gas which is a cryogenic liquid yet, to simplify the structure of the complex insulation and sealing walls, and to simplify the manufacturing process. Although efforts have been made over the decades in terms of reducing the tank drying period, stress relief at the corners of the tank and sealing walls, there is still a need for further improvement.

Accordingly, the present invention is to invent the membrane-type LNG storage tank having a new structure different from the conventional membrane-type LNG gas storage tank to improve the various problems.

In addition, the planar structure of the insulation system installed on the bottom surface of the storage tank is a plurality of structures, each planar structure is fixed by the anchor structure. On the other hand, the insulation wall is deformed in the hull due to the wave or the sloshing of the cargo during the movement of the ship, thereby generating a mechanical stress, and the continuous technical development to solve this has been made.

The present invention proposes a membrane-type LNG storage tank having a new structure different from the conventional membrane-type LNG storage tank, simplifies the assembly structure and manufacturing process to shorten the drying period of the tank, as well as liquefied natural gas stored in the storage tank It is an object of the present invention to provide a liquefied natural gas storage tank having a new structure and a method of manufacturing the same in order to more efficiently solve the thermal / mechanical stress generated from the storage and discharge of the gas.

In order to achieve the above object, according to an embodiment of the present invention,

A tank for loading liquefied natural gas;

A primary sealing wall in direct contact with the liquefied natural gas loaded in the tank;

A plurality of connecting means for mechanically connecting the tank, the primary sealing wall and the tank;

It consists of an intermediate wall structure located between the tank and the primary sealing wall,

The intermediate wall structure is provided with a storage tank of liquefied natural gas, characterized in that the sliding movement with respect to any one or more of the tank and the primary sealing wall.

The intermediate wall structure is preferably movable in a horizontal direction with respect to any one or more of the tank and the primary sealing wall. Here, the tank refers to the structure before the insulation wall and the sealing wall are installed, and in some cases, it means that they are installed. In addition, the intermediate wall structure has a plurality of holes, characterized in that the connecting means passes through the hole.

According to another embodiment of the present invention, the intermediate wall structure includes a primary insulating wall in contact with the primary sealing wall;

A secondary heat insulation wall in contact with the tank;

There is provided a storage tank of liquefied natural gas comprising a secondary sealing wall located between the primary and secondary insulating walls. The secondary sealing wall is characterized in that the liquid-tight connection between the intermediate wall structure and the connecting means.

In addition, the intermediate wall structure may be composed of a plurality of modules, the module is composed of a plurality of planar structure located in the planar portion of the tank and a plurality of corner structure located in the corner portion. The module is preferably formed of a preassembly. The corner structure is adhesively attached to the tank and is movable only with respect to the primary sealing wall, and the planar structure is preferably movable with respect to the primary sealing wall and the tank. The storage tank of the liquefied natural gas may be installed in the ship. An upper end of the connecting means may be connected to the primary sealing wall by welding.

According to another embodiment of the present invention, the insulating module is used for the storage tank of liquefied natural gas, the module is protruded in order to facilitate the assembly between adjacent modules, and the storage tank of the liquefied natural gas And installed inside the storage tank to allow sliding movement with respect to any one or more of the storage tank and the primary sealing wall between the primary sealing wall in direct contact with the liquefied natural gas. A module for manufacturing a liquefied natural gas storage tank is provided. The module includes a primary insulating wall; A secondary sealing wall bonded to the lower portion of the primary insulating wall with an adhesive; It is preferable that the secondary insulating wall is composed of a secondary heat insulating wall is bonded to the lower portion of the adhesive. In addition, the module forms a quadrangular pillar, one or more corner portions may be formed in a stepped shape in which a portion is cut, or the thermal insulation module may form an L shape. The heat insulating wall is preferably made of polyurethane foam. In addition, the module and the primary insulating wall;

delete

An upper plate attached to an upper portion of the primary insulating wall;

A secondary sealing wall attached to a lower portion of the primary insulating wall;

A secondary insulating wall attached to a lower portion of the secondary sealing wall;

Consists of a lower plate attached to the lower portion of the secondary insulating wall,

The lower plate is provided with a module for manufacturing a storage tank of liquefied natural gas, characterized in that extending from one or more sides of the secondary insulating wall to form a flange. It is preferable that the primary or secondary heat insulating wall and the sealing wall are bonded to each other with an adhesive. In addition, the secondary sealing wall preferably protrudes from at least one side of the primary and secondary insulating walls. In addition, the secondary sealing wall is liquid-tightly connected between the modules.

According to another embodiment of the present invention, it comprises two consecutive sealing walls and two insulating walls, wherein the primary sealing walls of the sealing walls are in contact with the liquefied natural gas stored in the storage tank, the lower part 1 In the storage tank of liquefied natural gas arranged in the order of the primary insulation wall, the secondary sealing wall and the secondary insulation wall,

The primary sealing wall is supported by an anchor portion mechanically coupled to the tank bottom surface,

The primary insulating wall, the secondary sealing wall and the secondary insulating wall are composed of planar structures in which the upper and lower surfaces thereof are coupled to the planar portion of the tank, and each of the planar structures is somewhat between the primary sealing wall and the tank bottom surface. It is installed to be slidable. However, although the anchor portion and the heat insulation wall are equally received with respect to the load of cargo in the tank, the heat insulation walls are slightly slid with respect to the primary seal wall because the primary sealing wall is welded and supported only at the anchor portion. When the structure in which the tank is installed is a double hull vessel, the "bottom surface" (or inner surface) of the tank means the inner wall of the side and the lower surface of the hull and the upper wall and the transverse bulkhead of the tank.

Here, in the case of a ship, when a torsion occurs in the hull due to a wave or the like in the case of a ship and the bending occurs in the hull due to this twist, the insulation system of the tank consisting of the primary and secondary insulation wall is in contact with the inner wall of the hull Flexural stress is also generated in the insulation system, which means that the insulation wall units such as the planar structure described below can move somewhat laterally without destroying the insulation system. The heat insulation wall unit refers to a primary heat insulation wall, a secondary sealing wall adhered thereto, and a secondary heat insulation wall unit adhered thereto mainly formed of a pre-assembled body in the present invention.

Preferably, the primary heat insulating wall and the secondary heat insulating wall are adhered to each of the upper and lower surfaces of the secondary sealing wall by an adhesive, and formed as a pre-assembly can be a unit of assembly during the tank manufacturing. In the present invention, the prefabricated assembly includes a corner structure installed at the corner of the tank and a planar structure installed at the flat bottom of the tank. The secondary insulating wall may include a polyurethane foam insulation and a plywood plate bonded to the lower surface thereof. In addition, the primary insulation wall may include a polyurethane foam insulation and a plywood plate bonded to the upper and lower surfaces thereof. In addition, the material of the secondary sealing wall may be an aluminum sheet or a flexible sheet (Triplex, preferably rigid triplex).

On the other hand, the secondary sealing wall is protruded from the side of the primary insulation wall and the secondary insulation wall when assembling the units of the pre-assembly (planar structure), the secondary sealing wall of the adjacent pre-assembly or the secondary sealing wall of the anchor portion Interconnected with Here, the shape or material of the primary sealing wall is not particularly limited, and may be made of stainless steel as described in the patents disclosed by the present applicant or the patents disclosed by TGZ, which may be formed wrinkles. have.

In addition, the side spaces formed between the secondary insulating wall may be filled with a heat insulating material of polyurethane foam material. On the other hand, the side spaces formed between the primary insulating wall may be filled with a heat insulating material of glass wool (Glass Wool) material.

In addition, the secondary sealing wall extends into the space portion (that is, between the insulating wall side) formed by the heat insulating wall, the end of the secondary sealing wall is connected to the space portion by the upper fixing plate and the lower fixing plate, Engagement surfaces of the upper fixing plate and the lower fixing plate may include a groove formed to be inserted into the end of the secondary sealing wall. Here, the groove portion may be formed to be bent, and the combination of the lower fixing plate and the upper fixing plate has some bends in the longitudinal direction thereof, and has some lengths to absorb the stress during shrinkage of the sealing wall by cooling. can do.

According to another embodiment, the secondary sealing wall is extended to the side space portion formed by the resin material is applied to the upper surface and the lower surface and the adjacent heat insulating wall, the space portion in contact with the end of the secondary sealing wall And an upper connection member and a lower connection member to be coupled to each other, and the concave-convex portions formed on the coupling surfaces of the upper heat-resistant member and the lower connection member are pressed to compress the resin material applied to the upper and lower surfaces of the secondary sealing wall. It is preferable to combine. This coupling method further improves the sealing characteristics of the secondary sealing wall.

According to another embodiment of the present invention with respect to the connection of the secondary sealing wall, a corner structure coupled to an edge portion inside the tank, a planar structure slidably positioned on a plane inside the tank, and the tank It may include an anchor structure coupled to the planar structure to the inside of the tank.

