KR101302211B1 - Liquefied gas storage tank and Ship including the same - Google Patents

Abstract

A liquefied gas storage tank and a vessel comprising the same are presented. Liquefied gas storage tank according to an embodiment of the present invention, the barrier to form an inner space to store the liquefied gas; A plurality of heat insulation panels installed outside the barrier; A connection member disposed between the heat insulation panel and the barrier so that a gap is maintained between the heat insulation panel and the barrier; And installed on the outside of the insulation panel, may include a leaking liquid collection device for collecting the liquefied gas leaking liquid leaked from the barrier. Here, the plurality of insulation panels may be installed so that a step is formed between adjacent insulation panels.

Description

Liquefied gas storage tank and ship including the same}

The present invention relates to a liquefied gas storage tank and a ship including the same, and more particularly, to a liquefied gas storage tank for guiding and collecting the liquefied gas leakage liquid leaked from the liquefied gas storage tank and a vessel comprising the same.

Liquefied gas carriers are used to transport liquefied gases, such as liquefied natural gas (Liquefied Natural Gas) or liquefied petroleum gas (LPG), to consumers.

Liquefied gas carriers are divided into independent tank type and membrane type according to the type of storage tank. Here, the independent tank type is a method in which the storage tank is not formed integrally with the hull and the independent storage tank is supported by the hull supporting device, and according to the installation number and the use pressure of the barrier preventing the leakage of liquefied gas, Type A, B , Separated by C. 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 the primary barrier by installing the primary barrier and installing the leak liquid collecting device. SPH (Self) of IHI Co., Ltd., which is a moss type with a tank shape and a prismatic type -supporting, Prismatic-shape IMO type B). 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.

In particular, the independent tank type can be installed on the ship separately from the ship and can be installed on the ship, and has a relatively strong point than the membrane type in terms of structural safety, and the insulation system is exposed to the outside of the tank for easy repair and management. .

However, in the case of a conventional independent tank type storage tank, when the liquefied gas leaks, the path of the leaked liquid is changed by the movement of the ship, so the liquefied gas leaked liquid cannot be collected quickly and the leak detection is delayed.

Embodiment of the present invention is to provide a liquefied gas storage tank and a ship including the same that can be discharged more quickly liquefied gas leak.

According to an aspect of the invention, the barrier to form an inner space to store the liquefied gas; A plurality of heat insulation panels installed outside the barrier; A connection member disposed between the heat insulation panel and the barrier so that a gap is maintained between the heat insulation panel and the barrier; And installed on the outside of the insulation panel, there is provided a liquefied gas storage tank including a leaking liquid collecting device for collecting the liquefied gas leaking liquid leaked from the barrier. Here, the plurality of heat insulation panels are installed such that a step is formed between adjacent heat insulation panels.

The leak liquid collecting device may include a drip tray.

Among the plurality of heat insulation panels, a heat insulation panel provided outside the side part of the barrier is a direction toward the virtual vertical center line or vertical to the virtual vertical line when viewed from an imaginary vertical center line that crosses the side portion of the barrier in the vertical direction. It may be installed to be inclined away from the center line.

Among the plurality of heat insulation panels, the heat insulation panel installed outside the side wall of the barrier may be installed to be inclined toward any one of edges of the side wall of the barrier.

Among the plurality of heat insulation panels, the heat insulation panel installed outside the bottom portion of the barrier, in the direction toward the imaginary horizontal center line across the bottom portion of the barrier, or in the imaginary horizontal center line It may be installed inclined in the direction away.

Among the plurality of heat insulation panels, the heat insulation panel installed outside the bottom portion of the barrier may be installed to be inclined toward any one of the edges of the bottom portion of the barrier.

Each of the thermal insulation panel installed outside the side portion of the barrier and the thermal insulation panel provided outside the bottom portion of the barrier may be connected to be sealed to each other at an edge outer region of the barrier.

Between the barrier and the insulation panel provided on the outer side of the side wall of the barrier may be provided with a gap screen in the transverse direction, the insulating panel adjacent to the gap screen to discharge the liquefied gas leakage liquid collected from the gap screen A drain hole may be formed, and the leak liquid collecting device may be installed outside the insulation panel to be adjacent to the first drain hole.

