KR102498659B1 - 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, a primary barrier made of a metal material forming a storage space for accommodating liquefied gas, a primary insulation wall disposed outside the primary barrier, and the above It includes a secondary barrier provided outside the primary thermal insulation wall and a secondary thermal insulation wall disposed outside the secondary barrier, and thermal insulation between the primary barrier and the secondary barrier and on the outside of the secondary barrier. walls forming spaces; and a dome provided on the wall constituting an upper surface of the storage space to close the heat insulation space, wherein the dome includes: an outer wall having a predetermined height upward of the storage space; an upper wall supported by the outer wall and to which the primary barrier is connected to an inner end; a support extending downward from the upper wall inside the outer wall; and a connection barrier that seals between the secondary barrier and the support, wherein the connection barrier has wrinkles protruding or sinking in an inward and outward direction between the secondary barrier and the support.

Description

Liquefied gas storage tank and ship containing 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 natural gas (LNG) and liquefied petroleum gas (LPG) have been widely used to replace gasoline or diesel.

LNG carriers that transport or store liquefied gas such as LNG at sea, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit), etc. A liquefied gas storage tank (so-called "cargo hold") is installed to store 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 through an adiabatic design, the Boil Off Rate (BOR), which is the vaporization rate of the boil-off gas, can be lowered. This is the core technology of liquefied gas storage tank design.

Therefore, 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 an outward direction based on the space in which LNG is stored.

In addition, a dome is formed on the upper surface of the liquefied gas storage tank 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 have been made are losing

The present invention has been 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 implementing sealing of barriers 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 insulation wall disposed outside the primary barrier, and the primary insulation. It includes a secondary barrier provided outside the wall and a secondary insulation wall disposed outside the secondary barrier, and a thermal insulation space is formed between the primary barrier and the secondary barrier and outside the secondary barrier. wall to do; and a dome provided on the wall constituting an upper surface of the storage space to close the heat insulation space, wherein the dome includes: an outer wall having a predetermined height upward of the storage space; an upper wall supported by the outer wall and to which the primary barrier is connected to an inner end; a support extending downward from the upper wall inside the outer wall; and a connection barrier that seals between the secondary barrier and the support, wherein the connection barrier has wrinkles protruding or sinking in an inward and outward direction between the secondary barrier and the support.

Specifically, the support has a vertical portion located outside the secondary barrier and parallel to the outer wall, and a bent portion bent inward from the bottom of the vertical portion, and a secondary step to which the connection barrier is fixed to the inner surface. A releasing means may be provided at an inner end of the bent portion.

Specifically, the connection barrier may have a flat portion provided at a lower end connected to the second barrier and an upper end connected to the second step difference eliminator, and the wrinkled portion may be provided at a portion between the flat portions.

Specifically, the dome may include an inner heat insulating material fixed to the inside of the vertical portion; and an outer insulator at least partially filled between the outer wall and the support, wherein the outer insulator may protrude inward between the support and the secondary insulation wall.

Specifically, the inner surface closest to the storage space in the outer insulator is disposed outwardly than the inner surface of the secondary step eliminator, so that the wrinkle portion is accommodated between the secondary step eliminator and the secondary insulation wall. A depression may be formed.

A ship according to one aspect of the present invention has the liquefied gas storage tank.

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

In addition, the liquefied gas storage tank and the ship including the same according to the present invention can maintain the confidentiality of the liquefied gas because the connection barrier is connected to and fixed to one side of the secondary barrier, the insulation material, and the support.

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.

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 adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description 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 described below. At this time, the ship can be a ship that uses at least liquefied gas as a propulsion fuel/power generation fuel, and is a concept that includes all gas carriers, merchant ships that carry non-gas cargo or people, FSRU, FPSO, Bunkering vessel, and offshore plants. .

Hereinafter, each embodiment will be described with reference to each drawing, but with reference to FIG. 1 first, items commonly included in the embodiments will be described first.

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). At this time, the liquefied gas storage tank 1 may be 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 drawn in and installed in the inner space of the hull.

The type of the liquefied gas storage tank 1 is not particularly limited, and the location where the liquefied gas storage tank 1 is mounted on the hull (inside a ship or outboard such as an 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 inward direction.

For reference, in this specification, the liquefied gas storage tank 1 will be described assuming that it is a membrane type in which an insulation layer is directly installed on the hull bulkhead. However, since the liquefied gas storage tank 1 may be provided as an independent type, it is noted that the expression hull below can be interpreted as replacing the external 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 will be assumed that the liquefied gas is LNG, but in the present invention, the liquefied gas is forced to be liquefied for storage because its boiling point is lower than room temperature, in addition to LNG, and covers all substances (LPG, ethane, hydrogen, ammonia, etc.) with calorific value. 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 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 liquefied gas and also forms an adiabatic space. Specifically, the wall 10 has a primary barrier 11, a primary insulation wall 12, a secondary barrier 13, and a secondary insulation wall 14 from the inside to the outside. For reference, in this specification, the inside means a direction toward the inside of the space where the liquefied gas is stored, and the outside means the opposite direction.

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

In addition, a wrinkled or concave-convex structure may be formed on the primary barrier 11 to prepare for sloshing. As these primary barriers 11 are overlapped with each other and sealed by welding, the entire storage space (except for the dome 20) 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 to prevent leakage of liquefied gas, the liquefied gas storage tank 1 of the present invention has a structure that implements leakage prevention in at least two layers.