Here, the planar structure is formed on the upper surface and the planar secondary insulation wall is installed at the same height as the corner secondary insulation wall while the one side is fixed by the corner boundary jaw that the corner structure is fixed, It is preferable to be made of a pre-assembly consisting of the flat portion secondary sealing wall and the flat portion primary insulating wall formed on the upper surface thereof.

In addition, the anchor structure is an anchor support rod is fixed to the anchor lower plate that is mechanically fixed to the corner portion where the planar structure meets, the center is inserted into the anchor support rod fixed to install the same height as the second insulating wall Anchor part secondary heat insulating wall and anchor portion secondary sealing wall which is inserted into the anchor supporting rod and fixed to the upper surface of the anchor part secondary heat insulating wall, mechanically fastened to the neighboring flat portion secondary sealing wall And an anchor portion primary heat insulation wall fixed to an anchor portion secondary sealing wall upper surface by being inserted into the anchor support rod, and an upper portion fixed to an upper end portion of the anchor support rod which is an upper center portion of the anchor portion primary insulation wall. Caps may be included.

In the above structure, the anchor lower plate is configured to fix the secondary insulating wall lower plate of the preassembly unit structure adjacent thereto with the inner surface of the tank. In addition, the anchor portion secondary sealing wall may include a wrinkle portion formed on the outer peripheral surface portion. Here, the anchor portion secondary sealing wall protrudes from the cross section of the anchor portion primary insulating wall is connected to the secondary sealing wall of the adjacent preassembly. In addition, the anchor portion primary insulation wall and the anchor portion secondary insulation wall may be adhered to each of the upper and lower surfaces of the anchor portion secondary sealing wall by an adhesive.

On the other hand, the anchor secondary insulating wall may include a polyurethane foam insulation and a plywood plate bonded to the upper surface thereof. In addition, the anchor portion primary heat insulating wall may include a polyurethane foam insulation and a plywood plate bonded to the upper and lower surfaces thereof. The plywood plate bonded to the lower end of the secondary insulating wall of the pre-assembly is fixed to the tank bottom surface by the anchor lower plate protruding its side portion to constitute the anchor portion. The fixing prevents the upward movement of the insulation walls and is fixed horizontally, but some movement is possible.

On the other hand, the corner structure is a corner portion secondary heat insulating wall formed in the L shape so as to interview each of the corner points where the surface formed in the tank meets, and the corner portion secondary sealing wall formed on the upper surface thereof and the upper surface thereof Corner corners formed on the inner surface of the tank, each formed on the inner surface of the tank is formed of a pre-assembled corner portion is further formed to support the load of the storage tank on the corner portion of the primary heat insulating wall and the upper portion of the corner primary heat insulating wall It can be fixed by the secondary boundary jaw.

The corner support plate may be installed to be somewhat slidably movable to allow shrinkage and extension by heat. In addition, the corner portion primary insulation wall and the secondary insulation wall may be bonded to each of the upper and lower surfaces of the secondary sealing wall by an adhesive. In addition, the primary insulation wall, the secondary insulation wall and the corner support plate may be manufactured as a preassembly.

On the other hand, the corner pre-assembly (corner structure) may be fixed by the corner boundary jaw formed on the inner surface of the tank, respectively. In addition, the secondary sealing wall may be formed to protrude from the side of the primary insulating wall and the secondary insulating wall. In addition, a plate material is formed on the lower surfaces of the primary heat insulating wall and the secondary heat insulating wall, and the plate material is formed so that the end portion thereof protrudes from the heat insulating material, and is fixed to the tank bottom surface by the stator at the boundary jaw. In addition, the lower surface of the secondary insulating wall is preferably bonded to the tank wall surface with an adhesive.

In addition, the secondary insulation wall and the primary insulation wall of the corner portion is connected to connect the upper end of the lower support rod protruding through the secondary insulation wall and the lower end of the upper support rod penetrating the primary insulation wall connection It can be mechanically coupled by a reinforcement.

In addition, the lower support rod may be inserted into and fixed to a rod support cap fixed to the lower surface of the secondary insulation wall to penetrate the secondary insulation wall, and then an upper end thereof may be fixed to the connecting reinforcement bar. In addition, the upper support rod is fixed to the lower portion of the primary heat insulation wall while being inserted and fixed to the rod support cap fixed to the connecting reinforcement can support the corner support plate through the primary heat insulation wall. This supporting method is preferably joined and supported by welding. The primary sealing wall is positioned on the corner support plate, and the primary sealing wall and the corner support plate are joined by welding. By this structure, the primary sealing wall of the corner portion is stably supported by the lower support rod coupled to the tank bottom, the upper support rod coupled to the lower support rod, and the corner support plate coupled to the upper support rod. In addition, the corner support plate is composed of a rather thick thick plate can be stably supporting the primary sealing wall of the corner portion asymmetric stress occurs. In addition, the corner support plate is weakly coupled directly to the primary heat insulation wall of the corner portion, so that some sliding is possible with respect to the primary heat insulation wall. Accordingly, the corner support plate and the corner support plate and the primary sealing wall are changed in temperature. It is possible to overcome the mechanical stress due to the difference in expansion rate.

According to another embodiment of the present invention, the anchor structure is an anchor support rod is fixed to the anchor lower plate that is mechanically fixed to the corner portion where the planar structure meets, the center portion is fixed to the anchor support rod is inserted into the plane portion 2 Anchor part secondary heat insulating wall installed at the same height as the primary heat insulating wall, and a central portion is inserted into the anchor support rod fixed to the upper surface of the anchor part secondary heat insulating wall, mechanically adjacent to the neighboring flat portion secondary sealing wall Anchor part secondary sealing wall to be fastened, Anchor part primary heat insulation wall is inserted into the anchor support rod is fixed to the anchor part secondary sealing wall upper surface, and the upper center of the anchor part primary heat insulation wall It characterized in that it comprises an upper cap fixed to the upper end of the anchor support rod.

The anchor lower plate serves to fix the lower insulation wall lower plate of the unit structure adjacent thereto with the tank inner surface. The anchor portion secondary sealing wall preferably includes a pleat portion on the outer circumferential surface portion. In addition, the anchor portion primary insulation wall and the anchor portion secondary insulation wall is preferably bonded to the upper and lower surfaces of the anchor portion secondary sealing wall, respectively, by an adhesive.

As another embodiment of the anchor portion, the anchor structure is installed on the bottom surface and the left and right partitions of the space formed in the tank at regular intervals and anchor anchor plate for fixing the anchor base plate with a rod support cap formed with a fastening hole, An anchor support rod fixed perpendicular to the rod support cap, an anchor portion secondary heat insulation wall in which a center portion is inserted and fixed to the anchor support rod, and fixed to an upper surface of the anchor portion secondary heat insulation wall, Anchor part secondary sealing wall to which the center is inserted and fixed, Anchor part primary heat insulating wall fixed to the upper surface of the anchor part secondary sealing wall and inserted into the anchor support rod and fixed to the upper end of the anchor support rod It is fixed and fixed to the upper cap for fixing the anchor portion primary insulation wall, and the upper side of the primary insulation wall side and the secondary sealing wall disposed adjacent, and the anchor portion primary insulation wall It is characterized in that it comprises a planar connection heat insulating wall coupled to be spaced apart a predetermined distance and fixed to the upper portion of the end of the neighboring secondary sealing wall and the anchor portion secondary sealing wall. The planar connection insulating wall is fixed to a secondary sealing wall upper surface fixed to the upper side of each of the primary insulating wall adjacently disposed and the secondary insulating material adjacent, the planar connecting insulating wall is the flat portion of the lower portion It is preferable that the secondary sealing wall and the anchor portion are fixed by the secondary sealing wall and the adhesive. Insulating material is filled in the space portion between the planar connection insulating wall and the anchor primary insulating wall. The planar connection insulating wall also serves to fix the secondary insulating wall at the edge thereof.

The method for manufacturing a liquefied natural gas storage tank according to the present invention includes two continuous sealing walls and two heat insulating walls, wherein the first sealing wall of the sealing walls contacts the liquefied natural gas stored in the storage tank, In the method for manufacturing a storage tank arranged in the order of the first heat insulating wall, the second sealing wall and the second heat insulating wall in the lower portion, each of the corners formed in the tank to form a boundary jaw, respectively, Attaching and fixing the anchor base plate at a predetermined interval, and attaching a corner structure pre-assembled with a secondary insulation wall, a secondary sealing wall, a primary insulation wall and a corner support plate on the basis of the formed corner boundary jaw. Fixing the fixed corner structure to the corner boundary jaw as a fixing stand, and fixing the anchor lower plate to the upper portion of the anchor base plate and vertically fixing the anchor support rod to the center portion. And a step of inserting and fixing one side of the flat structure pre-assembled with the second heat insulating wall, the second sealing wall, and the first heat insulating wall to one side of the fixing table to which the corner structure is fixed, and the other edge portion of the flat structure to the anchor. Inserting and fixing the space portion formed by the base plate and the anchor lower plate, and filling the space formed by the secondary insulation wall of the corner structure and the planar structure with a heat insulating material, and simultaneously insulating the anchor portion on the anchor support rod. Inserting a wall and an anchor secondary sealing wall, fixing the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto, and fixing the secondary sealing wall of the planar structure to each other; At the same time, mutually fixing the secondary sealing wall and the anchor portion secondary sealing wall adjacent to the planar structure, and inserting the anchor portion primary insulating wall to the anchor support rod Well, attaching and fixing the anchor top plate and the anchor insulation plate, and attaching and fixing the anchor upper cap to the end of the anchor support rod to complete the assembly of the anchor structure, and the corner structure, the planar structure and the anchor structure to form the primary Filling the interspace portion of the insulating wall with a heat insulating material, and the step of attaching and fixing the primary sealing wall having a corrugated portion on the upper surface of the corner structure, planar structure and anchor structure.