The gap screen may be installed to be inclined downward toward the first drain.

A second drainage port may be formed in the insulation panel installed outside the bottom of the barrier so that the liquefied gas leaking liquid collected from the gap is discharged, and the leaking liquid collecting device may be installed below the second drainage hole.

According to another aspect of the present invention, there is provided a hull comprising: a hull; There is provided a vessel including a liquefied gas storage tank according to an aspect of the present invention installed in the hull.

According to an embodiment of the present invention, when the liquefied gas leaked from the barrier flows down the inclination of the insulation panel by tilting so that a step is formed in the plurality of insulation panels to collect the liquefied gas leakage liquid more quickly where desired. Can be.

In addition, it is possible to discharge the leaked liquefied gas more quickly and effectively by shortening the path of the liquefied gas leaking liquid.

1 is a cross-sectional view of a vessel including a liquefied gas storage tank according to an embodiment of the present invention.
2 is a perspective view showing a liquefied gas storage tank according to an embodiment of the present invention.
3 is an enlarged partial view of a portion of FIG. 1 enlarged.
4 is an enlarged partial view of a portion b of FIG. 1 enlarged.
5 is a cross-sectional view of the liquefied gas storage tank according to an embodiment of the present invention with reference to the arrow A in FIG.
6 is a view showing a modification of the liquefied gas storage tank according to an embodiment of the present invention shown in FIG.
7 is a cross-sectional view of the liquefied gas storage tank according to an embodiment of the present invention based on the arrow B direction of FIG.
8 is a view showing a modification of the liquefied gas storage tank according to an embodiment of the present invention shown in FIG.
Figure 9 is a side view of the liquefied gas storage tank according to an embodiment of the present invention based on the arrow B direction of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, a liquefied gas storage tank and a vessel including the same according to the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and Duplicate explanations will be omitted.

1 is a view schematically showing a cross section of a vessel 1000 including a liquefied gas storage tank according to an embodiment of the present invention, Figure 2 is a liquefied gas storage tank 100 according to an embodiment of the present invention It is a perspective view shown.

Referring to FIG. 1, a vessel 1000 having a liquefied gas storage tank according to the present embodiment is a vessel provided with a liquefied gas storage tank 100 extending in the longitudinal direction of the hull 1 and the hull 1 ), The barrier 110, the insulation panel 120, the connection member 130, may be configured to include a leaking liquid collecting device (140).

The vessel in the present invention may include a floating offshore structure having a liquefied gas storage tank, such as LNG-FPSO (Floating Production Storage Offloading) as well as a conventional vessel that can be propelled with self-defense capability.

The hull 1 may be composed of a double hull of an outer hull and an inner hull, and a liquefied gas storage tank 100 for storing liquefied gas in the inner hull of the hull 1. ) Will be located.

1 and 2, the liquefied gas storage tank 100 according to the present embodiment is an independent type storage tank (barrier 110, heat insulation panel 120, connecting member 130, leakage) It is configured to include a liquid collecting device 140, may be dried together with the hull (1), may be manufactured separately from the hull (1) and mounted in the hull (1).

According to the present embodiment, a plurality of heat insulation panels 120 are installed such that a step is formed on each side of the liquefied gas storage tank 100, more specifically, on the outer side of the side wall and the bottom of the barrier 110. By giving a step to each of the 120, the liquefied gas leaked from the barrier 110 can be discharged more quickly to the leak liquid collecting device 140 through the gap (3) between the barrier 110 and the insulation panel 120. have.

Here, the side portion may include any one or more of four sides of the liquefied gas storage tank 100 in the four directions except for the top and bottom.

Hereinafter, each configuration of the liquefied gas storage tank 100 according to the present embodiment will be described in more detail with reference to FIGS. 1 to 8.

3 is a partially enlarged view of an enlarged portion a of FIG. 1, and FIG. 4 is a partially enlarged view of an enlarged portion b of FIG. 1.

5 is a cross-sectional view of the liquefied gas storage tank 100 according to the present embodiment based on the arrow A in FIG. 2, and FIG. 6 is a liquefied gas storage tank 100 according to the present embodiment shown in FIG. 5. It is a figure which shows the modification of.

