KR20230018997A - 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 includes: a wall including a primary barrier made of metal and forming a storage space for containing liquefied gas, a primary insulation wall provided outside the primary barrier, a secondary barrier provided outside the primary insulation wall, and a secondary insulation wall provided outside the secondary barrier, and independently forming first and second insulated spaces between the primary barrier and the secondary barrier and outside the secondary barrier, respectively; and a dome provided on the upper surface of the storage space and penetrating the wall to connect the storage space to the outside. The dome includes: a vapor pipe penetrating the wall and making evaporated gas flow from the storage space to the outside; and a sealing part extending from the outer periphery of the vapor pipe and sealed to the secondary barrier. The sealing part includes: a first plate having a first horizontal part extending peripherally from an outer portion of the wall in the vapor pipe and a first vertical part extending inward from the first horizontal part; a second plate having a second vertical part sealed and connected to the first vertical part and a second horizontal part parallel to the first horizontal part inside the first horizontal part; a third plate having a third vertical part sealed and connected to the second vertical part and a third horizontal part having one end sealed and connected to the secondary barrier; and a connection barrier connecting the third horizontal part and the secondary barrier. Accordingly, the sealing properties and structural stability of the dome can be secured.

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. In addition, a dome is formed on the upper surface of the liquefied gas storage tank for the inflow and outflow of liquefied gas.

However, the dome can be applied with a structure for securing insulation performance and safety by supplying nitrogen gas to the inside of the insulation space while sealing the insulation space of the second floor, respectively. In the management of the insulation space and sealing of the dome, continuous Research and development are taking place.

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 arrange a configuration for managing the insulation space separately from the dome, or arrange it in the dome but improve the structure, thereby sealing the barrier. It is to provide a liquefied gas storage tank and a ship including the same that can secure the efficiency of insulation space management while ensuring the

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 provided outside the primary barrier, and a primary insulation wall. It includes a secondary barrier provided on the outside and a secondary insulation wall provided outside the secondary barrier, and the first and second insulation spaces are provided between the primary barrier and the secondary barrier and outside the secondary barrier, respectively. A wall that independently forms; and a dome provided on an upper surface of the storage space and passing through the wall to communicate the storage space with the outside. and a sealing portion extending from an outer circumference of the vapor pipe and sealed to the secondary barrier, wherein the sealing portion comprises: a first horizontal portion extending from an outer portion of the wall to the periphery of the vapor pipe; a first plate having a first vertical portion extending inwardly from the portion; a second plate having a second vertical portion sealedly connected to the first vertical portion and a second horizontal portion provided inside the first horizontal portion and parallel to the first horizontal portion; a third plate having a third vertical portion sealedly connected to the second vertical portion and a third horizontal portion having one end sealedly connected to the secondary barrier; and a connection barrier connecting the third horizontal portion and the secondary barrier.

Specifically, the second horizontal portion extends in a direction from the second vertical portion toward the vapor pipe so that one end thereof is sealed and connected to the vapor pipe, and the third horizontal portion extends from the vapor pipe in the third vertical portion. It extends in a direction away from each other so that one end may be sealed and connected to the second barrier.

Specifically, the secondary barrier adjacent to the vapor pipe is provided to expose the secondary thermal insulation wall, and the connection barrier has one end at a portion of the secondary thermal insulation wall that is not covered by the secondary barrier. a first connection barrier made of metal which is fixed and whose other end extends beyond the secondary insulation wall and is sealedly connected to the third horizontal portion; and a second connection barrier sealingly connecting an inner surface of the first connection barrier to the second connection barrier.

Specifically, the first connection barrier has one end bent outward, accommodated inside the secondary insulation wall and fixed by bolting, and the other end welded to the third horizontal portion, and the second connection barrier , One end may be fixed to the secondary barrier by bonding, and the other end may be fixed to the inner surface of the first connection barrier by bonding.

Specifically, the dome may include an outer heat insulating material provided on the outside of the third horizontal portion between the secondary insulation wall and the first to third vertical portions; and a connection insulation wall provided inside the connection barrier between the primary insulation wall and the vapor pipe, and having one end spaced apart from the vapor pipe.

Specifically, the dome further includes a heat insulation space pipe communicating the first heat insulation space with the outside, and the heat insulation space pipe passes through the first horizontal portion and the second horizontal portion to an inner side of the second horizontal portion. An inner end is provided, and the dome may further include a support block provided between the second horizontal portion and the connection heat insulation wall and supporting the inner end of the heat insulation space pipe.

Specifically, the insulated space pipe may have a hole penetrating the first horizontal portion and the second horizontal portion and penetrating between the first horizontal portion and the second horizontal portion.

Specifically, a sheath portion surrounding the vapor pipe is further included outside the wall, and the secondary insulation space is surrounded by the sheath portion, the second vertical portion, the first vertical portion, and the first horizontal portion. It can communicate with space.

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

The liquefied gas storage tank and the vessel including the same according to the present invention not only secures sealing properties and structural stability for the dome, but also efficiently and safely injects inert gas into the insulation space and detects gas leaks or pressure sensing. make it happen

1 is a 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 the present invention.
3 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.
4 is a partial plan view of a liquefied gas storage tank according to a first embodiment of the present invention.
5 is an enlarged view of part A of FIG. 3 .
6 is an enlarged view of part B of FIG. 5 .
7 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.
8 is an enlarged view of part C of FIG. 7 .
9 is a partial cross-sectional view of the liquefied gas storage tank according to the first embodiment of the present invention.
10 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.
11 is a partial plan view of a liquefied gas storage tank according to a second embodiment of the present invention.
12 is an enlarged view of part D of FIG. 10 .
13 is an enlarged view of part E of FIG. 12 .
14 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.
FIG. 15 is a top cross-sectional view of portions F1 and F2 of FIG. 14 .

