KR100649317B1 - Corner structure of lng storage tank - Google Patents

Abstract

A corner structure of an LNG(Liquefied Natural Gas) storage tank is provided to enable a corner part to efficiently remove a mechanical stress generated in the storage tank. In a conner structure of an LNG(Liquefied Natural Gas) storage tank, an insulation wall is installed at an inner surface of the storage tank storing LNG and forms an insulation layer. A plurality of sealing films is installed at an upper part of the insulation wall and is in contact with the LNG. A corner structure is installed at the edge of storage tank for supporting the sealing films. The corner structure includes a corner member(101) connecting and fixing between the sealing films and the inner surface of the storage tank and an insulating material formed around the corner member. The corner member includes a fixing member(110) fixed at the inner surface of edge of the storage tank and a movable member(130) supported to be capable of a linear movement on the fixing member.

Description

Corner structure of LNG storage tank {CORNER STRUCTURE OF LNG STORAGE TANK}

1 is a schematic cross-sectional view of a vessel provided with a storage tank of liquefied natural gas according to the prior art,

2 is a cross-sectional view showing a portion of a storage tank of liquefied natural gas according to the prior art;

3 is a perspective view of a corner member according to a preferred embodiment of the present invention;

4 is a longitudinal sectional view showing a part of a storage tank of liquefied natural gas in a state where a corner structure including a corner member is installed according to a preferred embodiment of the present invention;

5 is a cross-sectional view of the corner structure taken along line A-A of FIG. 4,

6 is a cross-sectional view of the corner structure taken along line B-B of FIG. 4.

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

10: storage tank 12: inner wall

14 bulkhead 51 first sealing film

52: second sealing membrane 61: stud bolt

62: nut 100: corner structure

101: corner member 103, 203: heat insulating material

105, 205: plywood 110: fixing member

111a to 111d: extension part 112, 122: fixing part

113: guide groove 120: connection member

130: movable member 131: first joint

132: second joint 133: guide projection

136: slot 200: planar structure

The present invention relates to a corner structure of a liquefied natural gas storage tank installed inside a ship, and more particularly, to the inside of a liquefied natural gas storage tank installed inside a ship for storing and transporting liquefied natural gas, which is a liquid in an ultra low temperature state. It is related with the corner structure arrange | positioned so that a heat insulation wall and a sealing wall may be installed in a wall surface.

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 storage tank or a vehicle installed on the ground or buried underground depending on the location It is divided into a mobile storage tank installed in a vehicle, such as a ship.

The above-described liquefied natural gas has a risk of explosion when exposed to an impact, and is stored at an extremely low temperature. 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 have to be prepared against mechanical stresses due to flows, compared to land storage tanks with little flow. have. However, since the liquefied natural gas storage tank installed on the vessel provided with a countermeasure against mechanical stress can be used for the land storage tank, of course, the structure of the liquefied natural gas storage tank installed on the vessel will be described as an example.

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

As shown in FIG. 1, a ship in which a storage tank of liquefied natural gas is installed is usually a double structure including an outer wall 16 forming an outer shape and an inner wall 12 formed inside the outer wall 16. Have a hull The inner wall 12 and the outer wall 16 of the vessel 1 are integrally formed by being connected by a connecting rib 13, and in some cases, may be made of a hull of a single structure in which the inner wall 12 does not exist. have.

Also, the interior of the hull, ie the interior of the inner wall 12, can be divided by one or more partitions 14. The partition wall 14 may be formed by a known cofferdam installed in a conventional LNG storage vessel 1.

Each interior space divided by the partition 14 may be utilized as a storage tank 10 for loading cryogenic liquids such as liquefied natural gas.

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

The sealing wall 50 which is in direct contact with the liquefied natural gas in the cryogenic state may be formed with wrinkles to cope with a temperature change according to the loading of the liquefied natural gas, as is known.

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

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

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

In addition, the sealing wall 50 is mainly supported by the anchor structure 30, the corner structure 20 and the planar structure 40 only supports the load of LNG applied to the sealing wall 50 and the anchor structure ( There is no direct link between the two.

Figure 2 is a cross-sectional view showing a portion of the storage tank of liquefied natural gas according to the prior art, which is filed by the applicant and registered in Korean Patent No. 499710.

