Multi-layer shell tank

Abstract

The multi-layer shell can comprises: a first tank; a second groove surrounding the first groove; a heat protection layer disposed between the first groove and the second groove and covering the outer wall of the first groove; and a first pipe for supplying air or exhausting air, the first pipe having a first opening disposed between the grooves in a first inter-groove region between the first groove and the heat shielding layer, the first pipe extending outward through the groove.

Description

Technical Field

[0001] The present disclosure relates to the structure of a multi-layer shell tank for storing low-temperature liquefied gas. Background Art

[0002] For example, in a tank storing low-temperature liquefied gas such as liquid hydrogen, the temperature difference between the liquefied gas and the outside is large, so a heat-proof layer with high heat insulation performance is required to suppress the gasification of the liquefied gas inside the tank. Therefore, as a tank storing liquefied gas, a multi-layer shell tank is known: it has an inner tank for storing liquefied gas and an outer tank surrounding the inner tank, and a heat-proof layer is provided between the inner and outer tanks. For example, Patent Document 1 discloses such a multi-layer shell tank.

[0003] The multilayer shell tank disclosed in Patent Document 1 comprises an inner tank storing liquefied gas, an outer tank accommodating the inner tank, and a heat-proof layer disposed in a region between the inner tank and the outer tank and composed of a heat insulating material.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2020 / 202578 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the multilayer shell tank as described above, there is a structure in which the gas that is the same as the vaporized gas of the liquefied gas contained in the inner tank or the inert gas is filled between the inner and outer tanks. In such a multilayer shell tank, during the gas filling, gas replacement, cooling and heating between the inner and outer tanks, an air supply and exhaust treatment is performed to forcibly discharge the gas existing between the inner and outer tanks and introduce new gas. Insulating members, supporting members and strength members that constitute a heat-proof layer are arranged between the inner and outer tanks, and there are areas where it is difficult for the gas to flow. During the air supply and exhaust treatment between the inner and outer tanks, the flow of the gas is likely to be retained at the area between the inner and outer tanks where it is difficult for the gas to flow, and the efficiency of the air supply and exhaust treatment may be reduced.

[0009] The present disclosure is completed in view of the above situation, and its purpose is to provide the following technology: in a multi-layer shell tank having a first groove, a second groove surrounding the first groove, and a heat-proof layer arranged between the first groove and the second groove and covering the first groove, the efficiency of the air supply and exhaust treatment between the grooves is improved.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, a multilayer shell tank of one embodiment of the present invention comprises: a first groove; a second groove, which surrounds the first groove; a heat-proof layer, which is arranged between the first groove and the second groove and covers the outer wall of the first groove; and a first pipe for air supply or exhaust, which has a first opening portion in the first groove area between the first groove and the heat-proof layer, and the first pipe passes through the groove and extends to the outside.

[0012] Effects of the Invention

[0013] According to the present disclosure, a technology can be provided for improving the efficiency of air supply and exhaust treatment between tanks in a multilayer shell tank including a first tank, a second tank surrounding the first tank, and a heat-resistant layer disposed between the first tank and the second tank and covering the first tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a vertical cross-sectional view showing a schematic structure of a multilayer shell tank according to one embodiment of the present disclosure.

[0015] Figure 2 This is an enlarged view of the front end portion of the first pipe.

[0016] Figure 3 It is a diagram showing a configuration example of a first pipe and a second pipe having a common portion.

[0017] Figure 4 It is a diagram showing a structural example of a first pipe having a plurality of first openings arranged in a ring shape.

[0018] Figure 5 This is a diagram showing a configuration example of a first pipe having first openings both above and below a first groove. DETAILED DESCRIPTION

[0019] Next, embodiments of the present disclosure will be described with reference to the drawings. Figure 1 It is a vertical cross-sectional view showing a schematic structure of a multilayer shell tank 1 according to one embodiment of the present disclosure. Figure 1 The multilayer shell tank 1 shown is a tank for storing low-temperature liquefied gas L. Examples of the liquefied gas L include liquid hydrogen and liquefied natural gas. The multilayer shell tank 1 can be carried on a floating structure such as a ship or an offshore structure, or can be installed on a land base. In addition, the multilayer shell tank 1 can be a cargo tank for storing the liquefied gas L as cargo, or a fuel tank for storing the liquefied gas L as fuel.