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. .

In addition, it is noted that the inward and outward direction is an expression defined by considering that the direction toward the center of the storage space is the inward direction.

1 is a perspective view of a liquefied gas storage tank according to the present invention, and FIG. 2 is a partial cross-sectional view of the liquefied gas storage tank according to the present invention.

1 and 2, the liquefied gas storage tank 1 according to the present invention is mounted on the hull (H). At this time, the liquefied gas storage tank (1) may be a membrane type in which the bulkhead structure of the hull (H) forms the outer surface 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 (H) .

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 H (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 a heat insulating layer is directly installed on the bulkhead of the hull (H). However, since the liquefied gas storage tank 1 may be provided as an independent type, it is noted that the expression hull H 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, a dome 20 or the like is installed on the upper surface of the wall 10 for the inflow and outflow of liquefied gas. 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 and insulating blocks. The plywood is provided on the inside of the primary insulating wall 12, and an anchoring unit (not shown) is fixed to the plywood. 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 heat insulating block is provided outside the primary heat insulating wall 12 and has heat insulating properties. The insulating block may be made of a polyurethane foam block or a box block containing an insulating material. This insulation block 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 H 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 a primary heat insulating space.

A connection insulating wall 121 is filled between a pair of adjacent primary insulating walls 12 to prevent breakage of the insulating structure. The connection insulating wall 121 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 insulation wall 12 and the connection insulation wall 121 may be provided side by side with each other, and the primary barrier 11 on the inner surface of the connection insulation wall 121 and the inner surface of the primary insulation wall 12 ) 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, for example, a composite sheet in which a metal sheet and a glass fiber sheet are variously combined, or 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 . A connection barrier (not shown) may be laminated to seal the gap between the secondary insulation walls 14, and the secondary barrier 13 on the secondary insulation wall 14 is made of a relatively rigid material, , The connection barrier 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 similarly to the primary insulation wall 12, and has a structure in which plywood and insulation blocks are laminated in the same / similar manner to the primary insulation wall 12.

However, the stacking order of the plywood and the insulating block of the secondary insulating wall 14 may be opposite to that of the primary insulating wall 12. While the primary insulation wall 12 is provided with a plywood anchoring unit provided on the inner surface for welding fixation of the primary barrier 11, the secondary insulation wall 14 is fixed to the hull (H) side. A plywood may be provided on the outer surface.

The secondary insulation wall 14 may be fixed using bolts to the inner surface of the hull (H), and may also be fixed using mastic. Mastic fixes the plywood of the secondary insulation wall 14 to the hull (H) as an adhesive.

The secondary insulation wall 14 is disposed in a closed space between the secondary barrier 13 and the hull H, and the space in which the secondary insulation wall 14 is disposed may be referred to as a secondary insulation space.

That is, the wall 10 goes from the inside to the outside, forming a primary barrier 11 - a primary insulation space (primary insulation wall 12) - a secondary barrier 13 - a secondary insulation space (second insulation wall 14 )) - It is provided to be stacked in order of the hull (H), and the primary insulation space and the secondary insulation space are 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.

In particular, the liquefied gas storage tank 1 of the present invention may be applied to a ship, and the ship may include an inner deck (ID) forming the upper surface of the storage space and a trunk deck (TD) provided outside the inner deck (ID). It may be, the dome 20 may be provided in a form penetrating both the inner deck (ID) and the trunk deck (TD).

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

The dome 20 may be provided in plurality to independently take charge of the inflow and outflow of liquefied gas and evaporation gas, and the dome 20 for the inflow and outflow of liquefied gas is referred to as a tank dome 20a, and evaporates. The dome 20 for inflow and outflow of gas may be referred to as a vapor dome 20b.

At this time, the pump tower 40 may be provided by extending downward from the vapor dome 20b for the inflow and outflow of liquefied gas, and the tank dome 20a is disposed at a position spaced apart from the vapor dome 20b, and the pump tower 40 ), it can receive boil-off gas and discharge it to the outside.

Hereinafter, the dome 20 according to an embodiment of the present invention will be described with reference to FIG. 3 and the like. However, it should be noted that the dome 20 described below may be a vapor dome 20b.

3 is a partial cross-sectional view of a liquefied gas storage tank according to the first embodiment of the present invention, FIG. 4 is a partial plan view of the liquefied gas storage tank according to the first embodiment of the present invention, and FIG. 5 is part A of FIG. , and FIG. 6 is an enlarged view of part B of FIG. 5 .

7 is a partial cross-sectional view of a liquefied gas storage tank according to the first embodiment of the present invention, FIG. 8 is an enlarged view of part C of FIG. 7, and FIG. 9 is a liquefied gas storage tank according to the first embodiment of the present invention. A partial cross-section of the tank.

3 to 9, the dome 20 provided in the liquefied gas storage tank 1 according to the first embodiment of the present invention is provided on the upper surface of the storage space and penetrates the wall 10 to store It connects the space with the outside.

The dome 20 includes a vapor pipe 21, a seal 22, a connection barrier 25, a connection insulation wall 26, a sheath 27, and the like.

The vapor pipe 21 penetrates the wall 10 and allows the boil-off gas in the storage space to flow outside. The vapor pipe 21 may have a length and shape that communicates the storage space and the outside in order to discharge the boil-off gas generated in the storage space to the outside.

Since the vapor pipe 21 penetrates the entire laminated structure of the wall 10, a structure for independently dividing the primary insulation space and the secondary insulation space may be applied to the vapor pipe 21. This will be described in detail through the sealing portion 22.

The sealing portion 22 extends from the outer periphery of the vapor pipe 21 and seals the secondary barrier 13. That is, even if the secondary barrier 13 of the wall 10 is penetrated by the vapor pipe 21, the sealing portion 22 is separated from the secondary barrier 13 so that the primary insulation space and the secondary insulation space are isolated from each other. It closes between the vapor pipes 21.