In the conventional liquefied natural gas storage tank 10 shown in FIG. 2, secondary insulation walls 22, 32, and 42 and primary insulation walls 24, 34, and 44 are sequentially installed on the bottom surface of the hull. Secondary sealing walls (23, 33, 43) are provided between the secondary insulating walls (22, 32, 42) and the primary insulating walls (24, 34, 44) to seal between them. In addition, the primary sealing wall 50 is provided on the upper portion of the primary insulating walls 24, 34, 44.

The storage tank 10 of liquefied natural gas configured as described above includes a corner structure 20 installed at a corner portion of the inside, an anchor structure 30 installed at regular intervals on a bottom surface, and the corner structure 20 or an anchor. It includes a planar structure 40 inserted between the structures 30 so as to be slidably movable. In this case, the corner structure 20, the anchor structure 30, the planar structure 40 is a pre-fabricated in each unit module, and then assembled to the storage tank 10, the primary sealing wall 50 It is provided thereon and liquid-tightens the heat insulation wall, thereby providing a space in which the LNG can be stored in the inner space.

As shown in FIG. 2, the corner structure 20, the anchor structure 30, and the planar structure 40 each have a primary insulation wall 24, 34, 44, a secondary insulation wall 22, 32, 42) and secondary sealing walls 23, 33, 43, which are collectively defined as heat insulating wall structures 20, 30, 40.

On the other hand, in each heat insulation wall structure 20, 30, 40, the contact surface of the secondary sealing wall of each unit module, and each heat insulation wall is formed integrally by adhering with an adhesive agent. Typically, the secondary insulating walls 22, 32, and 42 are made of a polyurethane foam, which is an insulating material, and a plate attached to the bottom thereof. In addition, the primary heat insulation walls 24, 34, 44 are made of a polyurethane foam and a plate attached to the upper portion with an adhesive. In addition, the primary sealing wall is installed on the upper portion of the primary insulating wall (24, 34, 44) is fixed to the anchor structure 30 by welding.

In addition, a flange 42a formed larger than the secondary heat insulation wall 42 is formed at the lower end of the secondary heat insulation wall 42 of the planar structure 40. The flange 42a is inserted into the groove portion formed at the lower end of the anchor structure 30, and is installed to allow some sliding movement.

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

On the other hand, the anchor structure 30 is the primary sealing wall 50 is welded to the upper end of the anchor support rod 36 is coupled.

In addition, the anchor structure 30 is located at the connection point of the neighboring planar structure 40 and interconnected with each other, the planar structure 40 is the hull inner wall 12 or partition 14 forming the storage tank 10 It is fixed to). In addition, the fixing member 37 of the anchor structure 30 is installed around the anchor support rod 36.

However, in the conventional LNG storage tank, the heat insulation wall structure is composed of primary and secondary insulation walls and primary and secondary sealing walls, and the structure is not only complicated, but also a structure for connecting secondary sealing walls. It is complicated and the work of the insulation wall is not easy. In addition, the structure and installation work of the anchor portion or the connecting portion of the secondary sealing wall is difficult, there is a fear that the problem of LNG leakage due to the reliability of the sealing of the LNG is lowered on the secondary sealing wall.

In addition, the conventional corner structure 20 which only supports the load of LNG applied to the sealing wall 50 and does not support the sealing wall 50 has a thermal deformation of the storage tank according to the loading of the LNG in the cryogenic state. There was room for improvement in absorbing the stresses generated during deformation of the hull.

A new structure different from the conventional liquefied natural gas storage tank to solve these problems and to reduce the BOG (Boiled Off Gas), the structure that is lost by vaporization of LNG, which is a cryogenic liquid state, the structure, and the manufacturing process. Has been proposed, and therefore the structure of the corner structure also requires a new structure.

An object of the present invention for solving the above problems is to simplify and improve the structure of the insulation wall and the sealing wall, and the coupling structure thereof in the LNG storage tank, while increasing the reliability of the seal, To simplify the assembly structure and manufacturing process to shorten the drying time of the tank, and to provide a corner structure of the liquefied natural gas storage tank of the improved structure that the corner portion can more effectively solve the mechanical stress generated in the storage tank. .

