Marine fuel storage system and base structure thereof

Abstract

The utility model provides a marine fuel storage system and a base structure thereof. The base structure is used for achieving connection between a joint of the marine fuel storage system and a fuel tank. The bottom of the base structure is fixedly connected with the top of the fuel tank, the top of the base structure is fixedly connected with the connector, and the connector is located above the fuel tank in a spaced mode, so that the connector is prevented from making direct contact with the fuel tank, cold transfer between the connector and the fuel tank is blocked, and the service life of the fuel tank is prolonged while the using function of the connector is met. The heat preservation requirement of the joint position is lowered, and the structure and the production technological process of the joint position are simplified. The base structure is provided with an operation hole communicated with the interior of the connector position, so that an airtight operation space is defined by the connector position, the base structure and the outer wall of the fuel tank and used for arranging a pipeline assembly and the like of the marine fuel storage system, and the airtight operation space can prevent leakage and diffusion of fuel gas. The reliability and the safety of the marine fuel storage system are improved.

Description

Technical Field

[0001] This utility model relates to the field of fuel storage technology, and in particular to a marine fuel storage system and its base structure. Background Technology

[0002] Ships that use natural gas or methanol as fuel typically have a fuel tank on the deck for storing the natural gas or methanol.

[0003] Currently, a connection point is often installed on marine fuel tanks. Because natural gas or methanol is flammable, explosive, and volatile, this connection point is usually a closed room to provide an airtight installation space for the fuel tank's piping, valves, equipment, and other fuel supply components. The arrangement of the connection point and its connection method with the storage tank are related to the entire fuel system's manufacturing process, use, and safety.

[0004] Existing joints are often directly fixed to the fuel tank, which allows the pressure and temperature inside the tank to be transmitted to the joint structure. This increases the requirements for the strength and insulation of the joint, and raises production costs. Utility Model Content

[0005] The purpose of this utility model is to provide a marine fuel storage system and its base structure. The base structure enables the connection between the joint and the fuel tank of the marine fuel storage system. While meeting the functional requirements of the joint, it reduces the insulation requirements of the joint, simplifies the structure of the joint, simplifies the production process, and reduces production costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] According to one aspect of this application, this application provides a base structure for connecting a joint location of a marine fuel storage system to a fuel tank, the axis of which extends in a horizontal direction;

[0008] The bottom of the base structure is fixedly connected to the top of the fuel tank, and the top of the base structure is fixedly connected to the joint, such that the joint is spaced above the fuel tank.

[0009] The base structure is provided with an operating hole, which communicates with the interior of the connector, so that the connector, the base structure and the outer wall of the fuel tank can be enclosed to form an airtight operating space.

[0010] In some embodiments, the fuel tank includes two tank bodies whose radial sides are connected.

[0011] The base structure includes two base frames and a top plate. The two base frames are arranged in a one-to-one correspondence with the two tanks, and the bottom of each base frame is fixedly connected to the top of the tank.

[0012] The two base frames are spaced apart, and the opposite sides of the two base frames are spaced apart from the two tank bodies at their joints in the width direction of the fuel tank.

[0013] The top plate is located on top of the two base frames, and the joint is fixed to the top of the top plate.

[0014] In some embodiments, each of the base frames includes four side panels that are connected end to end in sequence, and the four side panels enclose a through hole that runs vertically through the frame.

[0015] The top plate is provided with two through holes, each of which communicates with a through hole to form the operating hole.

[0016] In some embodiments, each of the enclosure panels is provided with a plurality of stiffening plates at intervals;

[0017] The top of the stiffening plate is fixed to the top plate.

[0018] In some embodiments, the top plate protrudes outward in the circumferential direction from the outer periphery of the base frame, and the inner diameter of the through hole is smaller than the inner diameter of the through hole;

[0019] Each of the aforementioned enclosure panels has multiple stiffening plates spaced apart on both its inner and outer sides.

[0020] In some embodiments, the top plate includes a connecting portion and an extension portion, the connecting portion being fixed to the top of the two base frames, and the extension portion being located on the outer side of a first side of the two base frames;

[0021] The bottom of the extension is provided with multiple reinforcing plates spaced apart.

[0022] In some embodiments, a plurality of the reinforcing plates are provided in a one-to-one correspondence with a plurality of stiffening plates arranged on the first side of the two base frames;

[0023] Each of the reinforcing plates is fixed to its corresponding stiffening plate; or, each of the reinforcing plates and its corresponding stiffening plate are integrally formed.

