Liquefied gas storage tank

Abstract

A liquefied gas storage tank according to the present invention is a storage tank for storing a liquefied gas and comprises: a primary barrier that is in contact with the liquefied gas and forms a storage space for the liquefied gas; an insulation wall that is installed on a support structure and provided on the outside of the primary barrier; and an inert gas treatment unit that injects an inert gas into the insulation wall or discharges the liquefied gas leaking into the insulation wall. The primary barrier has corrugations that protrude toward the inside of the storage space, and the corrugations on vertical and bottom portions of the storage space are perpendicular to each other. The inert gas treatment unit is independently installed in a corner portion between the vertical and bottom portions and includes a corner line that causes the inert gas to be conveyed from the vertical portion to the bottom portion.

Description

Liquefied gas storage tank

[0001] The present invention relates to a land-based liquefied gas storage tank.

[0002] Generally, land-based liquefied gas storage tanks are used to store various liquefied gases, including liquefied natural gas (LNG), liquefied petroleum gas (LPG), liquefied oxygen, and liquefied nitrogen.

[0003] The exterior of a conventional land-based liquefied gas storage tank is created by pouring concrete on a foundation to form a cylindrical tank body with a roughly dome-shaped cover.

[0004] According to a conventional land-based liquefied gas storage tank, a vapor barrier is installed inside a tank body (i.e., an outer tank) made of concrete, and an inner tank that directly receives liquefied gas is installed inside the vapor barrier.

[0005] Since the inner part is in direct contact with the liquefied gas at an extremely low temperature, it can be made of materials such as low-temperature steel that can withstand extremely low temperatures, and the vapor barrier can be made of materials such as general carbon steel.

[0006] The inner wall may be formed by installing a plurality of insulation panels on the inner surface and the bottom of the outer wall, and a barrier formed by installing a plurality of corrugation membrane sheets on the insulation wall. The inner wall includes a vertical portion and a bottom portion.

[0007] However, in manufacturing the inner tank, there is no difficulty in installing multiple insulation panels and multiple corrugation membrane sheets along the inner surface of the outer tank in the case of the vertical part, but the bottom part must be manufactured in a circular shape in order to connect with the lower part of the cylindrical vertical part, so regular insulation panels and regular corrugation membrane sheets cannot be used in the peripheral part that comes into contact with the vertical part depending on the arrangement of the insulation panels and corrugation membrane sheets, so not only must irregular insulation panels and irregular corrugation membrane sheets be manufactured separately, but also it is necessary to determine whether the horizontal and vertical wrinkles formed on the bottom part's barrier and the vertical wrinkles formed on the vertical part's barrier are connected, which makes it difficult to manufacture, resulting in problems such as increased manufacturing costs and difficulties in maintenance.

[0008] Additionally, the insulation space between the primary and secondary barriers of land-based liquefied natural gas storage tanks is filled with an inert gas, such as nitrogen. If the nitrogen pressure drops, the primary barrier is deemed damaged and follow-up measures are taken. Therefore, an even pressure distribution across all areas is essential for accurate assessment of damage. Therefore, research and development are underway on devices that can evenly distribute nitrogen throughout the tank.

[0009] The present invention was created to solve the problems of the prior art as described above, and the purpose of the present invention is to provide a liquefied gas storage tank that can be easily manufactured on land, reduce manufacturing costs, and facilitate maintenance.

[0010] According to one aspect of the present invention, a liquefied gas storage tank comprises an outer tank and an inner tank, wherein the inner tank comprises a vertical portion installed on an inner surface of the outer tank, and a bottom portion installed on a bottom surface of the outer tank, wherein the vertical portion and the bottom portion comprise an insulating wall, and a barrier wall installed on the insulating wall and having a grid-shaped corrugation, wherein the vertical portion forms a polygonal column, and the vertical corrugations of the barrier wall are provided in a circumferential direction, and the bottom portion has a polygonal edge corresponding to the polygonal column and is connected to the lower end of the vertical portion, and is divided into a first region in which regular insulating walls and regular barrier walls are arranged, and a second region in which irregular insulating walls and irregular barriers are arranged between the first region and the vertical portion, and at least the second region of the bottom portion arranges vertical corrugations or horizontal corrugations in parallel according to a regular pitch from a reference line passing through the center of the bottom portion.

[0011] Specifically, at least the second region of the bottom section calculates the distance between the point farthest from the reference line and the outer wrinkle of the outer wall that is arranged closest to the point among the vertical wrinkles or the horizontal wrinkles, and according to the calculated distance, the specifications of the outer wall having the vertical wrinkles and the horizontal wrinkles arranged at the regular pitch and the specifications of the end barrier connecting the corner barrier having the bent portion and the outer wall can be determined.

[0012] Specifically, the barrier installed on the floor is arranged orthogonally, and the reference line can pass through the center of any one of the outer sides forming the polygonal pillar that is parallel or perpendicular to the vertical wrinkle or the horizontal wrinkle.

[0013] Specifically, the end barrier is formed so that, when positioned to partially overlap with the outer barrier, the end wrinkle is provided at a position corresponding to the regular pitch from the outer wrinkle of the outer barrier, and the distance is the sum of a first distance that is a distance extending outward from the outer wrinkle and overlapping with the end barrier, a second distance that is a distance extending inward from the end wrinkle and overlapping with the outer barrier, and a third distance that is a distance between the end wrinkle and the inner surface of the vertical portion, and may be at least longer than the regular pitch.

[0014] Specifically, the bottom portion has a plurality of unit elements in the form of isosceles triangles that are radially divided based on the center of the bottom portion, the length of the outer side of the unit element is calculated according to the following equation (1), the number of wrinkles arranged at the regular pitch within the length of the outer side of the unit element is calculated according to the following equation (2), and the arrangement of wrinkles on the outer side of the unit element can be determined differently depending on whether the number of wrinkles is odd or even.

[0015] Equation (1)

[0016] A = 2(D / 2)*sin{(1 / 2)*(360° / M)}

[0017] = 2R*sin{(1 / 2)*2θ}

[0018] = 2R*sinθ

[0019] In equation (1), 'A' is the outer side length of the unit element, 'D' is the inner diameter of the bottom, 'M' is the number of the unit elements of the bottom, 'R' is the radius of the bottom, '2θ' is the vertex angle of the unit element, and 'θ' is an angle obtained by bisecting the vertex angle of the unit element.

[0020] Equation (2)

[0021] (2R*sinθ) / P = N+a = N+2b

[0022] In Equation (2), 'P' is the regular pitch, 'N' is the number of wrinkles arranged on the outer side of the unit element at the regular pitch, 'a' is a length shorter than the regular pitch, and is the sum of the lengths between the wrinkles arranged on one side of the outer side of the unit element and the end of one side of the outer side of the unit element and the lengths between the wrinkles arranged on the other side of the outer side of the unit element and the end of the other side of the outer side of the unit element, and 'b' is half the length of 'a', and is the length between the wrinkles arranged on one or the other side of the outer side of the unit element and the end of one side of the outer side of the unit element.

[0023] Specifically, the wrinkles arranged in multiple numbers according to the regular pitch within the outer side length of the unit element may be arranged such that, if the number of wrinkles is odd, an intermediate wrinkle may be arranged at the center of the outer side of the unit element, and other wrinkles may be arranged symmetrically on both sides based on the intermediate wrinkle, and if the number of wrinkles is even, a plurality of wrinkles may be arranged symmetrically on both sides based on the center of the outer side of the unit element.

[0024] Specifically, at least the second region of the bottom portion may have different finishing members for the vertical wrinkles, the vertical wrinkles, and the horizontal wrinkles depending on the gap between the end of the vertical wrinkles of the vertical portion and the end of the vertical wrinkles of the bottom portion or between the end of the vertical wrinkles of the vertical portion and the end of the horizontal wrinkles of the bottom portion.

[0025] Specifically, considering the inner diameter of the bottom portion, the number of unit elements in the form of isosceles triangles radially divided based on the center of the bottom portion is determined, and the vertex angle of the unit element is determined according to the number of unit elements, and the gap is determined by the regular pitch, the vertex angle of the unit element, the gap between the bending point where the outer sides of the adjacently arranged unit elements face each other and at least one wrinkle adjacent to the bending point among the wrinkles of the bottom portion, and can be calculated according to the following equation (3).

[0026] Equation (3)

[0027] x = (Py) / cos 2θ

[0028] gap = yx

[0029] In equation (3), 'P' is the regular pitch, '2θ' is the vertex angle of the unit element, 'x' is the distance between the bending point where the outer sides of the unit elements arranged adjacent to each other and one of the wrinkles of the bottom part that is adjacent to the bending point, and 'y' is the distance between the bending point where the outer sides of the unit elements arranged adjacent to each other and another wrinkle of the bottom part that is adjacent to the bending point.

[0030]

[0031] According to another aspect of the present invention, a liquefied gas storage tank is a storage tank for storing liquefied gas, comprising: a primary barrier that comes into contact with the liquefied gas and forms a storage space for the liquefied gas; an insulating wall that is installed on a support structure and is provided on the outside of the primary barrier; and an inert gas treatment unit that injects an inert gas into the insulating wall or discharges the liquefied gas leaking through the insulating wall, wherein the primary barrier has a corrugation that protrudes toward the inside of the storage space, and the corrugations are provided orthogonally in a vertical portion and a bottom portion of the storage space, and the inert gas treatment unit includes a transfer line that extends from a corner portion between the vertical portion and the bottom portion toward a central portion of the bottom portion, and is installed within the corrugation of the bottom portion to transfer the inert gas toward the center of the bottom portion; and a distribution line that is connected to the transfer line, is installed within the corrugation of the bottom portion in a polygonal shape, and has a plurality of distribution holes that distribute the inert gas toward the center or the periphery.

[0032] Specifically, the inert gas treatment unit includes a first inert gas treatment unit comprising a first transfer line formed with a constant length from the corner portion toward the center portion of the bottom portion, and a first distribution line connected to the first transfer line; a second inert gas treatment unit comprising a second transfer line extending from the corner portion toward the center portion of the bottom portion, and a second distribution line connected to the second transfer line in a bending manner to one side; and a third inert gas treatment unit comprising a third transfer line provided in parallel with the second transfer line at a constant interval, extending from the corner portion toward the center portion of the bottom portion, and a third distribution line connected to the other side in a bending manner from the third transfer line, wherein the first inert gas treatment unit is provided between the second inert gas treatment unit and the third inert gas treatment unit, and the second inert gas treatment unit and the third inert gas treatment unit are arranged in plurality at a constant interval in the circumferential direction of the bottom portion.