In order to achieve the above object, according to an aspect of the present invention, the insulating wall is installed on the inner surface of the storage tank for loading the liquefied natural gas to form a heat insulating layer, and the liquefied natural gas is installed on the top of the insulating wall and A liquefied natural gas storage tank comprising a directly contacted sealing film and a corner structure installed at an edge of the storage tank to support the sealing film, wherein the corner structure connects between an inner surface of the storage tank edge and the sealing film. A corner member for fixing and a heat insulating material formed around the corner member, wherein the corner member includes: a fixing member fixed to an inner surface of the corner of the storage tank, and a movable member supported on the fixing member so as to be linearly movable. A corner structure of a liquefied natural gas storage tank is provided, comprising a member.

In addition, according to another aspect of the present invention, a corner member for directly connecting and fixing between the inner surface of the corner of the storage tank for loading liquefied natural gas and the sealing film for sealing the storage tank, the corner member is A corner member of the liquefied natural gas storage tank is provided, comprising: a fixing member fixed to an inner surface of the corner of the storage tank, and a movable member supported linearly on the fixing member.

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

3 is a perspective view of a corner member according to a preferred embodiment of the present invention, Figure 4 is a longitudinal cross-sectional view showing a portion of the storage tank of liquefied natural gas with the corner structure including the corner member is installed. have. 5 and 6 show cross-sectional views of corner structures taken along lines A-A and B-B of FIG. 4.

3 to 6, the corner member 101 according to the preferred embodiment of the present invention is fixed to the inner surface of the storage tank 10, that is, the surfaces of the inner wall 12 and the partition wall 14. The fixing member 110 and the movable member 130 supported on the fixing member 110 and to which the sealing films 51 and 52 are bonded are included.

Here, the movable member is installed so as to be able to move finely linearly with respect to the fixing member, as described later, when the deformation of the hull due to the heat deformation or the wave caused by the temperature change according to the loading of the LNG in the cryogenic state. do.

The fixing member 110 has a (+) shape in which four first to fourth extension parts 111a to 111d cross each other at right angles when viewed from the front. Of these four first to fourth extensions 111a to 111d, two adjacent first and second extensions 111a and 111b are fixed to the inner surface of the storage tank 10 and the remaining two adjacent ones are fixed. The third and fourth extension parts 111c and 111d support the movable member 130.

The four first to fourth extensions 111a to 111d may be manufactured and then integrally formed with each other by welding, or two extensions, that is, the first and second extensions 111a and 111b or the first and fourth extensions 111a to 111d. Each of the third and fourth extension portions 111c and 111d may be integrally formed and then integrally formed by welding or the like.

The two first and second extensions 111a and 111b have a trapezoidal shape that becomes wider toward the storage tank 10 when viewed from the side in order to enlarge the contact area with the inner surface of the storage tank 10 (FIG. 4).

At the ends of the first and second extension portions 111a and 111b, as will be described later with reference to FIGS. 4 to 6, the inner surface of the storage tank 10, that is, the inner wall 12 or the partition 14, The fixing part 112 for fixing the corner member 101 is formed on the surface.

The fixing part 112 may be manufactured integrally with the first and second extension parts 111a and 111b or may be manufactured separately and integrally mounted by welding or the like.

The fixing part 112 is formed with a plurality of through holes 112a at regular intervals, and accordingly, the plurality of stud bolts 61 are fixedly mounted on the inner surface of the storage tank 10 in the through holes 112a. ) Can be inserted and fixed by the nut 62.

As shown in FIGS. 4 and 5, the through holes 114 are inserted into the third and fourth extension parts 111c and 111d to be coupled with the movable member 130. Guide grooves 113 for guiding the movable member 130 supported to move finely linearly are formed.

The movable member 130 has an approximately L-shaped cross section so that the movable member 130 may be arranged along an edge portion of the storage tank 10.

Two joining parts, that is, the first joining part 131 and the second joining part 132, are formed in the movable member 130 with a predetermined height difference from each other. The first and second sealing films 51 and 52 are fixedly attached to these first bonding portions 131 and the second bonding portions 132 by welding.

In addition, the portion facing the fixing member 110 of the movable member 130, as shown in Figures 4 and 5, the bolt 109 is inserted through the coupling for the fixing member 110 A guide protrusion 133 is formed along the hole 134 and the guide groove 113 of the fixing member 110 to allow the movable member 130 to move finely linearly.

