Sealed and insulated storage tank for storing a fluid

Abstract

The application discloses a sealed and heat-insulated storage tank for storing fluid, which comprises a secondary heat-insulating layer, a secondary sealing film, a primary heat-insulating layer and a primary sealing film arranged in sequence, the primary heat-insulating layer is composed of a primary heat-insulating box, and the secondary heat-insulating layer is composed of a secondary heat-insulating box; the primary sealing film is composed of a primary corrugated plate, and the secondary sealing film is composed of a secondary corrugated plate; the primary corrugated plate and the secondary corrugated plate comprise corrugations in a first direction and corrugations in a second direction; the corrugations in the first direction of the primary corrugated plate are arranged at a pitch L1, and the corrugations in the second direction are arranged at a pitch L2; the corrugations in the first direction of the secondary corrugated plate are arranged at a pitch L3, and the corrugations in the second direction are arranged at a pitch L4; L3 is greater than L1, and / or L4 is greater than L2. By increasing the pitch of the corrugations of the secondary sealing film, the number of grooves arranged on the secondary heat-insulating layer is reduced, the structural strength of the heat-insulating layer is effectively improved, the cracking risk is reduced, the service life of the storage tank is prolonged, and the application is suitable for low-temperature liquid cargo storage on land-based facilities and marine equipment such as ships.

Description

Technical Field

[0001] This invention relates to the field of storage tank technology, and more specifically to a sealed and insulated storage tank for storing fluids. Background Technology

[0002] Sealed and insulated storage tanks are widely used in various industrial settings for storing high-temperature or low-temperature products. These tanks can be used in land-based facilities, such as liquefied natural gas receiving terminals, chemical plants, and cold storage warehouses, as well as on marine equipment such as ships for long-distance transportation of cryogenic liquid cargoes such as liquefied natural gas (LNG), liquid nitrogen, and liquid ammonia. Furthermore, in industries such as aerospace, medical, and electronics, these tanks are also commonly used to store special cryogenic media such as liquid hydrogen and liquid oxygen.

[0003] In existing technologies, sealed and insulated storage tanks typically include an insulation layer and a sealing layer. The insulation layer, composed of multiple insulating boxes, serves to insulate the tank, reducing the transfer of external heat into the tank and the loss of internal cold air. The sealing layer, which directly contacts the cryogenic liquid, is usually made of metal plates with good low-temperature toughness and corrosion resistance. To improve the structure's adaptability to thermal expansion and contraction, the metal plates are often machined with regularly arranged corrugations. These corrugations provide allowance for expansion and contraction caused by temperature changes, preventing the sealing layer from cracking or leaking due to excessive thermal stress.

[0004] In large cryogenic storage tanks, especially in LNG carrier containment systems, a double-sealed, double-insulated containment structure is typically used to ensure safety. This involves sequentially installing a secondary insulation layer, a secondary sealing membrane, a primary insulation layer, and a primary sealing membrane. The primary sealing membrane directly contacts the cryogenic liquid cargo inside the tank, while the secondary sealing membrane serves as a second line of defense. In actual design, manufacturing, installation, and use, the corrugations on both the primary and secondary sealing membranes are usually positioned either facing outwards or inwards simultaneously, and the corrugation spacing on the primary and secondary corrugated plates is equal.

[0005] When the corrugations face outwards from the tank, multiple grooves need to be created on both the main and secondary insulation layers to accommodate the corrugated portions of the main and secondary sealing membranes. Since both the main and secondary insulation layers are assembled from multiple insulation boxes, creating numerous grooves significantly weakens their structural strength. Specifically, the presence of grooves disrupts the continuity and integrity of the insulation layer. Under conditions of swaying loads during ship navigation, fluctuations in injection and discharge pressure, and thermal stress caused by temperature changes, stress concentration easily occurs at the edges and near the grooves, leading to damage such as cracking of the polyurethane blocks and breakage of the plywood. This decrease in insulation strength not only affects its pressure-bearing capacity and insulation effect but may also cause a series of problems, including uneven support of the sealing membrane and increased deformation of the corrugated plates, ultimately impacting the safety and service life of the entire storage tank.