[0033] Specifically, the first dispersion line may have a polygonal shape surrounding the center of the bottom portion, but may have a polygonal shape in the form of a closed circuit that is interconnected, the second dispersion line and the third dispersion line may have a polygonal shape surrounding the center of the bottom portion, but may have an open circuit shape that is not interconnected, and each of the second dispersion line and the third dispersion line may be formed of an outer dispersion line that is bent and connected to the end of each of the second transfer line and the third transfer line; and at least one inner injection line that is bent and connected to the middle of each of the second transfer line and the third transfer line.

[0034] Specifically, the first transfer line may be formed to be longer than the lengths of the second transfer line and the third transfer line, and the second distribution line and the third distribution line may be formed on the outside of the first distribution line.

[0035] Specifically, the storage tank includes a structure protruding from the first barrier of the bottom, and the second transfer line and the third transfer line of each of the second inert gas treatment unit and the third inert gas treatment unit can be arranged to bypass the structure without interfering with it.

[0036]

[0037] According to another aspect of the present invention, a liquefied gas storage tank comprises: a primary barrier that comes into contact with the liquefied gas and forms a storage space for the liquefied gas; an insulating wall that is installed on a support structure and is provided on the outside of the primary barrier; and an inert gas treatment unit that injects an inert gas into the insulating wall or discharges the liquefied gas leaking through the insulating wall, wherein the primary barrier has a corrugation that protrudes toward the inside of the storage space, and the corrugations are provided orthogonally in a vertical portion and a bottom portion of the storage space, and the inert gas treatment unit includes a corner line that is independently installed in a corner portion between the vertical portion and the bottom portion and that allows the inert gas to be transported from the vertical portion to the bottom portion.

[0038] Specifically, the inert gas treatment unit includes a vertical line extending from the top of the vertical section toward the bottom section and installed within the folds of the vertical section; and a horizontal line installed within the folds of the bottom section and consisting of a transfer line and a distribution line, wherein the corner line can be installed between the vertical line and the horizontal line without being connected to the vertical line and the horizontal line.

[0039] The land-based liquefied gas storage tank according to the present invention can be easily manufactured, has the effect of reducing manufacturing costs and facilitating maintenance.

[0040] FIG. 1 is a drawing for explaining a liquefied gas storage tank according to a first embodiment of the present invention.

[0041] Figure 2 is a cross-sectional view illustrating the bottom of a liquefied gas storage tank according to the first embodiment of the present invention.

[0042] Figure 3 is a cross-sectional view for explaining a vertical portion of a liquefied gas storage tank according to the first embodiment of the present invention.

[0043] Figure 4 is a partial plan view illustrating the bottom of a liquefied gas storage tank according to the first embodiment of the present invention.

[0044] FIGS. 5 to 7 are drawings for explaining the arrangement of an insulating wall installed on the bottom of a liquefied gas storage tank according to the first embodiment of the present invention, the arrangement of wrinkles in the wall, and the finishing member.

[0045] FIG. 8 is a drawing for explaining the specifications of an irregular barrier applied differently depending on the size of the peripheral area of ​​the bottom portion of a liquefied gas storage tank according to the first embodiment of the present invention.

[0046] FIG. 9 is a drawing for explaining a finishing member applied differently depending on the gap between the wrinkles of the bottom portion and the wrinkles of the vertical portion in a liquefied gas storage tank according to the first embodiment of the present invention.

[0047] Fig. 10 is a partially exploded perspective view of a corner structure of a liquefied gas storage tank according to a second embodiment of the present invention.

[0048] Fig. 11 is a front view of the corner structure of a liquefied gas storage tank according to the second embodiment of the present invention.

[0049] Fig. 12 is a cross-sectional view of the upper block of a liquefied gas storage tank according to the second embodiment of the present invention.

[0050] Fig. 13 is a cross-sectional view of the upper connection block corner structure of a liquefied gas storage tank according to the second embodiment of the present invention.

[0051] Fig. 14 is a drawing for explaining a liquefied gas storage tank according to a third embodiment of the present invention.

[0052] FIG. 15 is a drawing for explaining one embodiment of an inert gas treatment unit of a liquefied gas storage tank according to a third embodiment of the present invention.

[0053] FIG. 16 is a drawing for explaining another embodiment of an inert gas treatment unit of a liquefied gas storage tank according to a third embodiment of the present invention.

[0054] FIG. 17 is a drawing for explaining another embodiment of an inert gas treatment unit of a liquefied gas storage tank according to a third embodiment of the present invention.

[0055] Fig. 18 is a drawing for explaining a liquefied gas storage tank according to the fourth embodiment of the present invention.

[0056] Fig. 19 is a cross-sectional view of the corner structure of a liquefied gas storage tank for explaining the corner line portion shown in Fig. 18.

[0057] The purpose, 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 this specification, when reference numerals are assigned to components in each drawing, it should be noted that, where possible, identical components are assigned the same reference numerals even if they appear in different drawings. Furthermore, in describing the present invention, if a detailed description of a related known technology is deemed to unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

[0058] In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0059] Additionally, terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited in order, etc., by the terms. That is, the terms are used only for the purpose of distinguishing one component from another.

[0060] In the present specification, the liquefied gas may be LNG. The following description assumes that the liquefied gas is LNG. However, in the present invention, the liquefied gas may include, in addition to LNG, any substance (e.g., LPG, ethane, hydrogen, ammonia, etc.) that is forcibly liquefied for storage due to its boiling point being lower than room temperature and has a calorific value.

[0061] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0062]

[0063] FIG. 1 is a drawing for explaining a liquefied gas storage tank according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view for explaining a bottom portion of a liquefied gas storage tank according to a first embodiment of the present invention, FIG. 3 is a cross-sectional view for explaining a vertical portion of a liquefied gas storage tank according to a first embodiment of the present invention, and FIG. 4 is a partial plan view for explaining a bottom portion of a liquefied gas storage tank according to a first embodiment of the present invention.

[0064] In addition, FIGS. 5 to 7 are drawings for explaining the arrangement of the insulating wall installed on the bottom, the arrangement of the wrinkles of the wall, and the finishing member in the liquefied gas storage tank according to the first embodiment of the present invention, and FIG. 6 is an enlarged view of part E1 of FIG. 5, and FIG. 7 is an enlarged view of part E2 of FIG. 5.

[0065] In addition, FIG. 8 is a drawing for explaining the specifications of an irregular barrier applied differently depending on the size of the peripheral area of ​​the bottom portion in a liquefied gas storage tank according to the first embodiment of the present invention, and FIG. 9 is a drawing for explaining a finishing member applied differently depending on the gap between the corrugations of the bottom portion and the corrugations of the vertical portion in a liquefied gas storage tank according to the first embodiment of the present invention.

[0066]

[0067] Referring to FIGS. 1 to 3, a liquefied gas storage tank (1) according to the first embodiment of the present invention is mounted at a point on land or the like. At this time, the liquefied gas storage tank (1) may be a membrane type in which a bulkhead structure of a structure installed on land forms the outer surface of the tank, or may be an independent type in which the liquefied gas storage tank (1) is installed on land.

[0068] The type of the liquefied gas storage tank (1) is not particularly limited, and the location where the liquefied gas storage tank (1) is installed (on land, on the deck of a marine structure, etc.) is also not limited. However, the liquefied gas storage tank (1) of the present invention may have a structure in which an insulating layer is arranged in an inward direction.

[0069] A liquefied gas storage tank (1) has a storage space. The storage space can store liquefied gas, which may be LNG. The following description assumes that the liquefied gas is LNG. However, in the present invention, the liquefied gas may include, in addition to LNG, any substance (such as LPG, ethane, hydrogen, or ammonia) that is forcibly liquefied for storage due to its boiling point being lower than room temperature and has a calorific value.

[0070]

[0071] In this embodiment, a case is described where the liquefied gas storage tank (1) is a land-based storage tank.

[0072] A liquefied gas storage tank (1) may include an outer tank (11) formed in a cylindrical shape and an inner tank (12) installed on the inner surface and bottom of the outer tank (11).

[0073] The outer tank (11) may be formed in a cylindrical shape. The outer tank (11) forms a cylindrical tank body having a roughly dome-shaped cover by pouring concrete or the like, thereby forming the outer shape of the liquefied gas storage tank (1).

[0074] Since the inner chamber (12) is a part that comes into direct contact with liquefied gas at extremely low temperatures, it can be made of a material such as low-temperature steel that can withstand extremely low temperatures.

[0075] This inner part (12) can be composed of a vertical part (121) installed on the inner surface of the outer part (11) and a bottom part (122) installed on the bottom surface of the outer part (11).

[0076] The vertical section (121) and the bottom section (122) may be formed of an insulating wall (3, 3a, 5) that can withstand impact from the outside or impact due to liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and a barrier (2, 4) that can prevent liquefied gas from leaking to the outside, which will be described in detail below.

[0077] The vertical section (121) and the bottom section (122) may be configured to include a primary barrier (2) in contact with liquefied gas, a primary insulating wall (3) installed on the outside of the primary barrier (2), a secondary barrier (4) installed on the outside of the primary insulating wall (3), and a secondary insulating wall (5) arranged on the outside of the secondary barrier (4), as shown in FIGS. 2 and 3, and may be supported on the outer tank (11) by a mastic (6) as an adhesive member and a stud (7) as a fixing member installed between the secondary insulating wall (5) and the outer tank (11).

[0078] The vertical section (121) may be configured in the same manner as the floor section (122), but as shown in FIG. 1, the portion in contact with the floor section (122) may be configured in the same manner as the floor section (122) up to a certain height, and above a certain height, the secondary barrier (4) arranged between the primary insulation wall (3) and the secondary insulation wall (5) may be omitted.

[0079] That is, as illustrated in FIG. 3, the vertical portion (121) may be formed in a structure in which, from a certain height upward, the secondary plywood (52) of the secondary insulation wall (5), the primary insulation material (32) of the primary insulation wall (3) or the secondary insulation material (51) of the secondary insulation wall (5), the primary plywood (31) of the primary insulation wall (3), and the primary barrier wall (2) are laminated. In addition, the vertical portion (121) may omit the connecting insulation wall (3a) in the configuration of the floor portion (122) and connect neighboring unit insulation panels with panel joint members (drawing symbols not shown).