The primary insulation wall 12 is disposed outside the primary barrier 11 and implements a primary insulation function. The primary insulating wall 12 may have a laminated form of plywood 121 and insulating block 122 . The plywood 121 is provided on the inside of the primary 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 outer side of the primary insulating wall 12 and has insulating properties. The insulating block 122 may be made of a polyurethane foam block or a box block containing an insulating material. The insulation block 122 may be bonded and fixed to the secondary barrier 13 to be described later through bonding or the like, or may be fixed to the hull or the like by bolting.

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

The primary heat 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 of the dome coaming 20a and the secondary barrier 13.

That is, according to the construction sequence, the secondary barrier 13 is provided on the secondary insulation wall 14 and the primary insulation wall 12 is provided on the secondary barrier 13, the uppermost primary insulation wall ( 12) is located below the upper wall 22 and exposes a part of the secondary barrier 13. At this time, as the connection 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 sealed and connected to each other.

Thereafter, the gap between the uppermost primary insulating wall 12 and the upper wall 22 of the dome coaming 20a may be filled with the finished insulating wall 12a to cover the connection barrier 24 . The finish insulating wall 12a may have a structure including a plywood (not shown) and a heat insulating block (not shown) identically / similarly to the primary insulating wall 12 .

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

The secondary barrier 13 is provided outside the primary thermal insulation 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 glass fiber sheets are laminated on both sides of a metal sheet, or a composite sheet in which metal sheets are laminated on both sides of a 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 insulation wall 14 . However, in order to seal the gap between the secondary insulation walls 14, a separate secondary barrier 13 is laminated. The secondary barrier 13 on the secondary insulation wall 14 is made of a relatively rigid material, , The secondary barrier 13 between the secondary insulation walls 14 may be provided with a relatively flexible material in preparation for contraction and expansion.

The secondary insulation wall 14 is disposed outside the secondary barrier 13 . The secondary insulation wall 14 has a thermal insulation function similar to the primary insulation wall 12, and has a structure in which plywood 141 and insulation block 142 are laminated in the same / similar to the primary insulation wall 12. It 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 insulation wall 12 is provided with a plywood 121 provided with an anchoring unit for welding fixation of the primary barrier 11, while the secondary insulation wall 14 is fixed to the hull side. A plywood 141 may be provided on the outer surface.

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

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

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

In this way, the storage space of the liquefied gas storage tank 1 may be formed by the wall 10 having the double barrier and the double insulation wall (insulation space). The wall 10 includes a flat or curved surface or an inclined surface 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 top surface for the inflow and outflow of liquefied gas or boil-off gas, and the dome 20 is installed and finished at the open portion.

At this time, the wall 10 constituting the upper surface of the storage space may be provided to protrude upward at a certain height from the open portion to form a protrusion (not shown), and a dome 20 may be installed on the upper end of the protrusion.

The dome 20 closes the insulation space formed in the wall 10. As described above, the insulation space is provided on the inside and outside of the secondary barrier 13 in the wall 10, and the dome 20 may close each insulation space to be separated from each other.

The dome 20 includes a dome coaming 20a fixed to 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 make the IBS and IS separate from each other and form a closed space through a specific structure to be described later, and a nitrogen line (not shown) is provided to pass through the dome coaming 20a so as to penetrate the nitrogen in the insulation space. The inflow and outflow of can be implemented.

A dome cover (not shown) may be provided on the upper side of the dome coaming 20a. A line through which liquefied gas or boil-off gas can flow in and out may be disposed in the dome cover, and an upper end of a pump tower (not shown) is fixedly installed in 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 description of the second embodiment below, the explanation will be focused on the differences of the corresponding embodiment compared to the previous contents, and the omitted description will be replaced with the previous contents.

2 to 7 are partial cross-sectional views of a liquefied gas storage tank according to the present invention, and FIGS. 2 to 7 show first to sixth embodiments, respectively.

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

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

The outer wall 21 has a certain height upward of the storage space. The outer wall 21 may be provided parallel to the outer surface of the protrusion and may be integrally fixed with the hull. It is also possible that a part of the hull is provided to replace the outer wall 21.

The outer wall 21 may be provided in a polygonal column shape, and lines may be provided to pass through each side. However, lines for supplying nitrogen to the insulation space/discharging nitrogen from the insulation space may be provided on opposite sides of the dome coaming 20a.

A horizontal reinforcing member 211 may be provided on the outside of the outer wall 21 . Depending on 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 to the outer circumference of the outer wall 21 .

At this time, the reinforcing material 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 member 211 can be omitted, and the trunk deck can serve as the reinforcing member 211 .

The upper wall 22 is supported by the outer wall 21 and a dome cover is seated on at least a portion thereof. The upper wall 22 may be configured to be vertically fixed to the top of the outer wall 21, and may be provided horizontally and provided in parallel with the wall 10 forming the upper surface of the storage space.

The upper wall 22 may be provided in a form protruding outward from the outer wall 21, and a dome cover may be inserted into the inside. In addition, since the upper wall 22 has a width equal to or greater than the thickness of the wall 10, it is possible to cover 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) is provided between the upper wall 22 and the reinforcing member 211 to increase structural strength. .

A primary barrier 11 may be connected to the inside of the upper wall 22 . To this end, a first step difference eliminating means 221 is provided at the inner end of the upper wall 22 . The first level difference eliminating means 221 may be a structure having a U-shape consisting of upper and lower surfaces and a vertical surface therebetween, and the upper surface may overlap and be fixed to the inner end of the upper wall 22 .