[0024] In some embodiments, the bottom of each of the base frames is arc-shaped, and the curvature of the arc is adapted to the outer periphery of the corresponding tank body.

[0025] According to another aspect of this application, a marine fuel storage system is also provided, comprising:

[0026] A fuel tank, the axis of which extends horizontally, is used to store fuel;

[0027] The base structure as described in any of the above, wherein the base structure is disposed on the top of the fuel tank; the base structure is provided with an operating hole;

[0028] The connector is located at the top of the base structure, with the connector positioned above the fuel tank; the interior of the connector communicates with the operating hole, and the connector, the base structure, and the outer wall of the fuel tank enclose an airtight operating space.

[0029] In some embodiments, the base structure is sealed to the fuel tank;

[0030] The joint is sealed to the base structure.

[0031] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0032] In this application, a base structure is used to connect the joint space of the marine fuel storage system to the fuel tank. The operating holes on the base structure communicate with the interior of the joint space, allowing the joint space, base structure, and outer wall of the fuel tank to enclose an airtight operating space for arranging piping components, valves, and various detection devices of the marine fuel storage system. This airtight operating space prevents fuel gas leakage and diffusion, improving the reliability and safety of the marine fuel storage system. Furthermore, this design allows the joint space to be positioned above the fuel tank, preventing direct contact between the joint space and the fuel tank and blocking heat transfer between them. This allows the joint space to meet its functional requirements while reducing insulation requirements, improving safety performance, simplifying its structure, streamlining the manufacturing process, and lowering production costs. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the marine fuel storage system in this embodiment.

[0034] Figure 2 yes Figure 1 Partial structural diagram of the marine fuel storage system along the AA direction.

[0035] Figure 3 yes Figure 1 Side view of the marine fuel storage system along the BB direction.

[0036] Figure 4 yes Figure 3 A partial cross-sectional view of a marine fuel storage system along the CC direction.

[0037] Figure 5 This is a schematic diagram of the base structure in this embodiment.

[0038] Figure 6 This is a bottom view of the base structure in this embodiment.

[0039] The annotations in the attached figures are explained as follows:

[0040] 100. Marine fuel storage system; 1. Fuel tank; 11. Tank body; 12. Manhole cover; 2. Base structure; 21. Operating hole; 22. Base frame; 221. Cofferdam; 221a. First cofferdam; 221b. Second cofferdam; 222. Through hole; 23. Top plate; 231. Through hole; 232. Connection part; 233. Extension part; 24. Rib plate; 25. Reinforcing plate; 3. Joint location. Detailed Implementation

[0041] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0042] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] This application provides a marine fuel storage system for storing fuel.

[0045] The following detailed description, in conjunction with the accompanying drawings, describes specific embodiments of the marine fuel storage system of this application.

[0046] Figure 1 This is a schematic diagram of the marine fuel storage system in this embodiment. Figure 2 for Figure 1 A partial structural diagram of a marine fuel storage system along the AA direction. Figure 3 for Figure 1Side view of the marine fuel storage system along the BB direction. Figure 4 for Figure 3 A partial cross-sectional view of a marine fuel storage system along the CC direction.

[0047] refer to Figures 1-4 The marine fuel storage system 100 includes a fuel tank 1, a base structure 2, and a connection location 3. The fuel tank 1 extends horizontally along its axis and is used to store fuel. The base structure 2 is located on top of the fuel tank 1 and has an operating hole 21. The connection location 3 is located on top of the base structure 2, positioned at a distance above the fuel tank 1. The interior of the connection location 3 communicates with the operating hole 21, and the connection location 3, the base structure 2, and the outer wall of the fuel tank 1 enclose an airtight operating space.

[0048] In this application, the connection between the connector 3 and the fuel tank 1 is achieved through the base structure 2. The operating hole 21 on the base structure 2 can communicate with the interior of the connector 3, so that the connector 3, the base structure 2, and the outer wall of the fuel tank 1 enclose a gas-tight operating space for arranging the piping components, valves, various detection devices, etc. of the marine fuel storage system 100. The gas-tight design of the operating space can prevent the leakage and diffusion of fuel gas, thereby improving the reliability and safety of the marine fuel storage system 100. Furthermore, the above design also allows the connector 3 to be spaced above the fuel tank 1, thus avoiding direct contact between the connector 3 and the fuel tank 1 and blocking the transfer of cold energy between the connector 3 and the fuel tank 1. This allows the connector 3 to meet its functional requirements while reducing the insulation requirements of the connector 3, improving safety performance, simplifying the structure of the connector 3, simplifying the production process, and reducing production costs.