[0080]

[0081] The primary barrier (2) forms a space for containing liquefied gas, which is a cryogenic substance, and may be made of a metal material. For example, the metal material may be stainless steel, but is not limited thereto. The primary barrier (2), together with the secondary barrier (4), can prevent liquefied gas from leaking to the outside.

[0082] The primary barrier (2) can be installed so as to be fixedly connected to the upper part of the primary insulating wall (3) and come into direct contact with the liquefied gas, which is an extremely low-temperature substance stored in the liquefied gas storage tank (1).

[0083] The primary barrier (2) can be formed of a corrugated membrane sheet having lattice-shaped wrinkles.

[0084] The primary insulation wall (3) is designed to withstand impact from the outside or impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and can be installed between the primary barrier (2) and the secondary barrier (4).

[0085] The primary insulation wall (3) may have a structure in which the primary plywood (31) and the primary insulation material (32) are sequentially laminated on the outside of the primary barrier (2).

[0086] The primary plywood (31) can be installed between the primary barrier (2) and the primary insulation (32).

[0087] The primary insulation material (32) can be formed of a material with excellent insulation performance and mechanical strength, such as polyurethane foam, so as to withstand impact from the outside or impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside.

[0088] A portion of the primary insulation wall (3), the secondary barrier (4), and the secondary insulation wall (5) can be laminated to form a unit insulation panel. The unit insulation panel can be divided into a regular insulation panel having a rectangular parallelepiped shape and an irregular insulation panel having a triangular or trapezoidal plane shape and smaller than the regular insulation panel.

[0089] In the unit insulation panel, the width of the primary insulation wall (3) may be smaller than the width of the secondary insulation wall (5), which may result in a portion of the secondary barrier wall (4) being exposed on both sides of the primary insulation wall (3). The unit insulation panels may be arranged adjacently, and in this case, a connecting insulation wall (3a) may be installed in the space between the adjacent primary insulation walls (3), i.e., the space where the secondary barrier wall (4) is exposed.

[0090] The secondary barrier (4) can be divided into a main barrier (41) and an auxiliary barrier (42). The main barrier (41) is installed on top of the secondary insulation wall (5) in the unit insulation panel, and the auxiliary barrier (42) is installed between the exposed main barrier (41) and the connecting insulation wall (3a). At this time, the auxiliary barrier (42) is provided to interconnect the main barriers (41) provided in adjacent unit insulation panels. That is, the unit insulation panels arranged adjacently can be finished by the auxiliary barrier (42) and the connecting insulation wall (3a) laminated on the main barrier (41).

[0091] The connecting insulation wall (3a) can be provided in a laminated form with connecting plywood (31a) and connecting insulation material (32a).

[0092] The connecting plywood (31a) can be installed between the primary barrier (2) and the connecting insulation (32a).

[0093] The connecting insulation (32a) can be formed of polyurethane foam between the connecting plywood (31a) and the auxiliary barrier (42) of the secondary barrier (4).

[0094] The above-mentioned connecting insulation wall (3a) is installed to block heat intrusion from the outside by sealing the space created between adjacent secondary insulation walls (5) together with the auxiliary barrier (42) when unit insulation panels are placed adjacent to each other.

[0095] The secondary barrier (4) can be installed between the primary insulation wall (3) and the secondary insulation wall (5) that encompass the connecting insulation wall (3a), and together with the primary barrier (2), can prevent liquefied gas from leaking to the outside.

[0096] The secondary barrier (4) at the bottom of the unit insulation panel may include a main barrier (41) as a single barrier, and the secondary barrier (4) at the bottom of the connecting insulation wall (3a) may include a main barrier (41) that connects the unit insulation panels to each other and an auxiliary barrier (42) that is provided on the secondary insulation wall (5) that forms the unit insulation panel.

[0097] The secondary insulation wall (5) can be designed to withstand impact from the outside or impact due to liquefied gas sloshing from the inside while blocking heat intrusion from the outside together with the primary insulation wall (3) and the connecting insulation wall (3a).

[0098] The secondary insulation wall (5) can be installed between the secondary barrier (4) and the outer shell (11), and can have a structure in which the secondary insulation material (51) and the secondary plywood (52) are sequentially laminated on the outside of the secondary barrier (4).

[0099] The secondary insulation material (51) can be formed of a material with excellent insulation performance and mechanical strength, such as polyurethane foam, so as to withstand impact from the outside or impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside.

[0100] The secondary plywood (52) can be installed between the secondary insulation (51) and the outer shell (11).

[0101]

[0102] The inner tank (12) of the land-based liquefied gas storage tank (1) according to the first embodiment of the present invention is positioned along the inner circumference of the outer tank (11), forms a sealed storage space, and may be formed of polygonal columns.

[0103] That is, the vertical part (121) of the inner tank (12) of the land-based liquefied gas storage tank (1) can form a polygonal column.

[0104] At this time, the bottom part (122) can be connected to the lower end of the vertical part (121) by forming a polygon whose border corresponds to the polygonal pillar of the vertical part (121).

[0105] In this embodiment, the primary barrier (2) is described by dividing it into a regular barrier (2a), an irregular barrier (2b), and a corner barrier (2b3). Here, the irregular barrier (2b) may be an outer barrier (2b1) and an end barrier (2b2).

[0106] In addition, the grid-shaped wrinkles provided in the first barrier (2) are explained by dividing them into horizontal wrinkles (21), vertical wrinkles (22), vertical wrinkles (23), horizontal wrinkles (24), outer wrinkles (25), and end wrinkles (26).

[0107] In addition, a unit insulation panel is formed by a primary insulation wall (3) and a secondary insulation wall (5), and such a unit insulation panel is provided to correspond to the shape of the primary barrier (2). That is, when a regular barrier (2a) is applied as the primary barrier (2), a regular insulation wall (drawing symbol not shown) can be provided to correspond thereto, and when an irregular barrier (2b) is applied as the primary barrier (2), an irregular insulation wall (drawing symbol not shown) can be provided to correspond thereto.

[0108] The regular barrier (2a) may be a standardized rectangular shape. The regular barrier (2a) may be installed in the vertical section (121) and may be installed in a orthogonal arrangement in the first area (122a) of the floor section (122). That is, the regular barrier (2a) may be installed in the vertical section (121) and the first area (122a) of the floor section (122), and a regular insulating wall may be installed below the regular barrier (2a) to correspond thereto.

[0109] The irregular barrier (2b) may have various forms manufactured separately from the regular barrier (2a). The irregular barrier (2b) may be arranged and installed in the second region (122b) of the floor portion (122). Here, the second region (122b) may be an area where the irregular insulating wall and the irregular barrier (2b) are arranged between the first region (122a) and the vertical portion (121).

[0110] The outer wall (2b1) and the end wall (2b2) ​​are irregular wall (2b), and the outer wall (2b1) may be a wall disposed between the regular wall (2a) and the end wall (2b2) ​​of the first area (122a), and the end wall (2b2) ​​may be a wall disposed between the corner wall (2b3) and the outer wall (2b1). Here, the corner wall (2b3) may be a wall having a bent portion and disposed at a bent corner portion where the vertical portion (121) and the bottom portion (122) meet.

[0111] The horizontal wrinkles (21) and the vertical wrinkles (22) are wrinkles provided on a regular barrier wall (2a) arranged on the bottom (122), the vertical wrinkles (23) and the horizontal wrinkles (24) are wrinkles provided on a regular barrier wall (2a) arranged on the vertical part (121), the outer wrinkles (25) are wrinkles provided on an outer barrier wall (2b1) arranged on the second region of the bottom (122), and the end wrinkles (26) are wrinkles provided on an end barrier wall (2b2) ​​arranged on the second region of the bottom (122).

[0112] In this embodiment, the regular insulating wall formed to correspond to the regular barrier (2a) has a rectangular cross-section shape as shown in FIGS. 5 to 7, and is arranged orthogonally in the first region (122a), but can be arranged in a horizontally laid form.

[0113] With the regular insulation walls arranged as described above, irregular insulation walls can be arranged in the second region (122b) to correspond to the irregular barrier (2b). The arrangement of the irregular insulation walls can be varied. As illustrated in FIGS. 5 to 7, the irregular insulation walls can be arranged in three broad sections.

[0114] Specifically, the irregular insulation wall can be divided into a first part (drawing symbol not shown) that is arranged only in the vertical direction, a second part (drawing symbol not shown) that is arranged in a mixed vertical and horizontal direction, and a third part (drawing symbol not shown) that is arranged only in the horizontal direction.

[0115] At this time, the length occupied by the first part along the circumference direction is greater than the length occupied by the second part, and the length occupied by the second part is greater than the length occupied by the third part. Here, the length may be an arc-shaped length as a part of the circumference of the edge of the bottom part (122).

[0116] In the present embodiment, as illustrated in FIGS. 5 to 7, based on the line (a bold, step-shaped line drawn in the drawings) dividing the first region (122a) and the second region (122b), the second region (122b) corresponding to the first and second steps may be the first part, the second region (122b) corresponding to the third step may be the second part, and the second region (122b) corresponding to the remaining steps, such as the fourth step, may be the third part. The areas occupied by the first part, the second part, and the third part may vary depending on the size of the floor portion (122).

[0117]

[0118] The vertical section (121) of this embodiment forms a polygonal column, and the vertical wrinkles (23) of the primary barrier (2) can be provided in the circumferential direction.

[0119] The vertical wrinkles (23) provided on the insulation panels in the vertical section (121) can be provided at a regular pitch.

[0120] In addition, the vertical wrinkles (23) provided in the folded portion where the insulation panels are connected in the vertical section (121) may be provided with a pitch different from the regular pitch.

[0121] The bottom part (122) is formed as a polygon whose border corresponds to a polygonal pillar and is connected to the lower part of the vertical part (121), and can be divided into a first region (122a) in which regular insulation walls and regular barrier walls (2a) are arranged, and a second region (122b) in which irregular insulation walls and irregular barrier walls (2b) are arranged between the first region (122a) and the vertical part (121).

[0122] The bottom part (122) has a plurality of unit elements (UE) in the shape of isosceles triangles that are radially divided based on the center of the bottom part (122).

[0123] At least a second region (122b) of the bottom portion (122) is arranged with vertical wrinkles (22) or horizontal wrinkles (21) in parallel according to a regular pitch from a reference line (BL) passing through the center of the bottom portion (122), and the distance between the point (PT) farthest from the reference line (BL) and the outer wrinkle (25) of the outer wall (2b1) arranged closest to the point (PT) among the vertical wrinkles (22) or horizontal wrinkles (21) is calculated, and according to the calculated distance, the specifications of the outer wall (2b1) having the vertical wrinkles (22) and horizontal wrinkles (21) arranged with a regular pitch, and the specifications of the end wall (2b2) ​​connecting the outer wall (2b1) and the corner wall (2b3) having a bend portion can be determined.