[0020] The multilayer shell tank 1 is a double-layer shell tank having a first tank 21 for storing liquefied gas L and a second tank 22 surrounding the first tank 21. The first tank 21 and the second tank 22 are separated in the radial direction of the multilayer shell tank 1. However, the multilayer shell tank 1 of the present disclosure is not limited to a double-layer shell tank, and may also have a shell (i.e., tank) with three or more layers having an additional tank outside the second tank 22. By replacing the relationship between the first tank 21 and the second tank 22 of the present disclosure with the relationship between two adjacent tanks inside and outside, the present disclosure can be applied to a multilayer shell tank with three or more layers.

[0021] A heat-proof layer 24 is disposed between the first groove 21 and the second groove 22. The heat-proof layer 24 covers the outer wall of the first groove 21 in the groove 23 to suppress heat input to the first groove 21. The heat-proof layer 24 is formed of, for example, a heat-insulating board.

[0022] The multilayer shell tank 1 is supported on the tank foundation 10 via the support bodies 71 and 72. The tank foundation 10 is, for example, a hull of a floating structure such as a ship or an offshore structure, or a concrete foundation of a land base. The support bodies 71 and 72 are cylindrical bodies extending in a substantially vertical direction, and mainly include a first skirt 71 supporting the first groove 21 and a second skirt 72 supporting the second groove 22. The first skirt 71 is surrounded by the second skirt 72. The upper end of the second skirt 72 is engaged with the second groove 22, and the lower end of the second skirt 72 is fixed to the tank foundation 10. The upper end of the first skirt 71 is engaged with the first groove 21 in the groove space 23. The first skirt 71 passes through the groove space 23, and the lower end of the first skirt 71 is fixed to the tank foundation 10. At the intersection of the first groove 21 and the first skirt 71, there is a narrow portion where the flow of gas is retained in a space sandwiched between the first groove 21 and the first skirt 71. In addition, at the intersection of the heat-proof layer 24 covering the first groove 21 and the first skirt 71 , there is a narrow portion where the flow of gas is stagnant and the space is surrounded by the heat-proof layer 24 and the first skirt 71 .

[0023] Here, the area between the first groove 21 and the heat-proof layer 24 is referred to as the "first inter-groove area 25", and the area between the heat-proof layer 24 and the second groove 22 is referred to as the "second inter-groove area 26". That is, a first inter-groove area 25 surrounding the first groove 21 and a second inter-groove area 26 surrounding the first inter-groove area 25 are formed in the inter-groove 23. The first inter-groove area 25 and the second inter-groove area 26 may be connected spaces or independent spaces. The first inter-groove area 25 may be formed in a gap between the outer wall of the first groove 21 and the heat-proof layer 24, or may be formed by voids or holes formed on the surface of the heat-proof layer 24 opposite to the outer wall of the first groove 21. In addition, as Figure 2 As shown, when a recessed portion 25 a that is retreated from the outer wall of the first groove 21 relative to other portions is formed on the surface of the heat-resistant layer 24 , the space within the recessed portion 25 a is also included in the first inter-groove region 25 .

[0024] return Figure 1 The first inter-tank region 25 and the second inter-tank region 26 of the inter-tank 23 are respectively filled with an inter-tank gas G. The inter-tank gas G is a gas of the same type as the gasification gas of the liquefied gas L or an inert gas. For example, when the liquefied gas L is liquid hydrogen, hydrogen is used as the inter-tank gas G. In addition, when the liquefied gas L is liquefied natural gas, nitrogen is used as the inter-tank gas G.

[0025] The multilayer shell tank 1 has a first pipe 3 and a second pipe 4 for supplying gas to or exhausting gas from the tank 23. The first pipe 3 and the second pipe 4 can be widely used for filling, gas replacement, cooling, and heating of the tank 23 with the tank gas G, and other gas supply and exhaust processes accompanied by exhausting gas from and supplying gas to the tank 23.

[0026] The first pipe 3 has a first opening 31 opened in the first inter-tank region 25. The first pipe 3 is mainly used for supplying and / or exhausting air to the first inter-tank region 25. Figure 1 In the example shown, one system of first piping 3 is used for both air supply and exhaust, but a first piping 3 of the air supply system having a first opening 31 as an air supply port and a first piping 3 of the exhaust system having a first opening 31 as an exhaust port may be separately provided.

