Liquefied hydrogen storage tank

Abstract

To provide a liquefied hydrogen storage tank that comprises a tank body and a dike, is excellent in maintainability of a pump for delivery of liquefied hydrogen in the tank body, and restrains an influence on an ambient environment at the time of liquid leakage.SOLUTION: A liquefied hydrogen storage tank 1 comprises: a flat-bottomed tank body 10 comprising an inner tank 12 comprising a storage space 10A for storing liquefied hydrogen LH, and an outer tank 11 formed via a cold insulation layer 13 between itself and the inner tank 12; a dike 2 erected in contact with the outer tank 11 so as to surround the tank body 10; a pump 3 for delivering the liquefied hydrogen LH in the tank body 10 to the outside through an inner tank side plate 12S of the tank body 10; and a housing chamber 51 arranged between an outer peripheral surface 2A of the dike 2 and the storage space 10A, and housing the pump 3. The housing chamber 51 is arranged inside a protrusion part 23 of the dike 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0005]

[0001] The present disclosure relates to a flat-bottom tank for storing liquefied hydrogen.

Background Art

[0002] As a storage facility for cryogenic liquefied gases such as liquefied hydrogen and liquefied natural gas, there is known a flat-bottom liquefied gas storage tank including a flat-bottom tank body for storing the liquefied gas and a liquid retaining dike surrounding the outer periphery of the tank body. The liquid retaining dike is constructed for the purpose of preventing the stored liquefied gas from flowing out around the tank in case of damage or the like to the tank body. In a flat-bottom liquefied gas storage tank, it is necessary to attach a pump for discharging the liquefied gas in the tank body. When discharging the liquefied gas through the tank roof, the pump is installed in the inner tank of the tank body (for example, Patent Document 1).

Prior Art Documents

Patent Documents

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the liquefied gas to be stored is liquefied hydrogen, it may be difficult to install the pump in the inner tank of the tank body due to difficulties in maintenance work etc. It is also possible to provide a space between the liquid retaining dike and the outer tank side plate of the tank body, install the pump in the space, and discharge the liquefied hydrogen through the side plate. In this case, the space becomes a storage space for the liquefied hydrogen leaked from the tank body, but the influence on the surrounding environment due to the vaporization of the leaked liquefied hydrogen becomes a problem.

[0005] The purpose of this disclosure is to provide a liquefied hydrogen storage tank comprising a tank body and a containment dike that offers excellent maintainability for the pump used to discharge liquefied hydrogen from the tank body, and that can suppress the impact on the surrounding environment in the event of leakage. [Means for solving the problem]

[0006] A liquefied hydrogen storage tank according to one aspect of the present disclosure comprises a tank body having an inner tank forming a storage space for storing liquefied hydrogen and an outer tank formed between it and the inner tank with a cooling layer in between; a containment dike erected to surround the outer periphery of the tank body, having an outer peripheral surface and an inner peripheral surface in contact with the side plate of the outer tank; a pump for discharging the liquefied hydrogen in the inner tank to the outside through the side plate of the inner tank; and a housing chamber disposed between the outer peripheral surface of the containment dike and the storage space, for housing the pump. [Effects of the Invention]

[0007] According to the liquefied hydrogen storage tank of this disclosure, in a liquefied hydrogen storage tank equipped with a containment dike in contact with the side plate of the outer tank body, a pump can be installed on the outside of the inner tank without penetrating the side of the containment dike. Furthermore, the pump for discharging liquefied hydrogen from the tank body is easy to maintain, and the impact on the surrounding environment in the event of leakage can be suppressed. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view showing a liquefied hydrogen storage tank according to the first embodiment of this disclosure. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] Figure 3 is a partial cross-sectional view showing the process of replacing the pumps installed in the containment chamber. [Figure 4] Figure 4 is a cross-sectional view showing a liquefied hydrogen storage tank according to the second embodiment. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the liquefied hydrogen storage tank according to this disclosure will be described in detail with reference to the drawings. The liquefied hydrogen storage tank according to this disclosure is a tank for storing cryogenic liquefied hydrogen and is a flat-bottomed tank with a multi-shell structure that is installed on the ground.