As shown in FIG. 5, the two guide protrusions 133 are manufactured separately from the movable member 130, and the movable member 130 is placed on the fixing member 110 and then the fixing member 110. It is preferable that each of the guide grooves 113 is formed integrally by welding in accordance with the formed position. The reason is that when the two guide protrusions 133 are integrally formed with the movable member 130, the guide groove 113 of the fixing member 110 when the movable member 130 is placed on the fixing member 110 is provided. This is because the guide protrusions 133 of the movable member 130 are not interfering with each other, and thus the fixing member 110 and the movable member 130 cannot be coupled to each other.

The movable member 130 configured as described above is supported by being mounted on two fixing members 110 fixedly installed at regular intervals along the edge of the storage tank 10.

As shown in FIGS. 4 to 6, each fixing member 110 includes a plurality of stud bolts 61 fixed to the inner surface of the storage tank 10 in advance to fix the fixing member 110. Inserted into the through hole 112a formed in the 112, and then fastened by the nut 62, it can be fixed to the inner surface of the storage tank (10).

In addition, the movable member 130 is placed on both ends of the movable member 130 after placing both ends thereof on the fixed member 110 fixed to the inner surface of the storage tank 10 as described above. The fixing member 110 is fastened by passing the through hole 114 formed in the through hole 134 and the through holes 114 formed in the third and fourth extension portions 111c and 111d of the fixing member 110 to fasten the bolt 109. Combined with.

At this time, the coupling between the movable member 130 and the fixed member 110 is not fixed, but when the movable member 130 is stretched along its length direction, the guide groove of the fixed member 110 as described above ( The movable member 130 is linearly moved by the guide protrusion 133 of the 113 and the movable member 130.

To this end, one of the through holes 134 formed through both ends of the movable member 130 and the through holes 114 formed in the third and fourth extension parts 111 c and 111 d of the fixing member 110. The hole is preferably formed in the form of a long hole.

In the middle of the fixing member 110, that is, the central portion of the movable member 130, it is preferable that a connection member 120 having a similar shape to the fixing member 110 is further included.

Like the first and second extension portions 111a and 111b of the fixing member, the connecting member 120 also has a storage tank 10 when viewed from the side to enlarge the contact area with the inner surface of the storage tank 10. It is desirable to have a trapezoidal shape (see FIG. 4) that becomes wider toward the side.

The connecting member 120 is integrally formed with a fixing part 122 in which a through hole 122a is formed. As a result, the connecting member 120 is similar to the fixing member 110. The stud bolt 61 fixedly mounted on the inner surface of the coupling member 120 is inserted into the through hole 122a of the connecting member 120 and fastened with the nut 62 to be installed on the inner surface of the storage tank 10.

On the other hand, the opposite end formed with the fixing portion 122 of the connecting member 120 is coupled to the movable member 130, for example by welding or the like. In this way, a welding slot 136 is formed at a corresponding joining position of the movable member 130 in order to join the connecting member 120 to the movable member 130 by welding. Accordingly, the mounting member 120 and the fixing member 110 are mounted on the inner surface of the storage tank 10, and then the movable member 130 is placed on the connecting member 120 and the fixing member 110. The movable member 130 and the connecting member 120 may be integrally bonded to each other through the welding slot 136.

As described above, the movable member 130 is integrally connected to and fixed to the inner surface of the storage tank 10 through the connecting member 120 at the center portion in the longitudinal direction of the movable member 130. Both ends of the member 130 are coupled to allow fine linear movement with respect to the fixing member 110.

As described above, the inner circumferential wall surface of the storage tank 10 is sealed in a liquid tight state by the first and second sealing films 51 and 52. That is, the first and second sealing films 51 and 52 form a storage space by connecting a plurality of metal plates integrally with each other by welding, whereby the storage tank 10 leaks liquefied natural gas. Can be stored and transported without

The first sealing film 51 which is in direct contact with the liquefied natural gas in an ultra low temperature state and the second sealing film 52 which is provided to be spaced apart from the first sealing film 51 are known to be loaded on the ship's ship. Corrugation may be formed to cope with the temperature change.

These first and second sealing films 51 and 52 are fixedly connected to the inner wall 12 or the partition 14 of the ship 1 by a plurality of corner structures 100 and anchor structures (not shown). . Thus, the first and second sealing films 51 and 52 are not movable relative to the hull.