[0027] The first pipe 3 passes through the second groove 22 , passes through the second groove area 26 in the groove area 23 , and the first opening 31 provided at the front end portion 3 a is arranged in the first groove area 25 .

[0028] Figure 2 FIG. 3 is an enlarged view of the front end portion 3a of the first pipe 3. Figure 2 As shown, the first opening 31 opened in the first groove region 25 is provided at the front end portion 3a of the first pipe 3. The front end portion 3a of the first pipe 3 is supported by the first support member 36 fixed to the first groove 21. The middle portion 3b of the first pipe 3 is arranged along the inner wall of the second groove 22 in the second groove region 26 and is supported by the second support member 37 fixed to the second groove 22.

[0029] The first pipe 3 has an expansion and contraction portion 38 between the front end portion 3a supported by the first support member 36 and the middle portion 3b supported by the second support member 37. The expansion and contraction portion 38 is formed of, for example, a flexible hose. When the liquefied gas L is stored in the first tank 21, the relative position of the front end portion 3a supported by the first tank 21 and the middle portion 3b supported by the first tank 21 in the first pipe 3 changes due to the cold or hot of the liquefied gas L. The change in the relative position of the front end portion 3a and the middle portion 3b of the first pipe 3 is absorbed by the expansion and contraction of the expansion and contraction portion 38, thereby reducing the stress generated in the first pipe 3, the stress generated at the joint portion between the first support member 36 and the first tank 21, and the stress generated at the joint portion between the second support member 37 and the second tank 22.

[0030] return Figure 1 The second pipe 4 has a second opening 41 opened in the second inter-tank region 26. The second pipe 4 is mainly used for supply and exhaust treatment of the second inter-tank region 26. Figure 1 In the illustrated multilayer shell tank 1, the second pipe 4 is used for both air supply and exhaust. However, a second pipe 4 of an air supply system having a second opening 41 as an air supply port and a second pipe 4 of an exhaust system having a second opening 41 as an exhaust port may be separately provided.

[0031] The second pipe 4 passes through the second groove 22 and the second groove area 26 in the groove 23, and the second opening 41 provided at the front end is arranged in the second groove area 26. The first pipe 3 and the second pipe 4 are independent pipes in the groove 23 of the multilayer shell tank 1. However, the first pipe 3 and the second pipe 4 may also share some pipes. Figure 3 It is a diagram showing a configuration example of the first pipe 3 and the second pipe 4 having a common portion. Figure 3 The illustrated multilayer shell tank 1 includes: a common pipe 30 that penetrates the second groove 22 and passes through the second groove area 26 in the groove space 23; a first branch pipe 35 that is connected to the common pipe 30 and has a first opening 31 at the front end; and a second branch pipe 45 that is connected to the common pipe 30 and has a second opening 41 at the front end. Here, the combination of the common pipe 30 and the first branch pipe 35 functions as the first pipe 3, and the combination of the common pipe 30 and the second branch pipe 45 functions as the second pipe 4.

[0032] return Figure 1The first pipe 3 has at least one first opening 31 opened within the range of the height where the first groove 21 and the second groove 22 overlap in the vertical direction. In addition, the second pipe 4 has at least one second opening 41 opened within the range of the height where the first groove 21 and the second groove 22 overlap in the vertical direction. In the slot 23, especially within the range of the height where the first groove 21 and the second groove 22 overlap in the vertical direction, the heat insulating members, supporting members, and strength members that constitute the heat-proof layer 24 are concentratedly arranged, and there is a part where gas is difficult to flow. It is preferable to arrange the openings 31 and 41 in such a part where gas is difficult to flow.

[0033] For example, the first pipe 3 preferably has at least one first opening 31 disposed in a narrow portion sandwiched between the first groove 21 and the first skirt 71 at the intersection of the first groove 21 and the first skirt 71. For example, the second pipe 4 preferably has a second opening 41 disposed in a narrow portion sandwiched between the heat-proof layer 24 and the first skirt 71 at the intersection of the heat-proof layer 24 and the first skirt 71. As described above, the flow of gas is more likely to stagnate in a narrow portion than in other portions, but by supplying and / or exhausting gas through the openings 31 and 41 disposed in the narrow portion, the flow of gas in the narrow portion is promoted, and the efficiency of the supply and exhaust treatment is improved.

