KR102315220B1 - Liquefied gas storage tank and vessel comprising the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and a ship including the same. According to the present invention, the liquefied gas storage tank is formed by a combination of unit blocks, which includes: a first insulating wall to which a metal primary barrier is fixed; a secondary barrier provided on the outside of the first insulating wall; and a second insulating wall disposed outside the secondary barrier. The first insulating wall constituting the upper layer of each of the unit blocks includes: a square insulation wall having a square cross section; and a rectangular insulation wall having a rectangular cross section.

Description

Liquefied gas storage tank and vessel comprising the same

The present invention relates to a liquefied gas storage tank and a ship including the same.

According to recent technology development, liquefied gas such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) is widely used to replace gasoline or diesel.

In addition, in ships that transport or store liquefied gas such as LNG at sea, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit), etc. Storage tanks (so-called "cargo holds") are installed for storing LNG in a cryogenic liquid state.

In addition, the liquefied gas storage tank may generate boil-off gas (BOG) due to heat intrusion from the outside, and the natural vaporization rate (BOR), which is the vaporization rate of the boil-off gas through the adiabatic design, is Lowering the liquefied gas storage tank is a key technology. In addition, since the liquefied gas storage tank is exposed to various loads such as sloshing, it may be essential to secure the mechanical strength of the insulation panel.

Considering this point, the structure of the primary insulating wall and/or the secondary insulating wall can be related to the natural vaporization rate, which is the vaporization ratio of the boil-off gas, and the mechanical strength of the liquefied gas storage tank, so it can be called the basic structure of the liquefied gas storage tank. Research on the structure of a unit block in which the primary insulating wall / secondary barrier / insulating wall is laminated is being actively studied.

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to provide a space between neighboring unit blocks when the unit blocks in which the primary insulating wall / secondary barrier / insulating wall are stacked are arranged adjacently. It is to provide a liquefied gas storage tank and a ship including the same so that the structural sealing.

A liquefied gas storage tank according to an aspect of the present invention includes a primary thermal insulation wall to which a metal primary barrier is fixed, a secondary barrier provided on the outside of the primary thermal insulating wall, and disposed outside the secondary barrier A liquefied gas storage tank formed by a combination of unit blocks including secondary insulating walls, wherein the primary insulating wall constituting the upper layer of each of the unit blocks includes: a square insulating wall having a square cross section; and a rectangular heat insulating wall having a rectangular cross section.

Specifically, the primary insulating wall may have an anchor strip made of a metal material to which the primary barrier is fixed by welding.

Specifically, the anchor strip may include: a first anchor strip provided along a first direction; and a second anchor strip provided in a second direction perpendicular to the first direction, wherein an interval between the plurality of first anchor strips may be different from an interval between the plurality of second anchor strips.

Specifically, the rectangular thermal insulation wall surrounds the front, rear, left and right sides of the square thermal insulation wall based on the square thermal insulation wall, and includes a first rectangular thermal insulation wall arranged horizontally and a second rectangular thermal insulation wall arranged vertically. , The first rectangular insulating wall is provided with the first anchor strip and n second anchor strips intersecting the first anchor strip n times, and the second rectangular insulating wall includes the first anchor strip and m second anchor strips intersecting the first anchor strip m times may be provided, and n and m may be different natural numbers.

Specifically, the square insulating wall may be provided with only one of the first anchor strip and the second anchor strip, and there may be no intersection of the anchor strips.

Specifically, the rectangular thermal insulation wall is arranged one by one on one side based on the two square thermal insulation walls, and in the rectangular thermal insulation wall, the first anchor strip and the n number of the first anchor strips intersect n times. A second anchor strip is provided, and the first anchor strip and m second anchor strips intersecting the first anchor strip m times are provided on the square insulating wall, wherein n and m are different natural numbers. can

A liquefied gas storage tank according to the present invention and a ship having the same, in the structure of the unit block in which the primary insulating wall / secondary barrier / insulating wall are stacked, make the side of the secondary thermal insulation wall stepped so that at least two unit blocks are adjacent By configuring so that the step of the secondary insulating wall engages when disposed, the structure between adjacent unit blocks can be sealed, and the natural vaporization rate, which is the vaporization rate of the boil-off gas, and the mechanical strength of the liquefied gas storage tank can be improved.

