KR102077912B1 - Liquefied Gas Storage Tank and Marine Structure having the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and an offshore structure having the same, the liquefied gas storage tank of the present invention, the tank shell plate for storing the liquefied gas; A leakage path formed of a moisture-permeable material and leading to a drip tray for leaking liquid leaked from the crack of the tank shell plate; And a heat insulating material formed on the tank shell plate including the leakage path by spraying bubble insulation and blocking heat conduction between the inside and the outside of the tank shell plate.

Description

Liquefied gas storage tank and marine structure having the same

The present invention relates to a liquefied gas storage tank and an offshore structure having the same.

Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane and the like, and has recently been spotlighted as a low pollution energy source in various technical fields.

Natural gas is transported in gaseous form via onshore or offshore gas piping, or transported to distant consumers while being stored in LNG carriers in the form of liquefied liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (below -163 ℃ or less), and its volume is reduced to about 1/600 than natural gas in gas state, so it is very suitable for long distance transportation by sea.

The LNG carrier is provided with a storage tank (also called a cargo hold) for storing and storing liquefied natural gas liquefied by cooling natural gas. Since the boiling point of liquefied natural gas is about -162 ℃ at atmospheric pressure, the storage tank of liquefied natural gas is a material that can withstand ultra low temperatures such as aluminum steel, stainless steel, and 35% nickel steel to store and store liquefied natural gas safely. It can be manufactured and designed to be resistant to thermal stress and heat shrinkage and to prevent thermal intrusion.

LNG carriers for loading and unloading LNG to land demand by loading sea, LNG ReVification Vessel (RV), which reloads LNG after recharging stored LNG after arriving at land demand by loading sea, recently unloading LNG This includes liquefied gas storage tanks installed on LNG carriers or LNG RVs, even in offshore floating installations such as LNG Floating, Production, Storage and Offloading (FPFP) or LNG Floating Storage and Regasification Units (FSRUs).

As described above, liquefied gas storage tanks for storing LNG in cryogenic conditions are installed in offshore structures such as LNG carriers, LNG RVs, LNG FPSOs, and LNG FSRUs that transport or store liquid cargo such as LNG.

These liquefied gas storage tanks can be classified into independent type and membrane type according to whether the load of the cargo directly acts on the insulation.

The stand-alone type is a type in which the storage tank is not formed integrally with the hull and the independent storage tank is supported by the hull support device.It is divided into Type A, B, and C according to the installation number and pressure of the barrier to prevent liquefied gas leakage. do. Type A is the installation of both primary and secondary barriers, which corresponds to AKER's Aluminum Double Barrier Tank (ADBT). Type B is a structure to prepare for the leakage of primary barrier by installing a primary barrier and a drip tray. The storage tank has a spherical MOSS type and a SPB type of IHI, which is a prismatic type. have. Type C is a pressure vessel with a primary barrier.

Membrane types are classified into GTT Mark-III type and GTT NO 96 type in such a way that the storage tank is formed integrally with the hull.

Among the standalone liquefied gas storage tanks, Type B storage tanks are used as tank shell plates as primary barriers made of alloys resistant to low temperatures, such as aluminum alloys, stainless steels, and Ni-9% steels. It may include a heat insulating portion consisting of a plurality of heat insulating panels attached in an assembly manner, and a leak liquid drainage facility for collecting the liquefied gas leaking from the tank shell plate.

The leakage drainage system is disposed between the leakage path formed by the gap between the tank shell plate and the heat insulation portion, the drip tray as a partial secondary barrier and a drip tray disposed between the inner plate and the heat insulation portion of the hull. It may include a drain for draining the flowing leak liquid to the drip tray.

However, the existing Type B storage tank has to design and manufacture a plurality of insulation panels in consideration of the shape of the tank shell plate in order to form a heat insulating part, and a plurality of manufactured insulation panels must be installed on the tank shell plate in an assembling manner. There is a problem that excessive workmanship and construction stages occur from the design stage to the installation stage, such as the construction of the leakage path in consideration of the panel assembly.