7 is a cross-sectional view of the liquefied gas storage tank 100 according to the present embodiment based on the arrow B in FIG. 2, and FIG. 8 is a liquefied gas storage tank 100 according to the present embodiment shown in FIG. 7. It is a figure which shows the modification of.

9 is a side view of the liquefied gas storage tank 100 according to the present embodiment with reference to the arrow B in FIG. 2.

First, the barrier 110 is a part constituting a sealed container for maintaining the airtightness of the liquefied gas storage tank 100, the inner space 112 so that the liquefied gas is sealed and stored inside the barrier 110. ) Is formed.

Barrier 110 may be made of a heat-resistant material so that the cryogenic liquefied gas can be hermetically stored, for example, may be made of a metal material such as aluminum alloy, stainless steel, Ni-9% steel.

As shown in FIG. 1, the barrier 110 may be supported by a support 170 interposed between the hull inner surface 2 and the barrier 110.

That is, the barrier 110 is connected to the hull 1 by the support 170, and the liquefied gas is filled in the inner space 112 of the barrier 110. In this case, the load of the liquefied gas contained in the liquefied gas storage tank 100 and the internal space 112 acts on the support 170. At this time, the support 170 may be configured to include a heat insulating material so that the cooling heat of the liquefied gas is not transferred to the hull 1 through the support 170.

As illustrated in FIGS. 1 and 2, a plurality of insulation panels 120 are installed outside the barrier 110 to block heat conduction between the inside and the outside of the barrier 110.

The insulation panel 120 may be made of a material such as polyurethane foam. The insulation panel 120 may be formed of a plurality of prefabricated insulation panels 120 attached to the surface of the barrier 110, for example. In this case, the plurality of insulation panels 120 may be interconnected by a cushion joint (not shown), and may be attached to the barrier 110 surface by a fastening member such as a stud.

In the present embodiment, the plurality of insulation panels 120 is installed on the outer side of the barrier 110, wherein the plurality of insulation panels 120 are formed so that a step is formed between the insulation panels 120 adjacent to each other. The outer surface of the barrier 110, more specifically, may be installed on the outer side of the side wall and the bottom of the barrier 110, respectively.

Specifically, the insulation panel 120 installed outside the side wall of the barrier 110 has a virtual vertical center line (YY line in FIG. 2) crossing the side surface of the barrier 110 in the vertical direction. It may be inclined in a direction toward (YY line) or away from the virtual vertical center line (YY line).

More specifically, the heat insulation panel 120 installed outside the side portion of the barrier 110 may be inclined so as to protrude outward toward the virtual vertical center line (YY line), as shown in FIG. As shown in FIG. 6, it may be inclined so as to protrude outward toward a direction away from the imaginary vertical center line (YY line) (that is, a side edge portion of the barrier 110).

That is, the heat insulation panel 120 is installed so that the step is formed on the outer side of the side wall of the barrier 110, as shown in Figure 5 toward the imaginary vertical center line (YY line) side edge portion of the side wall of the barrier 110. It may be installed to protrude outward, as shown in Figure 6 may be installed to protrude outward toward the side edge portion of the barrier 110 in the virtual vertical center line (YY line) side.

In addition to the above-described examples, the insulation panel 120 installed outside the side wall of the barrier 110 may be installed to be inclined toward any one of the edges of the side wall of the barrier 110.

That is, the inclination (that is, the step) formed by the insulation panel 120 provided outside the side part of the barrier 110 may include all of the inclinations from one side edge portion of the side wall of the barrier 110 toward the opposite edge portion thereof. Can be.

In addition, the insulation panel 120 installed outside the bottom of the barrier 110 has a virtual horizontal center line (XX line in FIG. 2) that crosses the bottom portion of the barrier 110. It may be installed to be inclined in a direction toward or away from the virtual horizontal center line (XX line).

More specifically, the heat insulation panel 120 installed outside the bottom portion of the barrier 110 may protrude outward (ie, downward) toward the virtual horizontal center line (XX line), as shown in FIG. 7. It may be installed to be inclined, so as to project outward (ie, downward) toward the direction away from the imaginary horizontal center line (XX line) (that is, the bottom edge portion of the barrier 110). Can be installed obliquely.