In addition, the liquefied gas storage tank and the ship having the same according to the present invention is a combination of a square insulating wall of a first size having a square cross section and a rectangular insulating wall of a second size having a rectangular cross section. By configuring it, it can be formed by a combination of a square insulation wall and a rectangular insulation wall, which are smaller in size compared to the existing primary insulation wall, so that handling can be facilitated during construction.

1 is a partial cross-sectional view for explaining a liquefied gas storage tank according to a first embodiment of the present invention.
FIG. 2 is a partially cross-sectional perspective view taken along line A-A' of FIG. 1 .
3 (a) and (b) are perspective views of a unit block in which the primary insulating wall / secondary barrier / barrier insulating wall is stacked according to the first embodiment of the present invention.
4 (a) and (b) are partial cross-sectional views for explaining a liquefied gas storage tank according to a second embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

Hereinafter, in this specification, liquefied gas may be used to encompass all gas fuels that are generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. can be expressed as This can be applied to boil-off gas as well. In addition, for convenience, LNG may be used to encompass both natural gas (NG) in a liquid state as well as LNG in a supercritical state, etc. can

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

1 is a partial cross-sectional view for explaining a liquefied gas storage tank according to a first embodiment of the present invention, FIG. 2 is a partial cross-sectional perspective view taken along line A-A' of FIG. 1, and FIG. 3 (a) and (b) is a perspective view of a unit block in which the primary insulating wall / secondary barrier / insulating wall is stacked according to the first embodiment of the present invention. If FIG. 3(a) shows the front side of the unit block, FIG. 3(b) may show the back side of the unit block.

1 to 2, the liquefied gas storage tank 1 according to the first embodiment of the present invention is provided in a ship and liquefied such as LNG, which is a cryogenic (about -160°C to -170°C) material. gas can be stored.

Although not shown, the ship provided with the liquefied gas storage tank (1) described below is a concept that encompasses offshore structures that float at a certain point on the sea and perform specific tasks in addition to merchant ships that transport cargo from the origin to the destination. let me know In addition, in the present invention, the liquefied gas storage tank (1) puts out that any type of tank for storing liquefied gas is included.

The liquefied gas storage tank (1) is a primary barrier (2) in contact with the liquefied gas, a primary insulating wall (3) installed on the outside of the primary barrier (2), a primary insulating wall (3) installed on the outside The secondary barrier (4) may be configured to include a secondary heat insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating wall (5) and the hull (7).

In the above, the liquefied gas storage tank 1 may include a flat surface and a corner structure. For example, a transverse wall in the front-rear direction of the liquefied gas storage tank 1, a floor between the transverse walls, a vertical wall, and a ceiling may correspond to a planar structure. In addition, for example, a structure in which the lateral wall, the floor, the vertical wall, and the ceiling of the liquefied gas storage tank 1 meet may correspond to a corner structure. Here, the corner structure may include an obtuse corner structure or a right angle corner structure.

The liquefied gas storage tank (1) has a primary insulating wall (3), a secondary barrier (4) provided on the outside of the primary insulating wall (3), and a secondary insulating wall arranged on the outside of the secondary barrier (4) After arranging adjacent unit blocks (UB) in which (5) is laminated, the secondary insulating wall (5) is fixed to the hull (7), and the primary barrier (2) is installed on the primary insulating wall (3). can be formed.

The primary barrier 2 forms an accommodating space for accommodating liquefied gas, which is a cryogenic material, and may be made of a metal material. For example, the metal material may be a stainless steel material, but is not limited thereto. The primary barrier (2) can prevent leakage of liquefied gas to the outside together with the secondary barrier (4).

The primary barrier (2) is in direct contact with liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank (1), and after disposing the unit block (UB) adjacent to it, the primary insulating wall (3) and the connecting insulating wall ( 3a) may be fixedly installed by welding on an anchor strip (not shown) provided on the upper part.