[0010] [First Embodiment] Figure 1 is a cross-sectional view showing a liquefied hydrogen storage tank 1 according to the first embodiment of the present disclosure. The liquefied hydrogen storage tank 1 is a multi-shell tank for storing liquefied hydrogen LH. The liquefied hydrogen storage tank 1 includes a tank body 10 with a multi-shell structure, a containment dike 2 erected to surround the tank body 10, a pump 3 for discharging liquefied hydrogen LH from the tank body 10 to the outside, and a housing chamber 51 for the pump 3 located within the structure of the containment dike 2. In Figure 1, a double-shell tank is shown as an example of a multi-shell tank.

[0011] The tank body 10 is a flat-bottomed tank having a storage space 10A for storing liquefied hydrogen LH, and includes an outer tank 11 erected on a tank foundation 21, an inner tank 12 enclosed within the outer tank 11, and a cooling layer 13 positioned between the outer tank 11 and the inner tank 12. The tank foundation 21 is a concrete layer that constitutes the foundation portion of the tank body 10 and the containment dike 2. Both the outer tank 11 and the inner tank 12 have a circular shape when viewed from above and are arranged concentrically. The tank body 10 may also be a multi-shell tank with an intermediate tank between the outer tank 11 and the inner tank 12.

[0012] The outer tank 11 is a sealed body made of metal such as carbon steel or stainless steel, and includes an outer tank bottom plate (outer tank liner) 11B, outer tank side plates (outer tank liners) 11S, and an outer tank roof 11R. The outer tank bottom plate 11B is laid directly on the tank foundation 21 and has a disc shape. The outer tank side plates 11S are erected from the periphery of the outer tank bottom plate 11B and have a cylindrical shape. In this embodiment, the outer tank side plates 11S constitute the outer circumference of the tank body 10. The outer tank roof 11R is attached to the upper end of the cylindrical outer tank side plates 11S so as to close the upper opening of the outer tank side plates 11S and has a dome shape.

[0013] The inner tank 12 is a tank that forms a storage space 10A for actually storing liquefied hydrogen LH. The inner tank 12 is a sealed body made of metal such as stainless steel and is surrounded by the outer tank 11 with spaces of predetermined intervals that form a cooling layer 13. The inner tank 12 includes an inner tank bottom plate 12B, inner tank side plates 12S, and an inner tank roof 12R. The inner tank bottom plate 12B has a disc shape with a smaller diameter than the outer tank bottom plate 11B. The inner tank side plates 12S are erected from the periphery of the inner tank bottom plate 12B and have a cylindrical shape. In this embodiment, the inner tank side plates 12S and the outer tank side plates 11S described above become the side plates of the tank body 10. The inner tank roof 12R is attached to the upper end of the inner tank side plates 12S and has a dome shape. Liquid hydrogen LH is stored inside the inner tank 12, and gas vaporized from the liquid hydrogen LH accumulates in the upper part of the inner tank 12.

[0014] The insulation layer 13 is a layer that utilizes the gap between the outer tank 11 and the inner tank 12 as an insulating space to enhance the insulation performance of the inner tank 12. The insulation layer 13 may contain powder insulation material or solid insulation material. For example, the gap between the outer tank roof 11R and the inner tank roof 12R is filled with powder insulation material such as granular perlite. The gap between the outer tank side plate 11S and the inner tank side plate 12S is filled with granular perlite and glass wool, etc. An insulating block material, such as bubble glass, is laid in the gap between the outer tank bottom plate 11B and the inner tank bottom plate 12B.

[0015] The insulation layer 13 is filled with a cooling material such as granular perlite, along with hydrogen gas, helium gas, nitrogen gas, etc. It is desirable to use a gas that has a boiling point equivalent to or close to that of the stored liquefied hydrogen LH, and from this viewpoint, hydrogen gas or helium gas is preferable. For example, a connecting pipe may be installed to connect the internal space of the inner tank 12 and the space of the insulation layer 13, and the vaporized gas of the stored liquefied hydrogen LH may be introduced into the insulation layer 13.

[0016] The containment dike 2 is erected to prevent the leakage of stored liquefied hydrogen LH into the surrounding area in the event of damage to the tank body 10. The containment dike 2 is a cylindrical concrete structure built on the tank foundation 21. In this embodiment, the containment dike 2 has a structure that does not leave a gap between it and the outer circumference of the tank body 10, that is, the containment dike 2 and the outer tank side plate 11S are integrated. If damage occurs to the tank body 10, the leakage of liquefied hydrogen LH is prevented by the containment dike 2, and the liquefied hydrogen LH will remain in the space of the insulation layer 13. In other words, the space located inside the outer surface 2A of the containment dike 2 becomes the storage space for the leaked liquefied hydrogen LH.

