KR102335583B1 - liquefied gas tank and ship having the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and a ship including the same. The liquefied gas storage tank comprises: a wall which includes a primary barrier made of metal for forming a storage space for accommodating liquefied gas, a primary insulating wall disposed on the outside of the primary barrier, a secondary barrier provided on the outside of the primary insulating wall, and a secondary insulating wall disposed on the outside of the secondary barrier, and forms an insulating space between the first barrier and the second barrier, and in the outside of the second barrier; and a dome provided on the wall forming an upper surface of the storage space to finish the insulating space. The dome includes: an outer wall having a predetermined height above the storage space; an upper wall supported by the outer wall and having an inner end connected to the primary barrier; a support extending downward from the upper wall on the inner side of the outer wall; and a connection barrier sealing a gap between the secondary barrier and the support. The support has a vertical portion which is located on an outer side in comparison to the secondary barrier and parallel to the outer wall. The secondary insulating wall is provided with a chamfer portion inclined toward the vertical portion at an upper end. In the connection barrier, a lower end is fixed to the secondary barrier located in the chamfer portion and an upper end is bent inward compared to the lower end and fixed to the vertical portion. Therefore, the present invention can ensure the sealing to the insulating space.

Description

Liquefied gas storage tank and ship including the same {liquefied gas tank and ship having the same}

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

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

LNG in ships that transport or store liquefied gas such as LNG at sea, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), and LNG FSRU (Floating Storage and Regasification Unit) A liquefied gas storage tank (referred to as a "cargo hold") is installed to store the liquefied gas in a cryogenic liquid state.

In the liquefied gas storage tank, boil off gas (BOG) can be generated by heat intrusion from the outside, and the natural vaporization rate (BOR), which is the vaporization rate of the boil-off gas, is lowered through an adiabatic design. This is the core technology of the design of the liquefied gas storage tank.

Accordingly, such a liquefied gas storage tank may have at least two layers of insulation space, and an Interbarrier Space (IBS) and an Insulation Space (IS) are provided in the outward direction based on the space in which the LNG is stored.

In addition, the liquefied gas storage tank has a dome formed on the upper surface for loading/unloading of LNG. However, the dome can be applied with a structure to secure insulation performance by supplying nitrogen gas to the inside of the IBS while sealing the IBS and IS. In the efficient structure of the dome for sealing and insulation, continuous research and development has been is losing

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to provide a liquefied gas storage tank capable of stably sealing a barrier and a ship including the same.

A liquefied gas storage tank according to an aspect of the present invention includes a primary barrier made of a metal material forming a storage space for accommodating liquefied gas, a primary insulating wall disposed outside the primary barrier, and the primary thermal insulation A secondary barrier provided on the outside of the wall and a secondary heat insulating wall disposed outside the secondary barrier, wherein the insulating space is formed between the primary barrier and the secondary barrier and outside the secondary barrier. a wall that does; and a dome provided on the wall forming the upper surface of the storage space to close the insulating space, wherein the dome includes: an outer wall having a predetermined height above the storage space; an upper wall supported by the outer wall and connected to an inner end of the primary barrier; a support extending downwardly from the upper wall on the inner side of the outer wall; and a connection barrier sealing between the secondary barrier and the support, wherein the support is located outside the secondary barrier and has a vertical portion parallel to the outer wall, and the secondary insulating wall is at the top A chamfer inclined toward the vertical portion is provided, and the connecting barrier has a lower end fixed to the secondary barrier located in the chamfer portion and an upper end bent inward compared to the lower end to be fixed to the vertical portion.

Specifically, the connection barrier may be bent at an acute angle inward between the chamfer portion and the vertical portion.

Specifically, the support may be disposed so that the lower end of the vertical portion is spaced apart upward compared to the secondary heat insulating wall.

Specifically, the dome is fixed to the inside of the vertical portion and has an inner insulation material having an inner surface parallel to the inner surface of the secondary barrier, and the inner insulation material has an outer surface of the vertical portion of the support and the secondary insulation wall It may have a vertical surface and an inclined surface corresponding to the chamfer.

A ship according to an aspect of the present invention is characterized in that it includes the liquefied gas storage tank.

The liquefied gas storage tank and the ship including the same according to the present invention can ensure the sealing of the insulating space by securing a structure that implements efficient and stable fixing to the secondary barrier, etc.

In addition, the liquefied gas storage tank and the ship including the same according to the present invention, since the connection barrier is connected to one side of the secondary barrier, the insulating material, the support, etc. and fixed, it is possible to maintain the airtightness of the liquefied gas.

1 is a partial perspective view of a liquefied gas storage tank according to the present invention.
2 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.
3 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.
4 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention.
5 is a partial cross-sectional view of a liquefied gas storage tank according to a fourth embodiment of the present invention.
6 is a partial cross-sectional view of a liquefied gas storage tank according to a fifth embodiment of the present invention.
7 is a partial cross-sectional view of a liquefied gas storage tank according to a sixth embodiment of the present invention.
8 is a partial cross-sectional view of a liquefied gas storage tank according to a seventh embodiment of the present invention.

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

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

For reference, the present invention includes a ship equipped with a liquefied gas storage tank to be described below. At this time, the ship may be a ship that uses at least liquefied gas as a propulsion fuel/power generation fuel, and it is a concept that includes all gas carriers, merchant ships that transport cargo or people other than gas, FSRUs, FPSOs, bunkering vessels, and offshore plants. .

Hereinafter, each embodiment will be described with reference to each drawing, but with reference to FIG. 1 first, things that the embodiments have in common will be first described.

1 is a partial perspective view of a liquefied gas storage tank according to the present invention.

The liquefied gas storage tank 1 of the present invention is mounted on a hull (not shown). In this case, the liquefied gas storage tank 1 may be of a membrane type in which the bulkhead structure of the hull forms the outer wall 21 of the tank, or may be an independent type in which the liquefied gas storage tank 1 is introduced into the hull internal space.

The type of the liquefied gas storage tank (1) is not particularly limited, and the position at which the liquefied gas storage tank (1) is mounted on the hull (inboard or outboard such as the upper deck) is also not limited. However, the liquefied gas storage tank 1 of the present invention may have a structure in which a heat insulating layer is disposed in an inner direction.

For reference, in this specification, the liquefied gas storage tank 1 will be described assuming that it is a membrane type in which a heat insulating layer is directly constructed on the bulkhead of the hull. However, it should be noted that the liquefied gas storage tank 1 may be provided as an independent type, and the expression hull in the following may be interpreted by replacing the outer body of the liquefied gas storage tank 1 .