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

The support 23 extends downward from the upper wall 22 outside and inside the outer wall 21 . When the support 23 covers the insulation spaces through the upper wall 22, it will be used to separate the inner insulation space IBS of the secondary barrier 13 and the outer insulation space IS of the secondary barrier 13. can

The support 23 is connected to the secondary barrier 13 through a connection barrier 24 to be described later, so that the outer insulation space of the secondary barrier 13 communicates with the outside of the support 23 and the secondary barrier 13 The inner heat insulation space of the is in communication with the inside 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 insulation space in the inner and outer directions.

The support 23 may be provided to have a vertical portion 231 and a protruding portion 234 . 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 on the outside compared to the secondary barrier 13 and is provided parallel to the outer wall 21 on 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 insulation space outside the secondary barrier 13 by interconnecting the support 23 and the secondary barrier 13, in this embodiment, the support 23 may be provided with a protrusion 234, etc. A block material 2341 may be provided between the vertical portion 231 and the protruding portion 234 . According to the drawing, the block material 2341 may have a height between the protrusion 234 and the secondary insulation wall 14.

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

An inner end of the protrusion 234 may be disposed outside the secondary barrier 13, and a block material 2341 may be fixed to a lower surface of the protrusion 234 by bonding or the like. At this time, the lower end of the connection barrier 24 is fixed to the secondary barrier 13 and the upper end is fixed to the inner surface of the block material 2341 to cover between the support 23 and the secondary barrier 13.

In this embodiment, the support 23 and the secondary barrier 13 may be finished using the block material 2341. At this time, the block material 2341 may be provided in a form in which the sealing layer 2342 is surrounded on the inner surface and upper and lower surfaces.

That is, in the block material 2341 provided in the space between the inner side of the vertical portion 231 and the lower side of the protruding portion 234 in the support 23, the sealing layer 2342 on the upper surface abuts with the lower surface of the protruding portion 234 to provide sealing. It is connected and the sealing layer 2342 of the lower surface is connected to the upper surface of the secondary insulation wall 14. In addition, the upper end of the connection barrier 24 is fixed to the sealing layer 2342 provided on the inner surface of the block material 2341 .

The sealing layer 2342 may use the same material as the connection barrier 24 , and maintain airtightness similarly to the connection barrier 24 .

The connection barrier 24 seals between the secondary barrier 13 and the support 23 to divide the insulation space inside and outside the secondary barrier 13 . The connection barrier 24 may be made of the same/similar material as the secondary barrier 13, but may be made of a material that is flexible compared to the secondary barrier 13 provided on the secondary insulation wall 14.

The connection barrier 24 may be made of a material capable of bending during installation. For example, the connection barrier 24 may be formed of a composite sheet in which glass fiber sheets are laminated on both sides of a metal sheet.

The connection barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end fixed to the inner sealing layer 2342 of the block material 2341, and the connection barrier 24 is not fixed to the protrusion 234 and is flat. can be provided in the form For example, the operator may fix the lower end of the connection barrier 24 to the secondary barrier 13 first, and then attach and fix the upper end to the inner sealing layer 2342 of the block material 2341 by bonding or the like.

At this time, the protrusion 234 of the support 23 has an inner end located outside the secondary barrier 13, but the block material 2341 has an inner sealing layer 2342 to which the connection barrier 24 is fixed is the secondary barrier. (13) and can be arranged in parallel. Therefore, since the connection barrier 24 is provided to flatly connect between the secondary barrier 13 and the inner sealing layer 2342 of the block material 2341, it may be made of a rigid material in addition to a flexible material.

In this embodiment, the sealing from the support 23 to the secondary barrier 13 is the vertical portion 231 of the support 23, the protrusion 234 of the support 23, and the upper surface sealing layer of the block material 2341. 2342, the inner sealing layer 2342 of the block material 2341, the connection barrier 24, and the secondary barrier 13 may be followed in this order.

For sealing, the sealing layer 2342 covering the upper and lower surfaces and the inner surface of the block material 2341 may be integrally formed to prevent leakage of gas, and the lower surface of the block material 2341 is the inner surface of the block material 2341. Since it is a portion covered by the connection barrier 24 between the sealing layer 2342 and the secondary barrier 13, the sealing layer 2342 provided on the lower surface of the block material 2341 and in contact with the secondary insulation wall 14 is may be omitted.

In addition, the sealing layer 2342 may be omitted from the outer surface of the block material 2341 in contact with the vertical portion 231 . Accordingly, the sealing layer 2342 covered by the block material 2341 may form a U-shape.

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

Between the support 23 and the outer wall 21, an outer heat insulating material 25 may be provided. The outer heat insulating material 25 is filled between the outer wall 21 and the support 23, and can implement a secondary heat insulating function together with the secondary heat insulating wall 14. However, the outer heat insulating material 25 may be made of the same/similar material or a different material from the secondary heat insulating wall 14, and for example, the outer heat insulating material 25 may be made of glass wool, reinforced polyurethane foam, or the like.

The space where the outer heat insulating material 25 is provided is an outer heat 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 space > IBS, but is not limited thereto.

The outer heat 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 located below the vertical portion 231 and come into contact with the secondary heat insulating wall 14 .

The outer heat insulator 25 may be divided into at least two parts in consideration of construction efficiency and the like, may be integrated after construction, and may be partially made of different materials.

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 connection barrier 24 . The inner insulator 26 compensates for the fact that the vertical portion 231 of the support 23 is biased outward compared to the secondary barrier 13, and can be provided to secure a flat surface for installation of the finished insulation wall 12a, , It can be filled between the protrusion 234 and the upper wall 22.