The primary barrier 2 may be formed of a corrugation membrane sheet made of a stainless steel material having a thickness of 1.0 to 1.5 mm, preferably a stainless steel material having a thickness of 1.0 to 1.2 mm. That is, the primary barrier 2 may be formed in a wrinkled shape.

The first insulating wall (3) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking the intrusion of heat from the outside, and the primary barrier (2) and the secondary barrier (4) ) can be installed between

The primary insulating wall 3 may have a structure in which the primary plywood 31 and the primary insulating material 32 are sequentially stacked to the outside of the primary barrier 2 .

The primary plywood 31 may be installed between the primary barrier 2 and the primary insulating material 32 .

The primary plywood 31 may be formed to a thickness of 6.5mm to 15mm. For example, in the present embodiment, it may correspond to a thickness of about 12 mm.

The primary insulating material 32 may be formed of a material having excellent thermal insulation performance and excellent mechanical strength so as to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside. have.

The primary insulating material 32 may be formed of polyurethane foam between the primary plywood 31 and the secondary barrier 4 .

The primary thermal insulation wall 3 may be a part of the unit block UB together with the secondary barrier 4 and the secondary thermal insulation wall 5 . Here, the first heat insulating wall 3 constituting the unit block UB may have a width smaller than the width of the second heat insulating wall 5 which is another component of the unit block UB. Due to this, a portion of the secondary barrier 4 may be exposed on both sides of the primary insulating wall 3 . The unit blocks UB may be disposed adjacent to each other, and in this case, the connecting insulating wall 3a may be installed in the space portion between the neighboring primary insulating walls 3, that is, in the space part where the secondary barrier 4 is exposed. have.

The connection insulating wall 3a is disposed between the adjacent primary thermal insulation walls 3 when the unit blocks UB are arranged adjacent to each other, and the same or similar connection plywood 31a as the primary thermal insulating wall 3 and The connection insulating material 32a may be provided in a stacked form.

When the unit blocks UB are arranged adjacent to each other, the connection insulating wall 3a seals the space generated between the adjacent secondary insulating walls 5 together with the connection barrier 4a to prevent heat intrusion from the outside. It is installed to perform the role of blocking. In the case of this embodiment, as will be described later, the front, rear, left, and right sides of the secondary heat insulating wall 5 are formed to be stepped, so that when the unit blocks UB are disposed adjacently, the steps are engaged while the adjacent unit blocks UB are structurally can be sealed, thereby increasing the heat intrusion blocking efficiency.

The secondary barrier 4 may be installed between the primary insulating wall 3 and the secondary insulating wall 5 , and may prevent leakage of liquefied gas to the outside together with the primary barrier 2 .

The secondary barrier 4 may be a part of the unit block UB together with the primary thermal insulation wall 3 and the secondary thermal insulation wall 5 . The secondary barrier 4 constituting the unit block UB may be connected to the neighboring secondary barrier 4 by the connecting barrier 4a when the unit block UB is disposed adjacently.

The connecting barrier 4a may connect the neighboring secondary barriers 4 exposed to the outside when the unit blocks UB are disposed adjacently, and the connecting insulating wall 3a may be installed thereon.

The secondary insulating wall 5 is, together with the primary insulating wall 3 and the connecting insulating wall 3a, block heat intrusion from the outside and withstand the shock from the outside or the shock caused by the liquefied gas sloshing from the inside. can be designed

The second heat insulating wall 5 may be a part of the unit block UB together with the first heat insulating wall 3 and the secondary barrier 4, and is formed so that the front, rear, left and right sides are stepped, and at least two unit blocks ( When the UB) is disposed adjacently, the step difference of the secondary heat insulating wall 5 may be engaged to form a seating surface of the connection barrier 4a.

The secondary insulating wall 5 may be installed between the secondary barrier 4 and the hull 7 , and may include a secondary insulating material 51 and a secondary plywood 52 .

The secondary insulating material 51 may be formed of a material having excellent thermal insulation performance and excellent mechanical strength so as to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside. have.