[0017] The containment dike 2 has an outer peripheral surface 2A that is exposed to the outside and an inner peripheral surface 2B that is in contact with the outer tank side plate 11S. The containment dike 2 is characterized by having an annular portion 22 and a protruding portion 23. The annular portion 22 is a cylindrical dike that surrounds the entire outer circumference of the tank body 10. Figure 1 shows an example in which the height of the annular portion 22 is approximately the same as the height of the outer tank side plate 11S. The protruding portion 23 is provided corresponding to the location where the pump 3 is installed and is a rectangular parallelepiped structure formed so that a part of the annular portion 22 protrudes radially outward. As shown in Figure 2, the containment dike 2 has an outer peripheral surface 2A that bulges radially outward at the location where the protruding portion 23 is formed.

[0018] Pump 3 is located on the side of the tank body 10, inside the protruding section 23, and discharges liquefied hydrogen LH to the outside through the side plate of the tank body 10. Pump 3 is connected to an extraction pipe 31 and a discharge pipe 32. Extraction pipe 31 is a pipeline that runs from the outside of the tank body 10, through the outer tank side plate 11S, the insulation layer 13, and the inner tank side plate 12S, to the storage space 10A of the inner tank 12. One end of extraction pipe 31 faces the liquefied hydrogen LH stored in the inner tank 12, and the other end is connected to the inlet end of pump 3. Discharge pipe 32 is a pipeline that extends upward inside the protruding section 23, crosses over the top surface 23T of the protruding section 23, and reaches the outside of the liquefied hydrogen storage tank 1. One end of discharge pipe 32 is connected to the outlet end of pump 3, and the other end is connected to the inlet end of equipment or transport tankers that use liquefied hydrogen LH as fuel.

[0019] In this embodiment, the pump 3 for discharging the liquefied hydrogen LH in the tank body 10 is arranged outside the inner tank 12. This is because it is easier to perform maintenance work than installing the pump 3 in the storage space 10A where the liquefied hydrogen is stored. In this case, a space for installing the pump 3 is required on the side of the tank body 10. In this embodiment, the pump 3 is formed on the ridge portion 23 of the liquid retaining dike 2, and a housing chamber 51 is provided inside thereof, thereby securing a place for installing the pump 3.

[0020] The housing chamber 51 is arranged inside the body of the ridge portion 23 and has a space volume capable of housing the pump 3, a part of the extraction pipe 31, and a part of the discharge pipe 32. The housing chamber 51 may be arranged at an appropriate position between the outer peripheral surface 2A of the liquid retaining dike 2 and the inner tank 12 of the tank body 10. In the first embodiment, by providing the ridge portion 23, a portion where the outer peripheral surface 2A of the liquid retaining dike 2 bulges outward in the radial direction is formed, creating a placement space for the housing chamber 51. An outer wall portion 23A exists between the outer peripheral surface 2A and the housing chamber 51. Thus, as long as an outer wall portion 23A formed of a part of the liquid retaining dike 2 exists on the outside in the radial direction of the housing chamber 51, there is no limitation on the installation mode of the housing chamber 51. In the second embodiment described later, an example of arranging the housing chamber 51 inside the cold insulation layer 13 is shown.

[0021] On the inside in the radial direction of the housing chamber 51, an extraction opening 33 for guiding the extraction pipe 31 into the housing chamber 51 is provided in the body of the ridge portion 23. There is a gap between the inner surface of the extraction opening 33 and the outer peripheral surface of the extraction pipe 31. At the portion where the extraction pipe 31 penetrates the outer tank side plate 11S, the two are joined.