Fixing the anchor lower plate on the anchor base plate and vertically fixing the anchor support rod in the center is the anchor support rod bolted to the rod support cap fixed to the center of the anchor lower plate bolted to the anchor base plate Can be fixed.

Filling the space formed by the secondary insulating wall of the corner structure and the planar structure with a heat insulating material may be filled with polyurethane foam as a heat insulating material.

Further, the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto are fixed, and the secondary sealing wall of the planar structure is mutually fixed, and adjacent to the secondary sealing wall of the planar structure. The fixing of the anchor portion secondary sealing wall may be fixed by bolting the lower fixing plate positioned below the secondary sealing wall and the upper fixing plate positioned to face the upper surface thereof. Here, the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto are fixed, and the secondary sealing wall of the planar structure is fixed to each other and at the same time adjacent to the secondary sealing wall of the planar structure. The fixing of the anchor portion secondary sealing wall to each other may be fixed in a curved shape by a curved portion formed on the lower fixing plate for bolting the secondary sealing wall and the upper fixing plate positioned to face the upper surface thereof.

The tank for LNG according to the present invention described above, a liquefied natural gas storage tank installed in a car, a ship with a flow of cargo, a land-type tank with little flow, and the like, the tank according to the present invention is the ship, It can be installed in a land tank, a vehicle, or the like.

In addition, the present invention simplifies the structure of the anchor portion connecting the planar structure of the storage tank installed inside the ship for transporting the liquid liquefied natural gas of the cryogenic state, while shortening the assembly process, the connection of the adjacent planar structure By binding more, the liquid-tightness of an anchor part is maintained firmly. In addition, in the case where the torsion occurs in the ship hull due to waves during the voyage of the ship, in the insulation system according to the present invention, the primary sealing wall is directly connected to the anchor portion and the direct connection with the insulation walls is weak, so that the insulation walls are connected to the primary sealing wall. Some sliding is possible with respect to the torsion of the hull so that the breakage of the insulation system does not occur.

In addition, the present invention can simplify the corner structure of the tank installed inside the tank for storing the liquid liquefied natural gas of the ultra-low temperature state, shorten the assembly process, and at the same time can support the corner portion while maintaining the liquid tightness of the corner portion. By installing the thick plate material which has the advantage that it is possible to more easily solve the stress due to the mechanical / thermal contraction and expansion of the storage tank to provide a highly reliable ship.

In addition, the present invention further improves the coupling structure of the secondary sealing wall around the anchor portion by the coupling between the flat connection insulating wall and the secondary sealing wall beneath the adhesive, and the coupling structure of the vertical connecting members. There is an effect that the liquid tightness and safety are further increased.

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

The present invention is a liquefied natural gas storage tank, and stores the liquefied natural gas in a high pressure, cryogenic state. To this end, the liquefied natural gas storage tank has a structure in which impact resistance and liquid tightness are maintained firmly.

Liquefied natural gas storage tanks installed in automobiles and ships with cargo flow are different in that they have to be prepared for mechanical stress caused by the flow of cargo, compared to land tanks with little flow. However, the liquefied natural gas storage tank installed in the vessel provided with a countermeasure against mechanical stress can of course also be used in a land-type tank, the present specification describes the structure of the liquefied natural gas storage tank installed in the vessel as an example.

39 is a cross sectional view of an exemplary vessel 3900 with an LNG tank installed in accordance with one embodiment of the present invention. The ship 3900 consists of a double hull of an outer wall 3901 and an inner wall 3903 forming the outer shape of the ship. The inner wall and outer wall of the hull are connected by 3905 and are integrally formed. In some cases, the interior wall 3903 may not be present.

In addition, the upper portion of the vessel 3900 may be formed of a single layer deck different from that shown in FIG. The interior of the interior wall 3903 may be divided by one or more partitions 3907. The partition 3907 may form a cofferdam as is known in conventional LNG.

Each interior space 3911 may constitute a tank for loading cryogenic liquids, such as liquefied natural gas. As an example, a conceptual diagram in which a tank is installed in the second space from the left side of the ship 3900 will be described. The primary sealing wall 250 is a sealing wall for primarily liquid-tightening LNG. The first sealing wall 250 is in contact with the LNG 3913, and a corrugation part may be formed to cope with a temperature change according to the loading of the cryogenic LNG as is known in the art. The primary sealing wall 250 is connected to the inner wall 3903 (or partition 3907) of the ship by a plurality of anchor structures or connecting means 3915. Thus, the primary sealing wall 250 is not free to move relative to the hull.

An intermediate wall structure 3917 is located between the primary sealing wall 250 and the hull inner wall 3903 constituting the tank. Intermediate wall structure 3917 (200a, 200b) is located between the inner bulkhead or inner wall of the hull and the primary sealing wall 250, which is composed of modules, the corner structure 100 located in the corner portion, the planar portion 200 Is made of.

Figure 39 is an enlarged view of these modules than in the actual LNG tank to facilitate understanding. Each intermediate wall structure 3917 is actually quite large and interconnected.

FIG. 40 is an enlarged view of the circle 3923 shown in FIG. 39. In the illustrated example, the intermediate wall structure 3917 (planar structures 200a, 200b, and corner structure 100) includes primary insulating walls 204, 51, secondary insulating walls 202, 53, and secondary sealing walls 203, 52. Each intermediate wall structure may have one or more other functional layers. According to an embodiment of the present invention, the contact surfaces of the sealing walls and the heat insulating walls of the unit modules 200 and 100 of the intermediate wall structure 3917 are bonded to each other to form an integral unit. Further, flanges are formed at lower ends of the secondary insulating walls 202 and 52 of the lower part of the intermediate wall structure 3917. Usually, the secondary insulation wall is composed of an insulating material PUF and a plate attached to the bottom thereof, which is formed larger than PUF (polyurethane foam) to form a flange. The primary insulating wall consists of a PUF and a plate attached to the top with an adhesive.

In the illustrated example, each anchor structure 3915 has an anchor support rod 112a, 112b, a lower fixing member 113a, 113b, a secondary sealing wall 3933, a primary insulating wall (not shown) filled in the upper spaces 3929, 3931. One end of the anchor support rods 112a, 112b is connected to the primary sealing wall 250 and the other end is connected to the hull inner wall 3903. The connection relationship of such an anchor structure will be described in detail in other examples below. The anchor structure 3915 connects the hull inner wall or partition wall forming the tank with the primary sealing wall 250.

In addition, the anchor structure 3915 is located at the connection points of the neighboring intermediate wall structure modules 100, 200a, 200b to interconnect them and fix the intermediate wall structure to the hull inner wall or the partition wall forming the tank. In another embodiment, the corner structure and the planar structure among the intermediate wall structures may be fixed to the hull inner wall or the partition wall by means other than the anchor structure. This will be described in detail below. Alternatively, the anchor structure 3915 may be located in a hole formed in the wall of the intermediate wall structure formed as a single body.

The fixing members 113a and 113b of the anchor structure 3915 are installed around the anchor support rod 112. The spaces 3923 and 3931 are filled with an insulating material such as PUF. Grooves are formed in the lower portions of the fixing members 113a and 113b, and the flanges 3925 protruding from the lower portions of the secondary insulating walls 202 and 52 closely adhere to the tank. Due to such a structure, the planar structure 200 in the intermediate wall structure 3917 may move somewhat horizontally with respect to the primary sealing wall at the lower portion of the primary sealing wall 250, but the movement in the vertical direction is limited. Some space may exist between the lower groove 3927 of the fixing member 113a and the flange 3925 of the secondary insulating wall 202, and there may be some space between the fixing member 113a and the secondary insulating wall 202. Horizontal movement is possible. Of course, in FIG. 40, the planar structure 200a may be horizontally moved in the front and rear directions (the vertical direction on the left and right sides). Meanwhile, the corner structure 100 of the intermediate wall structure 3917 is fixed to the inner wall and the partition wall of the hull by adhesive bonding to the surface contacting with the tank, and is not free to move, except that the primary sealing wall 250 of the upper portion is formed on the corner structure 100. Some movement is possible with respect to it. Of course, although the primary sealing wall 250 is connected to the hull by the anchor structure, even if the primary sealing wall is welded to the upper part of the anchor structure, if the connection of the lower part of the anchor structure and the hull is connected to allow some movement, not welding. The primary sealing wall will allow some movement relative to the corner structure (or hull). Specific examples thereof are described in other examples below.