The secondary insulating material 51 may be formed of polyurethane foam between the secondary barrier 4 and the secondary plywood 52 .

In this embodiment, the secondary insulating material 51 may be formed such that the front, rear, left, and right sides have a step difference, and when at least two unit blocks UB are disposed adjacently, the step is engaged and the gap between the adjacent secondary insulating materials 51 is may be structurally sealed. For this reason, since a vertical gap is not formed between the adjacent secondary insulating materials 51 as in the prior art, filling of a separate insulating material (eg, glass wool, etc.) can be omitted.

This secondary insulating material 51, as shown in Figs. 3 (a) and (b), so as to have a step on the front, rear, left and right sides, the outer insulation material (51a) fixed to the secondary plywood (52) And, it may be formed of an inner insulation material 51b which is provided to be displaced from the outer insulation material 51a to form a step difference and is fixed to the secondary barrier 4 .

The inner insulating material 51b may have the same cross-sectional size as the outer insulating material 51a.

The inner heat insulating material 51b and the outer heat insulating material 51a may be integrally formed, not limited thereto, and may be of a separate type.

The secondary plywood 52 may be installed between the secondary insulating material 51 and the hull 7 . For example, the secondary insulating material 51 may be installed in contact with the secondary plywood (52).

In addition, the secondary insulating material 51, as shown in Figure 3 (b), may further include an adhesive insulating material (51c) attached to the stepped side.

The adhesive insulating material 51c is provided on at least two side surfaces of the front, rear, left and right sides of each of the outer heat insulating material 51a and the inner heat insulating material 51b, and may be continuously provided on at least two side surfaces.

The adhesive insulating material 51c may be adhesively formed with an insulating material such as glass wool on the stepped side of the second insulating wall 5 when the unit block UB is manufactured, and may be glass wool.

As described above, in this embodiment, in the structure of the unit block (UB) in which the primary insulating wall (3) / secondary barrier (4) / secondary insulating wall (5) is laminated, the front and rear left and right sides of the secondary insulating wall (5) By configuring the step difference of the second heat insulating wall 5 to engage when at least two unit blocks UB are disposed adjacent to each other, the structure between the adjacent unit blocks UB can be sealed, so that the It is possible to improve the natural vaporization rate, which is the vaporization rate, and the mechanical strength of the liquefied gas storage tank.

In addition, in this embodiment, since the non-bonding area based on the secondary barrier 4 is smaller than the non-bonding area based on the existing secondary barrier 4, the thermal stress applied to the secondary barrier 4 can be reduced. .

In addition, in the present embodiment, since the bonding area is conversely increased by the sloshing load and other loads, the deformation of the secondary barrier 4 due to the load between the non-bonding areas can be reduced.

In addition, this embodiment is vulnerable to thermal convection after the secondary barrier because the gap (eg, a gap of 30 mm) between the existing adjacent secondary insulating walls is vertically drilled, and although the gap is filled with glass wool Although it reduces the flow, there is a limit in solving the thermal convection phenomenon because glass wool itself is a porous material, whereas in this embodiment, the outer insulation material 51a and the inner insulation material 51b made of an insulation material such as polyurethane foam are mutually By overlapping to form a closed cell structure, it is possible to further reduce the thermal convection phenomenon compared to the existing one, and also in terms of productivity, it is possible to omit the operation of inserting glass wool into the gap compared to the existing method, thereby reducing the man-hours. .

In addition, in the present embodiment, when the unit block UB is manufactured, the work man-hours can be reduced by bonding the adhesive insulating material 51c with an insulating material such as glass wool to the stepped side of the secondary insulating wall 5 .

4 (a) and (b) are partial cross-sectional views for explaining the liquefied gas storage tank according to the second embodiment of the present invention.

The liquefied gas storage tank 1 according to the present embodiment relates to the structure of the first insulating wall 3 .

The liquefied gas storage tank 1 to which the first insulating wall 3 of this embodiment is applied may have the same or similar basic configuration to the first embodiment described above, hereinafter, the liquefied gas storage tank 1 according to the first embodiment described above. It will be described with reference to the configuration of the gas storage tank (1).