[0022] The rib portion 23 is further provided with a passage 52 for an operator to access the storage chamber 51. The passage 52 has a rectangular or circular horizontal cross-section and extends vertically within the rib portion 23. A lower end opening 53 is formed on the lower end side of the passage 52, and an upper end opening 54 is formed on the upper end side. The lower end opening 53 is an opening communicating with the storage chamber 51. The upper end opening 54 opens to the top surface 23T of the rib portion 23. A ladder 55 is installed in the passage 52 for the operator to move forward and backward. The upstream portion of the dispensing pipe 32 is also disposed within the passage 52. An opening / closing door 56 (sealing portion) for opening and closing the upper end opening 54 is provided at the upper end opening 54. The opening / closing door 56 is normally in a closed state and is opened during maintenance work or the like. By installing the opening / closing door 56, the entry of rainwater, dust, etc. into the storage chamber 51 and the passage 52 can be suppressed, and they can be kept clean.

[0023] Since the spaces of the storage chamber 51 and the passage 52 are spaces isolated from the cold insulation layer 13, they can be made into an air environment. Therefore, the operator can easily access the pump 3 in the storage chamber 51 through the passage 52, facilitating maintenance work and the like. In addition, in order to enhance the explosion-proof performance, the spaces of the storage chamber 51 and the passage 52 may be filled with an inert gas such as nitrogen gas (GN2).

[0024] According to the liquefied hydrogen storage tank 1 according to the first embodiment, the inner space of the outer tank 11 and the space inside the body of the protruding portion 23 form a liquid storage space capable of storing the liquid leaking from the inner tank 12. And the upper surface of the liquid storage space is sealed by the outer tank roof 11R and the opening / closing door 56. Therefore, even if liquid leakage occurs due to damage to the tank body 10 or the like, the leaked liquid is confined in the liquid storage space, suppressing the outflow of the vaporized liquefied hydrogen LH.

[0025] Furthermore, a housing chamber 51 for the pump 3 is provided between the outer circumferential surface 2A of the containment dike 2 and the storage space 10A of the tank body 10, and the pump 3, which discharges liquefied hydrogen LH to the outside through the tank side plate, is housed in this housing chamber 51. Therefore, maintenance work can be made easier compared to when the pump is installed inside the inner tank 12. When the pump 3 is installed inside the inner tank 12 of a liquefied hydrogen storage tank 1 that stores liquefied hydrogen LH, it is necessary to remove the pump 3, which is immersed in the liquefied hydrogen LH, to the outside, making it difficult to devise a maintenance method that is excellent in terms of safety and workability. In contrast, in this embodiment, the pump 3 is located in a housing chamber 51 outside the inner tank side plate 12S, so the work of removing the pump 3 from inside the inner tank 12 does not occur, and maintenance work can be made easier. In addition, the housing chamber 51 is located inside the structure of the protruding portion 23 of the containment dike 2. Since the housing chamber 51 is formed inside the concrete containment dike 2, the pump 3 can be placed in a strongly protected environment. Therefore, not only is maintenance of pump 3 easier, but its resistance to disasters and other unforeseen events can also be enhanced.

[0026] Figure 3 is a partial cross-sectional view showing the replacement of a pump 3 installed in the storage chamber 51 of a liquefied hydrogen storage tank 1 according to the first embodiment. The passage 52 provided in the protruding section 23 is a passage that extends linearly in the vertical direction and has a horizontal cross-sectional size that allows the pump 3 to pass through. From the viewpoint of an access route to the storage chamber 51, it is sufficient for the passage 52 to be large enough for workers to pass through. However, in this embodiment, considering the replacement of the pump 3, the passage 52 is set to a size that allows the pump 3 to pass through without dismantling. If the pump 3 malfunctions or deteriorates, it may be necessary to replace the pump 3. Figure 3 shows the state of lifting and carrying in the pump 3 through the passage 52.

[0027] During the aforementioned loading and unloading, a lifting crane 6 is installed near the tank body 10. The crane 6 may be installed on the outer tank roof 11R, or a mobile crane may be used. When loading the pump 3 from the housing chamber 51, the opening door 56 is opened, and a lifting wire 61 is lowered from the upper opening 54. The pump 3, with the outlet pipe 31 and discharge pipe 32 removed, is suspended from the lower end of the lifting wire 61. Then, the lifting crane 6 is operated to lift the pump 3, and the pump 3 is loaded to the outside of the liquefied hydrogen storage tank 1. Loading the pump 3 into the housing chamber 51 follows the reverse process. By using the crane 6 in this way, maintenance work on the pump 3 can be made even easier.