[0124] In the above, the reference line (BL) may be a line passing through the center of any one of the outer sides forming the polygonal prism, which is parallel or perpendicular to the vertical fold (22) or the horizontal fold (21). Here, the outer side may be a base opposite to the vertex of an isosceles triangle forming the unit element (UE).

[0125] In this embodiment, the reference line (BL) is shown in FIG. 8 as a line passing through the center of the bottom part (122) and parallel to the vertical wrinkle (22) of the bottom part (122), but in FIG. 8, the reference line (BL) portion can become the point (PT), and the point (PT) portion can become the reference line (BL).

[0126] In the above, when the end barrier (2b2) ​​is positioned to partially overlap with the outer barrier (2b1), the end wrinkle (26) can be formed at a position corresponding to the regular pitch from the outer wrinkle (25) of the outer barrier (2b1).

[0127] In the above, the calculated distance may be the sum of the first distance (B1), which is a distance extending outward from the outer wrinkle (25) and overlapping the end barrier (2b2), the second distance (B2), which is a distance extending inward from the end wrinkle (26) and overlapping the outer barrier (2b1), and the third distance (C), which is a distance between the end wrinkle (26) and the inner surface of the vertical portion (121), as shown in FIG. 8. At this time, the calculated distance may be at least longer than the regular pitch. In FIG. 8, 'P' is the regular pitch, and 'N' is the number of wrinkles arranged on the outer side of the unit element (UE) at the regular pitch.

[0128] The outer wall (2b1) and the end wall (2b2) ​​may have specifications determined based on at least one of the first distance (B1), the second distance (B2), and the third distance (C).

[0129] The bottom part (122) has a plurality of unit elements (UE) in the form of isosceles triangles that are radially divided based on the center of the bottom part (122). At this time, the length of the outer side of the unit element (UE) can be calculated according to Equation (1). The number of unit elements (UE) of the bottom part (122) can be determined according to the length of the outer side.

[0130] Equation (1) is as follows.

[0131] A = 2(D / 2)*sin{(1 / 2)*(360° / M)}

[0132] = 2R*sin{(1 / 2)*2θ}

[0133] = 2R*sinθ

[0134] In equation (1), 'A' is the outer side length of the unit element (UE), 'D' is the inner diameter of the bottom part (122), 'M' is the number of unit elements (UE) of the bottom part (122), 'R' is the radius of the bottom part (122), '2θ' is the vertex angle of the unit element (UE), and 'θ' is an angle obtained by bisecting the vertex angle of the unit element (UE).

[0135] When the outer side length of the unit element (UE) is calculated by Equation (1), the number of vertical wrinkles (22) or horizontal wrinkles (21) arranged at a regular pitch within the outer side length of the unit element (UE) can be calculated according to Equation (2).

[0136] Equation (2) is as follows.

[0137] (2R*sinθ) / P = N+a = N+2b

[0138] In Equation (2), 'P' is a regular pitch, 'N' is the number of wrinkles arranged on the outer side of the unit element (UE) at the regular pitch, 'a' is a length shorter than the regular pitch, and is the sum of the lengths between the vertical wrinkles (22) or horizontal wrinkles (21) arranged on one side of the outer side of the unit element (UE) and one end of the outer side of the unit element (UE) and the lengths between the vertical wrinkles (22) or horizontal wrinkles (21) arranged on the other side of the outer side of the unit element (UE) and the other end of the outer side of the unit element (UE), and 'b' is half the length of 'a', and is the length between the vertical wrinkles (22) or horizontal wrinkles (21) arranged on one or the other side of the outer side of the unit element (UE) and one end of the outer side of the unit element (UE).

[0139] Depending on the odd or even number of vertical wrinkles (22) or horizontal wrinkles (21) produced by equation (2), the arrangement of vertical wrinkles (22) or horizontal wrinkles (21) on the outer side of the unit element (UE) can be determined differently.

[0140] The vertical wrinkles (22) or horizontal wrinkles (21) are arranged in multiples according to a regular pitch within the outer side length of the unit element (UE). If the number of vertical wrinkles (22) or horizontal wrinkles (21) is odd, the middle wrinkle can be arranged at the center of the outer side of the unit element (UE), and other wrinkles can be arranged symmetrically on both sides based on the middle wrinkle.

[0141] In addition, the vertical wrinkles (22) or horizontal wrinkles (21) arranged in multiple numbers according to a regular pitch within the outer side length of the unit element (UE) can be arranged in multiple numbers symmetrically on both sides with respect to the center of the outer side of the unit element (UE) as the standard, if the number of vertical wrinkles (22) or horizontal wrinkles (21) is even.

[0142] In the liquefied gas storage tank (1) of this embodiment, the number of unit elements (UE) is determined by considering the inner diameter of the bottom part (122), and at this time, the vertex angle of the unit elements (UE) is determined according to the number of unit elements (UE).

[0143] In the liquefied gas storage tank (1) of the present embodiment, the inner diameter of the bottom portion (122) and the number of unit elements (UE) are designed so that the length between the vertical wrinkles (22) or horizontal wrinkles (21) arranged on one or the other side of the outer edge of the unit element (UE) and the one or the other end of the outer edge of the unit element (UE) is within the range of 20% to 50% of the regular pitch.

[0144]

[0145] The vertical section (121) of this embodiment forms a polygonal column, and the vertical wrinkles (23) of the primary barrier (2) can be provided in the circumferential direction.

[0146] The vertical wrinkles (23) provided on the insulation panels in the vertical section (121) can be provided at a regular pitch.

[0147] In addition, the vertical wrinkles (23) provided in the folded portion where the insulation panels are connected in the vertical section (121) may be provided with a pitch different from the regular pitch.

[0148] The bottom part (122) is formed as a polygon whose border corresponds to a polygonal pillar and is connected to the lower part of the vertical part (121), and can be divided into a first region (122a) in which regular insulation walls and regular barrier walls (2a) are arranged, and a second region (122b) in which irregular insulation walls and irregular barrier walls (2b) are arranged between the first region (122a) and the vertical part (121).

[0149] The bottom part (122) has a plurality of unit elements (UE) in the shape of isosceles triangles that are radially divided based on the center of the bottom part (122).

[0150] At least the second region (122b) of the bottom portion (122) arranges vertical wrinkles (22) or horizontal wrinkles (21) in parallel according to a regular pitch from a reference line (BL) passing through the center of the bottom portion (122), and the finishing members (27) of the vertical wrinkles (23), vertical wrinkles (22), and horizontal wrinkles (21) may vary depending on the gap between the end of the vertical wrinkles (23) of the vertical portion (121) and the end of the vertical wrinkles (22) of the bottom portion (122) or between the end of the vertical wrinkles (23) of the vertical portion (121) and the end of the horizontal wrinkles (21) of the bottom portion (122).

[0151] In the above, the finishing member (27) may be a continuous folded member that finishes a portion where the pleats are connected to each other because there is no gap, or an independent finishing cover, an overlapping finishing cover, or a continuous flat member that finishes a portion where the pleats are not connected to each other because there is a gap.

[0152] The finishing member (27) selects an independent finishing cover, an overlapping finishing cover, and a continuous flat member according to the size of the gap to finish the part where the wrinkles are not connected to each other. If the size of the gap is equal to or greater than a set first interval, an independent finishing cover is applied. If the size of the gap is equal to or less than a set second interval that is narrower than the first interval, a continuous flat member is applied. If the size of the gap is between the first interval and the second interval, an overlapping finishing cover can be applied.

[0153] In this embodiment, the vertical wrinkles (23) provided on the insulation panels in the vertical section (121) can be connected to the floor section (122) using a continuous folded member as a finishing member (27), and then finished with an independent finishing cover as a finishing member (27) in the floor section (122).

[0154] In addition, the vertical folds (23) provided in the folded portion where the insulation panels are connected in the vertical portion (121) can be finished as an independent finishing cover as a finishing member (27) in the vertical portion (121).

[0155] In the liquefied gas storage tank (1) of this embodiment, the number of unit elements (UE) in the form of an isosceles triangle divided radially based on the center of the bottom part (122) is determined by considering the inner diameter of the bottom part (122). At this time, the vertex angle of the unit element (UE) is determined according to the number of unit elements (UE).

[0156] In the liquefied gas storage tank (1) of the present embodiment, the gap is determined by the regular pitch, the apex angle of the unit element (UE), the bending point (BP) where the outer sides of the adjacent unit elements (UE) face each other, and the distance between at least one vertical wrinkle (22) or horizontal wrinkle (21) adjacent to the bending point (BP) among the vertical wrinkles (22) or horizontal wrinkles (21) of the bottom portion (122).

[0157] The gap determined in this way can be calculated according to equation (3).

[0158] Equation (3) is as follows.

[0159] x = (Py) / cos 2θ

[0160] gap = yx

[0161] In equation (3), 'P' is a normal pitch, '2θ' is a vertex angle of a unit element (UE), 'x' is a gap between a bending point (BP) where the outer side of a unit element (UE) arranged adjacent to it faces, and one of the vertical wrinkles (22) or horizontal wrinkles (21) adjacent to the bending point (BP) among the vertical wrinkles (22) or horizontal wrinkles (21) of the bottom portion (122), and 'y' is a gap between a bending point (BP) where the outer side of a unit element (UE) arranged adjacent to it faces, and another of the vertical wrinkles (22) or horizontal wrinkles (21) adjacent to the bending point (BP) among the vertical wrinkles (22) or horizontal wrinkles (21) of the bottom portion (122).

[0162]

[0163] A corner structure is applied to the periphery of the bottom portion of the liquefied gas storage tank (1) according to the first embodiment described above. The corner structure is described with reference to FIGS. 10 to 13.

[0164] FIG. 10 is a partially exploded perspective view of a corner structure of a liquefied gas storage tank according to a second embodiment of the present invention, FIG. 11 is a front view of a corner structure of a liquefied gas storage tank according to a second embodiment of the present invention, FIG. 12 is a cross-sectional view of an upper block of a liquefied gas storage tank according to a second embodiment of the present invention, and FIG. 13 is a cross-sectional view of a corner structure of an upper connecting block of a liquefied gas storage tank according to a second embodiment of the present invention.