[0034] The first pipe 3 and the second pipe 4 merge at a confluence portion 50 disposed in an exposed location outside the multilayer shell tank 1. The air supply system or the exhaust system is connected to the confluence portion 50 via a filter 34. The filter 34 recovers dust from the gas flowing through the first pipe 3 and the second pipe 4. The air supply system is provided with a gas source such as a blower for air supply, a cooling gas source, a heating gas source, a replacement gas source, or an inter-tank gas source. The exhaust system is provided with, for example, an exhaust blower, a release tower for releasing the inter-tank gas G to the atmosphere outside the multilayer shell tank 1 (i.e., an exposed location), and a fuel use device for using the inter-tank gas G as fuel. One of the air supply system and the exhaust system is connected to the confluence portion 50, but the connected systems of the air supply system and the exhaust system can also be switched by a switching valve.

[0035] By merging the first pipe 3 and the second pipe 4 at the confluence portion 50, the gas supply and / or exhaust of the gas between the slots 23 can be performed by one system, and the number of filters 34 and blowers can be reduced. In addition, in the confluence portion 50, the first pipe 3 and the second pipe 4 are connected, thereby the pressure of the first slot area 25 and the second slot area 26 are equalized, and the floating and damage of the heat protection layer 24 can be prevented. However, the first pipe 3 and the second pipe 4 can also have a filter 34 and a blower, respectively. In this case, the temperature, pressure or supply amount of the gas supplied to the first slot area 25 and the second slot area 26 can be independently adjusted, or the discharge amount from the first slot area 25 and the second slot area 26 can be independently adjusted.

[0036] Valves such as a flow path switching valve and a flow rate regulating valve for operating the first pipe 3 and the second pipe 4 may be centrally arranged at the confluence portion 50 of the first pipe 3 and the second pipe 4. Thus, an operator can centrally operate the valves of the first pipe 3 and the second pipe 4.

[0037] The first pipe 3 and the second pipe 4 are provided with a sampling device 51 at an exposed location outside the multilayer shell tank 1. The sampling device 51, for example, takes gas discharged from the tank 23 or gas supplied to the tank 23 to detect the concentration of the gas. The sampling device 51 may also be arranged at the confluence portion 50 of the first pipe 3 and the second pipe 4. In this way, by providing the sampling device 51 on the first pipe 3 and the second pipe 4, the concentration of the gas supplied to the tank 23 or the gas discharged from the tank 23 can be detected, and the gas supply flow rate or the exhaust flow rate can be adjusted.

[0038] Figure 1 The illustrated first pipe 3 has the first openings 31 respectively arranged at the bottom and the narrow portion of the slot 23, but the first pipe 3 preferably has a plurality of first openings 31. More preferably, the plurality of first openings 31 are dispersedly arranged on a substantially horizontal circumference surrounding the first slot 21 in the first slot region 25. The gas supplied from the plurality of first openings 31 arranged in an annular shape is diffused substantially evenly in the first slot region 25.

[0039] Figure 4 This is a diagram showing a configuration example of the first pipe 3 having a plurality of first openings 31 arranged in a ring shape. Figure 4 The illustrated first pipe 3 includes an annular header 32 and a plurality of nozzles 33 connected to the header 32 and having a first opening 31 at the tip. The combination of the header 32 and the plurality of nozzles 33 may be provided in multiple layers in the vertical direction.

[0040] In addition, similarly to the first pipe 3, the second pipe 4 may have a plurality of second openings 41, and the plurality of second openings 41 may be dispersedly arranged on a substantially horizontal circumference surrounding the first groove 21 in the second inter-groove region 26. However, the structure of the first pipe 3 having a plurality of first openings 31 and the structure of the second pipe 4 having a plurality of second openings 41 are not limited to Figure 4 Example.

[0041] Figure 5 This is a diagram showing a configuration example of the first pipe 3 having the first openings 31 both above and below the first groove 21 . Figure 5The illustrated first piping 3 includes: a lower first piping 3B having a first opening 31 disposed in the first inter-slot region 25 at a position lower than the first slot 21; and an upper first piping 3U having a first opening 31 disposed in the first inter-slot region 25 at a position higher than the first slot 21. The lower first piping 3B and the upper first piping 3U can be used as air supply pipes at the same time. In addition, the lower first piping 3B and the upper first piping 3U can be used as exhaust pipes at the same time. Alternatively, the lower first piping 3B and the upper first piping 3U can be used as an air supply pipe on one side and an exhaust pipe on the other side. The first piping 3 used as an exhaust pipe is connected to an exhaust system outside the multilayer shell tank 1. The first piping 3 used as an air supply pipe is connected to an air supply system outside the multilayer shell tank 1. By switching the gas supply and exhaust of the lower first pipe 3B and the upper first pipe 3U according to the purpose of the gas supply and exhaust process between the tanks 23 and the characteristics of the gas, efficient gas supply and exhaust process can be performed.