[0028] [Second Embodiment] Figure 4 is a cross-sectional view showing a liquefied hydrogen storage tank 1A according to the second embodiment. The liquefied hydrogen storage tank 1A has a structure in which a storage chamber 510 for housing a pump 3 is located within the insulation layer 13 of the tank body 10, rather than within the containment dike 2. The storage chamber 510 is located at a height close to the height of the inner tank bottom plate 12B, in the space between the outer tank 11 and the inner tank 12, that is, the space that becomes the insulation layer 13. The storage chamber 510 is isolated from the space of the insulation layer 13 and is a space that workers can enter.

[0029] Pump 3 is housed in the containment chamber 510 as described above, and is connected to the extraction pipe 31 and the discharge pipe 32. The extraction pipe 31 penetrates the inner tank side plate 12S and enters the storage space 10A. The containment dike 2 has a protruding section 230 at the location of the pump 3, which is the same as in the first embodiment. However, in the second embodiment, a part of the outer tank 11 is contained within the protruding section 230, and the insulation layer 13 is partially extended radially outward at the location of the protruding section 230. That is, a part of the outer tank side plate 11S and an extended portion 11RA of the outer tank roof 11R are contained within the protruding section 230. Since the containment chamber 510 is installed inside the tank body 10, the degree to which it protrudes radially outward from the annular section 22 (see Figures 1 and 2) can be made smaller than in the first embodiment.

[0030] A passageway 520 is provided in the protruding section 230, which connects to the storage chamber 510. The passageway 520 extends vertically along the protruding section 230 and is connected to the upper part of the storage chamber 510. The space of the storage chamber 510 and the passageway 520 is isolated from the insulation layer 13 and is incorporated into the insulation layer 13 at the protruding section 230. The discharge piping 32 and the ladder 55 are also arranged to face upward within the passageway 520.

[0031] The upper end of the passageway 520 penetrates the extension 11RA of the outer tank roof 11R and the top wall of the protruding section 230 of the containment dike 2, and an upper end opening 54 is provided on the top surface 23T. An opening / closing door 56 is provided to open and close this upper end opening 54.

[0032] According to the liquefied hydrogen storage tank 1A of the second embodiment, the inner space of the outer tank 11, including the space of the containment chamber 510 and the passage 520, becomes a liquid storage space that can store liquid leaking from the inner tank 12. The upper surface of the liquid storage space is sealed by the outer tank roof 11R and the opening / closing door 56. Therefore, even if liquid leakage occurs due to damage to the tank body 10, the leaked liquid is contained in the liquid storage space, and the outflow of vaporized liquefied hydrogen LH can be suppressed. In addition, in order to form the containment chamber 510, it is not necessary to significantly increase the radial width of the protruding portion 230 of the containment dike 2. Therefore, there is an advantage in that the size of the tank body 10 can be increased in a limited site area.

[0033] [Other embodiments] Although embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. In the first and second embodiments, examples were shown in which the protruding portions 23 and 230 have the same height as the annular portion 22. Alternatively, the protruding portions may be limited to the minimum size necessary to surround the housing chamber 51 of the pump 3. For example, the protruding portions may be about half the height of the annular portion 22 and the outer tank side plate 11S, with the housing chamber 51 of the pump 3 provided inside them.

[0034] [Summary of this disclosure] The specific embodiments described above include disclosures having the following configurations.

[0035] A liquefied hydrogen storage tank according to one aspect of the present disclosure comprises a tank body having an inner tank forming a storage space for storing liquefied hydrogen and an outer tank formed between it and the inner tank with a cooling layer in between; a containment dike erected to surround the outer periphery of the tank body, having an outer peripheral surface and an inner peripheral surface in contact with the side plate of the outer tank; a pump for discharging the liquefied hydrogen in the inner tank to the outside through the side plate of the inner tank; and a housing chamber disposed between the outer peripheral surface of the containment dike and the storage space, for housing the pump.

[0036] This liquefied hydrogen storage tank allows for the installation of a pump outside the inner tank and inside the outer surface of the containment dike, in a tank with an integrated containment dike. In other words, the pump can be installed without penetrating the side surface of the containment dike. Therefore, maintenance work can be made easier compared to when the pump is installed inside the inner tank. In addition, since the inner tank is covered by the outer tank and containment dike, leakage of liquefied hydrogen and diffusion of vaporized hydrogen gas can be prevented.