The present invention has been created to solve the problems of the prior art as described above, the object of the present invention, the liquefied gas storage tank and the marine gas having the same to reduce the labor and construction cost of the leakage liquid drainage and heat insulation To provide a structure.

Liquefied gas storage tank according to an aspect of the present invention, the tank shell plate for storing the liquefied gas; A leakage path formed of a moisture-permeable material and leading to a drip tray for leaking liquid leaked from the crack of the tank shell plate; And a heat insulating material formed on the tank shell plate including the leakage path by spraying bubble insulation and blocking heat conduction between the inside and the outside of the tank shell plate.

Specifically, the leakage path may be formed in the form of a band using a moisture-permeable material, and attached to the cracked portion of the tank shell plate.

Specifically, the leakage path, the cross section may be formed in any one of a rectangular, semi-circular, semi-elliptic type.

Specifically, the leakage path, a void space may be formed in a portion of the cross section.

Liquefied gas storage tank according to another aspect of the present invention, the tank shell plate for storing the liquefied gas; A leakage path composed of a first leakage path formed of a moisture-permeable material and a second leakage path formed of a gap, the leakage path leading to leakage of the tank shell plate by a crack to the drip tray; And a first insulation portion formed by spraying bubble insulation on the tank shell plate including the first leakage path, and an insulation panel formed on the tank shell plate with the second leakage path therebetween. Consists of two insulation, characterized in that it comprises a heat insulation to block the heat conduction between the inside and outside of the tank shell plate.

In detail, the first leakage path and the first insulation part may be formed at the side and the upper portion of the tank shell plate, and the second leakage path and the second insulation part may be formed at the lower part of the tank shell plate. .

Specifically, the first leakage path is formed in the form of a band using a moisture-permeable material, and is formed by attaching to a cracked portion of the tank shell plate, the second leakage path to be connected to the second leakage path at the end A connection part extending to an area where the heat insulation part is formed may be further provided.

Specifically, the connecting portion, but lowering the height than the gap forming the second leakage path, the width is wider to form a multi-faceted area equivalent to the first leakage path is relatively high, the first leakage path and the The bottleneck of the leaking liquid can be prevented at the connection part of the second leakage path.

Marine structure according to another aspect of the present invention, characterized in that it comprises a liquefied gas storage tank described above.

The liquefied gas storage tank according to the present invention and the offshore structure having the same are formed by attaching a band made of a soft porous moisture-permeable material to the surface of the tank shell plate in the leak drainage facility, thereby eliminating the need for difficult processing. In addition, the tank shell plate can be freely and flexibly installed on any surface such as flat surface or curved surface, thereby reducing the labor and construction cost of the leak drainage facility.

In addition, the liquefied gas storage tank and the offshore structure having the same according to the present invention, by applying the insulation to the tank shell plate with a foam foam insulation (Spray Foam Insulation) to form a thermal insulation coating layer, there is no need for a difficult assembly process, tank shell Since the plate can be freely and flexibly installed in any shape such as flat or curved surface, it is possible to reduce the labor and construction cost of the insulation part.

In addition, the liquefied gas storage tank and offshore structure provided with the same according to the present invention, when the lower portion forms a horizontal plane, such as the SPB-type liquefied gas storage tank of the prismatic (Prismatic Type), the sides and the upper portion is soft The first leakage path and the first insulation portion are formed by a band made of a porous moisture-permeable material and an insulation coating layer coated with a bubble insulation material, and the lower part has a second leakage path and a second insulation portion formed by a gap and an insulation panel. The upper part can reduce the labor and construction cost of the first leakage path and the first heat insulating part, the lower part can be easily guided to the drip tray.