[0006] Therefore, there is an urgent need to provide a sealed and insulated storage tank that can overcome the above-mentioned shortcomings, reduce the adverse effects on the strength of the insulation layer while ensuring the normal expansion and contraction function of the corrugated plate, and improve the durability and reliability of the storage tank. Summary of the Invention

[0007] To at least solve the above-mentioned technical problems, the present invention provides 1. a sealed and heat-insulated storage tank for storing fluid, the storage tank comprising a tank wall fixed to a flat support wall, the tank wall comprising, in the thickness direction, a secondary insulation layer, a secondary sealing membrane, a primary insulation layer and a primary sealing membrane, the primary sealing membrane being in contact with the fluid inside the storage tank;

[0008] The main insulation layer is composed of multiple side-by-side main insulation boxes, and the secondary insulation layer is composed of multiple side-by-side secondary insulation boxes.

[0009] The main sealing membrane is composed of multiple main corrugated plates tightly connected to each other, and the secondary sealing membrane is composed of multiple secondary corrugated plates tightly connected to each other;

[0010] The main corrugated plate and the secondary corrugated plate include corrugations in a first direction and corrugations in a second direction, wherein the first direction and the second direction are perpendicular.

[0011] The distance between two adjacent corrugations in the first direction of the main corrugated plate is set as L1, and the distance between two adjacent corrugations in the second direction is set as L2.

[0012] The distance between two adjacent corrugations in the first direction of the secondary corrugated plate is set as L3, and the distance between two adjacent corrugations in the second direction is set as L4.

[0013] L3 is greater than L1.

[0014] And / or,

[0015] L4 is greater than L2.

[0016] Preferably, the ratio of L3 to L1 is 3:2, and the ratio of L4 to L2 is 3:2.

[0017] Preferably, in the first direction, the size of the secondary insulation box is larger than the size of the primary insulation box;

[0018] And / or,

[0019] In the second direction, the size of the secondary insulation box is larger than the size of the primary insulation box.

[0020] Preferably, in the first direction, the ratio of the size of the secondary insulation box to the size of the primary insulation box is 2:1;

[0021] And / or,

[0022] In the second direction, the ratio of the size of the secondary insulation box to the size of the primary insulation box is 2:1.

[0023] Preferably, the corrugations on the main corrugated plate are arranged facing the inside of the storage tank.

[0024] Preferably, some of the corrugations on the main corrugated plate correspond to the gap between the main insulation box;

[0025] The corrugations on the secondary corrugated plate correspond to the gap between the secondary insulation box and the corrugated plate.

[0026] Preferably, the secondary corrugated plate includes a main body portion and an edge portion disposed around the main body portion, the edge portion being used to connect with the edge portion of another corrugated plate;

[0027] The corrugations have recessed portions and protruding portions. The recessed portions are disposed on the main body portion, and the protruding portions are disposed on the edge portion. The recessed portions are disposed toward the secondary insulation box, and the protruding portions are used to connect with the protruding portions of another secondary corrugated plate.

[0028] Preferably, the main insulation box has a first receiving groove on its surface facing the outside of the storage tank for accommodating the corrugated protrusions on the secondary corrugated plate;

[0029] The secondary insulation box has a second receiving groove on its surface facing the inside of the storage tank, which is used to receive the corrugated recess on the secondary corrugation.

[0030] Preferably, the thickness of the main insulation box and the secondary insulation box is 150 mm to 250 mm.

[0031] Preferably, the main insulation box and / or the secondary insulation box includes an upper support plate, a lower support plate, and insulation material sandwiched between the upper support plate and the lower support plate.

[0032] Preferably, the main insulation box and / or the secondary insulation box are further provided with one or more reinforcing layers between the upper support plate and the lower support plate;

[0033] The reinforcing layer is made of one or more of the following materials: plywood, fiberglass cloth, or aluminum foil.

[0034] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0035] 1. This invention sets the corrugations of the main sealing membrane to face inwards towards the tank, eliminating the need for any grooves on the surface of the main insulation layer facing the tank interior to accommodate the corrugations. This preserves the structural continuity of the main insulation layer and avoids stress concentration and strength reduction caused by grooving. Simultaneously, the increased corrugation spacing of the secondary sealing membrane reduces the number of corrugations on the same area, thus reducing the number of grooves required on the secondary insulation layer. This design significantly reduces the weakening effect of grooving on the insulation layer, effectively minimizing the risk of cracking and damage during use and extending the service life of the storage tank.