The liquefied gas storage tank 1 has a storage space. Liquefied gas may be stored in the storage space, and the liquefied gas may be LNG. Hereinafter, it is assumed that the liquefied gas is LNG, but in the present invention, the liquefied gas is forced to liquefy for storage because its boiling point is lower than room temperature, in addition to LNG, and encompasses all substances (LPG, ethane, hydrogen, ammonia, etc.) can do.

The storage space of the liquefied gas storage tank (1) may form a closed space surrounded by the wall (10). However, an opening (not shown) is provided on the upper surface of the wall 10 for the inflow and outflow of the liquefied gas, and a dome 20 is installed in the opening. That is, the liquefied gas storage tank 1 may include a wall 10 and a dome 20 .

The wall 10 forms a storage space for accommodating the liquefied gas and also forms an insulating space. Specifically, the wall 10 has a primary barrier 11 , a primary heat insulating wall 12 , a secondary barrier 13 , and a secondary insulating wall 14 from the inside to the outside. For reference, in this specification, the inside means the direction toward the inside of the space in which the liquefied gas is stored, and the outside means the opposite direction.

The primary barrier 11 forms a storage space for accommodating the liquefied gas. The primary barrier 11 may be made of a metal material to suppress brittle fracture caused by low-temperature liquefied gas, and is made of, for example, SUS, INVAR, or the like.

In addition, in order to prepare for sloshing in the primary barrier 11, a corrugated or uneven structure may be formed. As these primary barriers 11 are overlapped with each other and sealed by welding or the like, the entire storage space (except the dome 20 part) is made into a closed space.

The primary barrier 11 has a function as a barrier to prevent leakage of liquefied gas. In addition, since the secondary barrier 13 to be described later also serves as a barrier for preventing leakage of the liquefied gas, the liquefied gas storage tank 1 of the present invention has a structure that at least doubles the leakage prevention.

The primary thermal insulation wall 12 is disposed on the outside of the primary barrier 11 and implements the primary thermal insulation function. The primary insulating wall 12 may have a form in which a plywood 121 and an insulating block 122 are stacked. The plywood 121 is provided on the inside in the primary heat insulating wall 12, and an anchoring unit (not shown) is fixed to the plywood 121 . The anchoring unit is a configuration provided for overlap welding of the primary barrier 11 and may be made of the same/similar metal material as the primary barrier 11 .

The insulating block 122 is provided on the outside of the primary insulating wall 12 and has thermal insulation properties. The insulating block 122 may be made of a polyurethane foam block, or a box block in which the insulating material is accommodated. The insulating block 122 may be bonded and fixed to the secondary barrier 13 to be described later by bonding or the like, or it may be fixed to the hull by bolting or the like.

The primary insulating wall 12 is disposed in the closed space between the primary barrier 11 and the secondary barrier 13, and the space in which the primary insulating wall 12 is arranged may form an insulating space, The insulating space in which the insulating wall 12 is disposed may be referred to as an Interbarrier Space (IBS).

The primary insulating wall 12 provided at the highest position may be located below the upper wall 22 of the dome coaming 20a to be described later. This is because the connection barrier 24 must be constructed for sealing between the upper wall 22 and the secondary barrier 13 of the dome coaming 20a.

That is, according to the construction sequence, the secondary barrier 13 is provided on the secondary thermal insulation wall 14 and the primary thermal insulation wall 12 is provided in the secondary barrier 13, the uppermost primary thermal insulation wall ( 12) is positioned below the upper wall 22 to expose a portion of the secondary barrier 13. At this time, as the connecting barrier 24 is installed between the exposed secondary barrier 13 and the upper wall 22 , the dome coaming 20a and the secondary barrier 13 are mutually sealed and connected.

Thereafter, the finished insulating wall 12a may be filled in the gap between the uppermost primary insulating wall 12 and the upper wall 22 of the dome coaming 20a to cover the connection barrier 24 . The finished insulating wall 12a may have a structure including a plywood (not shown) and an insulating block (not shown) in the same/similar manner to the primary insulating wall 12 .

The inner surfaces of the primary insulating wall 12 and the finished insulating wall 12a may be provided side by side, and the primary barrier 11 on the inner surface of the primary insulating wall 12 and the finishing insulating wall 12a. ) can be installed.

The secondary barrier 13 is provided outside the primary heat insulating wall 12 . The secondary barrier 13 has a sealing function to prevent leakage of liquefied gas together with the primary barrier 11, and the secondary barrier 13 prevents leakage of liquefied gas when the primary barrier 11 is damaged. will prevent

The secondary barrier 13 may be made of the same/similar metal material as the primary barrier 11 , or may be made of a material different from that of the primary barrier 11 . For example, the secondary barrier 13 may be formed of a composite sheet in which a glass fiber sheet is laminated on both sides of a metal sheet or, conversely, a composite sheet in which a metal sheet is laminated on both sides of the glass fiber sheet. Alternatively, the secondary barrier 13 may be made of a metal material such as SUS or INVAR.

The secondary barrier 13 may be laminated on the secondary thermal insulation wall 14 . However, in order to seal the gap between the secondary insulating walls 14, a separate secondary barrier 13 is stacked, and the secondary barrier 13 on the secondary insulating wall 14 is made of a relatively rigid material and , the secondary barrier 13 between the secondary insulating walls 14 may be made of a relatively flexible material in preparation for contraction and expansion.

The secondary heat insulating wall 14 is arrange|positioned on the outer side of the secondary barrier 13. As shown in FIG. The secondary thermal insulation wall 14 has a thermal insulation function like the primary thermal insulation wall 12, and has a structure in which the plywood 141 and the thermal insulation block 142 are laminated in the same/similar manner to the primary thermal insulation wall 12. is done

However, the stacking order of the plywood 141 and the insulating block 142 of the secondary insulating wall 14 may be opposite to that of the primary insulating wall 12 . The primary insulating wall 12 is provided on the inner surface of the plywood 121 provided with an anchoring unit for welding fixing of the primary barrier 11, while the secondary insulating wall 14 is for fixing to the hull side. The plywood 141 may be provided on the outer surface.

The secondary heat insulation wall 14 may be fixed to the inner surface of the hull using a bolt (not shown), and may also be fixed using a mastic 143 . The mastic 143 is an adhesive and fixes the plywood 141 of the secondary heat insulating wall 14 to the hull.