The inner insulator 26 may be made of the same or similar material as the outer insulator 25, or may be made of a material in which wood is overlapped in multiple layers to secure a fixing force. In the latter case, the inner insulator 26 may be fixed using a stud 2311 provided in an inward direction on the vertical portion 231 and a fixture 262 (nut, etc.) fixed to the stud 2311, as shown in FIG. there is.

The inner insulator 26 has a shape corresponding to the outer surface of the support 23, and when the outer surface of the primary insulating wall 12 is laminated on the inner surface of the secondary barrier 13 is extended upward, the outer surface and It may have a shape filling the space provided between the supports 23 .

In addition, the inner heat insulator 26 may also be applied between the primary level gap eliminator 221 and the vertical portion 231 of the support 23 . The inner heat insulating material 26 may be provided in various ways to make the lower part of the upper wall 22 and the inner part of the support 23 into a square shape in order to install the finished insulating wall 12a, and may be partially made of different materials. can For example, the inner insulator 26 located between the vertical portion 231 and the protrusion 234 of the support 23 is made of a wood material to secure a fixing force, and the first step relieving means on the lower surface of the upper wall 22 ( The inner heat insulating material 26 provided on the outer side of 221) may be made of polyurethane material for a heat insulating effect.

In the state in which the inner heat insulating material 26 is provided, the finishing insulating wall 12a is provided inside the connection barrier 22 and the block material 2341, so that the inner surface of the finishing insulating wall 12a and the primary insulating wall 12 A primary barrier 11 may be installed.

In this way, in this embodiment, the support 23 is placed at the lower end of the upper wall 22 in the dome coaming 20a, and the secondary barrier 24 is used as the connection barrier 24 to separate the insulation space inside and outside the secondary barrier 13 ( 13) and the support 23, but after constructing the block material 2341 covered with the sealing layer 2342 on the support 23, the top of the connection barrier 24 is not the support 23, but the block material Since the connection barrier 24 can be installed flat by being fixed to the sealing layer 2342 of the 2341, workability can be improved.

In addition, the present embodiment can cover the gap between the secondary insulation wall 14, the block material 2341, and the secondary barrier 13 through the connection barrier 24, so that gas tightness can be maintained. In addition, the present embodiment is effective in maintaining confidentiality by using the block material 2341, which is structurally robust and has a low risk of damage.

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 , in the liquefied gas storage tank 1 according to the second embodiment of the present invention, the support 23 extends inward from the outer wall 21 instead of the upper wall 22 .

The support 23 may extend inwardly from the outer wall 21 at the lower side of the upper wall 22, and specifically, the support 23 includes a horizontal portion 235 extending inwardly from the outer wall 21, and a horizontal portion ( 235 may have a vertical portion 231 extending downward from the inner end and parallel to the outer wall 21 .

In addition, the support 23 including the horizontal portion 235 and the vertical portion 231 includes an L-shaped outer portion 2351 extending inwardly from the outer wall 21 and an inner end of the outer portion 2351 extending inwardly, It may be interpreted as including an L-shaped inner portion 2352 that is vertically bent.

In this support 23, a block material 2341 is provided below the horizontal portion 235 and outside the vertical portion 231. An inner metal strip 2343 may be provided on the inner surface of the block material 2341, and plywood (not shown) may be laminated on the inner surface for installation of the inner metal strip 2343.

The block material 2341 may be disposed between the support 23 and the secondary insulation wall 14, and is fixed to the inner surface of the outer wall 21. In addition, the inner metal strip 2343 provided on the inner surface of the block material 2341 is provided in parallel with the secondary barrier 13.

The connection barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end fixed to the inner metal strip 2343 of the block material 2341, and the support 23 has a vertical portion 231 attached to the inner metal strip ( 2343) can be fixed. In this case, the vertical portion 231 and the connection barrier 24 may be respectively fixed to the inner metal strip 2343 with a gap in the upper and lower portions.

However, since the inner metal strip 2343 is also made of a metal material and can implement a barrier function, there is no concern about leakage between the support 23 - the inner metal strip 2343 - the connection barrier 24 . Of course, it is also possible that the support 23 and the connection barrier 24 are overlapped and fixed on the inner metal strip 2343. The inner metal strip 2343 may serve to connect between the connection barrier 24 and the vertical portion 231 and at the same time perform a sealing role.

In addition, an upper metal strip 2344 to which the horizontal portion 235 of the support 23 is fixed may be provided on the upper surface of the block material 2341 . As described above, the support 23 may be provided in a structure in which a separately provided outer portion 2351 and an inner portion 2352 are connected. ) may allow the inner metal strip 2343 to be seated.

At this time, the overlapped portion between the inner portion 2352 and the outer portion 2351 may be a position on the upper metal strip 2344, and the inner portion 2352 and the outer portion 2351 may be connected to each other by sealing through the upper metal strip 2344. .

Of course, as mentioned earlier with the inner metal strip 2343, the inner part 2352 and the outer part 2351 are connected to the upper metal strip 2344 with a gap in the inward and outward direction, so that the outer part 2351 - the upper metal strip 2344 ) - It is also possible to have a structure in which there is no risk of leakage between the inner part 2352.

In the case of the upper metal strip 2344, it can play a role of fixing the inner part 2352 and at the same time prevent burn damage to the back surface when the outer part 2351 is installed.

In this embodiment, the support 23 is provided so as to extend inwardly from the outer wall 21 instead of the upper wall 22, and the inner insulating material 26 may be filled between the support 23 and the upper wall 22.

The connection barrier 24, the inner portion 2352 and the inner insulation 26 may be covered by the finish insulation wall 12a, which is the primary barrier together with the primary insulation wall 12. (11) can form the inner surface on which it is installed.