That is, the heat insulation panel 120 installed to form a step outside the bottom of the barrier 110 has a virtual horizontal center line (XX line) at the edge of the bottom of the barrier 110 as shown in FIG. 7. It may be installed to protrude outward toward the side, as shown in FIG. 8 may be installed to protrude outward toward the bottom edge portion of the barrier 110 from the virtual horizontal center line (XX line) side.

In addition to the above-described example, the heat insulation panel 120 installed outside the bottom of the barrier 110 may be installed to be inclined toward any one of the edges of the bottom of the barrier 110.

That is, the inclination (that is, the step) formed by the heat insulation panel 120 provided outside the bottom part of the barrier 110 is inclined toward the opposite edge part from one edge of the bottom part of the barrier 110. It may include.

For reference, the imaginary vertical center line (YY line) used in the present specification includes not only an imaginary straight line parallel to the side edge (i.e., the edge) portion of the barrier 110 but also an oblique diagonal line not parallel to the side edge. Is a generic term. This indicates that the same can be applied to the virtual horizontal center line (X-X ray) used in the present specification.

On the other hand, although not shown, the heat insulation panel 120 and the heat insulation panel 120 installed outside the bottom portion of the barrier 110 is installed at the end of each of the heat insulation panel 120. Is to meet each other in the outer edge region of the barrier 110, wherein the ends of each insulation panel 120 is sealed to each other so as not to leak the liquefied gas leakage.

As such, the heat insulation panel 120 installed outside the side wall of the barrier 110 and the heat insulation panel 120 installed outside the bottom of the barrier 110 are sealed to each other, thereby liquefying leakage from the barrier 110. When the gas leaking liquid flows down through the gap 3 between the barrier 110 and the heat insulating panel 120, the liquefied gas leaking liquid follows the step of the heat insulating panel 120 without leaking between adjacent heat insulating panels 120. Can flow down.

In this case, a step is also given to each connection member 130 supporting each of the insulating panels 120 so that a step is formed in each of the insulating panels 120 adjacent to each other. That is, each connection member 130 may have different heights as shown in FIGS. 5 to 8.

In this case, a step difference may be formed in the insulation panel 120 attached to each connection member 130 by slightly inclining the overall height by slightly increasing the height of each connection member 130 corresponding to each insulation panel 120. have.

At this time, each of the insulation panel 120 and each connection member 130 interposed between the insulation panel 120 and the barrier 110 is an outer surface of the barrier 110, more specifically, the side portion of the barrier 110. It is installed outside the bottom part.

As described above, each of the insulating panels 120 and each of the connecting members 130 are installed on the outer surface of the barrier 110 using the connecting members 130 having different lengths, thereby forming the insulating panel 120 as the barrier 110. Construction is simpler than installing one inclined with respect to the outer surface of the).

In this way, by the connecting member 130 attached to the outer surface of the barrier 110 to form a step, each of the insulating panels 120 may be arranged in a step.

In addition, each insulation panel 120 is coupled to each other sealed by an adhesive or the like, so that the liquefied gas leaking liquid leaked from the barrier 110 flows through the gap 3 between the barrier 110 and the insulation panel 120. When lowering, the liquefied gas leak liquid may flow down along the step of the heat insulation panel 120 without leaking between adjacent heat insulation panels 120.

As described above, the connecting member 130 has a gap between the insulation panel 120 and the barrier 110 so that the leaked liquefied gas flows along the barrier 110 when the liquefied gas contained in the barrier 110 leaks. (3) is a member.

For reference, the connection member 130 may have a variety of shapes, such as columnar, box-shaped, polyhedral.

That is, by interposing a plurality of connection members 130 at regular intervals between the heat insulation panel 120 and the barrier 110, a gap (3) through which fluid can flow between the heat insulation panel 120 and the barrier 110. Is formed.

The liquefied gas leaked to the outside of the barrier 110 through the gap 3 formed between the insulation panel 120 and the barrier 110 flows down the barrier 110 more quickly.

At this time, the gap 3 between the barrier 110 and the heat insulation panel 120 may have a very narrow gap. Therefore, when the amount of leaked liquefied gas is large, the leaked liquefied gas can flow not only along the barrier 110 but also along the stepped heat insulating panel 120, it can be moved to a desired position more quickly.