To this end, the sealing part 22 includes a first plate 221 , a second plate 222 and a third plate 223 . The first plate 221 extends from the vapor pipe 21 to the periphery, and for example, may extend from the outer portion of the wall 10 in the outer circumferential direction in the longitudinal direction of the vapor pipe 21 .

Specifically, the first plate 221 is a direction perpendicular to the longitudinal direction of the vapor pipe 21 on the surface of the vapor pipe 21 (a direction relatively parallel to the upper surface of the storage space, which may be defined as a horizontal direction) It may have a first horizontal portion 221a extending to and a first vertical portion 221b extending inwardly from the first horizontal portion 221a.

A separate vertical member (not shown) may be added to the circumference of the first horizontal portion 221a in order to seat and fix the outer insulator 24 to be described later, in which case the first horizontal portion 221a The cross section will be able to form an 'A' shape.

As the first vertical portion 221b extends vertically from the first horizontal portion 221a at a predetermined point on the inner surface of the first horizontal portion 221a, the first horizontal portion 221a and the first vertical portion 221b As shown in the drawing, the cross section may form a 'T' shape. Alternatively, as the first vertical portion 221b extends inward from the circumference of the first horizontal portion 221a, it is also possible to form a 'L' shape in cross section.

The second plate 222 includes a second horizontal portion 222a sealedly connected to the vapor pipe 21 and a second vertical portion 222b sealedly connected to the first vertical portion 221b. At this time, one end of the second horizontal portion 222a is connected to the second vertical portion 222b.

The first horizontal portion 221a of the first plate 221 and the second horizontal portion 222a of the second plate 222 are both connected to the vapor pipe 21, and the first vertical portion of the first plate 221 As the portion 221b and the second vertical portion 222b of the second plate 222 are connected to each other, the first horizontal portion 221a, the first vertical portion 221b, the second vertical portion 222b, and the second vertical portion 222b are formed. A space surrounded by the second horizontal portion 222a is formed, and the space may be isolated from the primary insulation wall 12 . However, the space formed by the first and second plates 221 and 222 may be maintained at the same internal pressure as the primary insulation space.

The second vertical portion 222b may overlap and be fixed to the first vertical portion 221b as shown in the drawing, or may be fixed butt against the first vertical portion 221b unlike the drawing. The cross section of the second plate 222 may have a 'Q' shape as shown in the drawing, or may have a 'L' shape unlike the drawing. A connection method between the vertical portion 222b and the first vertical portion 221b may be different.

The third plate 223 has a third horizontal portion 223a sealedly connected to the secondary barrier 13 and a third vertical portion 223b sealedly connected to the second vertical portion 222b. The third horizontal portion 223a may extend in a direction away from the vapor pipe 21 based on the third vertical portion 223b, that is, in a direction toward the secondary barrier 13, and one end is the third vertical portion ( 223b) and the other end may be placed at a certain point spaced apart from the secondary barrier (13).

The third vertical portion 223b may overlap and be fixed to the second vertical portion 222b. In this case, the third vertical portion 223b may be disposed relatively far from the vapor pipe 21 compared to the second vertical portion 222b.

As the first vertical part 221b and the third vertical part 223b are provided on the outer surface of the second vertical part 222b while being spaced apart or in contact with each other, the third vertical part 223b is the first vertical part ( 221b) and may be provided side by side up and down. The overlapping height of the third vertical portion 223b and the second vertical portion 222b may vary depending on the position of the second horizontal portion 222a and the like. In addition, the third plate 223 having the third vertical portion 223b may have a cross section of 'ㅗ' shape as shown in the drawing, or may have a 'ㄴ' shape, and the outer shape is rectangular or polygonal. can have

The second horizontal portion 222a of the second plate 222 extends from the second vertical portion 222b in a direction toward the vapor pipe 21 so that one end thereof is sealed and connected to the vapor pipe 21, and the third plate ( 223), the third horizontal portion 223a extends from the third vertical portion 223b in a direction away from the vapor pipe 21, and one end is sealed and connected to the secondary barrier 13, and the second vertical portion 222b Since the and the third vertical portion 223b are sealedly connected, the vapor pipe 21 and the secondary barrier 13 may be mutually sealed through the second and third plates.

In this case, the first plate 221 may cooperate with the second plate 222 to form a separate space separated from the primary insulation space. The space formed by the first and second plates 221 and 222 is It is an independent space separated from the primary insulation space, but it can be managed with the same pressure as the primary insulation space as mentioned above.

However, as the third horizontal portion 223a of the third plate 223 is not directly connected to the vapor pipe 21, in the case of a space surrounded by the second plate 222 and the third plate 223, It may be provided to communicate with the primary insulation space inside the secondary barrier 13. That is, since the primary insulation space communicates with the space surrounded by the second horizontal portion 222a and the second and third vertical portions 222b and 223b, the space formed by the second and third plates 222 and 223 also It can be interpreted as an extended part of the primary insulation space.

An inner heat insulating material 23 may be installed in the space partitioned by the first and second plates 221 and 222 to implement a heat insulating function. The inner insulator 23 may have a shape corresponding to the shape of the first and second plates 221 and 222, and for example, the second plate 222 has a cross-sectional shape of an 'A' shape and a second vertical portion. When (222b) overlaps with the first vertical portion (221b) and is welded, a step is applied to the circumference of the inner insulator 23, so that the outer portion is applied to both the first vertical portion (221b) and the second vertical portion (222b). Sufficient insulation can be achieved by contacting each other.