[0036] 2. In this invention, the size of the secondary insulation box is larger than that of the main insulation box. A larger insulation box means fewer splicing seams, which not only improves the integrity and shear resistance of the insulation layer, but also significantly reduces the installation steps and splicing workload on the construction site. This helps to shorten the tank construction cycle, reduce labor costs, and also helps to improve the uniformity and sealing of the insulation layer.

[0037] 3. A key design concept of this invention is optimization based on the differences in thermal shrinkage between different layers. The main sealing membrane is in direct contact with the cryogenic liquid cargo inside the tank, such as LNG, with a temperature of approximately -160°C. The main sealing membrane is subjected to a severe low-temperature environment, resulting in significant thermal shrinkage and requiring a denser corrugation spacing, i.e., a smaller first corrugation interval, to provide sufficient expansion and contraction margin. The secondary sealing membrane and secondary insulation layer, located outside the main insulation layer and farther from the tank interior, experience a lower degree of low temperature due to the temperature gradient, resulting in relatively smaller thermal shrinkage. Therefore, increasing the corrugation spacing of the secondary sealing membrane not only does not affect its normal function during thermal expansion and contraction but also matches the actual temperature distribution and shrinkage requirements, achieving a high degree of unity between structural design and physical laws. This differentiated design based on thermodynamic principles maximizes the structural strength of the insulation layer while ensuring the safety of the sealing membrane. Attached Figure Description

[0038] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0039] Figure 1 This is a partial cross-sectional schematic diagram of the wall of a sealed and insulated storage tank for storing fluid according to a preferred embodiment of the present invention, showing the stacked structure of the tank wall.

[0040] Figure 2This is a partial perspective view of the wall of a sealed and insulated storage tank for storing fluids according to a preferred embodiment of the present invention.

[0041] Figure 3 This is a three-dimensional schematic diagram of the main corrugated plate according to a preferred embodiment of the present invention;

[0042] Figure 4 This is a three-dimensional schematic diagram of a secondary corrugated plate according to a preferred embodiment of the present invention;

[0043] Figure 5 This is a three-dimensional schematic diagram of the main insulation box according to a preferred embodiment of the present invention;

[0044] Figure 6 This is a three-dimensional schematic diagram of a secondary insulation box according to a preferred embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of an insulation box according to a preferred embodiment of the present invention, showing the upper and lower support plates and the reinforcing layer of the insulation box.

[0046] Explanation of reference numerals in the attached figures:

[0047] 110 Support wall;

[0048] 120 layers of insulation;

[0049] 130 sealing films;

[0050] 140 Main insulation layer;

[0051] 150 main sealing membrane;

[0052] 400 main insulation box;

[0053] 500 cycles of insulation chamber;

[0054] 200 main corrugated plate;

[0055] 300-cycle corrugated board;

[0056] 301 Main body;

[0057] 302 Edge portion;

[0058] 311. Depression;

[0059] 312 Protrusion;

[0060] 430 First receiving tank;

[0061] 520 Second receiving tank;

[0062] 410 Upper support plate;

[0063] 420 Lower support plate;

[0064] 600 thermal insulation material;

[0065] 450 reinforcement layer. Detailed Implementation

[0066] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0067] In the description of this invention, it should be understood that the terms "inner," "outer," "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and do not indicate or imply that the device or element referred to must have a specific orientation. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] like Figure 1 As shown, a sealed and insulated storage tank for storing fluids according to an embodiment of the present invention includes a tank wall fixed to a flat support wall 110. The support wall 110 can be the inner hull of a ship, the foundation wall of a land-based storage tank, or other load-bearing structures. The tank wall, in its thickness direction from the outside to the inside, includes a secondary insulation layer 120, a secondary sealing membrane 130, a primary insulation layer 140, and a primary sealing membrane 150. The primary sealing membrane 150 is in direct contact with the fluid inside the tank, such as liquefied natural gas, liquid nitrogen, liquid ammonia, or other cryogenic liquid cargoes. The secondary sealing membrane 130 serves as a second line of defense. The primary insulation layer 140 and the secondary insulation layer 120 respectively support the corresponding sealing membranes and provide insulation, reducing the transfer of external heat into the tank or the loss of internal cold energy.