[0049] Furthermore, by fixing the joint 3 above the fuel tank 1 through the base structure 2, the overall length of the marine fuel storage system 100 can be reduced, thereby reducing the space occupied by the marine fuel storage system 100 in the length direction, so as to facilitate the loading and transportation of the marine fuel storage system 100.

[0050] refer to Figures 1-4 The axis of fuel tank 1 extends horizontally, that is, fuel tank 1 in this embodiment is a horizontal tank.

[0051] Fuel tank 1 is hollow inside and used to store fuel. The fuel is mainly injected into fuel tank 1 in a liquid state. For example, the fuel can be LNG. In other embodiments, the fuel can also be methanol, liquid ammonia, etc.

[0052] The fuel tank 1 is equipped with multiple baffles arranged at intervals along its axial direction. Each baffle has a liquid passage for fuel flow. Since the fuel is mainly injected into the fuel tank 1 in a liquid state, the multiple baffles arranged at intervals along the axial direction can divide the interior of the tank into multiple independent chambers. This multi-chamber design disperses the liquid flow load, which can significantly reduce the impact force caused by the inertia of the liquid during transportation, reduce the continuous impact of liquid waves on the inner wall of the fuel tank 1, and reduce the risk of deformation or rupture of the fuel tank 1.

[0053] The fuel tank 1 is equipped with a manhole for the piping system and various detection devices of the marine fuel storage system 100 to pass through, thereby enabling communication between the piping components and the interior of the fuel tank 1. Furthermore, the manhole also allows operators to enter and exit the fuel tank 1 for maintenance, cleaning, and other operations.

[0054] A manhole cover 12 is provided at the manhole. The manhole cover 12 is detachably connected to the fuel tank 1, allowing it to be removed from the fuel tank 1 to open the manhole, or to be installed on the fuel tank 1 to close the manhole. Furthermore, the manhole cover 12 is sealed to the fuel tank 1 to ensure the airtightness of the fuel tank 1. Piping components, various detection devices, etc., can pass through the manhole cover 12 to extend into the fuel tank 1, and are also sealed to the manhole cover 12 to ensure the airtightness of the fuel tank 1.

[0055] In this embodiment, the fuel tank 1 includes two tank bodies 11, whose radial sides are connected and whose interiors are interconnected. This design increases the internal volume of the fuel tank 1, thereby increasing the fuel storage capacity. Furthermore, the straight line containing the centers of the two tank bodies 11 extends horizontally, and the axis of each tank body 11 extends horizontally, with the straight line containing the centers of the two tank bodies 11 perpendicular to the axis of the tank body 11.

[0056] Each tank 11 has a manhole at its top. The manholes on the two tanks 11 are spaced apart along the width of the fuel tank 1. It should be noted that the width of the fuel tank 1 in this article refers to the direction of extension of the straight line connecting the centers of the two tanks 11.

[0057] refer to Figures 1-4 The base structure 2 is located on top of the fuel tank 1. This design can shorten the length of the marine fuel storage system 100. It should be noted that the length of the marine fuel storage system 100 in this article refers to the axial direction of the tank body 11.

[0058] Furthermore, the base structure 2 is sealed to the fuel tank 1 to seal the gap at the connection between the base structure 2 and the fuel tank 1, thereby improving the airtightness of the connection between the base structure 2 and the fuel tank 1.

[0059] Specifically, the base structure 2 and the fuel tank 1 are fixed by welding.

[0060] Figure 5 This is a schematic diagram of the base structure 2 in this embodiment. Figure 6 This is a bottom view of base structure 2.

[0061] refer to Figures 1-6 The base structure 2 is provided with an operating hole 21. After the base structure 2 is fixed to the fuel tank 1, the operating hole 21 corresponds to the manhole of the fuel tank 1 and can communicate with the manhole; that is, the base structure 2 surrounds the outer periphery of the manhole. The inner diameter of the operating hole 21 is larger than the outer diameter of the manhole cover 12, which, while accommodating the manhole cover 12, avoids interference with the manhole cover 12 and facilitates the installation and removal of the manhole cover 12.