The secondary thermal insulation wall 14 is disposed within the closed space between the secondary barrier 13 and the hull, and the space in which the secondary thermal insulation wall 14 is arranged may be referred to as an IS (Insulation Space) as a secondary thermal insulation space. have.

That is, the wall 10 goes from the inside to the outside in the order of the primary barrier 11 - IBS (primary insulating wall 12) - secondary barrier 13 - IS (secondary insulating wall 14) - hull. It is provided to be laminated, and the insulating space of IBS and IS is closed by a dome 20 to be described later.

As such, the storage space of the liquefied gas storage tank 1 can be formed by the wall 10 having the double barrier and the double insulating wall (insulation space). The wall 10 is made up of a flat surface, a curved surface, an inclined surface, etc. to form a storage space of various shapes.

The dome 20 is provided on the wall 10 forming the upper surface of the storage space. The wall 10 forming the storage space has an open upper surface for the inflow and outflow of liquefied gas or boil-off gas, and a dome 20 is installed in the opened portion to finish.

In this case, the wall 10 constituting the upper surface of the storage space may be provided to protrude upward at a predetermined height from the opened portion to form a protrusion (not shown), and a dome 20 may be installed at the upper end of the protrusion.

The dome 20 closes the insulating space formed in the wall 10 . The insulating space is provided on the inside and outside of the secondary barrier 13 in the wall 10 as described above, and the dome 20 can be closed to separate each insulating space from each other.

The dome 20 includes a dome coaming 20a that is fixedly installed on the wall 10 extending upward from the upper surface of the storage space. The dome coaming 20a is provided in the form of a hollow column and may have, for example, a square column shape.

The dome coaming 20a can be a closed space while the IBS and the IS are separated from each other through a specific structure to be described later. of inflow and outflow can be implemented.

A dome cover (not shown) may be provided above the dome coaming 20a. The dome cover may be disposed such that a line through which liquefied gas or boil-off gas can flow in and out, and the upper end of the pump tower (not shown) is fixedly installed on the dome cover.

Hereinafter, the structure of the dome 20 of each embodiment will be described in detail with reference to FIG. 2 and the like. However, it should be noted that the structure of the dome 20 described below is the structure of the dome coaming 20a.

For reference, in the following description of the second embodiment, it is to be mainly described that the embodiment is different from the previous content, and the omitted part is replaced with the previous content.

2 to 8 are partial cross-sectional views of the liquefied gas storage tank according to the present invention, and Figures 2 to 8 show the first to seventh embodiments, respectively.

2 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.

2, the dome 20 of the liquefied gas storage tank 1 according to the first embodiment of the present invention has an outer wall 21, an upper wall 22, a support 23, and a connection barrier 24. include

The outer wall 21 has a predetermined height above the storage space. The outer wall 21 may be provided in parallel with the outer surface of the protrusion, and may be integrally fixed with the hull. It is also possible that a portion of the hull is provided to replace the outer wall 21 .

The outer wall 21 may be provided in the form of a polygonal column, and may be provided so that lines pass through each side thereof. However, lines for supplying nitrogen to the insulating space/discharging nitrogen from the insulating space may be provided opposite each other in the dome coaming 20a.

A horizontal reinforcement 211 may be provided on the outside of the outer wall 21 . According to the height at which the outer wall 21 extends upward, the structural strength of the dome coaming 20a is secured by adding a reinforcing material 211 around the outer periphery of the outer wall 21 .

In this case, the reinforcement 211 may be disposed between the trunk deck and the upper wall 22 of the hull. Of course, when the height of the outer wall 21 extending between the trunk deck and the upper wall 22 is not high, the reinforcing material 211 may be omitted, and the trunk deck may serve as the reinforcing material 211 .

The upper wall 22 is supported by the outer wall 21 and at least a part of the dome cover is seated thereon. The upper wall 22 may be configured to be vertically fixed to the upper end of the outer wall 21 , and may be provided horizontally and parallel to the wall 10 constituting the upper surface of the storage space.

The upper wall 22 may be provided in a shape protruding to the outside of the outer wall 21 , and a dome cover may be inserted therein. In addition, the width of the upper wall 22 may be provided to be at least equal to or greater than the thickness of the wall 10 , thereby covering the insulating spaces of the wall 10 .

The outer end of the upper wall 22 is provided to protrude outward compared to the outer wall 21, and a vertical web member (not shown), etc. is provided between the upper wall 22 and the reinforcing material 211 to increase structural strength. .

A primary barrier 11 may be connected to the inner side of the upper wall 22 . To this end, a first step removing means 221 is provided at the inner end of the upper wall 22 . The first step removing means 221 may be a structure having a U-shape consisting of an upper surface and a lower surface and a vertical surface therebetween, and the upper surface may be superimposed on the inner end of the upper wall 22 and fixed.

However, since the height of the primary step removing means 221 may be greater than the thickness of the upper wall 22, the fixing end 222 is provided to firmly fix the first step removing means 221 to the inner end of the upper wall 22. can be used The fixed end 222 extends downward from the inner end of the upper wall 22 , so that both the upper and lower surfaces of the first step removing means 221 are fixed to the upper wall 22 .

The support 23 extends downward from the upper wall 22 outside the outer wall 21 and inside. The support 23 is used to separate the inner insulation space IBS of the secondary barrier 13 and the outer insulation space IS of the secondary barrier 13 when covering the insulation spaces through the upper wall 22 . can

The support 23 is connected to the secondary barrier 13 through a connection barrier 24 to be described later, and the outer insulating space of the secondary barrier 13 communicates with the outside of the support 23 and the secondary barrier 13 The inner insulation space of the is communicated with the inner side of the support (23). However, since the upper end of the support 23 is fixed to the upper wall 22 , the support 23 divides the insulating space in the inner and outer directions.

The support 23 has a vertical portion 231 and an inclined portion 232 . The vertical portion 231 is provided to extend downward from the lower surface of the upper wall 22 . At this time, the vertical portion 231 is provided parallel to the secondary barrier 13 from the outside compared to the secondary barrier 13 and is provided parallel to the outer wall 21 from the inside compared to the outer wall 21 .

In order to secure a stable structure when the dome cover through which various lines pass is seated on the dome coaming 20a , the support 23 may extend downward from the upper wall 22 at a point outside the secondary barrier 13 . At this time, in order to seal the outer insulating space of the secondary barrier 13 by interconnecting the support 23 and the secondary barrier 13 , the present embodiment may include an inclined portion 232 on the support 23 .

The inclined portion 232 is provided under the support 23 and inclined at an acute angle. Specifically, the inclined portion 232 is provided to be inclined inwardly from the lower end of the vertical portion 231 downward, and the inclination angle forms an acute angle compared to the case where the vertical portion 231 is further extended.