[0069] The main sealing membrane 150 is formed by welding multiple main corrugated plates 200 together tightly. Similarly, the secondary sealing membrane 130 is formed by welding multiple secondary corrugated plates 300 together tightly. These corrugated plates are preferably made of materials with good low-temperature toughness and corrosion resistance, such as austenitic stainless steel.

[0070] The insulation layer is composed of multiple insulation boxes arranged side by side. Specifically, the main insulation layer 140 is composed of multiple main insulation boxes 400 arranged side by side, and the secondary insulation layer 120 is composed of multiple secondary insulation boxes 500 arranged side by side.

[0071] Reference Figures 2 to 4The expansion and contraction allowance required for thermal expansion and contraction is obtained by pressing regularly arranged straight corrugations onto the surface of each corrugated plate. Specifically, the main corrugated plate 200 has corrugations in a first direction and a second direction, which are perpendicular to each other. The distance between two adjacent corrugations in the first direction is L1, and the distance between two adjacent corrugations in the second direction is L2. The secondary corrugated plate 300 also has corrugations in the first direction and a second direction. The distance between two adjacent corrugations in the first direction is L3, and the distance between two adjacent corrugations in the second direction is L4. L3 is greater than L1, and L4 is greater than L2, that is, the corrugation spacing in the two directions on the secondary corrugated plate 300 is greater than the corrugation spacing in the two directions on the main corrugated plate 200.

[0072] In a preferred embodiment, the ratio of L3 to L1 is 3:2, or the ratio of L4 to L2 is 3:2. In other words, the corrugation spacing on the secondary corrugated plate 300 is 50% larger than the corrugation spacing on the primary corrugated plate 200. This ratio is determined based on differences in thermal shrinkage and structural strength optimization.

[0073] More preferably, L1 and L2 are 400 mm, and L3 and L4 are 600 mm. The ratio of 400 mm to 600 mm is 2:3. This size is suitable for large LNG carriers or large land-based storage tanks. The main sealing membrane 150 is in direct contact with the cryogenic liquid cargo at -163°C, requiring denser corrugations to accommodate severe thermal contraction; while the secondary sealing membrane 130 is farther from the cold source, and the temperature gradient causes it to actually withstand a lower temperature, so a larger spacing of 600 mm can still ensure sufficient expansion and contraction margin.

[0074] Because the corrugation spacing on the secondary corrugated plate 300 is increased, the number of corrugations on the secondary corrugated plate 300 is reduced for the same area. Therefore, the number of corresponding grooves that need to be opened on the secondary insulation box 500 is also reduced accordingly. This design significantly reduces the weakening effect of the grooves on the insulation layer, effectively reduces the risk of cracking and damage to the insulation layer during use, and extends the service life of the storage tank.

[0075] In another preferred embodiment, L1 and L2 are 200 mm, and L3 and L4 are 300 mm. This size is suitable for medium-sized storage tanks or applications requiring higher corrugation density. The ratio of 200 mm to 300 mm is also maintained at 2:3. Denser corrugations provide better flexibility and stress dispersion, suitable for environments with severe sloshing of liquids. Similarly, because the corrugation spacing on the secondary corrugated plate 300 is greater than that on the primary corrugated plate 200, the number of corrugations on the secondary corrugated plate 300 is reduced for the same area. Therefore, the number of corresponding grooves that need to be opened on the secondary insulation box 500 is also reduced, thereby improving the strength of the insulation layer.

[0076] like Figure 2As shown, the size of the secondary insulation box 500 is larger than that of the main insulation box. Specifically, the main insulation box 400 and the secondary insulation box 500 have the same size in the second direction, which is 1.2 meters. Meanwhile, the main insulation box 400 has a size of 1.2 meters in the first direction, while the secondary insulation box 500 has a size of 2.4 meters in the first direction. The increased size of the secondary insulation box can reduce the number of gaps between insulation boxes, thereby enhancing the heat insulation effect of the insulation layer and improving the overall structural strength of the insulation box.