[0165] Referring to FIGS. 10 to 13, the corner structure of the liquefied gas storage tank (1) may be formed by a combination of a plurality of corner blocks (CB). A plurality of flat blocks may be connected to a plurality of corner blocks (CB) at the corner portion of the liquefied gas storage tank (1).

[0166] A corner block (CB) may be composed of a lower block (LB) fixed to a hull (7), an upper block (UUB) bonded to the lower block (LB) and having a width narrower than the front, rear, left, and right width of the lower block (LB), and an upper connecting block (UBB) provided between the upper blocks (UUB) arranged adjacently.

[0167] The lower block (LB) may have an upper block (UUB) and an upper connection block (UBB) installed on the upper surface, and may be composed of a corner secondary barrier (41b) bonded to the lower surface of the upper block (UUB), a corner connection barrier (42b) bonded to the lower surface of the upper connection block (UBB) and connecting the adjacent corner secondary barriers (41b) when the lower blocks (LB) are arranged adjacently, and a corner secondary insulation wall (5b) including an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b).

[0168] The corner secondary insulation wall (5b) may include an outer first fixing part (5b1) and an outer second fixing part (5b2) which are respectively fixed to the inner side of the first side and the second side and are configured with a structure in which an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b) are sequentially laminated. The outer first fixing part (5b1) may be fixed to the inner side of the first side, and the outer second fixing part (5b2) may be fixed to the inner side of the second side.

[0169]

[0170] The upper block (UUB) may be bonded to the lower block (LB) and may be formed of a single board having a width narrower than the front-rear, left-right, and right-left widths of the lower block (LB). The upper block (UUB) may be formed by arranging multiple unit upper blocks (UB1, UB2, UB3, UB4) adjacent to each other and in parallel.

[0171] The upper block (UUB) may be provided with a barrier fixing member (21b) in which a plurality of unit barrier fixing members (21b1, 21b2, 21b3, 21b4) are independently arranged in parallel and adjacent to each other in a portion corresponding to each of the plurality of unit upper blocks (UB1, UB2, UB3, UB4).

[0172] The upper block (UUB) may be formed of a corner primary insulation wall (3b) including an inner first fixing part (3b1) and an inner second fixing part (3b2) in which an inner primary plywood (31b), a corner primary insulation material (32b), and an outer primary plywood (33b) are sequentially laminated on the outside of the barrier fixing part (21b). The inner first fixing part (3b1) and the inner second fixing part (3b2) may be provided symmetrically with respect to a direction (ED) that equally divides the corner portion. The inner first and second fixing parts (3b1, 3b2) may be fixed by a plurality of unit barrier fixing parts (21b1, 21b2, 21b3, 21b4).

[0173] The inner first fixing part (3b1) may be fixed to the outer first fixing part (5b1) and provided on the inner side of the first surface, and the inner second fixing part (3b2) may be fixed to the outer second fixing part (5b2) and provided on the inner side of the second surface. In addition, the corner first insulating wall (3b) may include an inner bent part (3b3) formed by filling an insulating material between the inner first fixing part (3b1) and the inner second fixing part (3b2).

[0174] When a plurality of corner blocks (CB) are adjacently arranged along the edge of a corner portion where the first and second sides at different angles face each other, an inner bend portion (3b3) can be formed in the space portion between the adjacent inner first and second fixing members (3b1, 3b2), i.e., in the space portion where the corner secondary barrier (41b) is exposed.

[0175] A space may be created between the sides of the inner first and second fixing members (3b1, 3b2) that are in close contact with the two sides of the inner bending member (3b3), and a corner inner packing material (3b8) may be installed in this space to prevent heat convection.

[0176] The upper block (UUB) may include a plurality of upper slits (SL1) formed at a certain depth on the upper portion to prepare for shrinkage and expansion stress of the corner primary insulation wall (3b). The upper slits (SL1) may be formed to penetrate the inner primary plywood (31b), which is the upper layer of the corner primary insulation wall (3b), and at least a portion of the corner primary insulation material (32b), which is the middle layer.

[0177] The upper slit (SL1) can be formed at a corresponding position between a plurality of unit barrier fixing members (21b1, 21b2, 21b3, 21b4) installed on the upper surface of the upper block (UUB) of each corresponding portion of a plurality of unit upper blocks (UB1, UB2, UB3, UB4) forming an existing upper block.

[0178] On one upper block (UUB), a barrier fixing member (21b) composed of a plurality of unit barrier fixing members (21b1, 21b2, 21b3, 21b4) can be installed. Each of the unit barrier fixing members (21b1, 21b2, 21b3, 21b4) can be installed adjacent to each other and parallel to the upper portion of a corner primary insulation wall (3b) forming the upper block (UUB) made of a metal material, and can be bent at a predetermined angle on the inner side of the first and second surfaces, for example, can be bent at the same angle as the angle formed by the first and second surfaces at different angles forming a storage space for accommodating liquefied gas.

[0179] The corner primary barrier is fixedly connected to the corner primary insulation wall (3b) by a barrier fixing member (21b) installed on the upper part of the corner primary insulation wall (3b). The corner primary barrier may be used to mean a barrier fixing member (21b), etc.

[0180]

[0181] The upper connecting block (UBB) is connected to the upper surface of the adjacent lower block (LB). The upper connecting block (UBB) can be installed in the space exposed between the adjacent upper blocks (UUB).

[0182] The upper connecting block (UBB) may be formed of a corner connecting insulation wall (34b) arranged on the outside of the barrier fixing member (21b). The corner connecting insulation wall (34b) of the upper connecting block (UBB) may be installed between the barrier fixing member (21b) and the corner connecting insulation wall (42b).

[0183] These corner connecting insulation walls (34b) are provided on the inner sides of the first and second sides, respectively, and may include a corner first connecting fixing member (34b1) and a corner second connecting fixing member (34b2) configured in a structure in which a corner first connecting plywood (342b), a corner connecting insulation material (341b), and a corner second connecting plywood (343b) are sequentially laminated on the outer side of a corner first barrier fixing member (21b) to which the corner first barrier is fixed.

[0184] The corner connecting insulation wall (34b) is installed in the corner space between the first corner connecting fixing part (34b1) and the second corner connecting fixing part (34b2), and may include a corner connecting bending part (34b3) made of insulating material.

[0185] A corner inner packing material (34b4) is inserted and installed in the space between the first and second corner connecting fixing parts (34b1, 34b2). The corner inner packing material (34b4) may be the same as or similar to the corner inner packing material (3b8) inserted and installed in the space between the first and second inner fixing parts (3b1, 3b2).

[0186] When an upper connecting block (UBB) is installed between adjacent integrated upper blocks (UUB), a step space (SS) may be created between the inner first and second fixing members (3b1, 3b2) and the corner first and second connecting members (34b1, 34b2). A stuffing piece (SP) may be inserted into the step space (SS).

[0187]

[0188] FIG. 14 is a drawing for explaining a liquefied gas storage tank according to a third embodiment of the present invention, FIG. 15 is a drawing for explaining an embodiment of an inert gas treatment unit of a liquefied gas storage tank according to a third embodiment of the present invention, FIG. 16 is a drawing for explaining another embodiment of an inert gas treatment unit of a liquefied gas storage tank according to a third embodiment of the present invention, and FIG. 17 is a drawing for explaining yet another embodiment of an inert gas treatment unit of a liquefied gas storage tank according to a third embodiment of the present invention.

[0189] Referring to FIGS. 14 to 17, a liquefied gas storage tank (1) according to a third embodiment of the present invention may include a primary barrier (2) that comes into contact with liquefied gas and forms a storage space for liquefied gas, an insulating wall installed on a support structure and provided on the outside of the primary barrier (2), and an inert gas treatment unit (100) that injects an inert gas into the insulating wall or discharges liquefied gas leaking through the insulating wall.

[0190] The liquefied gas storage tank (1) according to the third embodiment of the present invention may be a land-based liquefied gas storage tank (1) including an outer tank (11) formed in a cylindrical shape, like the liquefied gas storage tank (1) of the second embodiment described above, and an inner tank (12) installed on the inner surface and bottom of the outer tank (11).

[0191] In the above, the outer tank (11) may be formed in a cylindrical shape, and a cylindrical tank body having a roughly dome-shaped cover may be formed by pouring concrete or the like to form the outer shape of the liquefied gas storage tank (1).

[0192] In the above, the inner part (12) may include a vertical part (121) installed on the inner surface of the outer part (11) and a bottom part (122) installed on the bottom surface of the outer part (11).

[0193] The floor portion (122) and the vertical portion (121) from the floor portion (122) to a certain height may include a primary barrier (2), a primary insulation wall (3) in which primary plywood (31) and primary insulation material (32) are sequentially laminated on the outside of the primary barrier (2), a secondary barrier (4) installed on the outside of the primary insulation wall (3), and a secondary insulation wall (5) in which secondary insulation material (51) and secondary plywood (52) are sequentially laminated on the outside of the secondary barrier (4).

[0194] In addition, the vertical portion (121) positioned above a certain height from the floor portion (122) may include a primary barrier (2), a primary plywood (31) of a primary insulation wall (3) provided on the outside of the primary barrier (2), one of the primary insulation material (32) of the primary insulation wall (3) provided on the outside of the primary plywood (31) or the secondary insulation material (51) of the secondary insulation wall (5), and a secondary plywood (52) of the secondary insulation wall (5) provided on the outside of the insulation material.

[0195] The primary barrier (2) according to the third embodiment of the present invention has wrinkles (21, 22, 23, 24) protruding toward the inside of the storage space, and the wrinkles (21, 22, 23, 24) can be provided in an orthogonal manner in the vertical portion (121) and the bottom portion (122) of the storage space.

[0196] The support structure according to the third embodiment of the present invention may be the outer tank (11) of the liquefied gas storage tank (1) described above.

[0197] According to the third embodiment of the present invention, the insulating wall may be an insulating wall including a primary barrier (2) in a floor portion (122) and a vertical portion (121) from the floor portion (122) to a certain height, a primary insulating wall (3) in which a primary plywood (31) and a primary insulating material (32) are sequentially laminated on the outside of the primary insulating wall (2), a secondary insulating wall (4) installed on the outside of the primary insulating wall (3), and a secondary insulating wall (5) in which a secondary insulating material (51) and a secondary plywood (52) are sequentially laminated on the outside of the secondary insulating wall (4).