An insulation wall is arranged between the second sealing film 52 and the inner wall 12 or the partition wall 14 so as to form an insulation layer. The heat insulation wall includes a corner structure 100 disposed at the corner portion of the storage tank 10, an anchor structure (not shown) disposed around the anchor member, and a plane disposed at the flat portion of the storage tank 10. It consists of the structure 200. That is, the entire thermal insulation layer may be formed in the storage tank 10 by the corner structure 100, the anchor structure, and the planar structure 200.

Each of the corner structures 100, the anchor structures and the planar structures 200 arranged in the storage tank 10 may be manufactured as one module in a separate place, and then moved to the storage tank 10 and assembled.

The first and second sealing membranes 51, 52 are supported by the corner structure 100 and the anchor structure, and the planar structure 200 is only LNG applied to the first and second sealing membranes 51, 52. It only supports the load of and there is no direct coupling between the corner structure 100 or the anchor structure (see Fig. 4).

Here, the corner structure 100 is the corner member 101 which directly connects and fixes between the hull and the first and second sealing films 51 and 52, and the corner member 101 around the corner member 101. It consists of a heat insulating material 103 formed integrally with polyurethane foam or reinforced polyurethane foam.

Plywood 105 may be attached to the top, bottom, or top and bottom of the insulation 103. 4 to 6 illustrate examples in which the plywoods 105 and 205 are attached to the upper and lower ends of the heat insulating material 103 constituting the corner structure 100 and the upper and lower ends of the planar structure 200, but the present invention is limited thereto. It doesn't happen.

The corner structure 100 configured as described above is formed on the inner surface of the storage tank 10 through fixing parts 112 and 122 formed on the fixing member 110 and the connecting member 120 of the corner member 101. Is fixed to.

As described above, the through holes 112a and 122a are formed in the fixing portions 112 and 122 at regular intervals, and the through holes 112a and 122a are formed in advance on the inner surface of the storage tank 10. The fixedly mounted stud bolt 61 may be inserted and fixed by the nut 62.

In addition, between the plywoods 105 and 205 attached to the lower portions of the heat insulators 103 and 203 and the inner surface of the storage tank 10, as is known, a horizontal member 63 for leveling may be interposed. Can be. In addition, a washer may be interposed between the upper surface of each fixing part 112 and 122 and the nut 62 fastened to the stud bolt 61.

In addition, as described above, the first bonding portion 131 and the second bonding portion 132 are formed on the movable member 130 of the corner member with a predetermined height difference from each other. The first sealing film 51 is fixedly mounted to the first joint part 131 by welding, and the second sealing film 52 is fixedly mounted to the second joint part 132 by welding.

As shown in FIGS. 5 and 6, the space between the first sealing film 51 and the second sealing film 52 is maintained at a predetermined distance. This separation distance is preferably equal to the height difference between the first bonding portion 131 and the second bonding portion 132 of the corner member 101.

In addition, a constant thickness between the first sealing film 51 and the second sealing film 52 so that the separation distance between the first sealing film 51 and the second sealing film 52 can be kept constant. The support plate 53 which has a is interposed.

The support plate 53 may be interposed over the entirety except for the portion where the first and second sealing films 51 and 52 are arranged in parallel to each other, that is, the portion where the wrinkles are formed, but the remaining portion except the portion where the wrinkles are formed. It may be interposed over some of them.

As the support plate 53, a plywood of a certain thickness is used alone, a polyurethane foam (or a reinforced polyurethane foam) of a constant thickness is used alone, or a polyurethane foam (or a reinforced polyurethane foam). Plywood is attached to at least one of the upper and lower surfaces of the).

As described above, according to the present invention, since the space between the first sealing film 51 and the second sealing film 52 is spaced apart, it is higher than the temperature of the first sealing film 51 which is in direct contact with the cryogenic LNG. The temperature of the second sealing film 52 is kept high so that the life of the second sealing film 52 can be longer than the life of the first sealing film 51.

Further, according to the present invention, since the space between the first sealing film 51 and the second sealing film 52 is spaced apart, even if the shape of the storage tank is deformed by the external force such as waves, the first and the first No friction occurs between the two sealing films 51 and 52, and even if an impact is applied to one of the sealing films, damage can be prevented from directly propagating to the other sealing film.