[0042] In addition, similar to the first pipe 3, the second pipe 4 includes: a lower second pipe 4B having a second opening 41 disposed in the second inter-tank region 26 at a position lower than the first tank 21; and an upper second pipe 4U having a second opening 41 disposed in the second inter-tank region 26 at a position higher than the first tank 21. The lower second pipe 4B and the upper second pipe 4U can be used as an air supply pipe at the same time. In addition, the lower second pipe 4B and the upper second pipe 4U can be used as an exhaust pipe at the same time. Alternatively, one of the lower second pipe 4B and the upper second pipe 4U can be used as an air supply pipe and the other can be used as an exhaust pipe.

[0043] 〔Summarize〕

[0044] The multilayer shell tank 1 disclosed in the present invention comprises: a first groove 21; a second groove 22, which surrounds the first groove 21; a heat-proof layer 24, which is arranged in the groove 23 between the first groove 21 and the second groove 22 and covers the outer wall of the first groove 21; and a first piping 3 for air supply or exhaust, which has a first opening portion 31 in the first groove area 25 arranged in the groove 23 between the first groove 21 and the heat-proof layer 24, and the first piping 3 passes through the groove 23 and extends to the outside.

[0045] In the multilayer shell tank 1 of the above structure, the first pipe 3 can be used to perform at least one of the supply and exhaust of the first inter-tank area 25. In this way, by actively performing the supply and exhaust of the first inter-tank area 25 between the first tank 21 and the heat-proof layer 24, the supply and exhaust process of the inter-tank 23 can be made efficient.

[0046] The multilayer shell tank 1 of the second item of the present disclosure is based on the multilayer shell tank 1 of the first item, and further includes a support body 71 joined to the outer wall of the first groove 21 in the groove space 23, and the first opening portion 31 is arranged in a narrow portion sandwiched between the first groove 21 and the support body 71.

[0047] The flow of gas tends to stagnate in the narrow portion sandwiched between the first groove 21 and the support body 71 , but the flow of gas is promoted by arranging the first opening 31 in the narrow portion. As a result, the efficiency of the supply and exhaust process between the grooves 23 can be improved.

[0048] The multilayer shell tank 1 according to the third aspect of the present disclosure is the multilayer shell tank 1 according to the first or second aspect, wherein the first pipe 3 has a plurality of first openings 31 distributed around the first groove 21 in the circumferential direction.

[0049] By distributing the plurality of first openings 31 in a dispersed manner, it is possible to make the flow of the supply or exhaust gas to the periphery of the first groove 21 uniform.

[0050] The multilayer shell tank 1 of claim 4 of the present disclosure is the multilayer shell tank 1 of any of claims 1 to 3, wherein the front end portion 3 a of the first pipe 3 including the first opening 31 is supported by the first support member 36 fixed to the outer wall of the first groove 21 .

[0051] By supporting the front end portion 3 a of the first pipe 3 on the outer wall of the first groove 21 in this manner, it is possible to suppress a change in the relative position of the first groove 21 and the first opening 31 when the first groove 21 is thermally contracted.

[0052] A multilayer shell tank 1 according to a fifth aspect of the present disclosure is the multilayer shell tank 1 according to the fourth aspect, wherein the first pipe 3 has an expansion and contraction portion 38 in the groove space 23 .

[0053] Thus, when the tip portion 3 a supported by the first groove 21 and other portions of the first pipe 3 are relatively displaced due to the difference in thermal contraction between the first groove 21 and the second groove 22 , the expansion portion 38 expands and contracts to reduce stress generated in the first pipe 3 .

[0054] A multilayer shell tank 1 according to a sixth aspect of the present disclosure is the multilayer shell tank 1 according to any one of the first to fifth aspects, wherein the first pipe 3 is supported by the second support member 37 fixed to the inner wall of the second groove 22 .

[0055] In this way, the first pipe 3 is laid in the groove space 23 by utilizing the inner wall of the second groove 22 which has a smaller thermal contraction than the first groove 21 , thereby stably supporting the first pipe 3 .