[0077] The thickness of the main insulation box 400 and the secondary insulation box 500, i.e., the dimension in the tank wall thickness direction, is 150 mm to 250 mm. The thickness of the main insulation box 400 is preferably 150 mm, and the thickness of the secondary insulation box 500 is preferably 250 mm. This thickness range has been experimentally verified to achieve a good balance between insulation performance and structural strength. For applications requiring higher insulation performance, a thicker box can be selected; for applications with limited space or weight sensitivity, a thinner box can be selected. Those skilled in the art can adjust the thickness according to actual needs; the thickness range is not limited to 150 mm to 250 mm, and can be thinner or thicker.

[0078] like Figure 7 As shown, the insulation box includes an upper support plate 410, a lower support plate 420, and insulation material 600. The insulation material 600 is sandwiched between the upper support plate 410 and the lower support plate 420. The upper support plate 410 and the lower support plate 420 are made of plywood, while the insulation material 600 can be made of polyurethane foam blocks, or foamed materials such as phenolic foam or polyisocyanurate. Furthermore, one or more reinforcing layers 450 can be provided between the upper support plate 410 and the lower support plate 420. The reinforcing layer 450 can be plywood, aluminum foil, fiberglass cloth, or other reinforcing materials. Alternatively, advanced insulation materials 600 such as vacuum insulation panels or aerogel can be used as the core layer, with an outer layer of plywood or fiberglass reinforced plastic. This multi-layer composite structure, while ensuring insulation performance, improves the overall rigidity and fatigue resistance of the insulation box, enabling it to better withstand long-term dynamic loads during ship navigation.

[0079] like Figure 2 As shown, the corrugations of the main corrugated plate 200 face inwards towards the inside of the storage tank. The advantage of this design is that the surface supporting the main corrugated plate 200 in the main insulation box 400 is a flat plane, eliminating the need for any grooves to accommodate the corrugations. Therefore, the structural integrity of the main insulation layer 140 is preserved, and its compressive strength and crack resistance are significantly higher than those of insulation layers in the prior art that require extensive slotting.

[0080] like Figure 4As shown, the secondary corrugated plate 300 includes a main body portion 301 and an edge portion 302 surrounding the main body portion 301. The edge portion 302 is used for welding connection with the edge portion 302 of another adjacent corrugated plate. Each corrugation on the secondary corrugated plate 300 has a recess 311 and a protrusion 312. Specifically, the recess 311 is provided on the main body portion 301, facing towards the secondary insulation box 500, i.e., recessed outward; the protrusion 312 is provided on the edge portion 302, for mating with the protrusion 312 of another corrugated plate. Welding the two protrusions 312 side by side can obtain a smooth and high-strength weld.

[0081] To accommodate the aforementioned corrugated structure, corresponding receiving grooves are provided on the main insulation layer 140 and the secondary insulation layer 120. For example... Figure 5 As shown, a first receiving groove 430 is formed on the surface of the main insulation box 400 facing the secondary sealing membrane 130 to receive the corrugated protrusion 312 on the secondary corrugated plate 300. Figure 6 As shown, a second receiving groove 520 is provided on the surface of the secondary insulation box 500 facing the secondary sealing membrane 130 to receive the corrugated recesses 311 on the secondary corrugated plate 300. By rationally designing the number and position of the receiving grooves, it can be ensured that each corrugated recess 311 is precisely supported.

[0082] In a preferred embodiment, a portion of the corrugations on the main corrugated plate 200 and the secondary corrugated plate 300 may correspond to the gaps in the insulation box.

[0083] The above description is based on several preferred embodiments, but the present invention is not limited to these specific structures. For example, the first corrugation spacing is not limited to 400 mm or 200 mm, and the second corrugation spacing is not limited to 600 mm or 300 mm. For larger storage tanks, a combination of 800 mm and 1200 mm can be used; for smaller storage tanks, a combination of 100 mm and 150 mm can be used.

[0084] The size of the insulation panel can be adjusted according to the corrugation spacing and the actual size of the storage tank. For example, the size of the main insulation box 400 in the first direction can be 3, 6, or 9 times the corrugation spacing, and the corresponding size of the secondary insulation box 500 can be 2, 4, or 6 times.

[0085] It should be understood that the above description of various embodiments of the present invention is provided for illustrative purposes to a person of ordinary skill in the art. It is not intended to exclude or limit the invention to a single disclosed embodiment. As taught above, those skilled in the art will understand that various alternatives and variations of the invention are possible. Therefore, although some alternative embodiments have been specifically described, those skilled in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all alternatives, modifications, and variations of the invention described herein, as well as other embodiments falling within the spirit and scope of the invention described above.