After the first horizontal portion 221a of the first plate 221 is connected to the vapor pipe 21 by welding or the like, the first horizontal portion 221a, the first vertical portion 221b, and the vapor pipe 21 The inner heat insulating material 23 is filled in the enclosed space. The second vertical portion 222b of the second plate 222 is connected to the first vertical portion 221b of the first plate 221 by welding or the like.

Therefore, the space formed by the first and second plates 221 and 222 is completely filled with the inner heat insulating material 23, so that a heat penetration blocking function can be effectively realized.

The first to third vertical portions 221b, 222b, and 223b may be provided in a spaced apart state from the secondary insulation wall 14 of the wall 10, and the secondary insulation wall 14 and the first to third An external heat insulating material 24 may be installed between the vertical portions 221b, 222b, and 223b. The outer insulator 24 is provided in a form in which at least a portion faces the inner insulator 23 with the first vertical portion 221b interposed therebetween, and may be seated on the third horizontal portion 223a, and the wall 10 It is possible to prevent breakage of insulation between the and the vapor pipe 21 .

The connection barrier 25 connects the third horizontal portion 223a and the secondary barrier 13 . The other end of the third horizontal portion 223a may be indirectly connected to the secondary barrier 13, and the secondary barrier 13 provided on the secondary insulation wall 14 of the wall 10 and the third horizontal portion ( 223a) may be sealed and connected to each other through the connection barrier 25.

The connection barrier 25 is made of the same or similar material as the secondary barrier 13 and may be a composite sheet. In this case, the connection barrier 25 may be fixed to the secondary barrier 13 and the third horizontal portion 223a by bonding or the like. Alternatively, the connection barrier 25 may be made of a material such as metal, bonded to the secondary barrier 13 made of a composite sheet, and welded to the third horizontal portion 223a. In addition, the connection barrier 25 may be formed of various shapes or materials capable of sealingly connecting the secondary barrier 13 and the third plate 223 to each other.

The connection insulation wall 26 is provided inside the connection barrier 25 between the primary insulation wall 12 and the vapor pipe 21 . The primary insulation wall 12 may have a size that exposes a portion of the secondary barrier 13 for connection between the secondary barrier 13 and the sealing portion 22, and at this time, on the inside of the connection barrier 25 Connecting insulating walls 26 may be laminated.

As described above with reference to FIG. 2 , the connection insulation wall 26 may have a form in which an insulation block and a plywood are stacked, and a portion of the plywood may be stacked on the connection barrier 25 .

The connection insulating wall 26 may have one end in contact with the primary insulating wall 12 and the other end spaced apart from the vapor pipe 21 . Through this, the space partitioned by the second and third plates 222 and 223 and the primary thermal insulation space provided with the primary thermal insulation wall 12 can communicate smoothly.

Of course, if the space partitioned by the second and third plates 222 and 223 can be communicated with the primary insulation space by changing the shape of the plywood, the other end of the connection insulation wall 26 connects to the vapor pipe 21 Contact is also possible. Also, if necessary, as shown in the drawing, a wood block may be provided in a space surrounded by the second and third plates 222 and 223.

The sheath 27 is provided to surround the vapor pipe 21 from the outside of the wall 10 . As mentioned above, the upper surface of the storage space is the inner deck (ID), and the trunk deck (TD) may be provided outside the inner deck (ID). It may be provided in the form of a pipe passing through the trunk deck (TD) and having an inner end connected to the outer surface of the inner deck (ID) so as to surround the vapor pipe 21 between (TD) and on the outside of the trunk deck (TD). .

As described above, since the sealing part 22 is sealedly connected to the secondary barrier 13, the secondary insulation space may communicate with the outside through an opening (not shown) provided in the inner deck ID. . At this time, the sheath part 27 forms a space surrounding the vapor pipe 21, and the space formed by the sheath part 27 may communicate with the secondary insulation space.

Specifically, the secondary insulation space is a space surrounded by the sheath part 27, the third vertical part 223b, the second vertical part 222b, the first vertical part 221b, and the first horizontal part 221a can be connected with In this case, if the sheath part 27 is used, access to the secondary insulation space is possible from the outside of the inner deck ID. Therefore, a secondary insulation space pipe 31b may be provided in the sheath 27 to inject an inert gas or the like into the secondary insulation space or check the internal pressure of the secondary insulation space.

At this time, a plurality of secondary insulation space pipes 31b are provided, and as shown in FIG. 4, the secondary insulation space pipe 31b for injecting inert gas and the secondary insulation for checking the pressure in the secondary insulation space It may include a space pipe (31b) and the like, and the plurality of secondary insulation space pipes (31b) may have different diameters, and may be spaced apart from each other at different points around the sheath part 27 to exclude mutual interference. can

As described in the secondary insulation space pipe 31b, a configuration for realizing the same function is required for the primary insulation space. However, in this embodiment, the secondary insulation space pipe 31b is provided in the sheath portion 27 of the dome 20, while the primary insulation space pipe 31a is spaced apart from the dome 20 to the dome 20. (20) can be provided separately. Hereinafter, the passage part 30 of the insulating space for disposing the primary insulating space pipe 31a will be described.

The heat insulation space passage 30 is provided at a point spaced apart from the dome 20 in the wall 10 . For example, the heat insulation space passage 30 may be provided to pass through the inner deck ID and the trunk deck TD at a position spaced apart from the dome 20 in the left and right directions on the upper surface of the storage space.

The passage part 30 of the insulating space can pass through the secondary barrier 13 of the wall 10 to communicate the primary insulating space with the outside. To this end, the insulation space passage portion 30 includes a primary insulation space pipe 31a, a rim portion 32, a barrier portion 33, a connection barrier 34, a connection insulation wall 35, and a sheath portion 36 can do. For reference, it should be noted that even if two or more configurations in this specification use the same expression, different reference numerals may be interpreted as different configurations, and vice versa.