[0198] In addition, the insulating wall according to the third embodiment of the present invention may be an insulating wall including a primary barrier (2) in a vertical portion (121) positioned at a certain height or higher from the floor portion (122), a primary plywood (31) of a primary insulating wall (3) provided on the outside of the primary barrier (2), one of the primary insulating material (32) of the primary insulating wall (3) provided on the outside of the primary plywood (31) or the secondary insulating material (51) of the secondary insulating wall (5), and a secondary plywood (52) of the secondary insulating wall (5) provided on the outside of the insulating material.

[0199] An inert gas treatment unit (100) according to a third embodiment of the present invention is a device that determines whether the primary barrier (2) is damaged by filling an inert gas such as nitrogen in an insulating space between the primary barrier (2) and the secondary barrier (4), and may include an injection unit (110), a flow path unit (120), and an exhaust unit (130).

[0200] The inert gas treatment unit (100) of this embodiment is installed in an insulating space, which is a space between the primary barrier (2) and the secondary barrier (4), so as to evenly distribute the inert gas, thereby enabling accurate detection of damage to the primary barrier (2), preventing fire and explosion due to leakage, and preventing corrosion due to condensation of water vapor.

[0201] In the above, the injection unit (110) is provided on the outside of the storage tank (1) and can inject an inert gas.

[0202] In the above, the euro section (120) can transfer the inert gas injected from the injection section (110) to the bottom section (122) and disperse it into the interior of the wrinkles (21, 22, 23, 24), and can include an injection line (IPL), a vertical line (VL), a horizontal line (HL), a corner line (CL), and an exhaust line (OPL).

[0203] The injection line (IPL) is connected to the injection part (110) at the top of the vertical part (121) and extends to the inside of the fold (23) of the vertical part (121), and can transport the inert gas into the inside of the storage tank (1).

[0204] The vertical line (VL) is connected to the injection line (IPL) and extends from the top of the vertical section (121) toward the bottom section (122), and can be installed within the wrinkle (23) of the vertical section (121).

[0205] The vertical line (VL) is connected to the injection line (IPL) and extends from the top of the vertical section (121) toward the bottom section (122), and can be installed within the wrinkle (23) of the vertical section (121).

[0206] A horizontal line (HL) may be composed of at least one transfer line and at least one distribution line. These transfer lines and distribution lines will be described later.

[0207] The corner line (CL) is installed to connect the vertical line (VL) and the horizontal line (HL) at the corner portion between the vertical portion (121) and the bottom portion (122), and can allow the inert gas to be transported from the vertical portion (121) to the bottom portion (122).

[0208] The discharge line (OPL) is connected to the discharge section (130) at the top of the vertical section (121) so that the inert gas dispersed into the interior of the folds (21, 22, 23, 24) and the leaked liquefied gas can be transported to the outside of the storage tank (1).

[0209] In the above, the discharge unit (130) is provided on the outside of the storage tank (1) and can discharge the inert gas dispersed into the inside of the wrinkles (21, 22, 23, 24) and the leaked liquefied gas to the outside.

[0210] Hereinafter, with reference to FIGS. 15 to 17, at least one transfer line and at least one distribution line forming a horizontal line (HL), which are components of an inert gas treatment unit (100), will be specifically described.

[0211] Here, at least one transfer line is a line extending from a corner portion between the vertical portion (121) and the bottom portion (122) toward the center portion of the bottom portion (122), and is installed within the folds (21, 22) of the bottom portion (122) to transfer the inert gas toward the center of the bottom portion (122). The at least one transfer line is a first to third transfer line (HLT1, HLT2, HLT3) as illustrated in FIGS. 15 to 17, and it should be noted that the terms first to third do not denote the order or quantity, but are intended to distinguish components.

[0212] In addition, at least one or more distribution lines may be connected to at least one or more transfer lines, installed in the folds (21, 22) of the bottom portion (122) in a polygonal shape, and provided with a plurality of distribution holes (indicated by arrows in the drawing) for distributing the inert gas toward the center or the periphery. The at least one or more distribution lines are first to third distribution lines (HLD1, HLD2, HLD3) as illustrated in FIGS. 15 to 17, and it should be noted that the terms first to third do not denote the order or quantity, but are intended to distinguish components.

[0213] The above-mentioned first to third transfer lines (HLT1, HLT2, HLT3) and first to third distribution lines (HLD1, HLD2, HLD3) may be provided by connecting a plurality of main pipes with connecting pipes, although not specifically illustrated.

[0214] In the above, the connecting pipe may be at least one of an 'I'-shaped connecting pipe, an 'L'-shaped connecting pipe, and a 'T'-shaped connecting pipe.

[0215] The connecting pipe can be fixed to the upper surface of the insulating wall with a fixed support (not shown).

[0216] As mentioned above, fixed supports are not applied to all connecting pipes and can be installed when necessary.

[0217] For example, the fixed support may be fixed on one side of an 'L'-shaped connecting pipe by welding or the like, and on the other side of the upper surface of the insulating wall by bolting or the like. In this embodiment, the fixed support is described as being installed on an 'L'-shaped connecting pipe, but it is of course possible to install it on an 'I'-shaped connecting pipe or a 'T'-shaped connecting pipe as needed.

[0218] At least one fixed support may be installed in a vertical line (VL). In this case, the fixed support may be a different type of fixed support from the above-mentioned fixed support applied to the connecting pipe.

[0219] In addition, the main pipe is fixedly installed on the insulating wall (3) by a guiding support (not shown), but can be installed so as to be able to slide to respond to shrinkage and relaxation in the longitudinal direction due to temperature changes.

[0220] At this time, the connecting pipe may be connected to the main pipe so as to be adhesively fixed, or may be slidably connected to at least one of the main pipes.

[0221] Among the multiple main pipes, the main pipes used in the first to third transfer lines (HLT1, HLT2, HLT3) may not be provided with a distribution hole for dispersing the inert gas. However, if necessary, a distribution hole may be provided in the first to third transfer lines (HLT1, HLT2, HLT3).

[0222] Among the plurality of main pipes, the main pipes used in the first to third distribution lines (HLD1, HLD2, HLD3) may be provided with distribution holes (indicated by arrows) for dispersing inert gas. The distribution holes may be provided on one or both sides of the main pipe.

[0223] Referring to FIG. 15, the inert gas treatment unit (100) of the present invention may include a first inert gas treatment unit formed of a first transfer line (HLT1) formed with a constant length from a corner portion toward a central portion of a bottom portion (122), and a first distribution line (HLD1) formed in a polygonal shape that is connected to the first transfer line (HLT1) and surrounds the central portion of the bottom portion (122).

[0224] In this case, the first transfer line (HLT1) can be formed with a certain length from the corner portion toward the center portion of the bottom portion (122) by connecting the main pipes in which no distribution holes are provided.

[0225] The first distribution line (HLD1) may be formed in a polygonal shape in a closed circuit form by connecting main pipes provided with distribution holes to each other and surrounding the central portion of the bottom portion (122). The distribution holes of the first distribution line (HLD1) may be provided in the main pipe so as to distribute the inert gas in the central and peripheral directions.

[0226] In addition, referring to FIG. 16, the inert gas treatment unit (100) of the present invention may include a second inert gas treatment unit comprising a second transfer line (HLT2) extending from a corner portion toward a central portion of a bottom portion (122), a second distribution line (HLD2) connected to one side by being bent from the second transfer line (HLT2), and a third inert gas treatment unit comprising a third transfer line (HLT3) provided in parallel with the second transfer line (HLT2) at a predetermined interval and extending from the corner portion toward a central portion of the bottom portion (122), and a third distribution line (HLT3) connected to the other side by being bent from the third transfer line (HLT3).

[0227] The above-mentioned second inert gas treatment unit and third inert gas treatment unit have a symmetrical structure except that the bending directions of the second distribution line (HLD2) and the third distribution line (HLD3) are opposite, and can be arranged in a plurality of groups at a certain interval in the circumferential direction of the bottom part (122). For example, the second inert gas treatment unit and the third inert gas treatment unit can be arranged in a first grouping form in the direction of the center on the left side of the bottom part (122), in a second grouping form in the direction of the center on the upper side of the bottom part (122), in a third grouping form in the direction of the center on the right side of the bottom part (122), and in a fourth grouping form in the direction of the center on the lower side of the bottom part (122).

[0228] At this time, the second distribution line (HLD2) of the plurality of second inert gas treatment units and the third distribution line (HLD3) of the plurality of third inert gas treatment units may form a polygonal shape surrounding the central portion of the bottom portion (122), but may form a polygonal shape in the form of an open circuit that is not interconnected.

[0229] In this embodiment, each of the second distribution lines (HLD2) of the plurality of second inert gas treatment units and the third distribution lines (HLD3) of the plurality of third inert gas treatment units may be formed as outer distribution lines that are bent and connected to the ends of each of the second transfer lines (HLT2) and the third transfer lines (HLT3).

[0230] That is, the second distribution line (HLD2) of the plurality of second inert gas treatment units may be a second-first distribution line (HLD2-1) that is bent and connected to one side at the end of the second transfer line (HLT2) as an outer distribution line.

[0231] In addition, the third distribution line (HLD3) of the plurality of third inert gas treatment units may be a third-1 distribution line (HLD3-1) that is bent and connected to the other side from the end of the third transfer line (HLT3) as an outer distribution line.

[0232] In addition, in the present embodiment, each of the second distribution lines (HLD2) of the plurality of second inert gas treatment units and the third distribution lines (HLD3) of the plurality of third inert gas treatment units may be formed of an outer distribution line that is bent and connected to the end of each of the second transfer lines (HLT2) and the third transfer lines (HLT3), and at least one inner injection line that is bent and connected to the middle of each of the second transfer lines (HLT2) and the third transfer lines (HLT3).

[0233] That is, the second distribution line (HLD2) of the plurality of second inert gas treatment units may be a second-first distribution line (HLD2-1) that is connected to one side by being bent at the end of the second transfer line (HLT2) as an outer distribution line, and at least one second-second distribution line (HLD2-2) that is connected to one side by being bent at the middle of the second transfer line (HLT2) as an inner distribution line.

[0234] In addition, the third distribution line (HLD3) of the plurality of third inert gas treatment units may be a third-first distribution line (HLD3-1) that is connected to the other side by being bent at the end of the third transfer line (HLT3) as an outer distribution line, and at least one third-second distribution line (HLD3-2) that is connected to the other side by being bent at the middle of the third transfer line (HLT3) as an inner distribution line.