The inclined portion 232 extends to a point adjacent to the secondary barrier 13, but the lower end of the inclined portion 232 and the secondary heat insulating wall 14 are disposed to be spaced apart in the vertical direction to prevent mutual interference during installation. can be prevented The extent to which the inclined portion 232 extends downward may be determined according to the material (particularly, the degree to which it can be bent) of the connection barrier 24 to be described later.

A connection barrier 24 may be fixed to the inner surface of the inclined portion 232 , and an inner heat insulating material 26 may be fixed thereto. Conversely, the outer surface of the inclined portion 232 is provided with an outer insulating material 25, which will be described later.

The connection barrier 24 separates the insulating space inside and outside the secondary barrier 13 by sealing between the secondary barrier 13 and the support 23 . The connection barrier 24 may be made of the same/similar material as the secondary barrier 13 , but may be made of a flexible material compared to the secondary barrier 13 provided on the secondary heat insulating wall 14 .

The connection barrier 24 may be made of a material that can be bent during installation, and for example, the connection barrier 24 may be made of a composite sheet in which glass fiber sheets are laminated on both sides of a metal sheet.

The lower end of the connection barrier 24 may be fixed to the secondary barrier 13 , and the upper end may be bent outwardly compared to the lower end and fixed to the inclined portion 232 . For example, the operator may first fix the lower end of the connection barrier 24 to the secondary barrier 13 , then fold the upper end to the outside to attach and fix the lower end of the connection barrier 24 to the inclined portion 232 by bonding or the like.

The lower end of the connection barrier 24 is located above the height of the primary thermal insulation wall 12 , so that the primary thermal insulation wall 12 can be fixed to the secondary barrier 13 before construction of the connection barrier 24 . . Of course, the end insulation wall 12a may be constructed and finished on the connection barrier 24 constructed above the primary insulation wall 12 as described above.

For reference, it should be noted that the expression "bent" in the present specification includes not only forming a curved surface without forming a vertex, but also bending to form a vertex.

Although the connection barrier 24 is made of a relatively flexible material and can be provided to be bent, when the degree of curvature of the connection barrier 24 reaches a right angle, stress may be concentrated at the curved corner of the connection barrier 24 . In addition, there is also a risk that the connection barrier 24 itself is torn. Moreover, when the dome coaming 20a forms a polygonal column, it becomes very difficult to join the connecting barrier 24 at the corner portion.

Therefore, in the present invention, the support 23 is provided with the inclined portion 232, so that the degree of bending of the connection barrier 24 does not reach a right angle but forms an acute angle, and the stress is concentrated on a specific part in the connection barrier 24 can be prevented from becoming

In this embodiment, it has been described that the lower end of the inclined portion 232 of the support 23 and the secondary insulating wall 14 may be spaced apart, and the connection barrier 24 is the secondary barrier 13 and the inclined portion 232 . ) may be provided to be bent at an acute angle toward the outside in the spaced apart space between.

In this case, the outer insulating material 25 may be provided on the outside of the curved portion of the connection barrier 24 . The inner surface of the outer insulating material 25 facing the connection barrier 24 may be provided in a curved shape so that the connection barrier 24 can be smoothly bent without bending to support the curved portion of the connection barrier 24 .

The space in which the outer insulating material 25 is provided is an outer insulating space of the secondary barrier 13 and may be filled with a non-explosive gas such as nitrogen. For reference, the internal pressure may be set in the order of IS > storage > IBS, but is not limited thereto.

The outer heat insulating material 25 is filled between the outer wall 21 and the support 23 . At least a portion of the outer insulating material 25 may be provided in parallel with the secondary thermal insulation wall 14 , and may implement a secondary thermal insulation function together with the secondary thermal insulation wall 14 . However, the outer insulation 25 may be made of the same/similar material or a different material as the secondary insulation wall 14, for example, the outer insulation 25 may be made of glass wool, reinforced polyurethane foam, or the like.

The outer insulating material 25 is filled in the space between the support 23 and the outer wall 21 , and may have a height extending from the upper wall 22 to the lower end of the support 23 . That is, the lower end of the outer heat insulating material 25 may be positioned below the inclined portion 232 to contact the secondary heat insulating wall 14 .

The outer insulating material 25 may be divided into at least two in consideration of construction efficiency, etc., may be integrated after construction, and may be partially made of different materials. For example, the outer portion of the support 24 of the outer insulation 25 may be provided with glass wool, and the lower portion of the support 24 of the outer insulation 25 may be provided with polyurethane foam or the like.

The inner surface of the outer part of the support 24 of the outer heat insulating material 25 has a vertical surface and an inclined surface corresponding to the support 23 . That is, a portion of the inner surface facing the vertical portion 231 of the support 23 in the outer insulating material 25 is provided in the form of a vertical surface, and a portion of the inner surface facing the inclined portion 232 of the support 23 is in the form of an inclined surface. can be provided.

In addition, in the outer insulating material 25 , the portion located between the lower end of the inclined portion 232 and the secondary insulating wall 14 has a rectangular outer portion and an inner surface having a curved surface so that the inner surface supports the curved portion of the connection barrier 24 . The parts may be formed in a combined form. That is, in the portion where the support 23 and the secondary insulation wall 14 are spaced apart, the outer insulation 25 has a shape that protrudes inward compared to the inclined portion 232 so as to support the bent portion of the connection barrier 24 . It may have, and may be provided in a form divided into two or more for efficiency of construction, etc.

The inner heat insulating material 26 is fixed to the inside of the vertical portion 231 and has an inner surface parallel to the inner surface of the secondary barrier 13 or the connecting barrier 24 . The inner heat insulating material 26 may be provided to ensure a flat surface for installation of the finished heat insulating wall 12a by compensating for the vertical portion 231 of the support 23 being biased outward compared to the secondary barrier 13. .

The inner heat insulating material 26 may be made of a material in which wood is overlapped in multiple layers, and may be fixed to the vertical portion 231 with a mastic 261 as described for the secondary heat insulating wall 14 . The mastic 261 may be applied to the vertical portion 231 and the inclined portion 232 .

In addition, in order to fix the position of the inner heat insulating material 26 firmly, the vertical portion 231 may be provided with a stud 2311 in the inward direction, and the inner heat insulating material 26 has the stud 2311 through and on the stud 2311. A fixture 262 (such as a nut) to be fixed may be used.