[0062] The base structure 2 includes two base frames 22. Each base frame 22 corresponds to one of the two tanks 11, and the bottom of each base frame 22 is fixedly connected to the top of each tank 11. Optionally, the bottom of each base frame 22 is arc-shaped, and the curvature of this arc matches the outer periphery of the corresponding tank 11, allowing the bottom of the base frame 22 to fit snugly against the outer periphery of the tank 11. This reduces the gap between the base frame 22 and the tank 11, facilitating a sealed connection. Specifically, the bottom of each base frame 22 is welded and fixed to the top of the tank 11.

[0063] In this embodiment, the two base frames 22 are spaced apart, and the interfaces between the opposite sides of the two base frames 22 and the two tank bodies 11 are spaced apart in the width direction of the fuel tank 1. Since the interfaces between the two tank bodies 11 have high stress and belong to high stress areas, the above design can avoid fixing the base frames 22 to the interfaces between the two tank bodies 11, thereby avoiding the high stress areas of the fuel tank 1, reducing welding defects and subsequent fatigue fracture risks, and improving the overall structural strength of the base structure 2 and the fuel tank 1.

[0064] Furthermore, each base frame 22 is mirror-symmetrical about the vertical plane containing the axis of the corresponding tank body 11. This balances the pressure exerted by the base frame 22 on both sides of the tank body 11 in the vertical plane, ensuring that the tank body 11 is subjected to uniform force, avoiding local stress concentration or deformation of the tank body 11 due to asymmetrical loads, and enhancing the anti-overturning ability.

[0065] Each base frame 22 protrudes upward from the top of the tank body 11, so that the top surface of each base frame 22 is spaced above the tank body 11.

[0066] Specifically, the base frame 22 includes four sequentially connected end-to-end enclosure plates 221. Each enclosure plate 221 includes two first enclosure plates 221a spaced apart along the axial direction of the tank body 11, and two second enclosure plates 221b spaced apart along the width direction of the fuel tank 1. Both first enclosure plates 221a extend along the width direction of the fuel tank 1, and the bottom of each first enclosure plate 221a is arc-shaped, with the arc conforming to the top of the tank body 11, so that the bottom of the first enclosure plate 221a fits against the top of the tank body 11 and forms a sealed connection. The two second enclosure plates 221b are mirror-symmetrical about the vertical plane containing the corresponding axes of the tank body 11. Each second enclosure plate 221b extends along the axial direction of the tank body 11, and the bottom of each second enclosure plate 221b extends horizontally to facilitate fitting against the tank body 11 and forming a sealed connection.

[0067] Four surrounding panels 221 enclose a through hole 222 that runs vertically through the manhole. The through hole 222 is arranged correspondingly to the manhole and communicates with it. The inner diameter of the through hole 222 is larger than the outer diameter of the manhole cover 12 to avoid interference with the manhole cover 12 and to facilitate the disassembly and assembly of the manhole cover 12.

[0068] Each enclosure panel 221 is provided with multiple stiffening ribs 24 at intervals. Specifically, the stiffening ribs 24 extend vertically and are used to strengthen the structural strength of each enclosure panel 221 and improve the supporting stability of the enclosure panel 221. Furthermore, the stiffening ribs 24 are perpendicular to the enclosure panel 221 and fixedly connected to the enclosure panel 221, which can effectively suppress the deformation of the enclosure panel 221 caused by vibration and impact during transportation or construction, thereby improving the deformation resistance and impact resistance of the enclosure panel 221.

[0069] In this embodiment, multiple stiffening plates 24 are provided at intervals on both the inner and outer sides of each enclosure 221.

[0070] In this embodiment, the base structure 2 further includes a top plate 23, which is disposed on top of the two base frames 22. The top plate 23 extends horizontally. Since the top surfaces of the base frames 22 are spaced above the tank body 11, the top plate 23 fixed to the top of the base frames 22 is also spaced above the tank body 11.

[0071] Specifically, the top plate 23 is provided with two through holes 231, each of which communicates with a through hole 222 to form an operating hole 21. The inner diameter of the through hole 231 is larger than the outer diameter of the manhole cover 12, and the peripheral sidewalls of the through hole 231 are spaced circumferentially outside the manhole cover 12 to fully expose the manhole cover 12 and avoid interference with the manhole cover 12, thus facilitating the disassembly and assembly of the manhole cover 12.

[0072] The top plate 23 is also fixed to the top of the stiffening plate 24. This design allows the stiffening plate 24 to provide support for the top plate 23, which can further improve the stability of the top plate 23.