1 is a configuration diagram of a liquefied gas storage tank and a marine structure having the same according to the first embodiment of the present invention.
2 is a view for explaining a liquefied gas storage tank according to a first embodiment of the present invention.
3A to 3D are views for explaining the construction of the leakage path and the heat insulating part of FIG.
4 (a) to 4 (c) are diagrams for explaining various cross-sectional shapes of the leakage path.
5A to 5B are views for explaining the construction of a leak path having a void space at an intersection portion.
6 is a configuration diagram of a liquefied gas storage tank and a marine structure having the same according to the second embodiment of the present invention.
7 is a view for explaining a liquefied gas storage tank according to a second embodiment of the present invention.
8A to 8D are views for explaining the construction of the first and second leakage paths and the first and second insulation parts of FIG. 7.
9 (a) to 9 (b) are diagrams for explaining the flow of leakage liquid from the first leakage path to the second leakage path at the boundary between the first insulation area and the second insulation area.
10 (a) to 10 (b) are views for explaining various connection part shapes of the first leakage path connected to the second leakage path at the boundary between the first insulation area and the second insulation area.

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

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

For reference, the marine structure 1 described below may include a hull 10 having a double hull of an inner hull 11 and an outer hull 12, and a certain point of the sea. It is important to note that the concept encompasses ships that transport cargo from origin to destination in addition to offshore structures that are floating on and perform specific tasks. For example, the offshore structure 1 may be an LNG carrier, an LNG RV, an LNG FPSO, an LNG FSRU for transporting or storing a liquid cargo such as LNG.

In addition, liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, ethane, liquid nitrogen, and the like. However, liquefied gas may mean not only liquid liquefied gas but also vaporized liquefied gas.

1 is a configuration diagram of a liquefied gas storage tank and a marine structure having the same according to the first embodiment of the present invention, Figure 2 is a view for explaining a liquefied gas storage tank according to a first embodiment of the present invention, 3A to 3D are views for explaining the construction of the leakage path and the heat insulating part of FIG. 2, and FIGS. 4A to 4C are views for explaining various cross-sectional shapes of the leakage path. 5A to 5B are views for explaining the construction of a leakage path having a void space at an intersection portion.

1 to 5, the liquefied gas storage tank 100 according to the first embodiment of the present invention can store the liquefied gas, can be provided in the hull 10 of the offshore structure (1) have.

The liquefied gas storage tank 100 according to the present invention is located inside the inner plate 11 of the hull 10, and as an independent type (tank) storage tank, the storage tank is a spherical MOSS type liquefied gas storage tank Or it may be a square SPB type liquefied gas storage tank.

The liquefied gas storage tank 100 may be configured to include a tank shell plate 110, the heat insulating part 120, the leakage liquid drainage facility 130, hereinafter is a case of the MOSS type as shown in FIG. It demonstrates as an example.

The tank shell plate 110 is a part constituting a spherical sealed container to maintain the airtightness of the liquefied gas storage tank 100, so that the liquefied gas is sealed and stored inside the tank shell plate 110. An internal space is formed.

The tank shell plate 110 may be made of a heat resistant material so as to keep the cryogenic liquefied gas as a primary barrier, and may be made of a metal material such as aluminum alloy, stainless steel, or Ni-9% steel. .

The heat insulating part 120 may be installed on the outer surface of the tank shell plate 110 to block heat conduction between the inside and the outside of the tank shell plate 110.

The heat insulating part 120 may be formed of a heat insulating coating layer applied by spraying a foam foam insulation (Spray Foam Insulation), such as polyurethane foam to the tank shell plate 110, as described above It is possible to form by the spraying method, not the assembly method of the leakage path 131 of the leakage drainage facility to be described later is possible by forming a band made of a porous moisture-permeable material.

Thus, the present embodiment is formed by applying a spraying method, unlike the existing method of manufacturing a plurality of insulating panels 120 and install them in an assembly method, there is no need for the existing difficult assembly process, the tank shell plate 110 The construction can be freely and flexibly in any form, such as flat, curved surface, it is possible to reduce the labor and construction cost of the heat insulating part 120.

Leakage drainage system 130 is to collect the liquefied gas leaking due to the crack in the tank shell plate 110, it may be configured to include a leakage path 131, the drip tray 132, the drain 133. .

The leakage path 131 may be formed between the tank shell plate 110 and the heat insulating part 120. The leaked liquefied gas may be drained by inducing the leaked liquefied gas to the drip tray 132 to be described later through the drain 133. It can be configured to be.