[0235] In addition, the inert gas treatment unit (100) of the present invention may further include an end cap (not shown) installed at the end of a main pipe forming a second distribution line (HLD2) of a plurality of second inert gas treatment units and a third distribution line (HLD3) of a plurality of third inert gas treatment units.

[0236] The above end cap is configured to seal the end of the main pipe, but is provided with a hole similar to a distribution hole so that an inert gas can be distributed into the interior of the folds (21, 22 23, 24).

[0237] Referring again to FIG. 16, the inert gas treatment unit (100) of the present invention comprises a first transfer line (HLT1) formed with a constant length from the corner portion shown in FIG. 15 toward the center portion of the bottom portion (122), and a first distribution line (HLD1) connected to the first transfer line (HLT1) and formed in a polygonal shape surrounding the center portion of the bottom portion (122). The first inert gas treatment unit may be provided between the second inert gas treatment unit and the third inert gas treatment unit described above.

[0238] At this time, the first transfer line (HLT1) of the first inert gas treatment unit may be formed longer than the lengths of the second transfer line (HLT2) and the third transfer line (HLT3) of the second inert gas treatment unit and the third inert gas treatment unit, respectively.

[0239] Additionally, the second distribution line (HLD2) and the third distribution line (HLD3) of each of the second inert gas treatment unit and the third inert gas treatment unit may be formed outside the first distribution line (HLD1) of the first inert gas treatment unit.

[0240]

[0241] Referring to Fig. 17, a liquefied gas storage tank (1) may have a structure protruding from the primary barrier (2) of the bottom (122), for example, a pump tower (8).

[0242] At this time, the second transfer line (HLT2) and the third transfer line (HLT3) of each of the second inert gas treatment unit and the third inert gas treatment unit described above can be arranged to bypass the pump tower (8), which is a protruding structure, without interfering with it.

[0243]

[0244] FIG. 18 is a drawing for explaining a liquefied gas storage tank according to a fourth embodiment of the present invention, and FIG. 19 is a cross-sectional view of a corner structure of a liquefied gas storage tank for explaining a corner line portion shown in FIG. 18.

[0245] Referring to FIGS. 18 and 19, a liquefied gas storage tank (1) according to a fourth embodiment of the present invention may include a primary barrier (2) that comes into contact with liquefied gas and forms a storage space for liquefied gas, an insulating wall installed on a support structure and provided on the outside of the primary barrier (2), and an inert gas treatment unit (100) that injects an inert gas into the insulating wall or discharges liquefied gas leaking through the insulating wall.

[0246] The liquefied gas storage tank (1) according to the fourth embodiment of the present invention may be a land-based liquefied gas storage tank (1) like the liquefied gas storage tank (1) of the second or third embodiment described above, and a detailed description thereof will be omitted here to avoid redundant description.

[0247] The primary barrier (2) according to the fourth embodiment of the present invention has wrinkles (21, 22, 23, 24) protruding toward the inside of the storage space, and the wrinkles (21, 22, 23, 24) can be provided in an orthogonal manner in the vertical portion (121) and the bottom portion (122) of the storage space.

[0248] The support structure according to the fourth embodiment of the present invention may be an outer tank (11) of the liquefied gas storage tank (1) described above.

[0249] According to the fourth embodiment of the present invention, the insulating wall may be an insulating wall including a primary barrier (2) in a floor portion (122) and a vertical portion (121) from the floor portion (122) to a certain height, a primary insulating wall (3) in which a primary plywood (31) and a primary insulating material (32) are sequentially laminated on the outside of the primary insulating wall (2), a secondary insulating wall (4) installed on the outside of the primary insulating wall (3), and a secondary insulating wall (5) in which a secondary insulating material (51) and a secondary plywood (52) are sequentially laminated on the outside of the secondary insulating wall (4).

[0250] In addition, the insulating wall according to the fourth embodiment of the present invention may be an insulating wall including a primary barrier (2) in a vertical portion (121) located at a certain height or higher from the floor portion (122), a primary plywood (31) of a primary insulating wall (3) provided on the outside of the primary barrier (2), one of the primary insulating material (32) of the primary insulating wall (3) provided on the outside of the primary plywood (31) or the secondary insulating material (51) of the secondary insulating wall (5), and a secondary plywood (52) of the secondary insulating wall (5) provided on the outside of the insulating material.

[0251] An inert gas treatment unit (100) according to a fourth embodiment of the present invention is a device that determines whether the primary barrier (2) is damaged by filling an inert gas such as nitrogen in an insulating space between the primary barrier (2) and the secondary barrier (4), and may include an injection unit (110), a flow path unit (120), and a discharge unit (130). The injection unit (110) and the discharge unit (130) are identical or similar to the injection unit (110) and the discharge unit (130) of the third embodiment described above, and thus a detailed description thereof will be omitted here.

[0252] The inert gas treatment unit (100) of this embodiment is installed in an insulating space, which is a space between the primary barrier (2) and the secondary barrier (4), so as to evenly distribute the inert gas, thereby enabling accurate detection of damage to the primary barrier (2), preventing fire and explosion due to leakage, and preventing corrosion due to condensation of water vapor.

[0253] However, the euro section (120) according to the fourth embodiment of the present invention may have a different configuration from the euro section (120) according to the third embodiment of the present invention described above, and thus, the euro section (120) having a different configuration from the third embodiment will be mainly described.

[0254] In the above, the euro section (120) can transfer the inert gas injected from the injection section (110) to the bottom section (122) and disperse it into the interior of the wrinkles (21, 22, 23, 24), and can include an injection line (IPL), a vertical line (VL), a horizontal line (HL), a corner line (CL), and an exhaust line (OPL).

[0255] The injection line (IPL), like the injection line (IPL) of the third embodiment, is connected to the injection part (110) at the top of the vertical part (121) and extends to the inside of the fold (23) of the vertical part (121), and can transport the inert gas into the inside of the storage tank (1).

[0256] The vertical line (VL) is connected to the injection line (IPL) and extends from the top of the vertical section (121) toward the bottom section (122), and can be installed within the wrinkle (23) of the vertical section (121). Unlike the vertical line (VL) of the third embodiment, the vertical line (VL) of the fourth embodiment is not directly connected to the corner line (CL).

[0257] The horizontal line (HL) is installed within the folds (21, 22) of the bottom portion (122) and may be composed of a transfer line (HLT) and a distribution line (HLD). Here, the transfer line (HLT) and the distribution line (HLD) are the same as or similar to the transfer line (HLT) and the distribution line (HLD) of the fourth embodiment described above, so a detailed description thereof will be omitted to avoid redundant explanation.

[0258] However, among the horizontal lines (HL) of the fourth embodiment, the transfer line (HLT) is not directly connected to the corner line (CL), unlike the transfer line (HLT) of the third embodiment.

[0259] The corner line (CL) is independently installed at the corner portion between the vertical portion (121) and the bottom portion (122), and can allow an inert gas to be transported from the vertical portion (121) to the bottom portion (122). The corner line (CL) will be described later.

[0260] The discharge line (OPL), like the discharge line (OPL) of the third embodiment, is connected to the discharge section (130) at the top of the vertical section (121) so that the inert gas dispersed into the interior of the folds (21, 22, 23, 24) and the leaked liquefied gas can be transported to the outside of the storage tank (1).

[0261] Below, the corner line (CL) of the fourth embodiment described above is specifically described.

[0262] As described above, the corner line (CL) of the fourth embodiment, unlike the corner line (CL) of the third embodiment, may be provided independently without being directly connected to the transfer line (HLT) of the vertical line (VL) and the horizontal line (HL).

[0263] These corner lines (CL) can be installed between the vertical line (VL) and the horizontal line (HL) without being connected to the vertical line (VL) and the horizontal line (HL), and can include a vertical opening line (CL1), a horizontal opening line (CL2), and a bending line (CL3).

[0264] The vertical opening line (CL1) can be installed within the wrinkle (23) of the vertical section (121) at a certain distance from the vertical line (VL).

[0265] The horizontal opening line (CL2) can be installed within the wrinkles (21, 22) of the bottom portion (122) at a certain distance from the horizontal line (HL).

[0266] The bending line (CL3) can be placed in the path between the vertical opening line (CL1) and the horizontal opening line (CL2).

[0267] In the above, the bending line (CL3) can be formed as a curved line that combines a straight line and a curved line.

[0268] For example, the bending line (CL3) can be inserted and installed in a groove (SPH) formed in the insulating wall (3), as illustrated in FIG. 19, and can be formed as a curved line in which a first straight line (CL3-1), a second straight line (CL3-2), a third straight line (CL3-3), a first curved line (CL3-4), and a second curved line (CL3-5) are combined.

[0269] The first straight line (CL3-1) can be connected to the vertical opening line (CL1) and extended into the interior of the insulating wall (3).

[0270] The third straight line (CL3-3) can be connected to the horizontal opening line (CL2) and extended into the interior of the insulating wall (3).

[0271] The second straight line (CL3-2) can connect the first straight line (CL3-1) and the third straight line (CL3-3).

[0272] The first curved line (CL3-4) can connect the first straight line (CL3-1) and the second straight line (CL3-2).

[0273] The second curved line (CL3-5) can connect the second straight line (CL3-2) and the third straight line (CL3-3).

[0274] The above-mentioned bending line (CL3) can be formed as an integral or separate first straight line (CL3-1), second straight line (CL3-2), third straight line (CL3-3), first curved line (CL3-4), and second curved line (CL3-5).

[0275] In this embodiment, the bending line (CL3) is described as a curved line formed by combining multiple straight lines and multiple curved lines, but it is of course possible to form a curved line formed by combining multiple straight lines or a curved line formed by combining multiple curved lines having different radii of curvature.

[0276] Additionally, the bending line (CL3) can be fixed by at least one fixing member while being inserted into a groove formed in the primary insulation wall (3) of the corner portion.

[0277] In the above, the fixed member may be a member capable of fixing a bending line, such as an 'L' shape, inside the groove, and may be installed on the inner wall of the groove, but is not limited thereto.

[0278] A liquefied gas storage tank (1) according to a fourth embodiment of the present invention may include a lower block (LB) formed of a single board and provided on the inner side of the first and second surfaces at different angles, which are the same as or similar to the liquefied gas storage tank (1) according to the second embodiment, an upper block (UUB) bonded to a corner secondary barrier (41b) of the lower block (LB), and a corner block (CB) bonded to a corner secondary barrier (41b) on the upper surface of the lower block (LB) arranged adjacent to it to connect the lower blocks (LB).