In FIG. 40, secondary sealing walls 52 and 203 are intermediately connected to intermediate sealing structures 100 and 200, as shown in FIG. 41, with the secondary sealing walls in the anchor structure. In addition, the plurality of modules 100 and 200 mutually sealing the secondary sealing wall.

Anchor support rod 112a of anchor structure 3915 secures the secondary sealing wall 3933 of the anchor structure by means of a suitable engagement member, two nuts 3936, 3937 in the embodiment of FIG. The secondary sealing walls 52 and 203 of the adjacent intermediate wall structure are liquid-tightly connected by a suitable connecting member 212 and a screw 214. The contact surface of the connecting member 212, which is a secondary sealing wall, may be coated with an adhesive to increase liquid-tightness. In addition, the bent portion 3935 may be formed on the upper and lower joint surfaces of the opening member 212 to increase the liquid-tightness. A pleat 115 is formed around the edge of the secondary sealing wall 3933 of the anchor structure 3915 to absorb the stretching or condensation stress of the secondary sealing wall generated when the adjacent planar structure moves horizontally.

In addition, the connection between the secondary sealing walls by the connecting member 212 is equally applicable to the connection between the sealing walls between the adjacent planar structures, the connection between the planar structure and the corner structure.

According to another embodiment of the present invention, the liquefied natural gas storage tank is formed on the secondary insulation wall is installed to interview the surface formed inside the hull of the ship, the secondary sealing wall formed on the upper surface thereof and the upper surface thereof In the present invention, it is preferable that the tank is a pre-assembled corner structure and a planar structure, respectively, as a pre-assembly from the outside of the ship to be assembled in the tank inner space.

In other words, the pre-fabricated corner structure is first fixed inside the hull, and then the planar structure is assembled based on this, and the fixing of the planar structure is achieved by assembling the anchor structure at the assembly site of the tank.

6 is a cross-sectional view showing the internal structure of the corner structure constituting the liquefied natural gas storage tank according to an embodiment of the present invention, Figure 7 is a liquefied natural gas storage tank installed in a ship according to an embodiment of the present invention Is a whole perspective view showing the connection relationship between the corner structures. 8 is a partially enlarged cross-sectional perspective view showing a corner structure of the liquefied natural gas storage tank installed in the vessel according to an embodiment of the present invention.

In the corner structure 100 according to the exemplary embodiment of the present invention, as shown in FIGS. 6 to 8, the corner secondary insulation wall 53 is L-shaped so as to interview each corner point where the hull surface of the ship meets. It is formed as, the upper secondary side of the corner sealing wall 52 is attached and fixed in the same form, and the upper portion of the pre-assembled in a structure in which the corner primary insulating wall 51 is formed. Here, the corner portion primary insulation wall 51 and the corner portion secondary insulation wall 53 are preferably adhered to the upper and lower surfaces of the corner portion secondary sealing wall 52 by adhesive to be firmly fixed. Do.

The above-described connection between the corner support plate 50, the primary and secondary insulating walls 51 and 53, the secondary sealing wall 52 and the upper and lower supporting rods 70 and 60 will be described in more detail. Same as

The inside of the vessel for storing the LNG (LNG) is formed with a bottom bottom surface (1) and the partition wall (2) integrally therewith to form a space in which the corner structure of the present invention can be installed, the present invention It relates to a corner structure provided at the point where the lower bottom surface 1 and the left and right or transverse bulkheads 2 meet at a predetermined angle. Therefore, the shape of the secondary insulating wall is different from the L-shape because the connection angle of the tank surface is different depending on the shape of the tank or the position of the corner.

As described above, at the point where the lower bottom surface 1 and the partition wall 2 meet at a predetermined angle, the L-shaped secondary insulating wall 53 which is in contact with the lower bottom surface 1 and the partition wall 2 is provided. Is formed. In the present invention, the use of the terms 'primary' and 'secondary' is a function of primarily sealing or insulating the liquefied natural gas based on the liquefied natural gas stored in the storage tank. It is used as a division criteria for functioning.

The secondary heat insulating wall 53 is formed of a secondary heat insulating material 58 of polyurethane foam material and a second heat insulating wall plate 56 of plywood material bonded to the lower surface thereof. The secondary insulation wall plate 56 is to be in contact with the lower bottom surface 1 and the partition wall 2 formed inside the hull. Constitution methods, shapes, materials, and the like of insulating walls are known from US4747513, WO8909909, US5501359, US5586513, JP2000-038190 (public), US6035795, JP2001-122386 (public), and the like. For reference, the heat insulation walls, bonded wood, and the like described in these patents may be used.

When the secondary heat insulation wall 53 is formed, the secondary sealing wall 52 is positioned on the upper surface thereof. The secondary sealing wall 52 serves to block secondary leakage gas of the liquefied natural gas stored in the storage tank. The upper surface of the secondary heat insulating material 58 of the secondary heat insulating wall 53 is bonded to the lower surface of the secondary sealing wall 52 by an adhesive. The material of the secondary sealing wall 52 is preferably an aluminum sheet or a flexible sheet (aka 'Triplex'). The reference patent US6035795 describes a flexible triplex, but in the present invention, it is preferable to use a rigid triplex.

As described above, when the secondary heat insulating wall 53 and the secondary sealing wall 52 are combined, the lower support rod 60 for fixing with the primary heat insulating wall 51 formed on the upper surface thereof. It penetrates the secondary heat insulation wall 53 and the secondary sealing wall 52.

That is, the secondary insulating wall 53 has a through hole through which the lower support rod 60 can pass at a predetermined interval, and the lower support rod is formed at a lower portion of the through hole formed in the secondary insulating wall plate 56. The rod support cap 61, which can be firmly fixed to the lower part of the 60, is inserted and supported by the secondary heat insulation wall plate 56.

The lower support rod 60 is inserted into the rod support cap 61 to penetrate the secondary heat insulation wall 53, and then the lower portion of the lower support rod 60 is fixed nut 62 in the support cap 61. ) Is firmly fixed.

In addition, an upper portion of the lower support rod 60 that penetrates the secondary insulation wall 53 passes through a secondary sealing wall 52 fixed to an upper surface of the secondary insulation wall 53. The sealing wall 52 is fixed on the lower support rod 60 by the support nut 63 and the sealing wall fixing nut 64 fastened to the lower support rod 60.

As described above, the upper end portion of the lower support rod 60 fixed through the secondary insulation wall 53 and the secondary sealing wall 52 is fixed through the lower portion of the primary insulation wall 51.

That is, the primary heat insulating wall 51 is attached and fixed to the secondary sealing wall 52 fixed to the upper surface of the secondary heat insulating wall 53, the configuration is the secondary sealing wall 52 and Of the lower plate member 55 of the primary insulation wall 51 which is attached to and fixed by an adhesive or the like, the primary insulation material 57 formed on the upper surface thereof, and the primary insulation wall 51 attached and fixed to the upper surface thereof. The upper plate 54 is made. The upper and lower plates 54 and 55 of the primary insulation wall are made of plywood, and the primary insulation 57 is made of polyurethane foam.

In this case, the connection reinforcing rod 90 is positioned on the lower plate member 55 of the primary heat insulating wall 51 through which the lower support rod 60 penetrates. That is, the upper end portion of the lower support rod 60 fixed through the secondary insulation wall 53 and the secondary sealing wall 52 is located on the lower plate 55 of the primary insulation wall 51. Penetrating through the reinforcement 90 is to be fixed in a bolt-nut fastening method.

The lower portion of the plurality of (pair in the drawing) of the upper support rod 70 is fixed to the connecting reinforcement 90, the fixing method is fixed to the lower surface of the connecting reinforcement 90 in the same manner as welding The upper support rod 70 is inserted into the rod support cap 71 and then fixed to the fixing nut 72.

Accordingly, the upper end of the lower support rod 60 penetrating the secondary heat insulation wall 53 and the secondary sealing wall 52 and the lower end of the upper support rod 70 penetrating the primary insulation wall 51 are firmly secured. It is fixed.

In addition, in FIG. 6A, the upper support rod 70 is fixed to and supported by the primary heat insulation wall 51 and the upper plate material 54, and the upper plate material 54 of the primary heat insulation wall 51. The L-shaped corner support plate 50 is positioned and supported so as to receive the asymmetrical load of the storage tank described above on the upper surface. Here, the corner support plate 50 is mechanically coupled so as to be slidably movable without bonding with the adhesive of the primary heat insulation wall 51 to enable contraction and extension by heat. The first sealing wall 250 to be described later on the corner support plate 50 is to be coupled and positioned by welding or the like.