The inner heat insulating material 26 has a vertical surface and an inclined surface corresponding to the outer surface of the support (23). That is, the inner heat insulating material 26 fills the space provided between the extended outer surface and the support 23 when the outer surface of the primary heat insulation wall 12 laminated and installed on the inner surface of the secondary barrier 13 is extended upward. can have

In addition, the inner heat insulating material 26 may be applied between the first step removing means 221 and the vertical portion 231 of the support 23 , and the like. The inner heat insulating material 26 may be provided in various ways to make the lower end of the upper wall 22 and the inner portion of the support 23 in a rectangular shape to install the finished heat insulating wall 12a, and may be partially made of different materials. can For example, the inner insulation 26 fixed to the vertical portion 231 and the inclined portion 232 of the support 23 is provided with a wood material to secure fixing force, and the inner insulation 26 fixed to the lower surface of the upper wall 22 . ) may be made of a polyurethane material for insulation effect.

As such, in this embodiment, in the dome coaming 20a, the support 23 is placed at the lower end of the upper wall 22 and the secondary barrier 13) and the support 23, but by applying a structure in which the connection barrier 24 is bent at an acute angle to the support 23 and fixed by bonding, the durability, gas-tight and sealing function of the connection barrier 24 can guarantee

In addition, since the connection barrier 24 is bent only at an acute angle less than a right angle, more bonding sections can be secured in comparison with a case where the connection barrier 24 is bent at a right angle, thereby increasing the stability of the sealing.

3 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.

Referring to FIG. 3 , the liquefied gas storage tank 1 according to the second embodiment of the present invention applies the same inclination as described in FIG. 2 , but is inclined to the secondary insulating wall 14 rather than the support 23 . There is a difference in that it is prepared.

The support 23 of the present embodiment is provided to include the vertical portion 231 , and the inclined portion 232 may not be provided. At this time, the secondary heat insulating wall 14 is provided with a chamfer portion 146 at the upper end facing the support 23 .

The chamfer part 146 is provided to be inclined toward the vertical part 231 from the upper end of the secondary insulating wall 14, and forms a shape in which the corner of the insulating block 142 of the secondary insulating wall 14 is cut out. can

In this case, the upper end of the chamfer part 146 may be provided to be positioned relatively parallel to the vertical part 231 of the support 23 in the vertical direction, and the secondary barrier 13 provided in the secondary heat insulating wall 14 . The silver is provided to cover at least a portion of the chamfer portion 146 .

Of course, unlike this, the secondary barrier 13 is not provided on the chamfer part 146, but only on the inner surface perpendicular to the secondary heat insulating wall 14, and the upper end of the connection barrier 24 is fixed to the support 23 and The lower end extends to the vertical inner surface of the secondary insulating wall 14, is bent inward between the support 23 and the secondary insulating wall 14, and covers the chamfered part 146 while covering the chamfered part 146. It is also possible to be sealed to the secondary barrier 13 by bending outward from the lower end of the. In this case, the connection barrier 24 may be divided into two or more and have a structure connected to each other by sealing.

In the present embodiment, the connecting barrier 24 is fixed to the vertical portion 231 having a lower end fixed to the secondary barrier 13 located in the chamfered portion 146 and curved inwardly compared to the lower end. In other words, the upper end of the connection barrier 24 is fixed to the inner surface of the vertical portion 231 , and the lower end is bent inward and seated on the chamfer portion 146 , so that it is connected to the secondary barrier 13 to implement sealing.

At this time, since the chamfer portion 146 of the secondary heat insulating wall 14 has a chamfer shape in which the edge is cut diagonally, the connection barrier 24 is formed between the chamfer portion 146 and the vertical portion 231 on the inside. can be bent at an acute angle toward

Of course, the chamfer 146 may be cut so that at least a part of it forms a curved line instead of an oblique line. However, in this embodiment, the sealing function can be ensured while securing the durability of the connection barrier 24 by limiting the bending of the connection barrier 24 to an acute angle.

The lower end of the vertical part 231 of the support 23 may be spaced apart upward compared to the secondary insulating wall 14, but between the vertical part 231 and the secondary insulating wall 14 is an inclined part in FIG. It may be provided as an empty space between the and the secondary insulating wall 14 . Of course, it is also possible that the outer insulation 25 is filled.

The outer insulator 25 is provided to be filled between the vertical portion 231 and the outer wall 21, and in consideration of the shape of the support 23 of this embodiment, the outer insulator 25 may be provided as a simple rectangular parallelepiped, etc. .

The inner heat insulating material 26 is provided inside the vertical portion 231 of the support 23 . The inner heat insulating material 26 may be fixed through studs 2311 having an outer surface provided on the vertical portion 231 of the support 23 , and may also be bonded to the vertical portion 231 using a mastic 261 .

The inner heat insulating material 26 may have a vertical surface corresponding to the vertical portion 231 of the support 23 . Furthermore, the inner heat insulating material 26 may be provided to have a vertical surface corresponding to the vertical portion 231 of the support 23 and an inclined surface corresponding to the chamfered portion 146 of the secondary heat insulating wall 14 .

The inner heat insulator 26 may be provided similarly to that in FIG. 2 , and a finished heat insulating wall 12a may be stacked on the inside of the inner heat insulator 26 . However, the connection barrier 24 of this embodiment is already covered by the inner heat insulating material 26 , and the finished heat insulating wall 12a may be provided to cover the inner heat insulating material 26 .

As such, in this embodiment, the chamfer portion 146 is placed on the secondary heat insulating wall 14 so that the connection barrier 24 is bent only at an acute angle to implement sealing, thereby simplifying the structure of the support 23 and improving workability. It can guarantee a high and stable sealing function. In addition, the connection barrier 24 connects the upper ends of the secondary barrier 13 and the support 23 to maintain gas tightness.

4 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.

In the dome coaming 20a of this embodiment, the support 23 has a vertical portion 231 and a bent portion 233 . The vertical portion 231 is positioned outside the secondary barrier 13 as in the previous embodiment and is provided parallel to the outer wall 21 .

However, in this embodiment, the bent portion 233 is provided instead of the inclined portion 232 of FIG. 2 , and the bent portion 233 is provided to be bent inwardly from the lower portion of the support 23 . The bent portion 233 is bent inward from the lower end of the vertical portion 231 , and the support 23 including the vertical portion 231 and the bent portion 233 may form an L-shape.