The primary insulation space pipe 31a is provided to pass through the primary insulation wall 12 from the outside of the wall 10 . Unlike the vapor pipe 21, the primary insulation space pipe 31a is provided so as not to penetrate the primary barrier 11, and its inner end may be located within the primary insulation space.

As described for the vapor pipe 21, the primary insulation space pipe 31a may be sealed and connected to the secondary barrier 13 to independently partition the primary insulation space and the secondary insulation space. For this purpose, the rim portion 32 and the connection barrier 34 are used.

The rim portion 32 extends from the primary insulation space pipe 31a to the periphery. In particular, the rim portion 32 may extend from the surface of the primary insulating space pipe 31a to the periphery in parallel or in parallel with the secondary barrier 13 . When the rim portion 32 extends parallel to the secondary barrier 13 , the rim portion 32 and the secondary barrier 13 may be interconnected by a connection barrier 34 . On the other hand, when the rim portion 32 extends in parallel (shifted) with the secondary barrier 13, in order to solve the misalignment between the rim portion 32 and the secondary barrier 13 in the inward and outward direction, the rim portion 32 and the connection barrier A barrier portion 33 may be added between (34). Although the latter case is shown in FIG. 8 in this embodiment, the former case may also be included in this embodiment.

The rim portion 32 is provided with a stepped inner surface, one end connected to the primary insulation space pipe 31a is parallel to the secondary barrier 13, and the other end far from the primary insulation space pipe 31a is a secondary barrier ( 13) and may have a parallel form. At this time, a barrier portion 33 may be added to the other end of the rim portion 32 .

The barrier wall portion 33 is provided on the inside of the rim portion 32 . The barrier portion 33 is made of the same or similar material as the secondary barrier 13, and may be fixed to the inner surface of the rim portion 32 by bonding or the like. Of course, as described above, depending on the shape of the rim portion 32, the barrier portion 33 may be omitted.

The connection barrier 34 connects the rim portion 32 or the barrier portion 33 to the secondary barrier 13 . The connection barrier 34 may be provided with a composite sheet identical to or similar to the secondary barrier 13, one end overlapped and bonded to the barrier portion 33, and the other end overlapped and bonded to the secondary barrier 13. there is.

At this time, in the connection barrier 34, between the barrier portion 33 and the secondary barrier 13 is allocated as a non-bonding area in which bonding is not performed, so that the connection barrier 34 can be deformably provided at least in part. Through the connection barrier 34 can be prepared for contraction expansion.

The connection insulation wall 35 is provided on the inside of the connection barrier 34 and may surround the inner end of the primary insulation space pipe 31a. The connection insulation wall 35 may be provided between the primary insulation wall 12 and the primary insulation space pipe 31a, and also between the inner end of the primary insulation space pipe 31a and the primary barrier 11. can also be provided. Therefore, the connection insulating wall 35 may be provided in a form to accommodate the inner end of the primary insulating space pipe 31a.

The sheath part 36 is provided to surround the primary heat insulation space pipe 31a from the outside of the wall 10 . The sheath part 36 may be disposed outside the inner deck ID and may seal the secondary insulation space.

An outer insulator 37 may be provided between the secondary insulation wall 14 and the primary insulation space pipe 31a for continuity of insulation. However, as the inner deck (ID) has an opening for the penetration of the primary insulation space pipe (31a) and the inner deck (ID) and the primary insulation space pipe (31a) are not sealed, the secondary insulation space is It may be communicated to the outside through the outer heat insulating material 37 and the opening portion.

At this time, the sheath part 36 is provided on the outside of the inner deck ID and sealedly connected to the pipe 31a of the primary insulation space, thereby closing the secondary insulation space. This sheath part 36 may be fixed through a plurality of brackets (not shown) provided on the outer circumference of the primary insulation space pipe 31a for structural stability.

In addition, an outer heat insulating material 37 is provided between the sheath part 36 and the primary heat insulating space pipe 31a. That is, the outer insulator 37 may be filled between the secondary insulation wall 14 and the primary insulation space pipe 31a and between the sheath portion 36 and the primary insulation space pipe 31a.

The sheath part 36 may be provided for each of the inner deck (ID) and the trunk deck (TD). For example, the sheath part 36 is fixed to the inner deck ID between the inner deck ID and the trunk deck TD, and the inner sheath part 361 surrounding the primary insulation space pipe 31a, and the trunk deck ( TD) may include an outer sheath 362 surrounding the primary insulation space pipe 31a from the outside.

Since the secondary insulation space is closed by the inner sheath 361, the outer sheath 362 may be provided for supporting and insulating the pipe 31a of the primary insulation space, regardless of the closing of the insulation space. . In this case, the outer sheath portion 362 is provided independently of the inner sheath portion 361, and an external heat insulating material 38 may be provided between the primary insulation space pipe 31a and the outer sheath portion 362. The external insulator 38 may be made of the same or similar material as the external insulator 37 provided between the primary insulation space pipe 31a and the inner sheath 361 . In addition, the outer sheath 362 may also be fixed to the primary insulation space pipe 31a using a bracket (not shown) or the like.

As such, in this embodiment, access to the secondary insulation space uses the secondary insulation space pipe 31b provided in the dome 20, and access to the primary insulation space is provided separately from the dome 20. Since the primary insulation space pipe 31a of the passage part 30 of the insulation space can be used, sealing reliability of the sealing part 22 of the dome 20 can be guaranteed.

Alternatively, the present invention, unlike the above, may further include an embodiment in which the secondary insulation space pipe 31b is installed in the insulation space passage 30 installed at a position spaced apart from the dome 20. Specifically, in this modified embodiment, a secondary insulation space pipe 31b may be provided around the inner sheath 361 of the passage part 30 of the insulation space.