In addition, when the outer portion 2351 is vertically overlapped with the inner portion 2352 in the support 23, a gap may be formed between the outer portion 2351 and the block material 2341 by the thickness of the inner portion 2352. The outer heat insulating material 25 may be filled in. Alternatively, the outer heat insulating material 25 may be omitted in this embodiment.

As described above, in this embodiment, the lower end of the support 23 extending inwardly from the outer wall 21 and the upper end of the connection barrier 24 form a gap by using the block material 2341 having the inner metal strip 2343. Sufficient sealing can be achieved while allowing indirect connection. In addition, gas tightness can be efficiently maintained due to the overlapping structure of the connection barrier 14 and the upper metal strip 2344 and the support 23 .

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

Referring to FIG. 4, in the liquefied gas storage tank 1 according to the third embodiment of the present invention, the support 23 and the connection barrier 24 are formed by using a block material 2341 having an inner metal strip 2343. make it connect

However, in this embodiment, the support 23 may extend downward from the upper wall 22 inside the outer wall 21 . In addition, the support 23 may include a vertical portion 231 and a bent portion 233, and a secondary step difference eliminator 236 may be provided in the bent portion 233.

The lower end of the support 23 is spaced upward from the secondary insulation wall 14, and a gap may be formed between the bent portion 233 and the secondary insulation wall 14. At this time, at least a part of the secondary step difference eliminating means 236 may be positioned in the gap, and the block material 2341 may be seated.

The second step solving means 236 may have a U-shape similar to the first step solving means 221, and a fixed end 237 is provided on the bent part 233 to fix the second step solving means 236. This may be provided and the lower surface of the secondary step difference eliminating means 236 may be fixed to the bent part 233 by the fixing end 237 .

In addition, the upper surface of the second step eliminating means 236 may be fixed by overlapping with the upper surface of the bent portion 233, and the inner surface of the second step eliminating means 236 is formed of the second barrier 13/block material 2341. It may be provided parallel to the inner metal strip 2343.

The block material 2341 is disposed between the bent portion 233 of the support 23 and the secondary insulation wall 14, and an inner metal strip 2343 is provided on the inner surface. The block material 2341 may be fixed to the inner surface of the outer wall 21, and the inner metal strip 2343 on the inner surface may be provided in parallel with the inner surface of the secondary barrier 13/second step eliminator 236. can

The connection barrier 24 may have a lower end fixed to the secondary barrier 13 and an upper end fixed to the support 23 via the inner metal strip 2343 of the block material 2341 . Specifically, the connection barrier 24 may be fixed to the inner surface of the secondary step difference eliminating means 236 provided on the support 23 at the upper end.

Also, the connection barrier 24 may include a lower connection barrier 241 and an upper connection barrier 242 . The lower connection barrier 241 may have a lower end fixed to the secondary barrier 13 and an upper end connected to the inner metal strip 2343 of the block material 2341 . In addition, the lower end of the upper metal barrier is connected to the inner metal strip 2343 of the block material 2341 and the upper end is connected to the inner surface of the secondary step eliminator 236 of the support 23.

In this case, the lower connection barrier 241 may be made of a material that is softer than the upper connection barrier 242. For example, the lower connection barrier 241 may be made of a composite sheet, and the upper connection barrier 242 may be made of a metal sheet such as SUS. there is. At this time, the upper connection barrier 242 may be referred to as a finishing member that seals between the secondary step difference eliminating means 236 and the inner metal strip 2343 of the block material 2341, and only the lower connection barrier 241 is a connection barrier. (24) may also be referred to as Meanwhile, although not shown in FIG. 4 , the connection barrier 24 may be formed integrally with one body.

Here, the upper end of the lower connection barrier 241 and the lower end of the upper connection barrier 242 may be fixed to the inner metal strip 2343 of the block material 2341 with an upper and lower gap therebetween. That is, between the support 23 and the secondary barrier 13 is the bent portion 233 - the secondary step difference eliminator 236 - the upper connection barrier 242 - the inner metal strip 2343 - the lower connection barrier 241 - The secondary barrier 13 is sealed in order.

Therefore, in this embodiment, the secondary barrier 13, the inner metal strip 2343, and the inner surface of the secondary step eliminator 236 are all disposed on one plane without a step, and the second barrier 13 and the inner metal A rigid connection barrier 24 ) can be used.

Of course, in this embodiment, it is also possible to overlap and fix the lower connection barrier 241 and the upper connection barrier 242 on the inner metal strip 2343 . However, in this case, since a step is formed at a portion where the lower connection barrier 241 and the upper connection barrier 242 overlap each other, the connection barrier 24 may be made of a material capable of bending.

An inner insulation material 26 having an appropriate shape or material may be installed between the support 23 and the upper wall 22, and a finishing insulation wall 12a is installed on the inside of the connection barrier 24 so that the primary barrier 11 ) can be made possible.

In this way, the present embodiment utilizes a block material 2341 having an inner metal strip 2343 between the support 23 and the secondary insulation wall 14 and divides the connection barrier 24 up and down to seal it, flat Sealing through the connection barrier 24 is possible.

In addition, in this embodiment, the connection barrier 24 is formed between the secondary barrier 13 and the support 23 through a configuration such as the inner metal strip 2343 of the block material 2341 and the secondary step eliminating means 236. It is connected by sealing, and gas tightness can be ensured efficiently.

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

Referring to FIG. 5 , in the liquefied gas storage tank 1 according to the fourth embodiment of the present invention, the support 23 is provided to extend inward from the outer wall 21 instead of the upper wall 22 .