This is because when the barrier 110 is broken or a crack occurs and the liquefied gas contained in the liquefied gas storage tank 100 leaks, the leaked liquefied gas flows along the surface of the barrier 110 to liquefy the gas storage tank 100. This is to prevent direct damage to the hull 1 by being collected at a predetermined position of the lower part.

In order to collect the liquefied gas leakage liquid flowing down to the lower portion of the liquefied gas storage tank 100, as shown in Figure 1, the leakage liquid collecting device 140 is used.

Leakage liquid collecting device 140 is a device for collecting the liquefied gas leaking from the barrier 110 when the leakage occurs in the barrier (110).

Leak solution collecting device 140 may be installed on the outside of the heat insulation panel 120, in the present embodiment may be a drip tray (drip tray) used as the leaking liquid collecting device 140.

Although not shown, the leak liquid collecting device 140 may further include a leak liquid storage tank capable of receiving the liquefied gas leak liquid collected from the drip tray, in which case the leak liquid storage tank may be a barrier ( It may be formed at the bottom of the (110).

Specifically, in the present embodiment, as shown in FIG. 3, a gap screen 150 may be installed in the transverse direction between the barrier 110 and the insulation panel 120 installed outside the side surface of the barrier 110. The first drain port 160a may be formed in the insulation panel 120 disposed adjacent to the gap blocking film 150 so that the liquefied gas leaking liquid collected in the gap blocking film 150 is discharged to the outside through the gap 3.

In the present embodiment, the leakage liquid collecting device 140, that is, the drip tray may be installed on the outside of the heat insulating panel 120 to be adjacent to the first drain port 160a as shown in FIG. That is, the leakage liquid collecting device 140 may be disposed between the heat insulation panel 120 and the hull inner surface 2 installed outside the side portion of the barrier 110.

The gap screen 150 is liquefied provided between the side surface of the barrier 110 and the insulation panel 120 so that the liquefied gas leaking liquid leaked from the barrier 110 can be discharged to the outside of the side surface of the barrier 110 more quickly. As the gas leak liquid receiver, it can be installed extending in the longitudinal direction of the gap (3).

Specifically, the gap blocking film 150 may be installed to be inclined downward toward the first drain hole 160a as shown in FIG. 9.

Therefore, when the liquefied gas leaks, the liquefied gas leaking liquid flowing down the outer side of the side wall of the barrier 110 is collected in the gap screen 150 as shown in FIG. 9 and then discharged to the outside through the first drain hole 160a. Can be.

The liquefied gas leak liquid discharged to the outside through the first drain port 160a may be collected by the leak liquid collection device 140 installed adjacent to the first drain port 160a.

For reference, the gap screen 150 may be made of a heat-resistant material to withstand cryogenic liquefied gas like the barrier 110, for example, made of a metal material such as aluminum alloy, stainless steel, Ni-9% steel. Can be.

On the other hand, as shown in FIG. 4, the second drain port 160b may be formed in the heat insulation panel 120 installed outside the bottom of the barrier 110 to discharge the liquefied gas leakage liquid collected in the gap 3. The leaking liquid collecting device 140 may be installed below the second drain hole 160b.

In detail, the leaking liquid collecting device 140 may be installed below the second drain hole 160b formed at the lowermost end of the insulating panel 120 installed outside the bottom of the barrier 110. At this time, the leakage liquid collecting device 140 is disposed below the corresponding to the position of the second drain (160b).

A plurality of second drain holes 160b may be installed at the lowermost end of the insulation panel 110, and the leak liquid collecting device 140 may be installed corresponding to the plurality of second drain holes 160b. At this time, as the leaking liquid collecting device 140, a member of a drip tray shape having a cross-sectional channel shape may be used.

On the other hand, except for the heat insulation panel 120 installed on the second drain 160b to flow the leaked liquefied gas, the remaining heat insulation panels 120 are coupled to each other through a separate fastening member or adhesive to structurally increase safety The liquefied gas may be sealed so as not to leak from a place where the second drain 160b is not installed.