However, the first insulating wall 3 of this embodiment, in the case of the liquefied gas storage tank 1 of the first embodiment, not only can be applied to a configuration in which the side of the secondary insulating wall 5 is stepped, but is not limited thereto, Unlike the first embodiment, a known liquefaction having a metal anchor strip (AS) in which the primary barrier (2) is fixed to the primary insulating wall (3) by welding while the side of the secondary insulating wall (5) is not stepped. It should be noted that it can also be applied to the configuration of the gas storage tank. In addition, the primary heat insulating wall 3 of this embodiment may be disposed in a unit block (UB) state together with the secondary barrier 4 and the secondary insulating wall 5 as in the first embodiment, but is not limited thereto. After the secondary barrier (4) and the secondary heat insulating wall (5) are arranged, it may be separately arranged on the secondary barrier (4).

That is, in this embodiment, the primary thermal insulation wall 3 to which the primary barrier 2 made of metal is fixed, the secondary barrier 4 provided on the outside of the primary thermal insulation wall 3, and the secondary barrier ( 4) Liquefied gas formed by a combination of the unit block UB of the first embodiment including the secondary thermal insulation wall 5 disposed outside the second thermal insulation wall 5 as well as other unit blocks in which the side surface of the secondary thermal insulation wall 5 is not stepped Can be applied to storage tanks.

As described in the first embodiment, the primary insulating wall 3 has a structure in which the primary plywood 31 and the primary insulating material 32 are sequentially stacked on the outside of the primary barrier 2 made of metal. can have

As shown in Fig. 4 (a), the primary insulating wall 3 of this embodiment forms an upper layer of each unit block, and a square insulating wall 3b having a square cross section, and a square insulating wall 3b. Surrounding the, may include a rectangular heat insulating wall (3c) having a rectangular cross section.

The square insulating wall 3b may be formed in a first size, and the rectangular insulating wall 3c may be formed in a second size. Here, the second size may be twice the first size.

When the rectangular heat insulating wall 3c is disposed to surround the front, rear, left, right, and left sides of the square heat insulating wall 3b based on one square heat insulating wall 3b, the square heat insulating wall 3b is horizontally arranged with respect to 2 It may include two first rectangular heat insulating walls 3c1 and two second rectangular heat insulating walls 3c2 vertically arranged.

The primary insulating wall 3 has an anchor strip AS of a metal material to which the primary barrier 2 is fixed by welding.

The anchor strip AS may include a first anchor strip AS1 provided along a first direction and a second anchor strip AS2 provided in a second direction perpendicular to the first direction.

An interval between the plurality of first anchor strips AS1 may be different from an interval between the plurality of second anchor strips AS2 .

In the present embodiment, the first anchor strip AS1 and n second anchor strips AS2 crossing the first anchor strip AS1 n times may be provided on the first rectangular insulating wall 3c1, A first anchor strip AS1 and m second anchor strips AS2 crossing the first anchor strip AS1 m times may be provided on the two rectangular insulating wall 3c2. Here, n and m are different natural numbers.

In addition, any one of the first anchor strip AS1 and the second anchor strip AS2 may be provided on the square insulation wall 3b, and there is no intersection of the anchor strips AS.

In addition, in this embodiment, as shown in Fig. 4 (b), the primary insulating wall 3 of this embodiment forms an upper layer of each unit block, and a square insulating wall 3b having a square cross section and , surrounds the square heat insulating wall (3b), may include a rectangular heat insulating wall (3c) having a rectangular cross section.

The square insulating wall 3b may be formed in a first size, and the rectangular insulating wall 3c may be formed in a second size.

The rectangular heat insulating wall 3c may be arranged one by one on one side of the square heat insulating walls 3b1 and 3b2 based on the two square heat insulating walls 3b1 and 3b2.

The primary insulating wall 3 has an anchor strip AS of a metal material to which the primary barrier 2 is fixed by welding.

The anchor strip AS may include a first anchor strip AS1 provided along a first direction and a second anchor strip AS2 provided in a second direction perpendicular to the first direction.