The bent portion 233 may be bent at least at a right angle to the vertical portion 231 in comparison with a case in which the vertical portion 231 is further extended. For example, the bent portion 233 is provided to be bent at 90 degrees from the vertical portion 231 and is extended in the inward direction. In this case, the length in the inner and outer directions of the bent portion 233 may be provided to such an extent that the inner end is located on the inner side of the secondary barrier 13 .

The lower end of the bent portion 233 horizontal to the upper wall 22 and the secondary heat insulating wall 14 may be spaced apart in the vertical direction, and the outer insulating material 25 may be filled in the spaced gap. In addition, at a position where the support 23 and the secondary insulating wall 14 are spaced apart, the connection barrier 24 may be bent inwardly.

Connection barrier 24, the lower end is fixed to the secondary barrier 13, the upper end is bent inward compared to the lower end is fixed to the bent portion (233). In this case, the upper end of the connection barrier 24 may be fixed to the lower surface of the bent portion 233 .

That is, the support 23 is provided in a L-shape, and the connection barrier 24 is provided in a L-shape. Therefore, after the operator bonds the lower end of the connecting barrier 24 to the secondary barrier 13 , the upper end of the connecting barrier 24 bends the connecting barrier 24 so that it overlaps with the lower surface of the bent part 233 . , it is possible to bond the upper end of the connecting barrier 24 and the lower surface of the bent portion 233 .

The lower end of the connection barrier 24 is located above the primary thermal insulation wall 12, and the connection barrier 24 can be constructed on the secondary barrier 13 that is not covered by the primary thermal insulation wall 12, A finishing heat insulating wall 12a may be provided between the secondary heat insulating wall 14 and the lower surface of the bent portion 233 to cover the connection barrier 24 .

The outer insulating material 25 is partially filled between the outer wall 21 and the support 23 , and may have a shape protruding inward between the support 23 and the secondary insulating wall 14 . As described above, since the lower end of the bent portion 233 of the support 23 is spaced apart from the upper side of the secondary insulating wall 14, there is an outer insulating material in the gap between the support 23 and the secondary insulating wall 14. (25) can be filled.

However, in the outer insulating material 25, the portion filled in the gap between the support 23 and the secondary insulating wall 14, the inner surface may be parallel to the secondary barrier 13 or the secondary insulating wall 14, 2 It may not protrude inward compared to the car barrier 13 .

Alternatively, a portion of the outer insulating material 25 filled in the gap may be provided to have a shape for guiding the curved portion of the secondary barrier 13 to protrude inward than the secondary barrier 13 .

The inner insulating material 26 may be fixed to the vertical portion 231 of the support 23 , and may be filled in a space between the vertical portion 231 and the bent portion 233 . However, in this embodiment, since the inner end of the bent portion 233 extends inward than the secondary barrier 13, the finished insulating wall 12a may be installed under the bent portion 233, and at least two The inner insulating material 26 divided as described above may be provided to fill the space between the bent portion 233 and the upper wall 22 and the space between the inner end of the bent portion 233 and the primary barrier, respectively.

As such, in this embodiment, the secondary barrier 13 and the support 23 are connected to partition the insulating space inside and outside the secondary barrier 13, but the connection barrier 24 is bent inward and attached to the lower surface of the support 23 The sealing stability (airtightness) of the connection barrier 24 can be ensured by applying a structure of the present invention.

5 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention.

Referring to FIG. 5 , in the liquefied gas storage tank 1 according to the third embodiment of the present invention, the support 23 may be provided to have a vertical portion 231 and a protrusion 234 .

The vertical portion 231 is located outside the secondary barrier 13 and is provided parallel to the outer wall 21 . The vertical portion 231 of the present embodiment is provided in the form of a protruding lower end compared to the case in which the inclined portion 232 or the bent portion 233 is provided. This is because the protrusion 234 is provided not at the lower end of the vertical portion 231 but at a point (a certain height from the lower end), and a block material 2341 on the inner side of the lower end of the vertical portion 231 and the lower side of the protrusion 234 . ) may be provided.

The protrusion 234 is provided to protrude inward from one point of the vertical part 231 . The protrusion 234 and the vertical portion 231 may have a ⅓ or T shape, but the protrusion angle of the protrusion 234 may be a right angle or an acute angle with respect to the vertical portion 231 .

The inner end of the protrusion 234 may be disposed outside the secondary barrier 13 , and the upper end of the connection barrier 24 may be fixed to the upper surface of the protrusion 234 by bonding or the like. At this time, the connection barrier 24 is provided to cover the block material 2341 between the lower end fixed to the secondary barrier 13 and the upper end fixed to the protrusion 234 .

A block material 2341 is seated in the space between the inner side of the vertical portion 231 and the lower side of the vertical portion 231 . The block material 2341 may be made of the same material as the inner insulating material 26 , and may be connected to the vertical portion 231 or the like through bonding or the like.

The block material 2341 may have a structure engaged with the secondary heat insulating wall 14 . To this end, the secondary insulating wall 14 may have a step portion 144 provided at the upper end adjacent to the support 23 , and the block material 2341 has a size extending downward of the vertical portion 231 so that the lower end is It may be seated on the step portion 144 .

In the block material 2341 , the inner surface in contact with the connection barrier 24 may be provided to be parallel to the secondary barrier 13 . Therefore, when the connection barrier 24 is in contact with the inner surface of the block material 2341 and seals between the secondary barrier 13 and the support 23, the connection barrier between the secondary barrier 13 and the block material 2341 ( 24) may not be bent or bent unnecessarily.

Connection barrier 24, the lower end is fixed to the secondary barrier 13, the central portion is in contact with the inner surface of the block material 2341, the upper end is bent outward compared to the lower end is fixed to the protrusion (234). As described above, the inner surface of the block material 2341 and the secondary barrier 13 are side by side, but since the inner end of the protrusion 234 is biased outward compared to the inner surface of the block material 2341, the connection barrier 24 is It is provided flat between the secondary barrier 13 and the block material 2341 and is bent between the block material 2341 and the protrusion 234 .

In this case, the block material 2341 may form a portion in contact with the connection barrier 24 as a curved surface or an inclined surface, etc. in order to relieve stress concentration on a bent portion of the connection barrier 24 . For example, the block material 2341 may have an inclined surface or a curved surface in the form of resolving the deviation in the inner and outer directions between the secondary barrier 13 and the inner end of the protrusion 234 .

The outside of the curved portion of the connecting barrier 24 between the block material 2341 and the protrusion 234 may be an empty space, but in order to support the connecting barrier 24, an insulating material such as glass wool or polyurethane foam It is also possible to fill

The connection barrier 24 may be bent outwardly at a right angle between the block material 2341 and the protrusion 234 , and the upper end may be fixed by bonding or welding while overlapping the upper surface of the protrusion 234 .