The leakage path 131 is formed in the form of a band using a moisture-permeable material such as a soft porous polyurethane foam, and is attached to the surface of the cracked portion of the tank shell plate 110, for example, a tank shell plate The tank shell plate by the adhesive member along the weld line or the back side of the weld line of the weld zone where the possibility of cracking increases due to welding installation of a stiffener 140 inside the tank shell plate 110 to reinforce the 110. It may be attached to the outer surface of the (110).

As such, the leakage path 131 may be formed of a moisture-permeable material such as a soft porous polyurethane foam, and the like may be formed by the spraying method using the thermal insulation material formed by the insulating part 120 formed on the upper part in a subsequent process. This is possible because it does not occur.

As shown in (a) of FIG. 4, the leakage path 131 may have a rectangular cross section, and may be formed in any shape that covers a portion of the weld where there is a possibility of cracking, such as a semicircle or a semi-ellipse. Of course.

In addition, the leakage path 131 may form a void space (VS) in a portion of the cross-section for smoother drainage of the leakage liquid, as shown in FIGS. 4B to 4C.

As shown in FIGS. 4B to 4C, when the void space VS is formed in the cross section of the leakage path 131, as shown in FIGS. 5A to 5B, the intersection ( Intersection) portion can be configured to allow the liquefied gas to pass through the moisture-permeable nature of the leakage path 131 without processing for the passage of the void space (VS) that crosses separately for construction convenience and material processing cost reduction to be. At this time, the leakage path 131 composed of the void space (VS) excluding the intersection part may be formed of a hard waterproof / moisture-proof material such as expanded polystyrene (EPS) as well as a soft porous moisture-permeable material.

In this embodiment, the leakage path 131 is formed by attaching a band made of a soft porous moisture-permeable material to the surface of the tank shell plate 110 so that the leaked liquefied gas may be described below by gravity. It can be easily guided to the tray 132, the tank shell plate can be freely and flexibly installed in any shape, such as flat, curved surface, it is possible to reduce the labor and construction cost of the leak drainage facility.

The drip tray 132 is a device that receives the liquefied gas leaking from the tank shell plate 110 and collects it into one place when a leak occurs in the tank shell plate 110, and insulates the inner plate 11 of the hull 10. It may be installed under the drain 133 to be described later between the parts 120, and may serve as a partial secondary barrier (Partial Secondary Barrier).

The drain 133 may be formed in the heat insulating part 120 so as to communicate with the leak path 131 to drain the leak liquid flowing through the leak path 131 to the drip tray 132.

The liquefied gas storage tank 100 according to the first embodiment of the present invention includes a heat insulating part 120 and a tank shell plate 110 formed of a heat insulating coating layer of foam insulation on the entire outer surface of the tank shell plate 110. ), And a standalone liquefied gas storage tank including a leakage path 131 made of a band of moisture-permeable material between the heat insulating portion 120 and, as well as the square MOSS liquefied gas storage tank, as well as the rectangular SPB liquefied gas storage tank Of course you can. However, since the leakage path 131 is made of a moisture-permeable material, the flow of the leaked liquid is greatly influenced by gravity, so that the liquefied gas storage tank 100 according to the first embodiment of the present invention has a square SPB having a lower surface in a horizontal plane. It may be more suitable for older MOSS liquefied gas storage tanks than for liquefied gas storage tanks.

6 is a configuration diagram of a liquefied gas storage tank and a marine structure having the same according to a second embodiment of the present invention, Figure 7 is a view for explaining a liquefied gas storage tank according to a second embodiment of the present invention, 8A to 8D are views for explaining the construction of the first and second leakage paths and the first and second insulation parts of FIG. 7, and FIGS. 9A to 9B illustrate the first insulation. 10A and 10B are views for explaining the flow of the leaking liquid from the first leakage path to the second leakage path at the boundary between the subregion and the second insulation section, and FIGS. FIG. 3 is a view for explaining various connection part shapes of the first leakage path connected to the second leakage path at the boundary portion of the second insulation part area.