Therefore, the liquefied gas leaked from the barrier 110 is viewed to the leakage liquid collecting device 140 through the first drain port 160a or the second drain port 160b along the inclination (ie, the step) of the heat insulation panel 120. It can be discharged quickly and effectively.

In this case, although not shown, by placing the leak liquid collecting device 140 in the center portion of the virtual horizontal center line (XX line) shown in Figure 2, by collecting the leak liquid installed in the liquefied gas storage tank 100 The total number of devices 140 can be reduced, thereby reducing the materials and installation costs required.

As described above, according to the present exemplary embodiment, the liquefied gas leaked from the barrier 110 is inclined so that a step is formed in the plurality of insulation panels 120 installed on the side portion or the bottom of the barrier 110. Liquefied gas leakage can be collected more quickly to the desired place when flowing along the slope of the), and the liquefied gas leaked to the leakage liquid collecting device 140 more quickly by shortening the path to the liquefied gas leakage flows. Can be discharged effectively.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

1000: ship with liquefied gas storage tank
100: liquefied gas storage tank
1: hull 2: inner hull
3: niche
110: barrier 112: interior space
120: insulation panel 130: connecting member
140: leaking liquid collecting device 150: gap screening film
160a: first drain port 160b: second drain port
170: support

Claims (11)

A barrier forming an inner space to store liquefied gas;
A plurality of heat insulation panels installed outside the barrier;
A connection member disposed between the heat insulation panel and the barrier so that a gap is maintained between the heat insulation panel and the barrier; And
Installed on the outside of the insulation panel, and includes a leaking liquid collecting device for collecting the liquefied gas leaking liquid leaked from the barrier,
The plurality of insulation panels may be inclined at a height difference for each connection member corresponding to each insulation panel so that a step is formed between the insulation panels adjacent to each other. Liquefied gas storage tank, characterized in that formed.
The method of claim 1,
The leaking liquid collecting device is a liquefied gas storage tank including a drip tray (drip tray).
The method of claim 1,
Among the plurality of heat insulation panels, a heat insulation panel provided outside the side part of the barrier is a direction toward the virtual vertical center line or vertical to the virtual vertical line when viewed from an imaginary vertical center line that crosses the side portion of the barrier in the vertical direction. Liquefied gas storage tank, characterized in that installed inclined away from the center line.
The method of claim 1,
Liquefied gas storage tank, characterized in that the thermal insulation panel is installed on the outer side of the barrier of the plurality of thermal insulation panel is inclined toward any one of the edges of the side portion of the barrier.
The method according to claim 3 or 4,
Among the plurality of heat insulation panels, the heat insulation panel installed outside the bottom portion of the barrier, in the direction toward the imaginary horizontal center line across the bottom portion of the barrier, or in the imaginary horizontal center line Liquefied gas storage tank, characterized in that installed inclined in the direction away.
The method according to claim 3 or 4,
Liquefied gas storage tank, characterized in that the heat insulation panel is provided on the outer side of the bottom of the barrier of the plurality of heat insulation panel is inclined toward any one of the edges of the bottom portion of the barrier.
The method of claim 1,
Each of the thermal insulation panel installed outside the side wall portion of the barrier and the thermal insulation panel installed outside the bottom portion of the barrier portion is characterized in that the corresponding ends are bonded to each other by an adhesive and are tightly connected to each other at the edge outer region of the barrier. Liquefied gas storage tanks.
The method of claim 1,
Between the barrier and the insulation panel provided on the outer side of the side wall of the barrier is provided with a gap screen in the transverse direction,
A first drain hole is formed in the insulation panel adjacent to the gap screen to discharge the liquefied gas leaking liquid collected from the gap screen.
The leakage liquid collecting device is a liquefied gas storage tank, characterized in that installed on the outside of the insulation panel adjacent to the first drain.
9. The method of claim 8,
The gap screen is a liquefied gas storage tank, characterized in that installed downwardly inclined toward the first drain.
The method of claim 1,
A second drain hole is formed in the heat insulation panel installed outside the bottom of the barrier so that the liquefied gas leaking liquid collected in the gap is discharged.
The leaking liquid collecting device is a liquefied gas storage tank, characterized in that installed under the second drain.
A hull;
Ship comprising a liquefied gas storage tank according to any one of claims 1 to 2 installed in the hull.

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