[0056] The multilayer shell tank 1 of item 7 of the present disclosure is based on the multilayer shell tank 1 of any item from items 1 to 6, wherein the first piping 3 has a plurality of first openings 31, and the plurality of first openings 31 include a first opening 31 arranged at a position above the first groove 21 and a first opening 31 arranged at a position below the first groove 21.

[0057] By setting one of the first opening 31 arranged above the first groove 21 and the first opening 31 arranged below the first groove 21 as a gas supply port and the other as an exhaust port, it is possible to efficiently perform gas supply and exhaust processing between the grooves 23. In addition, if the gas supply and exhaust can be switched according to the type of gas supplied or exhausted to the grooves 23 in each of the first opening 31 arranged above the first groove 21 and the first opening 31 arranged below the first groove 21, more efficient gas supply and exhaust processing can be performed.

[0058] The multilayer shell tank 1 of item 8 of the present disclosure is based on the multilayer shell tank 1 of any item from items 1 to 7, and the multilayer shell tank 1 also has a second piping 4 for air supply or exhaust, and the second piping 4 has a second opening portion 41 in the second inter-groove area 26 arranged between the heat protection layer 24 and the second groove 22 in the inter-groove 23, and the second piping 4 extends to the outside through the inter-groove 23.

[0059] By performing gas supply and / or exhaust in the first inter-slot region 25 and the second inter-slot region 26 of the inter-slot 23 , respectively, it is possible to efficiently perform gas supply and exhaust processing in the inter-slot 23 .

[0060] The multilayer shell tank 1 according to claim 9 of the present disclosure is the multilayer shell tank 1 according to claim 8, wherein the first pipe 3 and the second pipe 4 have a converging portion 50 disposed outside.

[0061] Thus, by connecting the first pipe 3 and the second pipe 4 at the junction 50, the pressures of the first inter-tank area 25 and the second inter-tank area 26 can be equalized. In addition, by connecting the first pipe 3 and the second pipe 4 at the junction 50, the gas supply and / or exhaust of the inter-tank area 23 can be performed by one system.

[0062] The above discussion of the present disclosure is presented for the purpose of illustration and description, and is not intended to limit the present disclosure to the methods disclosed in this specification. For example, in the foregoing detailed description, various features of the present disclosure are summarized into one embodiment for the purpose of rationalizing the present disclosure, but several of the multiple features may also be combined. In addition, the multiple features included in the present disclosure may also be combined with alternative embodiments, structures or methods other than those described above.

Claims

1. A multilayer shell tank, comprising: Slot 1; a second groove surrounding the first groove; A heat-proof layer, which is disposed between the first groove and the second groove and covers the outer wall of the first groove; as well as A first pipe for air supply or exhaust has a first opening portion disposed in a first inter-groove region between the first groove and the heat-proof layer in the inter-groove, and extends to the outside through the inter-groove.

2. The multilayer shell tank according to claim 1, wherein: The multilayer shell tank further comprises a support body joined to the outer wall of the first groove between the grooves. The first opening is arranged in a narrow portion sandwiched between the first groove and the support body.

3. The multilayer shell tank according to claim 1 or 2, wherein: The first pipe has a plurality of first openings distributed around the first groove in a circumferential direction.

4. The multilayer shell tank according to any one of claims 1 to 3, wherein: A front end portion of the first pipe including the first opening is supported by a first supporting member fixed to an outer wall of the first groove.

5. The multilayer shell tank according to claim 4, wherein: The first pipe has an expansion and contraction portion between the grooves.

6. The multilayer shell tank according to any one of claims 1 to 5, wherein: The first pipe is supported by a second supporting member fixed to an inner wall of the second groove.

7. The multilayer shell tank according to any one of claims 1 to 6, wherein: The first pipe has a plurality of the first openings, and the plurality of the first openings include the first openings arranged above the first groove and the first openings arranged below the first groove.

8. The multilayer shell tank according to any one of claims 1 to 7, wherein: The multilayer shell tank further includes a second pipe for supplying or exhausting air, the second pipe having a second opening portion disposed in a second inter-groove region between the heat-proof layer and the second groove between the grooves, and the second pipe extends to the outside through the grooves.

9. The multi-layer shell tank according to claim 8, wherein: The first pipe and the second pipe have a joining portion disposed outside.

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