6 to 10, the liquefied gas storage tank 200 according to the second embodiment of the present invention can store the liquefied gas, can be provided in the hull 10 of the offshore structure (1) have.

The liquefied gas storage tank 200 according to the present invention is located inside the inner plate 11 of the hull 10, and as an independent type (tank) storage tank, SPB-type liquefied gas storage tank in which the shape of the storage tank is square. Or it may be a spherical MOSS type liquefied gas storage tank.

The liquefied gas storage tank 200 may be configured to include a tank shell plate 210, the heat insulating portion 220, the leakage liquid drainage facility 230, in the following case the SPBS type as shown in FIG. It demonstrates as an example.

The tank shell plate 210 is a part constituting a sealed container of a rectangular shape to maintain the airtightness of the liquefied gas storage tank 200, so that the liquefied gas is sealed and stored inside the tank shell plate 210. An internal space is formed.

The tank shell plate 210 may be made of a heat-resistant material so as to keep the cryogenic liquefied gas as a primary barrier and be made of a metal material such as aluminum alloy, stainless steel, or Ni-9% steel. .

The heat insulating part 220 may be installed on the outer surface of the tank shell plate 210 to block heat conduction between the inside and the outside of the tank shell plate 210, and the first heat insulating part 221 and the second heat insulating part 222. It can be composed of). The first insulation portion 221 may be formed on the side and top of the tank shell plate 210 of the square, the second insulation portion 222 may be formed below the tank shell plate 210 of the square.

The first insulation portion 221 may be formed of an insulating coating layer applied by spraying a foam insulation (Spray Foam Insulation) such as polyurethane foam on the side and top of the tank shell plate 210, As can be formed by the spraying method, rather than the assembly method of the existing heat insulating panel is possible by forming the first leakage path 231a of the leakage liquid drainage facility 230 to be described later as a band made of a porous moisture-permeable material.

Thus, the present embodiment is formed by applying the spraying method, unlike the existing method of manufacturing the first heat insulating part 221 and installing a plurality of heat insulation panels and installing them in an assembly method, without the need for the existing difficult assembly process, the tank shell plate ( 210 can be freely and flexibly constructed in any form, such as flat, curved surface, it is possible to reduce the labor and construction cost of the heat insulating part 220.

The second heat insulating part 222 may be formed by manufacturing a heat insulating panel made of a material such as polyurethane foam and installing the lower portion of the tank shell plate 210 by an assembling process. When the second insulation portion 222 is formed of the insulation panel, the insulation panel is tanked so that the second leakage path 231b to be described later is formed between the tank shell plate 210 and the second insulation portion 222. The gap Gap may be formed therebetween without being completely in contact with the shell plate 210.

The first insulation portion 221 and the second insulation portion 222 may be connected at a boundary portion BP between the first insulation portion region 221a and the second insulation portion region 222a.

Leakage drainage facility 230 is to collect the liquefied gas leaking due to the crack in the tank shell plate 210, it may be configured to include a leakage path 231, the drip tray 232, the drain 233. .

The leakage path 231 may be formed between the tank shell plate 210 and the heat insulator 220, and the leaked liquefied gas may be drained to the drip tray 232 to be described later through the drain 233 to be described later. It can be configured to be. The leakage path 231 may include a first leakage path 231a and a second leakage path 231b. The first leakage path 231a may be formed at the side and the top of the tank shell plate 210, which is the region 221a where the first insulation part 221 is formed, and the second leakage path 231a is the second insulation. It may be formed in the lower portion of the tank shell plate 210 which is a region 222a in which the portion 222 is formed.

The first leakage path 231a is formed in the form of a band using a moisture-permeable material such as a soft porous polyurethane foam, and is formed by attaching to the surface of the portion of the tank shell plate 210 that may be cracked. For example, by welding the stiffener 240 to the inner side of the tank shell plate 210 to reinforce the tank shell plate 210 by the adhesive member along the weld line or the back of the weld line of the weld zone (Weld Zone) where the possibility of cracking increases. It may be attached to the outer surface of the tank shell plate 210 to be formed.