Another embodiment of the method of coupling the upper support rod 70 and the corner support plate 50 is shown in FIG. That is, the upper support rod 70 penetrates the primary heat insulation wall 51 and the upper plate member 54 thereon to directly couple to the corner support plate 50 to support the corner support plate 50. At this time, the upper support rod 70 has some space between the primary heat insulating wall 51 and the corner portion, and the direct coupling by the adhesive or the like between the corner support plate 50 and the primary heat insulating wall 51. Since the corner support plate 50 does not exist, sliding of the corner support plate 50 with respect to the primary heat insulation wall 51 is possible. Such sliding eliminates the difference in elongation rate for temperature change due to the difference in material between the primary insulation wall 51 and the corner support plate 50.

In addition, by this structure, the primary sealing wall of the corner portion, the lower support rod 60 coupled to the tank bottom, the upper support rod 70 coupled to the lower support rod 60, the upper support rod ( It is stably supported by the corner support plate 50 coupled with 70). In addition, since the corner support plate 50 is composed of a rather thick thick plate, it is possible to stably support the primary sealing wall of the corner portion where an asymmetrical stress is generated.

In addition, the material of the secondary sealing wall 52 forming the corner structure 100 of the present invention is an aluminum sheet or a flexible sheet (Triplex) material, the corner secondary sealing wall 52 is the corner portion It is formed to protrude further from the side of the primary heat insulating wall 51 and the corner secondary heat insulating wall 53 to be coupled to the secondary sealing wall 203 of the pre-assembly of the neighboring flat portion in a later process.

9 is a perspective view showing a planar structure constituting the liquefied natural gas storage tank according to the present invention, the planar structure 200 constituting the present invention is introduced into the hull in a pre-assembled state outside the hull The planar structure 200 has a structure similar to that of the corner structure 100, and an upper plate 205 made of a plywood material is installed on the planar primary insulating wall 204.

That is, the lower plate 201 is provided on the flat part secondary heat insulation wall 202 which is in contact with the inner surface 1 of the hull, and the flat part secondary heat insulation wall of polyurethane foam (Polyurethane Foam) is provided on the upper face. 202 is attached, and a flat secondary sealant wall 203 of aluminum sheet or a flexible sheet (preferably Rigid Triplex) is attached to the upper face, and again the polyurethane foam ( Planar primary insulation wall 204 made of Polyurethane Foam) material and the upper plate 205 of the plywood material is attached.

In addition, the planar secondary insulating wall lower plate 201 and the secondary sealing wall 203 is slightly protruded from the side of the primary and secondary insulating walls (202, 204) to the neighboring planar structure 200 or later in the process The corner structure 100 is to be mutually fixed and fixed, the corner portion of the opposite surface in contact with the corner structure 100 is formed in a stepped shape cut partly to be assembled and fixed by the anchor structure 150 of the present invention. The height of the planar structure 200 of the present invention having such a structure is manufactured to be equal to the height of the neighboring corner structure 100.

FIG. 10 is a perspective view of a boundary jaw and stud pins 109 installed on an inner wall of the ship, FIG. 11 is a perspective view of a corner structure inserted into the boundary jaw of FIG. 10, FIG. 12 is a perspective view of fixing a corner structure of FIG. 11, and FIG. FIG. 12 is a perspective view illustrating a planar structure adjacent to the corner structure of FIG. 12, FIG. 14 is a perspective view of the anchor structure supporting the anchor support rod after the planar structure of FIG. 13 is fixed, and FIG. Fig. 16 is a perspective view of fixing a plurality of planar structures to the hull inner wall, Fig. 17 is a perspective view of fixing an anchor part secondary sealing wall shown in the planar structure of Fig. 16, Fig. 18 17 is a perspective view of the anchor portion secondary sealing wall inserted into the anchor portion of the anchor portion 17, Figure 19 is a perspective view of fixing the anchor portion secondary sealing wall of Figure 18, Figure 20 is an anchor portion secondary sealing wall of Figure 19 A perspective view of installing the anchor insulation plate, Figure 21 is anchor insulation of Figure 20 Perspective view of a fixing member, 22 is a perspective view showing a perspective view of the primary heat insulating material is filled is installed, and Fig. 23 is the primary sealing wall 22 in Fig.

Hereinafter, a liquefied natural gas storage tank and a process for installing such a tank according to an embodiment of the present invention will be described in detail with reference to FIGS. 10 to 23.

Liquefied natural gas storage tank according to the present invention is installed on the lower bottom surface (1) of the hull and the left and right sidewalls or transverse bulkheads (2) which extend at a vertical or constant angle in the left and right or transverse direction.

First, the corner boundary jaw 80, 81, which can fix the corner structure 100, is fixed to the lower bottom part 1 and the partition wall 2. At this time, the method of fixing the corner boundary jaw (80, 81) is a suitable method by welding, the distance from the corner is to the extent that can be inserted into the corner structure 100 is assembled. As such, the corner structure 100 inserted between the corner boundary jaws 80 and 81 has a predetermined gap formed between the boundary jaws 80 and 81.

10 to 12, between the boundary jaw 80 and 81, when the corner structure 100 is mounted, the fixing base 101 is fixed to the boundary jaw 80 and 81.

At this time, the fixing method adopts a method of bolting the fixing base 101 to the boundary jaw (80, 81). The fixing base 101 has a protrusion corresponding to the clearance between the boundary jaw 80 and 81 and the corner structure 100, so that the corner structure 100 and the boundary jaw 80 when fixing the fixing stand 101 are formed. It is desirable to fill the play between 81 and to prevent flow. The lower bottom portion 1 or the partition wall 2 and the bottom surface of the corner structure 100 inside the hull are coupled by bonding, and secondly, the inner corner jaw 80 and 81 are corner structure 100 of the present invention. ) Is attached and fixed.

At the same time, as shown in FIG. 13, the anchor base plate 110 of the anchor structure 150 for fixing the planar structure 200 continuously installed from the corner structure 100 to the lower bottom portion ( 1) and the partition wall (2) is fixed at regular intervals.

To this end, a group of stud pins 109 are installed on the inner surface of the hull at regular intervals. At this time, the stud pin 109 is sharply processed to the bottom surface 1 or the part in contact with the partition wall 2, and then welded in a pressurized state, the stud pin 109 to the inner wall surface of the hull Are welded.

Next, a through hole corresponding to the stud pin 109 is formed in the stud pin 109 to insert the anchor base plate 110 inserted into the stud pin 109. At this time, the anchor base plate 110 is coupled to the inner wall surface of the hull by welding or bonding. In addition, the thickness of the anchor base plate 110 is the same as the thickness of the flat plate secondary insulating wall lower plate 201.

Subsequently, as shown in FIG. 14, the anchor lower plate 111 is coupled to the upper portion of the anchor base plate 110 so as to cover the protrusion of the flat plate secondary insulating wall lower plate 201. To this end, the anchor lower plate 111 has a through hole formed at a position corresponding to the stud pin 109, and a nut is fastened to the stud pin 109 penetrating the anchor lower plate 111 so that the anchor base plate. The fixing of 110 is made.

As described above, the planar structure 200 is fixed to the lower plate 201 by the fixing base 101 or the anchor lower plate 111 is limited in the upward movement, to allow some sliding in the horizontal direction do. That is, the anchor lower plate 201 prevents the planar sphere 200 formed of the preliminary assembly from moving upward.

Next, as shown in FIGS. 14 and 15, the anchor support rod 112 is vertically fixed to the central portion of the anchor lower plate 111.

To this end, a predetermined digging space is formed in the central portion of the anchor lower plate 111. In addition, an anchor base plate 110 is positioned below the anchor lower plate 111.

In this case, a plurality of through holes corresponding to the stud pins 109 are formed in the anchor base plate 110, and through the through holes in the stud pins 109, the anchor base plate 110 is installed. Next, the anchor base plate 110 is fixed by fastening the stud pin 109 penetrating the anchor base plate 110 with a nut.

On the other hand, in the seating space of the anchor lower plate 111, the rod support cap 120 is installed through a hole formed in the center of the anchor base plate 110. The rod support cap 120 includes a nut or a nut structure formed integrally therein. In the present invention, a central portion of the rod support cap 120 is nut-processed, and the rod support cap 120 is described above. The anchor support rod 112 is vertically coupled.

Here, the rod support cap 120 and the nut is the same manner as the rod support cap 61 and the fixing nut 62 shown in FIG.

Here, the anchor support rod 112 may be heat transfer to the upper or lower, but in the design considering the diameter of the anchor support rod 112 and the heat transfer rate to other parts from the liquefied natural gas in the tank to the hull It is desirable to minimize heat transfer.

The anchor support rod 112 serves to primarily support the load generated from the primary sealing wall attached in a later process, the heat insulation wall pre-assembly is weak direct coupling by the primary sealing wall and the adhesive, etc. Since the sliding of the primary sealing wall is allowed to be somewhat different from the heat insulating wall, the stability of the tank structure is increased against deformation of the hull.

It is to fix the position of each planar structure 200 around the anchor lower plate 111 and the anchor support rod 112 of the present invention by the fixing method as described above. At this time, the planar structure 200 is inserted and fixed between the gap formed by the hull inner surface 1 and the anchor lower plate 111.