[0037] In the above-described liquefied hydrogen storage tank, the containment dike is a concrete containment dike, the storage chamber is located within the structure of the containment dike, and a passage may be provided within the structure that penetrates from the storage chamber through the top surface of the containment dike.

[0038] With this liquefied hydrogen storage tank, a storage chamber is formed within a concrete containment dike, allowing the pump to be placed in a strongly protected environment. Therefore, not only is maintenance of the pump easier, but its resistance to disasters and other unforeseen events is also enhanced.

[0039] In the above-described liquefied hydrogen storage tank, the storage chamber may be located within the insulation layer, and a passage may be provided within the tank body that extends from the storage chamber through the roof of the outer tank.

[0040] With this liquefied hydrogen storage tank, since the storage chamber is located in the insulation layer within the tank body, the degree to which the containment dike protrudes radially in order to form the storage chamber can be reduced.

[0041] In the above-described liquefied hydrogen storage tank, it is desirable to further provide a sealing part that can be opened and closed to seal the opening of the passage provided on the top surface of the containment dike, or the opening of the passage provided on the roof of the outer tank.

[0042] By providing the aforementioned sealing portion, the outflow of liquefied hydrogen through the passage in the event of leakage can be suppressed. Furthermore, the entry of rainwater, dust, etc. can be suppressed, and the passage and the containment chamber can be kept clean.

[0043] In the above-described liquefied hydrogen storage tank, it is desirable that the containment dike has a protruding ridge that projects radially outward at the circumferential position where the storage chamber is located.

[0044] With this liquefied hydrogen storage tank, even when a pump housing chamber is installed within the containment dike, it is only necessary to partially extend the containment dike radially outward. Therefore, the area occupied by the liquefied hydrogen storage tank can be reduced. [Explanation of Symbols]

[0045] 1. Liquefied hydrogen storage tank 10 Tank body 11 Outer tank 11S Outer tank side plate (side plate / outer circumference of the tank body) 12 Inner tank 13. Cooling layer 2 Liquid dike 2A Outer surface 2B Inner surface 22 Ring section 23 Projection (framework) 23T top 3 pumps 4. Roof 41 Dome base 51, 510 containment rooms 52, 520 aisle 53 Bottom opening 54 Top opening (opening) 56 Opening / closing door (sealing section) LH (Liquefied Hydrogen)

Claims

1. A tank body having an inner tank that forms a storage space for storing liquefied hydrogen, and an outer tank formed between the inner tank and the outer tank with a cooling layer in between, A containment dike having an outer circumferential surface and an inner circumferential surface in contact with the side plate of the outer tank, erected to surround the outer periphery of the tank body, A pump that discharges the liquefied hydrogen inside the inner tank to the outside through the side plate of the inner tank, A containment chamber is positioned between the outer surface of the containment dike and the storage space, and which houses the pump and is part of the storage space for storing liquefied hydrogen leaking from the inner tank, A passageway extending from the aforementioned containment chamber to the outside, A sealing part that allows the opening of the passage to be opened and closed, and seals the liquefied hydrogen leaking from the inner tank or vaporized liquefied hydrogen to be contained in the storage space, A liquefied hydrogen storage tank equipped with [a specific feature / feature].

2. In the liquefied hydrogen storage tank according to claim 1, The aforementioned containment dike is a concrete containment dike. The containment chamber is located within the structure of the containment dike. The aforementioned passage is a liquefied hydrogen storage tank, which is arranged within the structure so as to penetrate from the storage chamber through the top surface of the containment dike.

3. In the liquefied hydrogen storage tank according to claim 1, The aforementioned containment chamber is located within the aforementioned cooling layer. The aforementioned passage is located within the tank body of the liquefied hydrogen storage tank, and is arranged to penetrate from the storage chamber through the roof of the outer tank.

4. In the liquefied hydrogen storage tank according to Claim 1, The passage extends upward from the storage chamber and has a horizontal cross-sectional size that allows the pump to pass through, and is a liquefied hydrogen storage tank.

5. In a liquefied hydrogen storage tank according to any one of claims 1 to 4, The containment dike is a liquefied hydrogen storage tank having a protruding ridge that extends radially outward at the circumferential position where the containment chamber is located.

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