An inner insulation 26 of an appropriate shape/material may be installed between the upper end of the connection barrier 24 and the upper wall 22, and the inner surface of the connection barrier 24 is covered with a finished insulation wall 12a, A primary barrier 11 may be installed on the inner surface of the finished insulating wall 12a.

As such, this embodiment has a horizontal protrusion 234 on the support 23 and seals between the protrusion 234 and the secondary barrier 13 with a connecting barrier 24, but by placing a block material 2341 2 It is possible to support the car barrier 13 . In addition, since the connection barrier 24 overlaps the upper surface of the support 23 , the block material 2341 and the secondary barrier 13 , it is possible to maintain gas tightness.

Additionally, in this embodiment, a block material 2341 having a lower coefficient of thermal expansion than the secondary insulating wall 14 is added instead of the connection barrier 24 directly sealing between the secondary insulating wall 14 and the support 23 . By doing so, it is possible to effectively prevent damage due to thermal stress by reducing the thermal stress applied to the connection barrier 24 .

6 is a partial cross-sectional view of a liquefied gas storage tank according to a fourth embodiment of the present invention.

6, in the liquefied gas storage tank 1 according to the fourth embodiment of the present invention, the upper end of the connection barrier 24 is fixed to the upper wall 22 instead of the support 23, and the secondary barrier ( 13) and the dome 20 may be sealed.

Specifically, in the present embodiment, the connection barrier 24 may have a lower end fixed to the secondary barrier 13 and an upper end bent inward relative to the lower end to be fixed to the inner end of the upper wall 22 .

A first step removing means 221 may be provided at the inner end of the upper wall 22 , and the first barrier 11 may be fixed to the inner surface of the first step removing means 221 . The upper end may be fixed to the lower surface of the first step removing means 221 provided on the upper wall 22 .

In this embodiment, the support 23 may have a L-shape by having a vertical portion 231 and a bent portion 233 , and the inner end of the bent portion 233 has a secondary barrier 13 unlike in FIG. 4 . It may be disposed more outside. In this case, the insulating space inside and outside the secondary barrier 13 is not partitioned by the support 23 , and the support 23 may be disposed in the insulating space outside the secondary barrier 13 .

At this time, in this embodiment, the bent portion 233 and the secondary insulating wall 14 are vertically spaced apart, and at least a portion of the outer insulating material 25 fixed between the support 23 and the outer wall 21 is the support ( 23) and the secondary insulating wall 14 may have a shape protruding inwardly. However, the inner surface of the portion of the outer insulating material 25 filled between the support 23 and the secondary insulating wall 14 may be parallel to the secondary barrier 13 .

In this embodiment, in order to support the connection barrier 24 between the secondary barrier 13 and the primary step removing means 221, the inner insulation 26 may be used. The inner heat insulating material 26 is disposed inside the vertical portion 231 and is fixed through the vertical portion 231/bent portion 233 , and the inner surface may be located inside the bent portion 233 .

The inner heat insulating material 26 may be formed in a L-shape having an inner surface parallel to the secondary barrier 13 and a lower surface parallel to the lower surface of the primary step removing means 221 . Of course, the part having the inner surface parallel to the secondary barrier 13 and the part having the lower surface parallel to the lower surface of the first step removing means 221 are made of the same / different material and separately provided, and then the upper wall of the dome coaming 20a It can be installed in (22) to form one body.

The L-shaped inner insulation 26 is, while supporting the vertical portion of the connecting barrier 24 extending upward from the secondary barrier 13, the connecting barrier 24 fixed to the primary step removing means 221 ) can be in contact with the horizontal part of At this time, the connection barrier 24 is provided to be bent at the step portion of the inner heat insulator 26 , and the step portion of the inner heat insulator 26 has a shape such as a right angle or a curved surface.

A finishing insulating wall 12a may be provided on the inner surface of the connection barrier 24 for the construction of the primary barrier 11 . It may be processed in the form of a curved surface or an inclined surface to correspond to the shape of the barrier 24 .

As such, in this embodiment, by utilizing the inner end structure of the upper wall 22, not the support 23, to close the inner and outer insulation space of the secondary barrier 13, the shape of the support 23 in terms of structural strength is reduced. You can design more freely. In addition, in this embodiment, the connection barrier 24 is connected from one side of the first step difference canceling means 221 , the inner heat insulating material 26 , the outer heat insulating material 25 , and the second barrier 13 , so that the gas tightness can be maintained. .

7 is a partial cross-sectional view of a liquefied gas storage tank according to a sixth embodiment of the present invention.

Referring to FIG. 7 , in the liquefied gas storage tank 1 according to the sixth embodiment of the present invention, the support 23 may extend horizontally inward from the outer wall 21 .

However, the support 23 of this embodiment may not provide the vertical portion 231, and the upper end of the connection barrier 24 may be fixed to the upper surface of the horizontal portion 235 of the support 23 while being bent outward compared to the lower end. have.

Specifically, the support 23 may have a horizontal portion 235 extending inwardly from the outer wall 21 , and the horizontal portion 235 may be spaced apart from the secondary insulating wall 14 upwardly. At this time, a block material 2341 is provided between the horizontal portion 235 and the secondary heat insulating wall 14 .

At least a portion of the block material 2341 is provided between the horizontal portion 235 and the secondary heat insulating wall 14 , and may be provided to surround the inner end of the horizontal portion 235 . In particular, the inner surface of the portion surrounding the inner end of the horizontal portion 235 in the block material 2341 may be provided in a curved shape to guide the bending of the connection barrier 24 .

That is, in this embodiment, when the connecting barrier 24 is deformed to be bent between the secondary barrier 13 and the support 23, the block material 2341 guides the deformed portion of the connecting barrier 24 to connect it. The structural strength of the barrier 24 may be supplemented.

In addition, the block material 2341 may finish the inner end of the horizontal portion 235 with a curved surface or an inclined surface to prevent the connection barrier 24 from being damaged by the inner end of the horizontal portion 235 . At least a portion of the block material 2341 is disposed between the horizontal portion 235 and the secondary heat insulating wall 14 and may have an L-shape having a step portion corresponding to the thickness of the horizontal portion 235 . In addition, the upper end of the block material 2341 is provided at a height below the upper surface of the horizontal portion 235 , so that the connection barrier 24 bent by the curved surface of the block material 2341 is smoothly fixed to the horizontal portion 235 . Meanwhile, although the block material 2341 is shown as a curved surface in FIG. 7 , the inner end of the horizontal portion 235 is not formed of the block material 2341 but may be formed of an empty space.