The planar structure 200 is introduced into the hull in a pre-assembled state from the outside of the hull, the plate 205 is bonded to the upper portion of the planar primary insulation wall 204 of the planar structure 200.

That is, the flat plate secondary insulation wall lower plate 201 is provided to the hull inner surface 1, the flat portion secondary insulation wall 202 of the polyurethane foam (Polyurethane Foam) is attached to the upper surface To this upper surface, a flat part secondary sealing wall 203 made of aluminum sheet or flexible sheet is again attached, and the flat part primary insulation of polyurethane foam material is again attached to this upper surface. The upper plate 205 of plywood material is attached to the wall 204 and its upper surface.

In addition, the planar secondary insulating wall lower plate 201 and the secondary sealing wall 203 is slightly protruded from the side of the primary and secondary insulating walls (202, 204) to the neighboring planar structure 200 or later in the process The secondary sealing wall of the corner structure 100 to be fixed to each other, the corner portion of the opposite surface in contact with the corner structure 100 is stepped shape cut part to be assembled and fixed by the anchor structure 150 of the present invention Is formed. The height of the planar structure 200 of the present invention having such a structure is manufactured to be equal to the height of the neighboring corner structure 100.

The pre-assembled planar structure 200 of the present invention is fixed to the inner surface of the hull protrudes from the side of the planar secondary insulation wall 202 on the other side of the fixture for fixing the corner structure (not shown) to the boundary jaw The flat part secondary insulation wall lower plate 201 is inserted, and the flat part secondary insulation wall lower plate 201 protruding from the corner portion of the opposite surface contacting the corner structure 100 is the hull inner surface 1. It is fixed in such a way that the anchor base plate 110 of the metal material fixed to and the anchor bottom plate 111 of the plywood material fixed to the upper surface is formed in the interspace portion formed.

As described above, when the planar structure 200 is inserted and fixed around the anchor lower plate 111 and the anchor support rod 112 forming the anchor structure of the present invention, as shown in FIG. The vehicle heat insulation wall 113 is inserted. On the upper surface of the anchor secondary insulating wall 113, an anchor secondary sealing wall 114 having a circular corrugation 115 is located, and the secondary sealing wall 114 is an anchor supporting rod ( While being supported by the locking step 121 formed in the 112, it is firmly fixed by the fixing nut 123 is bolted to the support rod 112 after being inserted.

When the position of the planar structure 200 is fixed, as shown in FIGS. 15 to 22, the space formed by the corner insulation structure 100 and the secondary insulation walls 53 and 202 of the planar structure 200 is polyurethane. While filling with a heat insulating material made of a foam material, the anchor portion secondary insulation wall 113 and the anchor portion secondary sealing wall 114 is inserted into the anchor support rod 112.

The anchor secondary insulation wall 113 is made of polyurethane foam insulation and plywood plate and the cross section is rectangular shape, the anchor portion secondary sealing wall 114 fixed to the upper surface is aluminum sheet Or a flexible sheet material.

As described above, the LNG storage tank configured as described above generates a partial stress due to the bending of the hull due to waves during the movement of the ship, and when the deformation occurs in the hull, the stress applied to the insulation and the secondary sealing wall increases. Thus, in order to reduce the stress generated in the sealing wall, the anchor portion secondary sealing wall 114, as shown in Figure 23, it is preferable that the circular wrinkles 115 are formed. That is, the wrinkle part 115 is extended or contracted in the direction in which the planar structure 200 is slidably moved during the sliding movement of the planar structure 200 to prevent mechanical or thermal deformation applied to the insulation or the sealing wall.

In addition, there is a tendency for the connection between the planar structure 200 to open due to the stress issued to the insulating wall layer. At this time, since the planar structure 200 of the storage tank according to the present invention is hung on the anchor lower support plate 111 of the anchor structure 150, some sliding movement is possible in a state where the separation is prevented.

When the stress is generated in the hull for the above reason, the corner structure 100 is fixed, but each planar structure 200 is capable of partial lateral sliding when the hull deformation, the deformation of the hull the insulation wall layer itself Can absorb.

As described above, the corner structure 100 of the present invention and each planar structure 200 are installed on the inner surface of the hull, and then the insulating material 211 of the polyurethane foam material is formed in the space formed by each secondary insulation wall After filling, each neighboring secondary sealing wall is connected and fixed by the fixing means.

That is, the secondary sealing wall 52 of the corner structure 100 and the secondary sealing wall 203 of the planar structure 200 adjacent thereto are fixed, and the neighboring secondary sealing wall of the planar structure 200 ( While fixing the 203 to each other, the secondary sealing wall 114 adjacent to the secondary sealing wall 203 of the planar structure 200 is to be fixed to each other.

In addition, the insulating member 210 made of polyurethane foam is filled in the space formed by each primary insulating wall.

The upper sealing wall 250 is coupled to the upper portion. The primary sealing wall is preferably welded to the upper cap 119 which is to be welded (preferably fillet welded) to the anchor portion. The primary sealing wall is described in detail below.

24 is an enlarged cross-sectional view showing a means for fastening the secondary sealing wall in the liquefied natural gas storage tank according to the present invention, Figure 25 is a mutual sealing of the secondary sealing wall in the liquefied natural gas storage tank according to the present invention An enlarged perspective view showing the means. In addition, Figure 26 is an enlarged partial cross-sectional perspective view showing the coupling relationship of the anchor structure in the liquefied natural gas storage tank according to the present invention.

Here, the fixing method is fixed by the fixing means as shown in FIGS. 24 and 25, and this fixing method is applied to all of the secondary sealing walls of the present invention.

That is, as shown in FIG. 24 as an example, the space portion (ie, the heat insulation) formed by the corner portion primary and secondary insulation walls 57 and 58 and the planar portion primary and secondary insulation walls 204 and 202 of the present invention. The lower fixing plate 213 and the upper fixing plate 212 are positioned to face each other with the secondary sealing walls 52 and 203 interposed between the secondary sealing walls 52 and 203 protruding from each other. At this time, although not particularly limited, when the lower fixing plate 213 and the upper fixing plate 212 are fixed as the fixing bolts 214, the secondary sealing walls 52 and 203 are firmly fixed.

Here, the lower fixing plate 213 and the upper fixing plate 212 use a metal material.

In addition, the lower fixing plate 213 and the upper fixing plate 212 connects and fixes the respective secondary sealing walls 52 and 203 in a curved form, which is the facing surface of each of the lower fixing plate 213 and the upper fixing plate 212. The addition is made possible by forming the curved surface uneven portions corresponding to each other. As such, the ends of the secondary sealing wall are connected in a curved shape, thereby improving the sealing property of the secondary sealing wall against the LNG leakage of the primary sealing wall, which may occur at any time.

In addition, the combination of the lower fixing plate 213 and the upper fixing plate 212 is preferably some length bend in the longitudinal direction, and have a certain length, and the storage tank is filled with liquefied natural gas, the temperature is lowered to thermal Even if it shrinks, the load due to mechanical / thermal shrinkage and expansion can be easily eliminated, such as providing room to absorb the stress.

In addition, the coupling structure of the secondary sealing wall can provide a degree of freedom to the insulation wall by combining the secondary sealing wall independently of each insulation wall and the hull, especially deformation of the inner surface of the hull That is, it is possible to prevent damage to the insulating wall.

As described above, the lower space formed by the corner structure 100 and the planar structure 200 is filled with a heat insulating material, and each secondary sealing wall is fixed by the fixing means. Next, the washer is inserted into and fastened to the anchor support rod 112 integrally with the washer. At this time, the washer of the nut is to maintain the upper portion of the heat insulating material pressed in a predetermined pressure. Here, after the LNG is stored in the storage tank of the ship, the volume of the heat insulating material, that is, the thickness is reduced by the expansion pressure of the LNG and the nut is designed in consideration of the reduced thickness of the heat insulating material in the support rod 112 Is fastened to.

Then, the anchor insulation plate 118 is attached and fixed to the upper surface again, and the circular anchor upper cap 119 is inserted and fixed again to the center portion. To this end, a predetermined slotting space is formed in the upper center of the anchor insulation plate 118, and the anchor upper cap 119 is located in the space. The anchor upper cap 119 includes a nut, or the nut structure is integrally formed so as to be coupled to the upper end of the anchor support rod 112 to complete the assembly of the anchor structure 150.

FIG. 26 is an enlarged partial cross-sectional perspective view illustrating the coupling relationship of the anchor structure in the liquefied natural gas storage tank according to the present invention. The anchor structure 150 according to the present invention assembled through a series of processes is shown in FIG. The same coupling structure is taken.

When the corner structure 100 and the planar structure 200 according to the present invention through the above assembly process is installed on the inner surface of the hull, and the anchor structure 150 is assembled, as shown in Figure 20, the corner structure 100, each of the planar structure 200 and the anchor structure 150 is filled with a heat insulating material in the interspace portion (the upper portion of the space formed by the secondary heat insulation wall) of the primary heat insulation wall 204. In this case, glass wool is used as the insulating material to be filled in order to more easily relieve thermal stress by flexibly responding to thermal contraction of the primary insulating wall. In addition, when the torsion of the hull occurs, there is an effect that the pre-assembly unit can move somewhat in compliance with the torsion of the hull.