[0073] The top plate 23 protrudes outward from the outer periphery of the base frame 22 in the circumferential direction. The inner diameter of the top plate 23 is smaller than the inner diameter of the through hole 222, that is, the top plate 23 protrudes inward from the inner side of the base frame 22 in the circumferential direction. The above design allows the top plate 23 to have a larger area while ensuring that it does not interfere with the manhole cover 12. Furthermore, the above design allows the top plate 23 to be fixed to each of the surrounding plates 221, while also facilitating the fixed connection of the stiffening plates 24 located on the inner and outer sides of each surrounding plate 221 to the top plate 23. This increases the contact area between the overall structure formed by the stiffening plates 24 and the surrounding plates 221 and the top plate 23, thereby further improving the stability of the top plate 23.

[0074] Exemplarily, the top plate 23 includes a connecting portion 232 and an extension portion 233. The connecting portion 232 is fixed to the top of the two base frames 22. The extension portion 233 protrudes from a first side of the base frame 22 along the length direction of the fuel tank 1. That is, the extension portion 233 is located on the outer side of one of the first enclosure plates 221a of the base frame 22. The provision of the extension portion 233 can effectively increase the surface area of ​​the top plate 23.

[0075] The bottom of the extension 233 is provided with multiple reinforcing plates 25 at intervals. Specifically, the multiple reinforcing plates 25 are arranged at intervals along the width direction of the fuel tank 1, and each reinforcing plate 25 extends along the length direction of the fuel tank 1. The reinforcing plates 25 are used to strengthen the structural strength of the top plate 23 and improve the supporting stability of the top plate 23. Furthermore, the reinforcing plates 25 are perpendicular to the top plate 23 and fixedly connected to the top plate 23. This can effectively suppress the deformation of the top plate 23 caused by vibration and impact during transportation or construction, thereby improving the deformation resistance and impact resistance of the top plate 23.

[0076] In this embodiment, multiple reinforcing plates 25 are correspondingly arranged one-to-one with multiple stiffening plates 24 arranged on the first side of the two base frames 22. Each reinforcing plate 25 is fixed to its corresponding stiffening plate 24, or each reinforcing plate 25 can be integrally formed with its corresponding stiffening plate 24. This design allows the stiffening plate 24 to support the corresponding reinforcing plate 25, thereby enabling the reinforcing plate 25 to support the extension 233, without the need for additional structures such as columns to be fixed between the fuel tank 1 and the top plate 23 to support the top plate 23. This reduces the number of connection points on the fuel tank 1 and reduces stress concentration areas on the fuel tank 1, ensuring that the fuel tank 1 has high structural strength.

[0077] The bottom of the reinforcing plate 25 is rounded to the outer side of the corresponding stiffener 24, which can disperse the stress at the junction of the reinforcing plate 25 and the stiffener 24 to a certain extent, so as to avoid stress concentration at the junction of the reinforcing plate 25 and the stiffener 24, thereby improving the reliability and fatigue resistance of the overall structure composed of the reinforcing plate 25 and the stiffener 24.

[0078] refer to Figures 1-4 The connector 3 is located on top of the base structure 2, positioned above the fuel tank 1. This avoids direct contact between the connector 3 and the fuel tank 1, preventing heat transfer between them. This eliminates the need for additional insulation on the connector 3 while still fulfilling its functional requirements, reducing insulation demands, improving safety, simplifying its structure, streamlining the production process, and lowering costs. Furthermore, the location of the connector 3 and base structure 2 on top of the fuel tank 1 reduces the overall length of the marine fuel storage system 100, thus minimizing its length and facilitating easier packing and transport.

[0079] Specifically, the connector 3 is fixed to the top plate 23. Since the top plate 23 is spaced above the tank body 11, the connector 3 can be spaced above the fuel tank 1.

[0080] Furthermore, the joint 3 is sealed to the base structure 2 to seal the gap at the connection between the base structure 2 and the joint 3, thereby improving the airtightness of the connection between the base structure 2 and the joint 3.

[0081] Specifically, the joint 3 is welded and fixed to the base structure 2.

[0082] The interior of the connector 3 communicates with the operating port 21. The connector 3, the base structure 2, and the outer wall of the fuel tank 1 enclose an operating space, which is used to arrange pipeline components, valves, and various detection devices. Since the connector 3 and the base structure 2, as well as the base structure 2 and the fuel tank 1, are all sealed, the operating space enclosed by the connector 3, the base structure 2, and the outer wall of the fuel tank 1 is an airtight space. This prevents fuel gas from leaking and diffusing to the outside, thereby improving the reliability and safety of the marine fuel storage system 100.