At this time, the support 23 has a horizontal portion 235 extending inwardly from the outer wall 21 and a vertical portion 231 fixed to the inner end of the horizontal portion 235 and parallel to the outer wall 21 . In addition, the support 23 including the vertical portion 231 and the horizontal portion 235 may form an 'A' shape or a T shape.

The horizontal portion 235 of the support 23 is provided vertically on the outer wall 21 . At this time, the outer wall 21 is provided with the horizontal reinforcing material 211 described above, and the support 23 allows the horizontal portion 235 to be provided parallel to the reinforcing material 211 on the same line, thereby avoiding stress concentration. . That is, the support 23, the outer wall 21, and the reinforcing member 211 may form a + shape. However, the horizontal portion 235 and the reinforcing material 211 may be installed intermittently rather than continuously with the outer wall 21 interposed therebetween.

The inner surface of the vertical portion 231 of the support 23 is provided parallel to the secondary barrier 13. At this time, the upper end of the connection barrier 24 may be fixed to the inner surface of the vertical portion 231, and the vertical portion 231 has a height sufficient to sufficiently secure the fixing force of the connection barrier 24.

The connection barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end fixed to the inner surface of the vertical portion 231 . Since the inner surface of the secondary barrier 13 and the vertical portion 231 may be provided side by side, the connection barrier 24 may flatly seal between the secondary barrier 13 and the support 23 . In this case, the connection barrier 24 may be made of a rigid material such as metal as well as a soft material.

A gap is formed between the vertical portion 231 of the support 23 and the secondary insulation wall 14, and the gap is covered by the connection barrier 24. However, compared to the vertical portion 231 of the support 23 and the secondary insulation wall 14, a relatively large gap is formed between the horizontal portion 235 of the support 23 and the secondary insulation wall 14.

Accordingly, a block material 2341 may be provided between the horizontal portion 235 of the support 23 and the secondary insulation wall 14 . The block material 2341 may be provided only outside the vertical portion 231 without filling the gap between the vertical portion 231 and the secondary insulating wall 14 .

Of course, the block material 2341 may also be provided to be filled between the vertical portion 231 and the secondary insulation wall 14, in which case the inner surface of the block material 2341 is parallel to the secondary barrier 13 or is secondary. It may be located outside the barrier 13.

An inner insulator 26 may be provided between the horizontal portion 235 and the upper wall 22, and the inner insulator 26 is disposed between a portion disposed between the horizontal portion 235 and the vertical portion 231, and disposed thereon. The parts and the like may be provided made of different materials from each other.

The connection barrier 24, the top portion of the vertical portion 231 where the connection barrier 24 is not provided, and the inner side of the inner insulation 26 provided above the horizontal portion 235, etc. have a finishing insulation wall ( 12a) is provided, and the primary barrier 11 may be seated on the inner surface of the primary thermal insulation wall 12 and the finished thermal insulation wall 12a.

In this way, in this embodiment, the support 23 is extended horizontally from the outer wall 21 to the opposite side of the horizontal reinforcing member 211, and the secondary barrier 13 and the support are connected through the vertical part 231 of the support 23. By sealing between (23) with the connection barrier (24), it is possible to simplify the structure and minimize leakage concerns.

In addition, the present embodiment not only shortens the working period by greatly simplifying the sealing finish structure of a complex shape, but also maximizes the sealing effect by increasing the fixed (adhesive) area of the connection barrier 24.

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

Referring to FIG. 6, the liquefied gas storage tank 1 according to the fifth embodiment of the present invention is provided with a support 23 having a vertical portion 231 and a bent portion 233 similarly to FIG. A secondary step difference eliminating means 236 is provided at the inner end of the bent portion 233 . At this time, the lower surface of the secondary step difference eliminating means 236 is fixed by the fixing end 237 installed on the bent part 233, and the upper end of the connection barrier 24 is fixed to the second step difference eliminating means 236.

However, in this embodiment, unlike FIG. 4, the block material 2341 may not be used, and in a structure in which the connection barrier 24 and the secondary barrier 13 are fixed to each other on the secondary insulation wall 14, FIG. There is a difference with

Specifically, in this embodiment, the groove 145 is provided on the inner surface of the secondary insulating wall 14 of the wall 10, and the secondary barrier from the inner surface of the secondary insulating wall 14 to the lower end of the groove 145 (13) is provided.

At this time, the lower part of the connection barrier 24 is inserted and fixed into the groove 145, the lower end extends to the lower side of the groove 145 and is fixed to the secondary barrier 13, and the upper end is fixed to the secondary step difference eliminating means 236. It is fixed and a sealing connection can be made between the secondary barrier 13 and the support 23.

In particular, the connection barrier 24 includes a lower connection barrier 241 that is bent to protrude outward and inserted into the groove 145 and whose lower end extends downward of the groove 145 and is fixed to the secondary barrier 13. At this time, the lower connection barrier 241 may be in close contact with the inner surface of the groove 145 and the metal material 243 is fixed.

The metal material 243 is inserted into the lower connection barrier 241 at the groove 145 to fix the lower connection barrier 241 to the groove 145 . As the metal material 243 is introduced into the groove 145 , the lower connection barrier 241 may be press-fitted into the groove 145 and fixed thereto.

At this time, the connection barrier 24 includes an upper connection barrier 242 having a lower end fixed to the inner surface of the metal material 243 and an upper end fixed to the secondary step difference eliminator 236 . That is, between the secondary barrier 13 and the secondary step difference eliminating means 236, the secondary barrier 13 - the lower connection barrier 241 - the metal material 243 - the upper connection barrier 242 are sealed in this order.