An interval between the plurality of first anchor strips AS1 may be different from an interval between the plurality of second anchor strips AS2 .

In the present embodiment, the first anchor strip AS1 and n second anchor strips AS2 crossing the first anchor strip AS1 n times may be provided on the rectangular insulating wall 3c.

In addition, the first anchor strip AS1 and m second anchor strips AS2 crossing the first anchor strip AS1 m times may be provided on the square insulating walls 3b1 and 3b2. Here, n and m are different natural numbers.

As described above, in the present embodiment, the primary insulating wall 3 is a combination of a first size square insulating wall 3b having a square cross section and a rectangular insulating wall 3c of a second size having a rectangular cross section. ), it can be formed by a combination of a square insulation wall and a rectangular insulation wall, which are smaller in size than the existing primary insulation wall, and can be easily handled during construction.

In addition, in this embodiment, by disposing a square insulating wall (3b) and a rectangular insulating wall (3c) having different sizes while being smaller than the existing ones, the secondary barrier (4) is installed long in the existing longitudinal direction when disposing However, the present invention can be arranged short, so that the crack propagation phenomenon that is transmitted laterally when there is a tear or damage can be relatively small. That is, if the secondary barrier is installed as one long as in the past, if the breakage occurs once in the middle, it may be torn sideways. In this embodiment, since the secondary barrier 4 is separated, Only the line is damaged and the rest are unaffected.

In addition, in this embodiment, as the overall length of the secondary barrier 4 becomes smaller, the overall deformation can be reduced relative to the conventional for thermal stress.

Although the present invention has been described in detail through specific examples, this is for the purpose of describing the present invention in detail, and the present invention is not limited thereto, and by those of ordinary skill in the art within the technical spirit of the present invention. It will be clear that the transformation or improvement is possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Liquefied gas storage tank 2: Primary barrier
3: 1st insulation wall 31: 1st plywood
32: primary insulation material 3a: connection insulation wall
31a: connecting plywood 32a: connecting insulation material
3b: square insulation wall 3b1: first square insulation wall
3b2: second square insulation wall 3c: rectangular insulation wall
3c1: first rectangular thermal insulation wall 3c2: second rectangular thermal insulation wall
4: Secondary barrier 4a: Connection barrier
5: Second insulation wall 51: Second insulation material
51a: outer insulation material 51b: inner insulation material
51c: adhesive insulation 52: secondary plywood
6: Mastic 7: Hull
UB: unit block AS: anchor strip
AS1: 1st Anchor Strip AS: 2nd Anchor Strip

Claims (6)

Formed by a combination of a unit block including a primary heat insulating wall to which a metal primary barrier is fixed, a secondary barrier provided outside the primary insulating wall, and a secondary insulating wall disposed outside the secondary barrier As a liquefied gas storage tank,
The first insulating wall constituting the upper layer of each of the unit blocks,
a square insulation wall having a square cross section; and
It includes a rectangular thermal insulation wall having a rectangular cross section,
The first insulating wall,
The primary barrier has an anchor strip of a metal material fixed by welding,
The anchor strip is
a first anchor strip provided along a first direction; and
It includes a second anchor strip provided in a second direction perpendicular to the first direction,
The interval between the plurality of first anchor strips is,
different from the spacing between the plurality of second anchor strips,
The rectangular insulation wall,
Surrounding the front, rear, left and right sides of the square insulation wall based on the square insulation wall, it comprises a first rectangular insulation wall arranged horizontally and a second rectangular insulation wall arranged vertically,
In the first rectangular insulating wall, the first anchor strip and n second anchor strips intersecting the first anchor strip n times are provided,
The first anchor strip and m second anchor strips intersecting the first anchor strip m times are provided on the second rectangular insulating wall,
Liquefied gas storage tank, characterized in that the n and the m are different natural numbers. delete delete delete According to claim 1, wherein the square insulating wall,
Any one of the first anchor strip and the second anchor strip is provided, and the liquefied gas storage tank, characterized in that there is no intersection of the anchor strips. delete

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