On the other hand, the sealing is described as having a double structure by the first sealing film 51 and the second sealing film 52, it is of course also possible to be laminated in a multi-structure of three or more layers.

As described above, according to the present invention, the plurality of through holes 112a and 122a formed in the respective fixing portions 112 and 122 of the fixing member 110 and the connecting member 120 are fixed to the inner surface of the storage tank. The fixing member 110 and the connecting member 120 may be fixed to the hull by inserting a plurality of stud bolts 61 and fastening by the nut 62, respectively.

In addition, as described above, the movable member 130 to which the sealing films 51 and 52 are bonded is capable of fine linear movement with respect to the fixing member 110 by the guide groove 113 and the guide protrusion 133. By welding and fixing the connection member 120 through the welding slot 136, the sealing films 51 and 52 may be fixed to the hull.

According to the present invention, the coupling between the fixing member 110 and the connecting member 120 constituting the corner member 101 and the inner surface of the storage tank is continuously made in a plurality of places, while the movable member 130 is the fixing member. Since it can be linearly moved relative to 110, it is possible to reliably absorb the stress generated due to the deformation of the hull due to heat deformation or external force such as waves due to the loading of LNG.

In the above embodiments of the present invention, the fixing member and the connecting member are described as being fixed to the inner surface of the hull by a mechanical coupling method such as bolts and nuts, but the fixing member and the fixing member of the connecting member are the inner surface of the hull. It is also possible, of course, to be fixed directly welded to.

The corner structure may be modularized and assembled in a storage tank of a ship after being manufactured and transported in a separate place.

Further, in the above embodiment of the present invention, although the sealing film is described as being made of corrugated stainless steel used for, for example, GTT Mark-III, it may be made of Invar steel used for No. 96 of GTT.

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.

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.

As described above, according to the present invention, in the liquefied natural gas storage tank, the structure of the heat insulating wall and the sealing wall and the coupling structure thereof are simplified and improved to facilitate the operation, and the sealing structure is increased, and the assembly structure and There is provided a corner structure of a liquefied natural gas storage tank of an improved structure, which simplifies the manufacturing process, shortens the drying time of the tank, and more effectively eliminates the mechanical stress generated in the storage tank.

Claims (22)