Between the horizontal portion 235 and the upper wall 22 of the support 23, the outer insulation 25 may be installed. In addition, an inner heat insulating material 26 is installed between the outer heat insulating material 25 and the first step removing means 221 . Thereafter, the finished insulating wall 12a is laminated to cover the outer insulating material 25, the connection barrier 24, etc., and the primary barrier 11 is formed on the inner surface of the finished insulating wall 12a and the primary insulating wall 12. can be installed.

As such, in this embodiment, the support 23 is provided as a horizontal portion 235 , and the inner end of the horizontal portion 235 is wrapped with a curved surface using a block material 2341 , and the support 23 and the secondary Between the barriers 13, it is possible to support the bent portion with respect to the connecting barrier 24 bent in the L-shape.

In addition, in this embodiment, the connection barrier 24 is connected in a way that surrounds the support 23 , the block material 2341 and the upper end of the secondary barrier 13 , it is possible to maintain gas tightness. In addition, the present embodiment can not only shorten the working period by simply improving the complex barrier finishing structure, but also maximize the sealing effect by sufficiently securing the bonding site of the connection barrier 24 .

8 is a partial cross-sectional view of a liquefied gas storage tank according to a seventh embodiment of the present invention.

Referring to FIG. 8 , in the liquefied gas storage tank 1 according to the seventh embodiment of the present invention, a connection barrier 24 may be fixed to the upper wall 22 . In particular, in this embodiment, the support 23 described in the other embodiments above can be omitted.

Specifically, in the connection barrier 24 of this embodiment, in order to seal between the secondary barrier 13 and the dome 20, the lower end is fixed to the secondary barrier 13 and the upper end is bent inward compared to the lower end to the upper wall 22 ) can be fixed to the lower surface of the

The upper wall 22 may be provided with a first step removing means 221 at the inner end, and the connection barrier 24 has an upper end fixed to the lower surface of the upper wall 22 from the outside of the first step removing means 221 . . That is, in contrast to FIG. 6 in which the upper end of the connecting barrier 24 is fixed to the lower surface of the first step removing means 221 , in this embodiment, the connecting barrier 24 is the upper wall 22 regardless of the first step removing means 221 . ) can be fixed.

At this time, an outer heat insulating material 25 may be provided between the upper wall 22 and the secondary heat insulating wall 14 , and the outer heat insulating material 25 has an inner surface parallel to the secondary barrier 13 to form a connection barrier 24 . can support The connection barrier 24 is supported by the inner surface of the outer heat insulator 25 , and is bent inward at a position above the outer heat insulator 25 to be fixed to the lower surface of the upper wall 22 .

In this embodiment, as the connecting barrier 24 is directly connected to the lower surface of the upper wall 22 , the connecting barrier 24 may be provided so that the upper end thereof is placed above the lower surface of the first step removing means 221 .

At this time, an inner heat insulating material 26 having an appropriate shape and material may be installed between the connecting barrier 24 and the first step removing means 221 in the inner and outer directions, and the lower side of the inner heat insulating material 26 and the connecting barrier 24 On the inner surface of the end insulation wall (12a) is constructed, the connection barrier (24) can be covered.

As such, in this embodiment, the upper end of the connection barrier 24 fixed to the secondary barrier 13 is directly fixed to the lower surface of the upper wall 22, and between the connecting barrier 24 and the outer wall 21 in the inner and outer directions. By omitting the separate support 23 on the lower surface of the upper wall 22 in the structure can be greatly simplified.

In addition, in this embodiment, the connection barrier 24 is installed by connecting the upper wall 22, the outer insulating material 25, and the secondary barrier 13, so it is easy to maintain gas tightness, and the working period is shortened through structural simplification, It is possible to obtain effects such as an increase in thermal insulation efficiency through sufficient installation of thermal insulation materials.

Of course, the present invention may include a combination of at least any one or more embodiments and known techniques known to those skilled in the art, or a combination of at least two or more embodiments, as additional embodiments, in addition to the embodiments described above.

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

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

1: liquefied gas storage tank 10: wall
11: primary barrier 12: primary insulation wall
121: plywood 122: insulation block
12a: finishing insulation wall 13: secondary barrier
14: secondary insulation wall 141: plywood
142: insulation block 143: mastic
144: step portion 146: chamfer portion
20: dome 20a: dome coaming
21: exterior wall 211: stiffener
22: upper wall 221: 1st step gap resolution means
222: fixed end 23: support
231: vertical part 2311: stud
232: inclined portion 233: bent portion
234: protrusion 2341: block material
235: horizontal part 236: second step resolution means
237: fixed end 24: connection barrier
25: outer insulation material 26: inner insulation material
261: mastic 262: fixture

Claims (5)

A metal primary barrier forming a storage space for accommodating liquefied gas, a primary insulating wall disposed outside the primary barrier, a secondary barrier provided outside the primary insulating wall; a wall including a secondary heat insulating wall disposed outside the primary barrier, the wall forming an insulating space between the primary barrier and the secondary barrier and outside the secondary barrier; and
and a dome provided on the wall forming the upper surface of the storage space to close the insulating space,
The dome is
an outer wall having a predetermined height above the storage space;
an upper wall supported by the outer wall and connected to an inner end of the primary barrier;
a support extending downwardly from the upper wall on the inner side of the outer wall; and
a connection barrier sealing between the secondary barrier and the support;
The support is located outside the secondary barrier and has a vertical portion parallel to the outer wall,
The secondary heat insulation wall is provided with a chamfer inclined toward the vertical portion at an upper end,
The connection barrier has a lower end fixed to the secondary barrier located in the chamfer portion, and an upper end is bent inwardly relative to the lower end to be fixed to the vertical portion, and is bent at an acute angle inward between the chamfer portion and the vertical portion. A liquefied gas storage tank. delete According to claim 1, wherein the support,
A liquefied gas storage tank, characterized in that the lower end of the vertical portion is spaced apart upward compared to the secondary insulating wall. The method of claim 1,
The dome is fixed to the inside of the vertical part and has an inner insulation material having an inner surface parallel to the inner surface of the secondary barrier,
The inner insulating material, the liquefied gas storage tank, characterized in that the outer surface has a vertical surface and an inclined surface corresponding to the vertical portion of the support and the chamfered portion of the secondary insulating wall. A ship comprising the liquefied gas storage tank of any one of claims 1, 3 to 4.

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