At this time, the inner surface of the metal material 243 is provided parallel to the inner surface of the secondary level difference eliminator 236, so that the upper connection barrier 242 seals flat between the metal material 243 and the secondary level difference eliminator 236. In addition, the upper connection barrier 242 may be made of a rigid material in addition to a flexible material.

However, since the lower connection barrier 241 must be inserted into the groove 145 through the metal material 243 and fixed, the lower connection barrier 241 is made of a flexible material compared to the upper connection barrier 242, or the upper connection barrier 242 It may be made of the same flexible material as.

In this embodiment, the second step relieving means 236 may be spaced upwards compared to the second insulating wall 14 as in FIG. 4, and the second step eliminating means 236 and the second insulating wall 14 An outer insulation 25 is used to close the gap.

At least a portion of the outer heat insulating material 25 may be filled between the outer wall 21 and the support 23, and may protrude inward between the support 23 and the secondary heat insulating wall 14. At this time, a portion protruding inward from the outer heat insulating material 25 may be provided in parallel with the secondary heat insulating wall 14 to support the upper connection barrier 242 .

Between the support 23 and the upper wall 22, one or more inner insulators 26 having appropriate shapes and materials may be installed through mastic 261, fixtures 262, etc., and the inner insulator 26 has a finishing insulation. A wall 12a may be provided. The finish insulation wall 12a may be provided to cover both the upper connection barrier 242 and the lower connection barrier 241 while covering the inner insulation 26 and the secondary step difference eliminator 236 .

As such, the present embodiment utilizes the groove 145 and the metal material 243 fitting structure when the connection barrier 24 is fixed to the secondary barrier 13, and the lower end of the upper connection barrier 242 and the metal material 243 ), it is possible to seal between the support 23 and the secondary barrier 13 by welding.

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, wrinkles 24b may be formed on the connection barrier 24 compared to the fifth embodiment described above with reference to FIG. 6 .

For reference, the connection barrier 24 of this embodiment, as in the previous fifth embodiment, the secondary barrier 13 and the support through the configuration of the lower connection barrier 241, the metal material 243, the upper connection barrier 242, etc. (23) can be sealed, or, as in the previous fourth embodiment, etc., the lower end is connected to the secondary barrier 13 and the upper end is connected directly to the support 23. ) and the support 23 may be sealed.

That is, the structure in which the connection barrier 24 seals between the secondary barrier 13 and the support 23 in this embodiment will be variously modified with reference to the previous embodiment.

For convenience, the present embodiment omits the metal material 243 from the structure of the fifth embodiment, and is directly connected to the lower end directly connected to the secondary barrier 13 and the secondary step difference eliminator 236 of the support 23. It will be described as being a structure having an integral connection barrier 24 having an upper end.

The connection barrier 24 of this embodiment is made of a mixed material of metal and non-metal, etc., and the connection barrier 24 made of such a composite material may include a flat portion 24a and a wrinkle portion 24b. The flat part 24a is a part such as the lower end laminated on the secondary barrier 13 and the upper end laminated on the support 23 (particularly the secondary step difference eliminator 236), and the secondary barrier 13 is formed by adhesion or the like. In order to be fixed to the or support 23, the secondary barrier 13 and the inner surface of the secondary step difference eliminator 236 may be provided in parallel, respectively.

The wrinkled portion 24b is provided in at least a part between the flat portions 24a. The wrinkled portion 24b may have a shape that protrudes or sinks in an inward and outward direction between the secondary barrier 13 and the support 23 . That is, the wrinkle portion 24b may be a portion formed by bending or bending the connection barrier 24 made of a composite material, and the thickness of the wrinkle portion 24b may be the same as that of the flat portion 24a.

That is, the wrinkles 24b may be curved similarly to the wrinkle structure in the primary barrier 11, and when the wrinkles 24b are processed flat, the distance between the flat portions 24a (secondary barrier 13) and the gap between the second step difference eliminating means 236).

Of course, the corrugated portion 24b may have a concave-convex structure in which the thickness is partially thinned or thickened, and the above-described bent or bent shape and the concave-convex structure in which the thickness is changed may be combined.

These wrinkles 24b are for absorbing when the mutual distance between the support 23 provided on the dome 20 and the wall 10 in contact with the liquefied gas changes due to the storage of the cryogenic liquefied gas. That is, the wrinkles 24b are provided to prepare for the occurrence of contraction in which the secondary barrier 13 is shifted downward or expansion in the direction of shifting upward with respect to the support 23, and the wrinkles 24b are provided Accordingly, the connection barrier 24 of this embodiment can prepare for contraction and expansion more flexibly.

That is, the wrinkled portion 24b is configured to be finely folded or unfolded between the flat portions 24a when the flat portions 24a are fixed to the secondary barrier 13 and the support 23, respectively, and support (23) Even if the height of the upper part of the secondary barrier 13 changes, the connection barrier 24 is smoothly maintained in a sealed state.

To this end, the connection barrier 24 is provided with wrinkles 24b in a state before the liquefied gas is stored in the accommodation space or in a state before contraction due to the cryogenic liquefied gas. That is, the connection barrier 24 may have a wrinkled portion 24b even before contraction, and the wrinkled portion 24b may be relatively more wrinkled when storing liquefied gas.

Of course, the wrinkle portion 24b is provided in a structure that can be wrinkled and can form a relatively flat surface before storing the liquefied gas, and can also be deformed to form wrinkles during storage of the liquefied gas.