Claims

1. A sealed and insulated storage tank for storing fluids, characterized in that, The storage tank includes a tank wall fixed to a flat support wall (110), the tank wall including, in the thickness direction, a secondary insulation layer (120), a secondary sealing membrane (130), a primary insulation layer (140) and a primary sealing membrane (150), the primary sealing membrane (150) being in contact with the fluid inside the storage tank; The main insulation layer (140) is composed of multiple side-by-side main insulation boxes (400), and the secondary insulation layer (120) is composed of multiple side-by-side secondary insulation boxes (500). The main sealing membrane (150) is composed of multiple main corrugated plates (200) tightly connected to each other, and the secondary sealing membrane (130) is composed of multiple secondary corrugated plates (300) tightly connected to each other; The main corrugated plate (200) and the secondary corrugated plate (300) include corrugations in a first direction and corrugations in a second direction, wherein the first direction and the second direction are perpendicular. The distance between two adjacent corrugations in the first direction of the main corrugated plate (200) is set as L1, and the distance between two adjacent corrugations in the second direction is set as L2. The distance between two adjacent corrugations in the first direction of the secondary corrugated plate (300) is set as L3, and the distance between two adjacent corrugations in the second direction is set as L4. The ratio of L3:L1 is 3:2, and the ratio of L4:L2 is 3:2; In the first direction, the size of the secondary insulation box (500) is larger than the size of the primary insulation box (400); and / or, in the second direction, the size of the secondary insulation box (500) is larger than the size of the primary insulation box (400).

2. The sealed and insulated storage tank for storing fluids according to claim 1, characterized in that, In the first direction, the ratio of the size of the secondary insulation box (500) to the size of the primary insulation box (400) is 2:1; And / or, In the second direction, the ratio of the size of the secondary insulation box (500) to the size of the primary insulation box (400) is 2:

1.

3. The sealed and insulated storage tank for storing fluids according to claim 1, characterized in that, The corrugations on the main corrugated plate (200) are arranged facing the inside of the storage tank.

4. The sealed and insulated storage tank for storing fluids according to claim 1, characterized in that, The corrugations on the main corrugated plate (200) correspond to the gap between the main insulation box (400); The corrugations on the secondary corrugated plate (300) correspond to the gap between the secondary insulation box (500).

5. The sealed and insulated storage tank for storing fluids according to claim 1, characterized in that, The secondary corrugated plate (300) includes a main body portion (301) and an edge portion (302) disposed around the main body portion (301), the edge portion (302) being used to connect with the edge portion (302) of another corrugated plate; The corrugation has a recess (311) and a protrusion (312), the recess (311) being disposed on the main body portion (301), the protrusion (312) being disposed on the edge portion (302), the recess (311) being disposed toward the secondary insulation box (500), and the protrusion (312) being used to connect with the protrusion (312) of another secondary corrugated plate (300).

6. The sealed and insulated storage tank for storing fluids according to claim 5, characterized in that, The main insulation box (400) has a first receiving groove (430) on its surface facing the outside of the storage tank to receive the corrugated protrusion (312) on the secondary corrugated plate (300); the secondary insulation box (500) has a second receiving groove (520) on its surface facing the inside of the storage tank to receive the corrugated recess (311) on the secondary corrugated plate.

7. The sealed and insulated storage tank for storing fluids according to claim 1, characterized in that, The thickness of the main insulation box (400) and the secondary insulation box (500) is 150 mm to 250 mm.

8. The sealed and insulated storage tank for storing fluids according to claim 1, characterized in that, The main insulation box (400) and / or the secondary insulation box (500) include an upper support plate (410), a lower support plate (420), and insulation material (600) sandwiched between the upper support plate (410) and the lower support plate (420).

9. The sealed and insulated storage tank for storing fluids according to claim 8, characterized in that, The main insulation box (400) and / or the secondary insulation box (500) are provided with one or more reinforcing layers (450) between the upper support plate (410) and the lower support plate (420). The reinforcing layer (450) is made of one or more of the following materials: plywood, fiberglass cloth, or aluminum foil.

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