As such, the first leakage path 231a may be formed of a moisture-permeable material such as a soft porous polyurethane foam, and the like, and the first insulation portion 221 formed on the upper portion of the first leakage path 231a is formed by a spraying method using bubble insulation. This is possible because the pressing phenomenon does not occur.

Like the leakage path 131 of the first embodiment described above, the first leakage path 231a has a cross section at the side and top of the tank shell plate 210 which is an area 221a in which the first insulation part 221 is formed. The rectangular, semi-circular, semi-elliptic and the like can be formed in any shape to cover cracked areas, and a void space VS can be formed in a part of the cross section.

The second leakage path 231b may be formed of a gap formed by being spaced apart from the tank shell plate 210 at a predetermined interval during the heat insulating panel assembly process for forming the second insulation portion 222.

The first leakage path 231a and the second leakage path 231b may be connected at a boundary portion BP between the first insulation portion region 221a and the second insulation portion region 222a.

The first leakage path 231a is connected to the second leakage path 231b at the end portion CP so that the leakage of the first leakage path 231a can be easily guided to the second leakage path 231b. May be further provided.

The connection portion CP of the first leakage path 231a overlaps the second leakage path 231b that extends to the second insulation portion region 222a to which the heat insulation panel of the second insulation portion 222 is attached. The tank shell plate 210 and the second heat insulating part are squeezed by the heat insulating panel constituting the second heat insulating part 222 so as not to lose their function as a leakage path. The height of the first leakage path is formed in the first insulation region 221a so as to lower the height in consideration of the gap therebetween, so that the flow of the leaked liquefied gas does not cause a bottleneck. 231a) may have a wide width so as to have an equivalent cross-sectional area.

As shown in FIG. 9A, the connection part CP of the first leakage path 231a may simply form two paths having different cross-sectional shapes to abut each other, and may be illustrated in FIG. 9B. As described above, the two paths having different cross-sectional shapes may be processed to form smoothly.

The drip tray 232 is a device that receives the liquefied gas leaking from the tank shell plate 210 and collects it in one place when a leak occurs in the tank shell plate 210. It may be installed under the drain 233 to be described later between the second insulation portion 222, may serve as a partial secondary barrier (Partial Secondary Barrier).

The drain 233 is formed in the second insulation portion 222 so as to communicate with the second leakage path 231b and drips the leaking liquid flowing through the leakage path 231 including the first and second leakage paths 231a and 231b. Can drain to the tray 232

The liquefied gas storage tank 200 according to the second embodiment of the present invention includes a first heat insulating part 221 formed of a heat insulating coating layer of bubble insulating material on the side and top surfaces of the tank shell plate 210 and the tank shell. A first leakage path 231a formed of a band of a moisture-permeable material is formed between the plate 210 and the first insulation portion 221, and a second insulation portion made of an insulation panel on the lower surface of the tank shell plate 210. 222 and a second liquefied gas storage tank formed with a gap between the tank shell plate 210 and the second insulation portion 221 is formed as a gap, the lower portion is a horizontal plane drip tray drip tray It may be suitable for the SPB type liquefied gas storage tank of the square type that is not easy to guide to (232), it is of course applicable to the spherical MOSS type liquefied gas storage tank.

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

Thus, the present embodiment is formed by attaching a band made of a soft porous moisture permeable material to the surface of the tank shell plate (110, 210) of the leakage paths (131, 231a) of the leak liquid drainage equipment (130, 230) No need for complicated processing, the tank shell plates 110 and 210 can be freely and flexibly installed on any surface such as flat surface or curved surface, thereby reducing the labor and construction cost of the leak drainage facility 130 or 230. can do.

In addition, the present embodiment, by applying the heat insulating portion (120, 221) to the tank shell plate (110, 210) by foam insulation (Spray Foam Insulation) to form a heat insulating coating layer, there is no need for a difficult assembly process, tank shell Plates 110 and 210 can be freely and flexibly constructed in any form, such as flat or curved surface, it is possible to reduce the labor and construction cost of the thermal insulation (120, 221).