As described above, after filling the insulating material such as glass wool in the space of the primary insulating wall formed by each assembly structure, the membrane-type primary sealing wall 250 having a pleated portion 251 on the upper surface thereof. ) Will be fixed. The material of the primary sealing wall 250 is mainly made of a stainless steel material excellent in corrosion resistance and thermal stability.

Meanwhile, the material of the primary sealing wall 250 is a material or shape known from a conventional Mark III tank or known in the patent (Domestic Application No. 2001-0010438 or 2001-0010152) known by the present applicant. Can be made, and variations thereof are possible. See also US3299598; US3302359; The primary sealing wall described in US3510278 and the like can also be employed.

In addition, the wrinkle portion 251 is formed in the longitudinal direction along the space portion formed by the respective assembly structure (100,150,200), a plurality of wrinkle portion 251 is formed in the periphery around the wrinkle portion 251 do. The wrinkle part 251 is intended to easily solve the thermal deformation in response to the elastic contraction and expansion of the primary sealing wall 250 is the most severe occurs in direct contact with the stored liquefied natural gas. In addition, the reason why the wrinkle part 251 is formed in the same length direction on the upper part of the space where each primary heat insulating wall is formed is dependent on the thermal contraction and expansion of the primary heat insulating wall and the secondary sealing wall attached thereto. Correspondingly, the thermal stress applied to the storage tank can be easily solved.

27 is a partially cutaway perspective view of a liquefied natural gas storage tank according to another embodiment of the present invention.

According to another embodiment of the present invention, the liquefied natural gas storage tank, as shown in Figure 27, the secondary insulation wall 292 is installed in the space formed inside the structure, such as a vessel for storing the liquefied natural gas And a secondary sealing wall 293 and a primary insulating wall 294 formed on the upper surface thereof.

Here, the primary insulation wall 294 includes a predetermined space portion formed between the ends of the secondary insulation wall 292, and the space portion includes the primary insulation wall 294 and the secondary insulation wall ( A planar connection insulating wall 297 is installed, which is coupled with 293.

An anchor part primary insulating wall 276 is installed at the center of the planar connecting insulating wall 297, and a glass wool in a space between the planar connecting insulating wall 297 and the anchor part primary insulating wall 276. Insulating material including 125 is filled.

Looking at the manufacturing process of the liquefied natural gas storage tank according to another embodiment as described above are as follows.

28 to 36 are perspective views sequentially illustrating a process of assembling the liquefied natural gas storage tank according to another embodiment of the present invention into the hull interior space.

In the description of the present specification, in adding reference numerals to the components of each drawing, it is noted that the same reference numerals are used for the same components, even if shown on different drawings.

In addition, in another embodiment of the present invention, the process of fixing the planar structure or the corner structure is the same as the above-described embodiment, in the other embodiments of the present invention will be omitted for the same process.

Through the above-described process, as shown in FIGS. 28 and 29, the planar structure 200 is formed around the anchor lower plate 111 and the anchor support rod 112 forming the anchor structure 150 of the present invention. When inserted and fixed, the anchor portion secondary heat insulation wall 113 is inserted.

On the upper surface of the anchor secondary insulating wall 113, an anchor secondary sealing wall 114 having a circular corrugation 115 is located, and the secondary sealing wall 114 is an anchor supporting rod ( While being supported by the locking step 121 formed in the 112, it is firmly fixed by the fixing nut 123 is bolted to the support rod 112 after being inserted.

Referring also to FIG. 30, the secondary sealing wall 293 fixed to the side of each of the adjacent planar primary insulating walls 294 and the upper portion of the planar secondary insulating wall 292 positioned adjacent to the lower portion thereof. The upper surface is provided with a planar connection insulation wall 297, in the embodiment of the present invention, the planar connection insulation wall 297 is the planar secondary sealing wall 293 or the anchor portion secondary The upper surface of the sealing wall 294 may be fixed with the adhesive (P). Therefore, the planar structure 200 formed of the pre-assembly is limited to move upward by the anchor lower plate 111 at the bottom of the anchor portion. On the other hand, since the pleats are formed around the anchor portion secondary sealing wall 294, even if there is some movement in the transverse direction in the state in which the movement to the top is restricted by the anchor lower plate 111 in the planar structure 200 The sealing wall can absorb its movement.

In this way, the adhesive is more strongly bonded by the combination of the planar connection insulating wall 297 and the secondary sealing walls 114 and 293.

In this case, the planar connection insulating wall 297 may be formed with a gap (1 to 4mm) spaced a predetermined distance from the side of the adjacent planar primary insulating wall 294, the gap formed in this way is the hull When the deformation of the planar structure 200 provides a space for the flow to be able to absorb the deformation amount.

In addition, the planar connection insulating wall 297 is positioned above the neighboring secondary sealing wall 293 and fixes the ends of the anchor portion secondary sealing wall 114 and the planar portion secondary sealing wall 293. Let's do it.

As a result, the planar connection insulating wall 297 is strongly adhered to the planar secondary sealing wall 293 or the anchor secondary sealing wall 114 with an adhesive P. FIG. Therefore, even if the primary sealing wall is damaged, the liquefied natural gas cannot reach the connecting portion of the flat secondary sealing wall 293 or the anchor secondary sealing wall 114, so that leakage of the liquefied natural gas is prevented. It can be blocked reliably.

As described above, after each of the secondary sealing walls (114, 293) is fixed by the fixing means, in the order shown in Figures 31 to 36, the anchor portion primary insulation wall to the anchor support rod 112 116 is inserted, and the anchor upper plate 337 is inserted into the circular recess formed in the upper surface of the anchor portion primary insulation wall 116 to be fixed to the upper end of the anchor support rod 112.

Then, the anchor insulation plate 338 is attached and fixed to the upper surface again, and the circular anchor upper cap 339 is inserted and fixed again to the center portion. To this end, a predetermined slotting space is formed in the upper center of the anchor insulation plate 338, and the anchor upper cap 339 is located in the space. The anchor upper cap 339 includes a nut, or the nut structure is integrally formed to be coupled to the upper end of the anchor support rod 112 to complete the assembly of the anchor structure 150.

Through the assembling process described above, the space between the anchor structure and the planar structure 200 formed between the primary insulation walls 276 and 297 (the upper portion of the space formed by the secondary insulation wall) is filled with insulation. Can be. In this case, glass wool (325) may be applied as the insulating material to be filled in order to more flexibly respond to the thermal contraction of the primary insulating walls 276 and 297 to more easily solve the thermal stress.

After filling the space formed by the primary insulating walls 276 and 297 with an insulating material such as glass wool 325, as shown in FIG. 36, a membrane having a pleat portion 251 on the upper surface thereof. The primary sealing wall 250 of the mold is attached and fixed. The material of the primary sealing wall 250 may mainly use a stainless steel material excellent in corrosion resistance and thermal stability.

In addition, the material of the primary sealing wall 250 is made of a material known from a conventional Mark III type tank or disclosed in a patent (domestic patent application No. 2001-0010438 or 2001-0010152) known by the present applicant. It is possible to change the shape thereof.

37 and 38 are enlarged cross-sectional views illustrating a state diagram in which secondary sealing walls are fastened to each other in a liquefied natural gas storage tank according to the present invention.

Here, the manner in which the secondary sealing wall 293 is fixed, is fixed by the fixing means as shown in FIGS. 37 and 38, which fixing method mutually fixes all the secondary sealing walls 293 of the present invention. All of them apply.

That is, as shown in FIG. 37 as an example, the portions adjacent to each of the secondary sealing walls 293 protruding into the space portions formed by the adjacent planar primary and secondary insulating walls 292 and 294 of the present invention are close to each other. An upper connection member 312 and a lower connection member 313 coupled to the ends of the secondary sealing wall 293 are installed.

In addition, the secondary sealing wall 293 is coated with a resin material 293a on the upper surface and the lower surface, respectively, and extends into a space portion formed by adjacent heat insulating walls.

At this time, although not particularly limited, if the lower connection member 313 and the upper connection member 312 are fixed as the direct connection screw 314, the secondary sealing wall 293 is firmly fixed. In addition, a through part 297a for inserting the direct screw 314 is formed in the planar connection insulating wall 297.

Here, the fixing bolt or fixing screw 314 is a structure that is fastened by directly drilling the upper connection member 312 or the lower connection member 313, it is possible to work without forming a separate bolt fastening hole Do. For example, a self drilling screw can be used.

In addition, the fixing screw 314 includes a flat washer (314a) or a spring washer (314b) to maintain the upper portion of the heat insulating material pressed in a predetermined pressure. Here, the fixing screw 314 is preferably fastened by reducing the volume of the heat insulating material, that is, the decrease in thickness by the expansion pressure of the LNG.