In this case, since the insulation space pipe 31 can be removed from the dome 20, the structure of the dome 20 can be further simplified. In addition, since inert treatment and pressure management for the first and second insulation spaces can be performed at a location away from the dome 20, work efficiency can be increased.

10 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention, FIG. 11 is a partial plan view of a liquefied gas storage tank according to a second embodiment of the present invention, and FIG. 12 is part D of FIG. 10 , and FIG. 13 is an enlarged view of part E of FIG. 12 .

14 is a partial sectional view of a liquefied gas storage tank according to a second embodiment of the present invention, and FIG. 15 is a plan view of parts F1 and F2 of FIG. 14 . For reference, the left view of FIG. 15 is a plan view of the F1 portion of FIG. 14, and the right view of FIG. 15 is a plan view of the F2 portion of FIG.

Hereinafter, with reference to FIGS. 10 to 15, the liquefied gas storage tank 1 according to the second embodiment of the present invention will be described, and parts omitted from the description can be replaced with the previous contents.

In this embodiment, all of the heat insulation space pipes 31 may be provided in the dome 20 . That is, in the previous embodiment, only the secondary insulation space pipe 31b was provided in the dome 20, but in this embodiment, the primary insulation space pipe 31a may be provided in the dome 20. In addition, the structure of the seal 22 or the like may be partially changed. Hereinafter, the difference between the sealing part 22 and the insulating space pipe 31 of the present embodiment compared to the previous embodiment will be described in detail.

The sealing part 22 of this embodiment is similar to the previous embodiment in that it includes a first plate 221, a second plate 222 and a third plate 223, but the second and third plates 222, 223) may be different in the connection method.

The first plate 221 of this embodiment includes a first horizontal portion 221a extending from the outer portion of the wall 10 to the periphery in the vapor pipe 21 and an inward extending portion from the first horizontal portion 221a. It is similar to the previous embodiment in that it has the first vertical portion 221b.

The second plate 222 of this embodiment is the same as the previous embodiment in that the second horizontal portion 222a is sealed to the vapor pipe 21, but the second vertical portion 222b of this embodiment is the first vertical portion. It may be different from the previous embodiment in that it is disposed side by side with (221b) and connected by butt welding.

In addition, the third plate 223 of this embodiment is the same as that of the previous embodiment in that the third horizontal portion 223a is connected to the connection barrier 25, but the third vertical portion 223b of this embodiment has the first It is different from the previous embodiment in that it is vertically offset from the vertical portion 221b and connected to the inside of the second vertical portion 222b by overlapping welding.

In the present embodiment, a separate space formed to be separated from the primary insulation space by the first and second plates 221 and 222 may communicate with the primary insulation space through the insulation space pipe 31 . This will be described later.

As mentioned in the previous embodiment, the shape or connection method of the first to third plates 221, 222, and 223 may be variously changed, and the present invention covers all examples of changes based on known technologies. Of course.

In this embodiment, the third horizontal portion 223a of the third plate 223 may be connected to the secondary barrier 13 through the connection barrier 25 . The connection barrier 25 may be made of a composite sheet identical to or similar to the secondary barrier 13, one end bonded to the secondary barrier 13 and the other end bonded to the third horizontal portion 223a, etc. can be fixed as

Alternatively, as shown in the drawing, the connection barrier 25 may have a multi-layered structure in which the first connection barrier 251 and the second connection barrier 252 overlap. The secondary barrier 13 adjacent to the vapor pipe 21 may be provided to have a smaller width than the secondary thermal insulation wall 14 to expose a part of the inner surface of the secondary thermal insulation wall 14, the connection barrier ( 25 may connect the first connection barrier 251 to the sealing portion 22 and connect the second connection barrier 252 between the second barrier 13 and the first connection barrier 251 .

One end of the first connection barrier 251 is fixed to a portion of the secondary insulation wall 14 that is not covered by the secondary barrier 13 . The first connection barrier 251 may be made of a metal material such as SUS, and may be fixed to the secondary insulation wall 14 by bolting or the like. At this time, one end of the first connection barrier 251 is bent outward, accommodated inside the secondary insulation wall 14, and fixed with bolting, thus unnecessary irregularities between the secondary barrier 13 and the sealing portion 22. occurrence of the site can be prevented.

The other end of the first connection barrier 251 may extend beyond the secondary insulation wall 14 and be sealed and connected to the third horizontal portion 223a. In this case, the other end of the first connection barrier 251 is welded to the third horizontal portion 223a, and the first connection barrier 251 and the third plate 223 may be made of the same material.

The second connection barrier 252 seals and connects the inner surface of the first connection barrier 251 to the secondary barrier 13 . One end of the second connection barrier 252 may be fixed to the inner surface of the secondary barrier 13 by bonding or the like, and the other end may be fixed to the inner surface of the first connection barrier 251 by bonding or the like. The second connection barrier 252 may be made of a relatively flexible material compared to the first connection barrier 251 and may be made of the same or similar material as the second barrier 13 .

In this way, in this embodiment, between the second barrier 13 and the third horizontal portion 223a of the sealing portion 22, the first connection barrier 251 made of metal is firmly fixed by bolting and welding, and the composite By fixing the material of the second connection barrier 252 by bonding or the like, sealing reliability and structural stability may be guaranteed.

A connection insulation wall 26 is installed inside the connection barrier 25. The connection insulation wall 26 is provided inside the connection barrier 25 between the primary insulation wall 12 and the vapor pipe 21 . One end of the connection insulation wall 26 is provided to come into contact with the primary insulation wall 12, while the other end of the connection insulation wall 26 is spaced apart from the vapor pipe 21.