[0083] Specifically, the joint location 3 is open at the bottom and hollow inside. The bottom of the peripheral sidewall of the joint location 3 directly contacts the top plate 23 and is fixed and sealed. That is, the joint location 3 can use the entire top surface of the top plate 23 as its bottom wall, and at the same time, the entire top surface of the top plate 23 can be used as a passage for operators to walk through. This simplifies the structure of the joint location 3, simplifies the production process, and reduces production costs.

[0084] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0085] In this application, a base structure is used to connect the joint space of the marine fuel storage system to the fuel tank. The operating holes on the base structure communicate with the interior of the joint space, allowing the joint space, base structure, and outer wall of the fuel tank to enclose an airtight operating space for arranging piping components, valves, and various detection devices of the marine fuel storage system. This airtight operating space prevents fuel gas leakage and diffusion, improving the reliability and safety of the marine fuel storage system. Furthermore, this design allows the joint space to be positioned above the fuel tank, preventing direct contact between the joint space and the fuel tank and blocking heat transfer between them. This allows the joint space to meet its functional requirements while reducing insulation requirements, improving safety performance, simplifying its structure, streamlining the manufacturing process, and lowering production costs.

[0086] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A base structure, characterized in that, This is used to connect the joint of a marine fuel storage system to a fuel tank, the axis of which extends horizontally. The bottom of the base structure is fixedly connected to the top of the fuel tank, and the top of the base structure is fixedly connected to the joint, such that the joint is spaced above the fuel tank. The base structure is provided with an operating hole, which communicates with the interior of the connector, so that the connector, the base structure and the outer wall of the fuel tank can be enclosed to form an airtight operating space.

2. The base structure according to claim 1, characterized in that, The fuel tank includes two tank bodies, and the radial sides of the two tank bodies are connected. The base structure includes two base frames and a top plate. The two base frames are arranged in a one-to-one correspondence with the two tanks, and the bottom of each base frame is fixedly connected to the top of the tank. The two base frames are spaced apart, and the opposite sides of the two base frames are spaced apart from the two tank bodies at their joints in the width direction of the fuel tank. The top plate is located on top of the two base frames, and the joint is fixed to the top of the top plate.

3. The base structure according to claim 2, characterized in that, Each of the base frames includes four side panels that are connected end to end in sequence, and the four side panels enclose a through hole that runs vertically through the frame. The top plate is provided with two through holes, each of which communicates with a through hole to form the operating hole.

4. The base structure according to claim 3, characterized in that, Each of the aforementioned enclosure panels is provided with multiple stiffening plates spaced apart; The top of the stiffening plate is fixed to the top plate.

5. The base structure according to claim 4, characterized in that, The top plate protrudes outward from the outer periphery of the base frame in the circumferential direction, and the inner diameter of the through hole is smaller than the inner diameter of the through hole; Each of the aforementioned enclosure panels has multiple stiffening plates spaced apart on both its inner and outer sides.

6. The base structure according to claim 4, characterized in that, The top plate includes a connecting part and an extension part, the connecting part is fixed to the top of the two base frames, and the extension part is located on the outer side of the first side of the two base frames; The bottom of the extension is provided with multiple reinforcing plates spaced apart.

7. The base structure according to claim 6, characterized in that, The multiple reinforcing plates are provided in a one-to-one correspondence with the multiple stiffening plates arranged on the first side of the two base frames; Each of the reinforcing plates is fixed to its corresponding stiffening plate; or, each of the reinforcing plates and its corresponding stiffening plate are integrally formed.

8. The base structure according to claim 2, characterized in that, The bottom of each of the base frames is arc-shaped, and the curvature of the arc is adapted to the outer periphery of the corresponding tank body.

9. A marine fuel storage system, characterized in that, include: A fuel tank, the axis of which extends horizontally, is used to store fuel; The base structure as described in any one of claims 1 to 8, wherein the base structure is disposed on the top of the fuel tank; and the base structure is provided with an operating hole; The connector is located at the top of the base structure, with the connector positioned above the fuel tank; the interior of the connector communicates with the operating hole, and the connector, the base structure, and the outer wall of the fuel tank enclose an airtight operating space.

10. The marine fuel storage system according to claim 9, characterized in that, The base structure is sealed to the fuel tank; The joint is sealed to the base structure.

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