On the other hand, the engaging surface of the upper connection member 312 and the lower connection member 313 is formed with a groove portion for receiving the secondary sealing wall 293. In addition, irregularities 312a and 313a formed to face each other or to face each other are formed at both ends of the groove. The upper connection member 312 and the lower connection member 313 described above are resin materials 293a having the uneven parts 312a and 313a applied to the secondary sealing wall 293 when fixed by the fixing bolt 314. ) Is pressed.

At this time, the resin material 293a is accommodated in the groove portion between the uneven portions 312a and 313b and a gap between the secondary sealing wall 293 and the upper connecting member 312 or the lower connecting member 313. Seal it. Here, the resin material 293a is made of a curable resin and is cured after being pressed.

Therefore, the sealing property of the secondary sealing wall 203 is improved against the leakage of gas due to breakage of the primary sealing wall 250 which may occur even if it is.

The present invention has been applied to the specific embodiments as shown in each of the above drawings, the present invention is not limited to these specific embodiments, but can be carried out in various modifications within the scope without departing from the spirit of the present invention. Do.

In addition, the present invention can of course be equally applicable to liquefied natural gas storage tanks installed on land as well as liquefied natural gas storage tanks installed inside the hull of a shelf.

As described above, the liquefied natural gas storage tank according to the present invention simplifies the installation process of the storage tank installed inside the ship for transporting the liquefied natural gas, which is a liquid of cryogenic state, and shortens the assembly process, and at the same time, the storage tank It is possible to provide a highly reliable marine, vehicle, and land tank by releasing the stress against mechanical deformation due to the loading or unloading of liquefied natural gas more easily while maintaining the liquid tightness of.

Claims (32)

A tank for loading liquefied natural gas; A primary sealing wall in direct contact with the liquefied natural gas loaded in the tank; A plurality of connecting means for mechanically connecting the tank, the primary sealing wall and the tank; It consists of an intermediate wall structure located between the tank and the primary sealing wall, The intermediate wall structure is a storage tank of liquefied natural gas, characterized in that the sliding movement with respect to any one or more of the tank and the primary sealing wall. The storage tank of claim 1, wherein the intermediate wall structure is movable in a horizontal direction with respect to any one or more of the tank and the primary sealing wall. The storage tank according to claim 1, wherein the intermediate wall structure has a plurality of holes, and the connecting means passes through the holes. The method of claim 1, wherein the intermediate wall structure and the primary insulating wall in contact with the primary sealing wall; A secondary heat insulation wall in contact with the tank; Storage tank of liquefied natural gas, characterized in that consisting of a secondary sealing wall located between the primary and secondary insulating walls. The storage tank of liquefied natural gas according to claim 4, wherein the secondary sealing wall is liquid-tightly connected between the intermediate wall structure and the connecting means. The storage tank for liquefied natural gas according to claim 5, wherein the primary insulating wall, the secondary sealing wall, and the secondary insulating wall forming the intermediate wall structure are bonded to each other by an adhesive. The storage tank of claim 6, wherein the intermediate wall structure includes a planar structure and a corner structure, and the planar structure and the corner structure are each formed as a pre-assembly. The storage tank of liquefied natural gas according to claim 7, wherein the tank is installed in a ship. The storage tank for liquefied natural gas according to any one of claims 1 to 8, wherein the intermediate wall structure includes a planar structure provided at a flat portion of the wing tank and a corner structure provided at a corner portion of the tank. . The method according to claim 9, wherein the corner structure is adhesively bonded to the tank is movable only with respect to the primary sealing wall, the planar structure is liquefied natural, characterized in that the movable with respect to the primary sealing wall and the tank. Storage tank of gas. Insulation module used for storage tank of liquefied natural gas, The module has a lower end protruding to facilitate assembly between adjacent modules, Sliding movement with respect to any one or more of the storage tank and the primary sealing wall between the storage tank of the liquefied natural gas and the primary sealing wall installed inside the storage tank and in direct contact with the liquefied natural gas Module for manufacturing a storage tank of liquefied natural gas, characterized in that installed so as to be possible. The module of claim 11, wherein the module comprises: a primary insulating wall; A secondary sealing wall bonded to the lower portion of the primary insulating wall with an adhesive; Module for producing a storage tank of liquefied natural gas, characterized in that consisting of a secondary insulating wall is bonded to the lower portion of the secondary sealing wall with an adhesive. The module according to claim 12, wherein the module forms a quadrangular pillar, and at least one corner portion is formed in a stepped shape in which a portion is cut. The module for manufacturing a storage tank of liquefied natural gas according to claim 12, wherein the module forms an L shape. The method of claim 11, wherein the module is A primary insulating wall; An upper plate attached to an upper portion of the primary insulating wall; A secondary sealing wall attached to a lower portion of the primary insulating wall; A secondary insulating wall attached to a lower portion of the secondary sealing wall; Consists of a lower plate attached to the lower portion of the secondary insulating wall, The lower plate member is a module for manufacturing a storage tank of liquefied natural gas, characterized in that extending from one or more sides of the secondary insulating wall to form a flange. The module for manufacturing a storage tank of liquefied natural gas according to claim 15, wherein the portions of the primary or secondary heat insulating wall, the sealing wall, and the upper and lower plate members contact each other with an adhesive. 17. The module of claim 16, wherein the secondary sealing wall protrudes from at least one side surface of the primary and secondary insulating walls. The module for manufacturing a storage tank of liquefied natural gas according to claim 17, wherein the secondary sealing wall is connected liquid-tightly between the modules. The module for manufacturing a storage tank of liquefied natural gas according to claim 18, wherein the heat insulation wall is polyurethane foam. And two continuous sealing walls and two insulating walls, wherein the primary sealing walls are in contact with the liquefied natural gas stored in the storage tank, and below the primary insulating walls, the secondary sealing walls, and two. In the storage tank of liquefied natural gas arranged in the order of the car insulation wall, The primary sealing wall is supported by an anchor portion mechanically coupled to the tank bottom surface, The primary insulating wall, the secondary sealing wall and the secondary insulating wall are formed of planar structures having upper and lower surfaces thereof coupled to the planar portion of the tank, and each of the planar structures slides between the primary sealing wall and the tank bottom surface. Natural gas storage tank, characterized in that installed possible. The method of claim 20, The planar structure is made of a pre-assembled liquefied natural gas storage tank, characterized in that assembled on the basis of the anchor to constitute an insulation system. The method according to claim 20 or 11, The primary sealing wall is a liquefied natural gas storage tank, characterized in that coupled to the upper end of the anchor portion by welding. The method of claim 22, Liquefied natural gas storage tank, characterized in that the upper end of the anchor portion is an anchor support rod end installed in the anchor portion or an anchor upper cap coupled thereto. The method according to claim 23, The secondary sealing wall extends into the space portion of the side surface formed by the heat insulation wall, End portions of the extended secondary sealing wall are joined by an upper fixing plate and a lower fixing plate, The coupling surface of the upper fixing plate and the lower fixing plate is a liquefied natural gas storage tank, characterized in that it comprises a groove formed so that the end of the secondary sealing wall is inserted. The method of claim 20, A corner structure coupled to an edge portion of the tank; A planar structure slidably positioned on a plane within the tank; A liquefied natural gas storage tank comprising an anchor structure coupled to the bottom surface of the tank to attach the planar structure to the inside of the tank. The method according to claim 25, The planar structure is liquefied, characterized in that it is made of a preliminary assembly is provided with a planar secondary insulating wall, the planar secondary sealing wall formed on the upper surface thereof and the planar primary insulating wall formed on the upper surface thereof Natural gas storage tanks. The method according to claim 25, The corner structure is a corner portion secondary heat insulating wall formed in the L shape so as to interview each corner point where the surface formed in the tank meets, the corner portion secondary sealing wall formed on the upper surface thereof and the corner formed on the upper surface thereof The secondary primary heat insulating wall and the upper surface of the corner primary heat insulating wall are made of a pre-assembly provided with an additional L-shaped corner support plate so as to receive the load of the storage tank on the corner boundary jaw formed on the inner surface of the tank, respectively. Liquefied natural gas storage tank, characterized in that fixed by. The method of claim 26, The corner support plate is a liquefied natural gas storage tank, characterized in that the slide is installed so as to be movable in the primary insulating wall of the corner portion to enable the contraction and extension by heat. The method according to any one of claims 25 to 28, In the corner structure, the secondary insulation wall and the primary insulation wall are connected to connect and fix the upper end of the lower support rod protruding through the secondary insulation wall and the lower end of the upper support rod penetrating the primary insulation wall. LNG storage tank, characterized in that the mechanical coupling by the reinforcement. The method of claim 29, The upper support rod is liquefied natural gas storage tank, characterized in that coupled to the corner support plate to pass through the primary insulating wall to support the corner support plate. The method of claim 30, The upper support rod is a liquefied natural gas storage tank, characterized in that coupled to the corner support plate by welding. 32. The liquefied natural gas storage tank according to claim 31, wherein the primary sealing wall is welded to the upper end of the anchor portion.

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