The reason for leaving a gap between the connection insulating wall 26 and the vapor pipe 21 is to ensure smooth communication between the primary insulating space and the inner end of the primary insulating space pipe 31a, which will be described later. The connection insulation wall 26 has a structure in which an insulation block and a plywood are laminated. At this time, when the connection insulation wall 26 is configured to come into contact with the vapor pipe 21, the primary insulation space and the insulation space are formed due to the plywood. This is because the pipe 31 can be isolated.

The insulated space pipe 31 of this embodiment includes a primary insulated space pipe 31a and a secondary insulated space pipe 31b. As the secondary insulation space pipe 31b is provided in the sheath part 27 in the previous embodiment, the secondary insulation space pipe 31b is also provided in the sheath part 27 in this embodiment. Since the space surrounded by the sheath portion 27, the first to third vertical portions 221b, 222b, and 223b, and the first horizontal portion 221a may communicate with the secondary insulation space, only the sheath portion 27 Through the penetrating secondary insulation space pipe 31b, internal pressure control and inert treatment for the secondary insulation space can be smoothly performed.

On the other hand, the primary heat insulation space pipe 31a of this embodiment may be provided to penetrate the sealing portion 22 of the dome 20, unlike the one provided separately at a position spaced apart from the dome 20 in the previous embodiment. . Specifically, the primary insulation space pipe 31a passes through the first horizontal portion 221a and the second horizontal portion 222a, and an inner end may be provided inside the second horizontal portion 222a.

As described above, since the second plate 222 of the sealing portion 22 is sealed and connected to the vapor pipe 21, the first horizontal portion 221a, the first vertical portion 221b, and the second vertical portion 222b And the space surrounded by the second horizontal portion 222a is isolated from the primary insulation space. Therefore, in this embodiment, in order for the pipe 31a of the primary insulation space to communicate with the primary insulation space, the inner end of the primary insulation space penetrates not only the first horizontal portion 221a but also the second horizontal portion 222a. It will be prepared in the form of

At this time, the inner end of the primary insulation space pipe 31a may be located outside the connection insulation wall 26, and the second horizontal portion 222a, the second vertical portion 222b, and the third vertical portion 223b It can be placed in a space surrounded by Since the space where the inner end of the primary insulation space pipe 31a is located communicates with the primary insulation space as the other end of the connection insulation wall 26 is spaced apart from the vapor pipe 21, the primary insulation space pipe 31a ) is in smooth communication with the primary insulation space.

In order to stably support the inner end of the primary insulation space pipe 31a, a support block supporting the inner end of the primary insulation space pipe 31a is placed between the second horizontal portion 222a and the connection insulation wall 26. (28) can be provided. This support block 28 is made of a material such as wood, and the inner end of the primary insulation space pipe 31a is not covered, and the schedule of the primary insulation space pipe 31a is maintained inside the second horizontal portion 222a. The primary insulation space pipe 31a is fixed by gripping the fulcrum.

However, inactivation may also be required for a separate space surrounded by the first and second plates 221 and 222, isolated from the primary insulation space, and managed at the same internal pressure as the primary insulation space. To this end, the primary insulation space pipe 31a has a hole 311 formed through the space partitioned by the first and second plates 221 and 222 .

The hole 311 penetrates between the first horizontal portion 221a and the second horizontal portion 222a in the primary insulation space pipe 31a penetrating the first horizontal portion 221a and the second horizontal portion 222a. can be formed Therefore, the space surrounded by the first horizontal portion 221a, the first vertical portion 221b, the second vertical portion 222b, and the second horizontal portion 222a is primarily thermally insulated by the sealing portion 22. It is isolated from the space, but can be communicated with the primary insulation space through the primary insulation space pipe 31a.

The space surrounded by the first and second plates 221 and 222 may be filled with the inner insulator 23. Since the inner insulator 23 may be a porous material like other insulation blocks or insulation walls, the hole 311 Even if provided to cover the first and second plates (221, 222) and the primary insulation space partitioned by the primary insulation space pipe (31a) it is possible to communicate.

However, for smoother communication, the space surrounded by the first horizontal portion 221a, the first and second vertical portions 221b and 222b, and the second horizontal portion 222a has at least one side facing the hole 311 An empty space can be achieved without the construction of this insulation material. Specifically, in the space surrounded by the first and second plates 221 and 222, one side of the hole 311 of the primary insulation space pipe 31a toward the vapor pipe 21 forms an empty space, and the other side is filled with a heat insulating material. It can be, which is the same as shown on the right side of FIG.

The primary insulating space pipe 31a may have an inner end disposed inside the sealing part 22 and an outer end penetrating the sheath part 27 and disposed outside. In addition, the primary insulation space pipe 31a has a spiral structure surrounding the vapor pipe 21 at the portion extending inward and outward between the inner end and the outer end, so as to prepare for contraction and expansion.

Alternatively, the primary insulation space pipe (31a) is applied with bellows at a certain point between the inner end and the outer end, a flexible hose is applied, or a 'c'-shaped bent structure is applied, taking into account contraction and expansion due to temperature change. can achieve

As described above, in this embodiment, while the primary insulation space pipe 31a is disposed in the dome 20, the primary insulation space pipe 31a is formed through the first and second plates 221 and 222 of the sealing part 22. It is possible to form a structure that stably supports the

In addition, in this embodiment, the space isolated by the first and second plates 221 and 222 is communicated with the primary insulation space by using the hole 311 of the pipe 31a of the primary insulation space, It is possible to efficiently manage without omissions for the whole.

In addition, the present invention may also include an additional embodiment in which the second plate 222 is omitted from the sealing portion 22, which is not shown in the drawings. In this case, the third plate 223 may have a third horizontal portion 223a sealedly connected to the secondary barrier 13 and a third vertical portion 223b sealedly connected to the first vertical portion 221b. In addition, the third horizontal portion 223a is located inside and outside the first horizontal portion 221a and is provided in parallel with the first horizontal portion 221a, one end is spaced apart from the vapor pipe 21, and the other end is secondary It can be sealedly connected with the barrier (13).