The entire corrugated portion 24b may have a shape protruding outward toward the hull compared to the flat portion 24a. In this case, the finish insulating wall 12a laminated inside the connection barrier 24 may have a flat outer surface facing the connection barrier 24 .

On the other hand, in the case of the outer insulator 25 filled between the secondary insulation wall 14 and the support 23, etc., its shape may be different from that of the previous fifth embodiment due to the application of the wrinkles 24b.

The outer insulator 25 may have a shape protruding inward between the support 23 and the secondary insulation wall 14. It is disposed outwardly from the inner surface of (236).

The inner surface of the secondary step difference eliminating means 236 and the secondary barrier 13 may be disposed on the same plane to seal the connection barrier 24. In the case of the fifth embodiment, the innermost inner surface of the outer heat insulating material 25 While it is also disposed on the same plane as the inner surface of the secondary level difference eliminating means 236, in this embodiment, the innermost inner surface of the outer heat insulating material 25 is deflected outward. Therefore, in the present embodiment, a recessed portion 25a accommodating the wrinkled portion 24b may be formed between the secondary step difference eliminating means 236 and the secondary insulating wall 14 .

In addition, in this embodiment, since the corrugated portion 24b is applied to the connection barrier 24, the lower flat portion 24a fixed to the secondary barrier 13 and the secondary step eliminating means 236 of the support 23 It is also possible that the top flat portion 24a fixed thereto is deflected in an inward and outward direction. In this case, the inner surface of the secondary step difference eliminating means 236 and the secondary barrier 13 may not be disposed on the same plane but may be disposed in parallel, but as the connection barrier 24 has the wrinkle portion 24b, Sealing between the car barrier 13 and the support 23 can be sufficiently ensured.

In addition, the recessed portion 25a formed by disposing the inner surface of the outer heat insulating material 25 biased toward the outside may be applied to the finished insulation wall 12a according to the shape of the wrinkled portion 24b. That is, when at least a part of the wrinkled portion 24b protrudes inward toward the accommodation space compared to the flat portion 24a, the outer surface of the finished insulation wall 12a protrudes inward from the flat portion 24a among the wrinkled portions 24b. A depression (not shown) may be provided to accommodate the married couple.

In this way, in this embodiment, by applying the corrugation portion 24b to the connection barrier 24 including a non-metallic material, the height of the secondary barrier 13 relative to the support 23 can be varied during storage of liquefied gas. In this case, it is possible to stably maintain sealing force while the connection barrier 24 contracts/expands.

In addition, in this embodiment, the outer heat insulating material 25 forms the recessed portion 25a so that the wrinkled portion 24b is accommodated between the secondary step eliminating means 236 and the secondary insulating wall 14, The pleat shape of (24b) can be secured more freely.

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

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

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

1: liquefied gas storage tank 10: wall
11: primary barrier 12: primary insulation barrier
121: plywood 122: insulation block
12a: finishing insulation wall 13: secondary barrier
14: secondary insulation wall 141: plywood
142: insulation block 143: mastic
145 groove 20 dome
20a: dome coaming 21: outer wall
211: stiffener 22: upper wall
221: 1st level difference solving means 222: fixed end
23: support 231: vertical part
2311: stud 233: bend
234: protrusion 2341: block material
2342: sealing layer 2343: inner metal strip
2344: upper metal strip 235: horizontal portion
2351: outer part 2352: inner part
236: 2nd level difference eliminating means 237: fixed end
24: connection barrier 24a: flat portion
24b: wrinkles 241: lower connection barrier
242: upper connection barrier 243: metal material
25: outer insulator 25a: depression
26: inner insulation 261: mastic
262: fixture

Claims (6)

A primary barrier made of a metal material forming a storage space for accommodating liquefied gas, a primary insulation wall disposed outside the primary barrier, a secondary barrier provided outside the primary insulation wall, and the second barrier a wall including a secondary thermal insulation wall disposed outside the primary barrier and forming a thermal insulation space between the primary barrier and the secondary barrier and outside the secondary barrier; and
A dome provided on the wall forming an upper surface of the storage space to close the heat insulation space,
the dome,
an outer wall having a certain height toward the upper side of the storage space;
an upper wall supported by the outer wall and to which the primary barrier is connected to an inner end;
a support extending downward from the upper wall inside the outer wall; and
A connection barrier sealing between the secondary barrier and the support,
The connection barrier is
A wrinkle portion protruding or sinking in an inward and outward direction is provided between the secondary barrier and the support,
The support is
A vertical portion positioned outside the secondary barrier and parallel to the outer wall, and a bent portion bent inward from a lower portion of the vertical portion, and a second step relieving means in which the connection barrier is fixed to the inner surface is provided on the inner side of the bent portion. provided at the end,
the dome,
an inner heat insulating material fixed to the inside of the vertical portion; and
Further comprising an outer heat insulating material at least partially filled between the outer wall and the support,
The outer heat insulating material has a form protruding inward between the support and the secondary heat insulating wall, the liquefied gas storage tank. delete The method of claim 1, wherein the connection barrier,
A liquefied gas storage tank, wherein a flat part is provided at a lower end connected to the secondary barrier and an upper end connected to the secondary step difference eliminating means, and the wrinkle part is provided in a portion between the flat parts. delete The method of claim 1, wherein the inner surface closest to the storage space in the outer heat insulating material,
The liquefied gas storage tank, which is disposed outwardly from the inner surface of the secondary step eliminator, and has a depression formed between the secondary step eliminator and the secondary insulation wall to accommodate the wrinkled portion. A vessel having the liquefied gas storage tank according to any one of claims 1, 3 and 5.

Images