A heat insulation wall disposed on an inner surface of the storage tank carrying the liquefied natural gas to form a heat insulation layer, a sealing film provided on the upper portion of the heat insulation wall and in contact with the liquefied natural gas, and an edge of the storage tank to support the sealing film. A liquefied natural gas storage tank comprising a corner structure to be installed, The corner structure includes a corner member for connecting and fixing between the inner surface of the corner of the storage tank and the sealing film, and a heat insulating material formed around the corner member, The corner member is a corner structure of the LNG storage tank, characterized in that it comprises a fixed member fixed to the inner surface of the corner of the storage tank, and a movable member supported linearly on the fixed member. The method according to claim 1, The corner member, the corner structure of the liquefied natural gas storage tank further comprises a connecting member for connecting and fixing the movable member to the inner surface of the corner of the storage tank. The method according to claim 1 or 2, The corner member of the liquefied natural gas storage tank, characterized in that the fixing member and the connecting member of the corner member are coupled to a plurality of places with respect to the inner surface of the storage tank edge. The method according to claim 3, Each of the fixing member and the connecting member has a fixing part having a plurality of through holes formed therein, and a plurality of stud bolts fixed to the inner surface of the storage tank are respectively inserted into the through holes to be fastened by nuts. Corner structure of the LNG storage tank, characterized in that the corner member is fixed to the inner surface of the storage tank. The method according to claim 1, Corner member of the liquefied natural gas storage tank, characterized in that the movable member of the corner member is formed with a bonding portion to which the sealing film is bonded. The method according to claim 5, The junction part includes a first junction part and a second junction part which are formed stepwise while having a constant height difference with each other, and the sealing membrane is spaced apart from the first sealing membrane and the first sealing membrane in direct contact with the liquefied natural gas by a predetermined distance. Consisting of a second sealing membrane to be installed, Corner structure of the LNG storage tank, characterized in that the first sealing membrane is bonded to the first junction and the second sealing membrane is bonded to the second junction. The method according to claim 1, A guide groove is formed in the fixed member and a guide protrusion is formed in the movable member, and the liquefied natural gas can be linearly moved on the fixed member when the movable member is moved by the guide groove and the guide protrusion. Corner structure of the storage tank. The method according to claim 7, The guide projection is produced separately from the movable member, and liquefied, which is integrally attached by welding in accordance with the position where the guide groove of the fixed member is formed after placing the movable member on the fixed member. Corner structure of natural gas storage tank. The method according to claim 2, The opposite end formed with the fixing portion of the connection member is coupled to the movable member by welding, the corner structure of the LNG storage tank, characterized in that the slot for the welding operation is formed in the coupling position of the movable member. The method according to claim 1, The sealing membrane is composed of a first sealing membrane in direct contact with the liquefied natural gas and a second sealing membrane installed to be spaced apart from the first sealing membrane by a predetermined distance, A corner structure of the liquefied natural gas storage tank, characterized in that a support plate for interposing the first sealing membrane and the second sealing membrane to maintain a constant gap. A corner member for supporting the sealing membrane by connecting between the inner surface of the corner of the storage tank for loading the liquefied natural gas and the sealing membrane for sealing the storage tank, The corner member is a corner member of the liquefied natural gas storage tank, characterized in that it comprises a fixed member fixed to the inner surface of the corner of the storage tank, and a movable member supported linearly on the fixed member. The method according to claim 11, The corner member, the corner member of the liquefied natural gas storage tank further comprises a connection member for connecting and fixing the movable member to the inner surface of the corner of the storage tank. The method according to claim 12, The fixing member and the connecting member are formed in a trapezoidal shape that becomes wider toward the inner surface of the storage tank edge, and liquefied natural gas storage tank, characterized in that coupled to a plurality of places with respect to the inner surface of the storage tank edge. Corner members. The method according to claim 12, Each of the fixing member and the connecting member has a fixing part having a plurality of through holes formed therein, and a plurality of stud bolts fixed to the inner surface of the storage tank are respectively inserted into the through holes to be fastened by nuts. Corner member of the liquefied natural gas storage tank, characterized in that the corner member is fixed to the inner surface of the storage tank. The method according to claim 11, Corner member of the liquefied natural gas storage tank, characterized in that the movable member of the corner member is formed with a joint portion to which the sealing film is bonded. The method according to claim 15, The joint portion is a corner member of the liquefied natural gas storage tank, characterized in that the first junction portion and the second junction portion formed to be stepped while having a constant height difference from each other. The method according to claim 16, The sealing membrane is composed of a first sealing membrane in direct contact with the liquefied natural gas and a second sealing membrane installed to be spaced apart from the first sealing membrane by a predetermined distance, The first sealing membrane is bonded to the first junction and the second sealing membrane is a corner member of the LNG storage tank, characterized in that bonded to the second junction. The method according to claim 11, A guide groove is formed in the fixed member and a guide protrusion is formed in the movable member, and the liquefied natural gas can be linearly moved on the fixed member when the movable member is moved by the guide groove and the guide protrusion. Corner member of storage tank. The method according to claim 18, The guide projection is produced separately from the movable member, and liquefied, which is integrally attached by welding in accordance with the position where the guide groove of the fixed member is formed after placing the movable member on the fixed member. Corner member of natural gas storage tank. The method according to claim 12, The opposite end formed with the fixing portion of the connecting member is coupled to the movable member by welding, the corner member of the LNG storage tank, characterized in that the slot for the welding operation is formed in the coupling position of the movable member. The method according to claim 11, The sealing membrane is composed of a first sealing membrane in direct contact with the liquefied natural gas and a second sealing membrane installed to be spaced apart from the first sealing membrane by a predetermined distance, A corner member of the liquefied natural gas storage tank, characterized in that a support plate for interposing the first sealing membrane and the second sealing membrane to maintain a constant gap. The method according to claim 21, The support plate material is selected from one consisting of plywood alone, one consisting of polyurethane foam or reinforced polyurethane foam alone, and one having a plywood attached to at least one of the upper and lower surfaces of the polyurethane foam or reinforced polyurethane foam. Corner member of the liquefied natural gas storage tank, characterized in that any one.

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