Also, according to a further embodiment, the third vertical portion 223b overlaps the first vertical portion 221b and is sealed and connected to the first vertical portion 221b by welding or the like. At this time, the rectangular space surrounded by the first horizontal portion 221a, the first vertical portion 221b, the third vertical portion 223b, the third horizontal portion 223a, and the vapor pipe 21 is the third horizontal portion As the 223a is provided not to be sealedly connected to the vapor pipe 21, it may be provided to communicate with the primary insulation space inside the secondary barrier 13. Therefore, in the additional embodiment, since the primary insulation space communicates with the space surrounded by the first horizontal portion 221a, the first and third vertical portions 221b and 223b, and the third horizontal portion 223a, the first and third The space formed by the plates 221 and 223 can also be interpreted as an expanded portion of the primary insulation space.

In a further embodiment, an inner insulator 23 is installed in the space partitioned by the first and third plates 221 and 223, and an outer insulator is installed between the secondary insulation wall 14 and the third vertical portion 223b ( 24) is installed to block heat penetration.

The present invention is not limited to the embodiments described above, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and known technology as another embodiment.

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 H: hull
ID: Inner deck TD: Trunk deck
10: wall 11: primary barrier
12: primary insulation wall 121: connection insulation wall
13: secondary barrier 14: secondary insulation barrier
20: dome 20a: tank dome
20b: vapor dome 21: vapor pipe
22: sealing part 221: first plate
221a: first horizontal portion 221b: first vertical portion
222: second plate 222a: second horizontal portion
222b: second vertical portion 223: third plate
223a: third horizontal portion 223b: third vertical portion
23: inner insulator 24: outer insulator
25: connection barrier 251: first connection barrier
252: second connection barrier 26: connection insulation barrier
27: sheath part 28: support block
30: insulated space passage 31: insulated space pipe
31a: primary insulation space pipe 31b: secondary insulation space pipe
311: Hall 32: Limbu
33: barrier part 34: connection barrier
35: connection insulation wall 36: sheath
361: inner sheath 362: outer sheath
37: outer insulator 38: outer insulator
40: pump tower

Claims (9)

A primary barrier of a metal material forming a storage space for accommodating liquefied gas, a primary insulation wall provided outside the primary barrier, a secondary barrier provided outside the primary insulation wall, and the secondary barrier A wall including a secondary insulation wall provided on the outside and independently forming first and second insulation spaces between the primary barrier and the secondary barrier and outside the secondary barrier, respectively; and
A dome provided on an upper surface of the storage space and passing through the wall to communicate the storage space with the outside,
the dome,
a vapor pipe penetrating the wall and flowing the boil-off gas in the storage space to the outside; and
A sealing portion extending from the outer circumference of the vapor pipe and sealed to the secondary barrier,
the sealing part,
a first plate having a first horizontal portion extending from an outer portion of the wall to the periphery of the vapor pipe and a first vertical portion extending inwardly from the first horizontal portion;
a second plate having a second vertical portion sealedly connected to the first vertical portion and a second horizontal portion provided inside the first horizontal portion and parallel to the first horizontal portion;
a third plate having a third vertical portion sealedly connected to the second vertical portion and a third horizontal portion having one end sealedly connected to the secondary barrier; and
A liquefied gas storage tank comprising a connection barrier connecting the third horizontal portion and the secondary barrier. According to claim 1,
The second horizontal portion extends from the second vertical portion in a direction toward the vapor pipe, and one end thereof is sealed and connected to the vapor pipe,
The third horizontal portion extends from the third vertical portion in a direction away from the vapor pipe, and one end thereof is sealed and connected to the secondary barrier. According to claim 1,
The secondary barrier adjacent to the vapor pipe is provided to expose the secondary insulation wall,
The connection barrier is
a first connection barrier made of metal having one end fixed to a portion of the secondary insulation wall not covered by the secondary barrier and the other end extending beyond the secondary insulation wall and sealedly connected to the third horizontal portion; and
A liquefied gas storage tank comprising a second connection barrier sealingly connecting an inner surface of the first connection barrier to the secondary barrier. According to claim 3,
The first connection barrier has one end bent outward and accommodated inside the secondary insulation wall and fixed by bolting, and the other end is welded to the third horizontal portion,
The second connection barrier has one end fixed to the secondary barrier by bonding and the other end fixed to the inner surface of the first connection barrier by bonding. The method of claim 1, wherein the dome,
an outer heat insulator provided outside the third horizontal portion between the secondary insulation wall and the first to third vertical portions; and
The liquefied gas storage tank further comprises a connection insulation wall provided on the inside of the connection barrier between the primary insulation wall and the vapor pipe, one end of which is spaced apart from the vapor pipe. The method of claim 1, wherein the dome,
Further comprising a heat insulation space pipe communicating the primary heat insulation space with the outside,
The insulated space pipe,
An inner end is provided inside the second horizontal portion through the first horizontal portion and the second horizontal portion, and the dome,
The liquefied gas storage tank further comprises a support block provided between the second horizontal portion and the connection insulation wall and supporting the inner end of the insulation space pipe. The method of claim 6, wherein the heat insulation space pipe,
A liquefied gas storage tank having a hole penetrating the first horizontal portion and the second horizontal portion and penetrating between the first horizontal portion and the second horizontal portion. According to claim 1,
Further comprising a sheath portion surrounding the vapor pipe from the outside of the wall,
The secondary insulation space,
A liquefied gas storage tank communicating with a space surrounded by the sheath, the second vertical portion, the first vertical portion and the first horizontal portion. A vessel having the liquefied gas storage tank according to any one of claims 1 to 8.

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