In addition, the present embodiment, when the lower portion forms a horizontal plane, such as the SPB type liquefied gas storage tank of the prismatic type (Prismatic Type), the side and the upper portion is made of a flexible porous moisture-permeable material and the band and bubble insulation The first leakage path 231a and the first insulation portion 221 are formed by the coated insulation coating layer, and the second leakage path 231b and the second insulation portion 222 are formed by the gap and the insulation panel. , The side and the top can reduce the labor and construction cost of the first leakage path (231a) and the first insulating portion 221, the lower portion can be easily guided to the drip tray 232.

The present invention has been described above with reference to the embodiments of the present invention. However, the present invention is only an example, and is not intended to limit the present invention. Those skilled in the art will not depart from the essential technical details of the present embodiment. It will be appreciated that various combinations or modifications and applications that are not exemplified in the embodiments are possible in scope. Therefore, technical matters related to modifications and applications that can be easily derived from the embodiments of the present invention should be interpreted as being included in the present invention.

1: offshore structure 10: hull
11: inner plate 12: outer plate
100, 200: liquefied gas storage tank 110, 210: tank shell plate
120, 220: heat insulating portion 221: first heat insulating portion
221a: first insulation portion region 222: second insulation portion
222a: second insulation area 130, 230: leaking liquid drainage
131, 231: leakage path 231a: first leakage path
231b: second leakage path 132, 232: drip tray
133, 233: drain hole 140, 240: stiffener
VS: void space CP: connection
BP: boundary

Claims (9)

A tank shell plate for storing liquefied gas;
A leaking path formed of a porous moisture-permeable material that absorbs the leaking liquid to generate a flow by gravity, and introduces the leaking liquid leaked by the crack of the tank shell plate into the drip tray; And
It is formed by spraying the bubble insulation material on the tank shell plate including the leakage path so that the leakage path formed of a porous moisture-permeable material, and comprises a heat insulation to block the heat conduction between the inside and the outside of the tank shell plate. Liquefied gas storage tanks. The method of claim 1, wherein the leakage path,
A liquefied gas storage tank, wherein the liquefied gas storage tank is formed using a moisture-permeable material and formed by attaching to a cracked portion of the tank shell plate. The method of claim 1, wherein the leakage path,
Liquefied gas storage tank, characterized in that the cross section is formed in any one of the shape of a rectangle, semi-circle, semi-elliptic. The method of claim 3, wherein the leakage path,
Liquefied gas storage tank, characterized in that the void space is formed in a portion of the cross section. A tank shell plate for storing liquefied gas;
It consists of a first leakage path formed of a porous moisture-permeable material that absorbs the leaking liquid to generate a flow by gravity, and a second leakage path connected to the first leakage path and formed in a gap, and cracks in the tank shell plate. Leakage path leading to the leaking liquid to the drip tray; And
The first insulation portion formed by spraying the bubble insulation material on the tank shell plate including the first leakage path so that the first leakage path formed of the porous moisture-permeable material is not pressed, and the second leakage path is interposed therebetween. Liquefied gas storage tank comprising a second heat insulating portion formed by the assembly of the heat insulating panel on the tank shell plate, the heat insulating portion to block the heat conduction between the inside and outside of the tank shell plate. The method of claim 5,
The first leakage path and the first insulation portion is formed on the side and the top of the tank shell plate,
The second leakage path and the second insulating portion, the liquefied gas storage tank, characterized in that formed in the lower portion of the tank shell plate. The method of claim 5, wherein the first leakage path,
It is formed in the form of a band using a moisture-permeable material, and is formed by attaching to a cracking part of the tank shell plate,
Liquefied gas storage tank, characterized in that the connecting portion extending to the area in which the second insulation is formed to be connected to the second leakage path at the end. The method of claim 7, wherein the connection portion,
The height is lower than the gap forming the second leakage path, and the width is widened to form a multi-face area equivalent to the first leakage path having a relatively high height, and thus, a connection portion between the first leakage path and the second leakage path. Liquefied gas storage tank, characterized in that to prevent the bottleneck of leakage liquid in the. A marine structure, characterized in that the liquefied gas storage tank according to any one of claims 1 to 8 is provided.

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