[0279] At this time, the bending line (CL3) can be installed by inserting it into the step space (SS) between the upper block (UUB) and the upper connecting block (UBB).

[0280] In addition, the liquefied gas storage tank (1) according to the fourth embodiment of the present invention may further include a stuffing piece (SP) inserted into a stepped space (SS) between the upper block (UUB) and the upper connecting block (UBB) in the same or similar manner as the liquefied gas storage tank (1) according to the second embodiment.

[0281] In the above, the stuffing piece (SP) is formed to correspond to the shape of the step space (SS), but in the part where the bending line (CL3) is installed, the upper part can be removed so that the upper part corresponds to the curved shape of the bending line (CL3).

[0282]

[0283] Although the present invention has been described above with reference to embodiments thereof, these are merely examples and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various combinations, modifications, and applications not illustrated in the embodiments are possible without departing from the essential technical contents of the embodiments. Accordingly, technical contents related to modifications and applications that can be easily derived from the embodiments of the present invention should be construed as being included in the present invention.

Claims

1. A liquefied gas storage tank including an outer tank and an inner tank, The above inner part is composed of a vertical part installed on the inner surface of the outer part and a bottom part installed on the bottom surface of the outer part. The above vertical section and the above floor section are composed of an insulating wall and a barrier wall installed on the insulating wall and having a grid-shaped wrinkle, The above vertical section, It forms a polygonal pillar, and the vertical wrinkles of the above-mentioned barrier are arranged in a circumferential direction. The above floor part, The frame is formed as a polygon corresponding to the polygonal pillar and connected to the lower end of the vertical section, and is divided into a first region in which regular insulating walls and regular barriers are arranged, and a second region in which irregular insulating walls and irregular barriers are arranged between the first region and the vertical section. At least the second region of the above floor, A liquefied gas storage tank in which vertical or horizontal wrinkles are arranged parallel to each other according to a regular pitch from a reference line passing through the center of the above-mentioned bottom part.

2. In the first paragraph, at least the second region of the bottom part, Calculate the distance between the point farthest from the above reference line and the outer wrinkle of the outer wall that is placed closest to the point among the above vertical wrinkles or the above horizontal wrinkles, A liquefied gas storage tank, wherein the specifications of the outer wall having the vertical and horizontal wrinkles arranged in the regular pitch and the specifications of the end wall connecting the corner wall having the folded portion and the outer wall are determined according to the calculated distance.

3. In the first paragraph, the barrier installed on the floor is are arranged orthogonally, The above baseline is, A liquefied gas storage tank passing through the center of one of the outer edges forming the polygonal pillar that is parallel or perpendicular to the vertical wrinkles or the horizontal wrinkles.

4. In the second paragraph, the end barrier, When positioned to overlap with the outer wall, an end wrinkle is formed at a position corresponding to the regular pitch from the outer wrinkle of the outer wall, The above distance is, A liquefied gas storage tank, wherein the distance is the sum of a first distance, which is a distance extending outward from the outer wrinkle and overlapping the end barrier, a second distance, which is a distance extending inward from the end wrinkle and overlapping the outer barrier, and a third distance, which is a distance between the end wrinkle and the inner surface of the vertical portion, and is at least longer than the regular pitch.

5. In paragraph 1, the bottom part is, It has multiple unit elements in the shape of isosceles triangles that are divided radially based on the center of the above floor, The length of the outer side of the unit element is calculated according to the following equation (1), The number of wrinkles arranged at the regular pitch within the outer side length of the unit element is calculated according to the following equation (2), A liquefied gas storage tank in which the arrangement of wrinkles on the outer edge of the unit element is determined differently depending on the odd or even number of the wrinkles. Equation (1) A = 2(D / 2)*sin{(1 / 2)*(360° / M)} = 2R*sin{(1 / 2)*2θ} = 2R*sinθ In equation (1), 'A' is the outer side length of the unit element, 'D' is the inner diameter of the bottom, 'M' is the number of the unit elements of the bottom, 'R' is the radius of the bottom, '2θ' is the vertex angle of the unit element, and 'θ' is an angle obtained by bisecting the vertex angle of the unit element. Equation (2) (2R*sinθ) / P = N+a = N+2b In Equation (2), 'P' is the regular pitch, 'N' is the number of wrinkles arranged on the outer side of the unit element at the regular pitch, 'a' is a length shorter than the regular pitch, and is the sum of the lengths between the wrinkle arranged on one side of the outer side of the unit element and the end of one side of the outer side of the unit element and the lengths between the wrinkle arranged on the other side of the outer side of the unit element and the end of the other side of the outer side of the unit element, and 'b' is half the length of 'a', and is the length between the wrinkle arranged on one or the other side of the outer side of the unit element and the end of one side of the outer side of the unit element.

6. In the fifth paragraph, the wrinkles arranged in multiple numbers according to the regular pitch within the outer side length of the unit element are If the number of the above wrinkles is odd, the middle wrinkle is placed in the center of the outer side of the unit element, and other wrinkles are placed symmetrically on both sides based on the middle wrinkle. A liquefied gas storage tank in which, if the number of wrinkles above is an even number, a plurality of wrinkles are arranged symmetrically on both sides based on the center of the outer edge of the unit element.

7. In the first paragraph, at least the second region of the bottom part, A liquefied gas storage tank, wherein the finishing members of the vertical wrinkles, the vertical wrinkles, and the horizontal wrinkles are different depending on the gap between the end of the vertical wrinkles of the vertical portion and the end of the vertical wrinkles of the bottom portion or between the end of the vertical wrinkles of the vertical portion and the end of the horizontal wrinkles of the bottom portion.

8. In paragraph 7, Considering the inner diameter of the above floor, the number of unit elements in the form of isosceles triangles divided radially based on the center of the above floor is determined, The vertex angle of the unit element is determined according to the number of the unit elements. The above gap is, The above regular pitch, the vertex angle of the unit element, the gap between the fold point where the outer sides of the adjacently arranged unit elements face each other and at least one wrinkle adjacent to the fold point among the wrinkles of the bottom part, is determined by the above, A liquefied gas storage tank, calculated according to the following equation (3). Equation (3) x = (Py) / cos 2θ gap = yx In Equation (3), 'P' is the normal pitch, '2θ' is the vertex angle of the unit element, 'x' is the interval between the bending point where the outer sides of the unit elements arranged adjacent to each other face each other and one of the wrinkles of the floor portion that is adjacent to the bending point, and 'y' is the interval between the bending point where the outer sides of the unit elements arranged adjacent to each other face each other and another wrinkle of the floor portion that is adjacent to the bending point.

9. As a storage tank for storing liquefied gas, A primary barrier that comes into contact with the liquefied gas and forms a storage space for the liquefied gas; An insulating wall installed on a support structure and provided on the outside of the first barrier; and It includes an inert gas treatment unit that injects an inert gas into the insulating wall or discharges the liquefied gas leaking through the insulating wall. The above first barrier is, It has wrinkles protruding toward the inside of the storage space, and the wrinkles are provided orthogonally in the vertical and bottom portions of the storage space. The above inert gas treatment unit is, A transfer line extending from a corner portion between the vertical portion and the floor portion toward the center portion of the floor portion and installed within the folds of the floor portion to transfer the inert gas toward the center portion of the floor portion; and A liquefied gas storage tank, comprising a distribution line connected to the above-mentioned transfer line, installed in the above-mentioned wrinkles of the bottom part in a polygonal shape, and provided with a plurality of distribution holes for dispersing the inert gas in a central or peripheral direction.

10. In paragraph 9, the inert gas treatment unit, A first inert gas treatment unit comprising a first transfer line formed with a constant length from the corner portion toward the center portion of the bottom portion, and a first distribution line connected to the first transfer line; A second inert gas treatment unit comprising a second transfer line extending from the corner portion toward the center portion of the bottom portion, and a second distribution line connected to one side by bending from the second transfer line; and A third inert gas treatment unit is provided, which is arranged parallel to the second transfer line at a certain interval and extends from the corner portion toward the center portion of the bottom portion, and which is formed by a third distribution line that is connected to the other side by being bent from the third transfer line. The above first inert gas treatment unit is, Provided between the second inert gas treatment unit and the third inert gas treatment unit, The second inert gas treatment unit and the third inert gas treatment unit are, A plurality of liquefied gas storage tanks arranged at regular intervals in the circumferential direction of the above floor 11. In the 10th paragraph, the first distribution line, A polygonal shape surrounding the central part of the above floor is formed, and the polygonal shape is a closed circuit shape that is interconnected. The above second distribution line and the above third distribution line, A polygonal shape surrounding the central part of the above floor is formed, but is a polygonal shape in the form of an open circuit that is not interconnected. Each of the second distribution line and the third distribution line, An outer distribution line that is bent and connected to the end of each of the second transfer line and the third transfer line; and A liquefied gas storage tank comprising at least one inner injection line bent and connected to the middle portion of each of the second transfer line and the third transfer line.

12. In paragraph 10, the first transfer line, It is formed longer than the length of the second transfer line and the third transfer line, The above second distribution line and the above third distribution line, A liquefied gas storage tank formed on the outside of the first distribution line.

13. In paragraph 12, the storage tank, Including a structure protruding from the first barrier of the above floor, The second transfer line and the third transfer line of each of the second inert gas treatment unit and the third inert gas treatment unit, A liquefied gas storage tank arranged so as not to interfere with the above structure.

14. A storage tank for storing liquefied gas, A primary barrier that comes into contact with the liquefied gas and forms a storage space for the liquefied gas; An insulating wall installed on a support structure and provided on the outside of the first barrier; and It includes an inert gas treatment unit that injects an inert gas into the insulating wall or discharges the liquefied gas leaking through the insulating wall. The above first barrier is, It has wrinkles protruding toward the inside of the storage space, and the wrinkles are provided orthogonally in the vertical and bottom portions of the storage space. The above inert gas treatment unit is, A liquefied gas storage tank, comprising a corner line independently installed at a corner portion between the vertical portion and the bottom portion, and allowing the inert gas to be transported from the vertical portion to the bottom portion.

15. In paragraph 14, the inert gas treatment unit, A vertical line extending from the top of the vertical portion toward the bottom portion and installed within the wrinkles of the vertical portion; and It includes a horizontal line installed within the above-mentioned folds of the above-mentioned floor and consisting of a conveying line and a dispersing line, The above corner line is, A liquefied gas storage tank installed between the vertical line and the horizontal line without being connected to the vertical line and the horizontal line.

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