Floating roof and oil storage tank using the same

Abstract

The application aims to provide a floating roof and an oil storage tank using the same to solve the technical problems of rust and corrosion of the floating roof of the floating roof type oil storage tank in the oil storage process, complicated maintenance and high maintenance cost. The oil storage tank comprises a tank body and a floating roof arranged in the tank body. The floating roof is made of non-metallic material and comprises a main body core layer. An upper portion of the main body core layer is provided with a fire-retardant layer. The fire-retardant layer comprises a fire retardant and is used for preventing the oil liquid from being ignited by an external open flame. A lower portion of the main body core layer is sequentially provided with an isolation layer and an anti-static layer. The isolation layer is provided with resin to prevent the oil liquid in the oil tank from penetrating into the main body core layer. The anti-static layer is provided with graphite or carbon black to lead out static electricity generated by the oil liquid in the oil storage tank. The anti-static layer is grounded through a wire.

Description

Technical Field

[0001] This invention relates to the field of petroleum storage technology, specifically to a floating roof and an oil storage tank using the floating roof. Background Technology

[0002] Oil storage is typically accomplished using oil storage tanks. Existing oil storage tanks are generally cylindrical structures, including the tank body and a sealed top cover. Top covers are divided into fixed top covers (fixed covers) and floating top covers (floating roofs) that move up and down within the tank depending on the amount of oil in the tank. The floating roof is a disc-shaped structure made of welded metal materials. Both the upper and lower surfaces of the floating roof are coated with anti-corrosion and anti-rust paint, while the lower surface is coated with an anti-static paint in addition to the anti-corrosion and anti-rust paint. The sides of the floating roof have buoyancy chambers to overcome the weight of the metal floating roof, allowing it to float above the oil surface in the tank. To prevent the floating roof from rotating on the liquid surface, guide holes are provided on the floating roof, and anti-rotation columns that can be inserted into the guide holes are located on the inner wall of the tank. For easy maintenance and leveling of the floating roof, multiple height-adjustable support feet are installed at the bottom of the tank. The floating roof also has sampling ports for oil sampling and breather valves to reduce the pressure inside the tank cavity. When a floating roof is installed within the tank, an annular gap exists between the floating roof and the inner wall of the tank. To ensure the overall airtightness of the oil storage tank, a sealing device is installed within this annular gap. This sealing device is typically a soft-seal structure primarily composed of rubber sealing strips. The sealing device isolates the oil inside the tank from the outside as the floating roof moves up and down, significantly reducing evaporation losses during storage and preventing contamination and deterioration. Oil storage tanks using floating roofs can reduce oil loss by approximately 80% compared to fixed-roof tanks.

[0003] However, existing floating roof oil tanks have several problems during use. Because the floating roof is made of welded metal materials, even with anti-corrosion and rust-preventive paint applied to both top and bottom surfaces, long-term use can still lead to localized corrosion and even perforation due to external rainwater and internal oil, affecting oil storage. Metal materials also have high thermal conductivity, causing rapid heat dissipation from the oil surface. This makes it difficult to maintain the tank temperature, and in cold weather, the oil is prone to solidification, requiring heating, a cumbersome process that increases maintenance costs. Furthermore, the welded structure can cause stress concentration at the weld points, leading to deformation over time, potentially resulting in the floating roof becoming stuck in the tank or the pontoon tearing. All these problems severely impact the oil storage capacity of floating roof oil storage tanks, making maintenance cumbersome, posing significant safety hazards, and incurring high maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a floating roof that solves the technical problems of existing floating roofs, such as easy rust and corrosion during use, cumbersome maintenance, and high maintenance costs. Another purpose of this invention is to provide an oil storage tank using this floating roof to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides a floating roof technical solution as follows:

[0006] A floating roof, made of non-metallic material, includes a main core layer. Above the main core layer is a flame-retardant layer containing a flame retardant agent, used to prevent open flames outside the floating roof from igniting the oil. Below the main core layer are an isolation layer and an antistatic layer. The isolation layer contains resin to prevent oil from the oil tank from penetrating into the main core layer. The antistatic layer contains graphite or carbon black to discharge static electricity generated by the oil in the oil tank. The antistatic layer is grounded via a wire.

[0007] Beneficial Effects: By using non-metallic materials to manufacture the floating roof, its weight is significantly reduced compared to metallic materials, which facilitates its installation and maintenance in oil storage tanks. Non-metallic materials are less susceptible to corrosion from oil or rainwater, preventing rust and perforation, greatly extending the durability and stability of the floating roof. Furthermore, compared to metallic materials, non-metallic materials have lower thermal conductivity and heat dissipation, effectively isolating and insulating the oil in the tank, solving the technical problems of easy rust and corrosion, cumbersome maintenance, and high maintenance costs associated with existing floating roof technologies. Because the floating roof is made of non-metallic materials, it is less prone to deformation and can adhere closely to the oil, thus eliminating the need for a flame-retardant layer at the bottom. The isolation layer prevents oil from penetrating into the main core layer, protecting it. The antistatic layer prevents fires and flash explosions, while the flame-retardant layer isolates the floating roof from external fires and other adverse conditions.

[0008] Preferably, the main core layer includes a sandwich layer, and further includes an upper reinforcing layer disposed at the upper end and a lower reinforcing layer disposed at the lower end of the sandwich layer; both the upper and lower reinforcing layers are made of glass fiber. The upper and lower reinforcing layers, made of glass fiber, clamp the sandwich layer together, effectively increasing the rigidity and strength of the main core layer and ensuring that the main core layer will not deform or break during use. At the same time, the upper and lower reinforcing layers also have a certain degree of corrosion resistance.

[0009] Preferably, the core layer is a honeycomb structure made of polypropylene core material. The polypropylene core material increases the buoyancy of the column core layer, and the closed-cell honeycomb structure further increases the stiffness of the core layer, ensuring the stability of the floating roof.

[0010] Preferably, the floating roof is provided with a sealing device at its circumferential edge. The sealing device includes three sealing layers spaced apart vertically. The sealing layers form a first annular cavity and a second annular cavity spaced vertically apart with the outer periphery of the floating roof and the inner wall of the tank. The first and second annular cavities are filled with inert gas. The sealing device also includes an annular airbag disposed within at least one of the first and second annular cavities. The annular airbag is connected to a gas source. The sealing device further includes a control valve, which controls the gas source to inflate the annular airbag to contact the inner wall of the tank and achieve a seal when the first or second annular cavity fails to seal. By providing sealing layers and introducing inert gas into the annular cavities formed by the sealing layers, the floating roof and the tank body are effectively airtight. The airbag and control valve further ensure the sealing performance between the floating roof and the tank when the annular cavity fails to seal.

[0011] Preferably, the control valve includes a valve body and a valve core slidably sealed within the valve body. Springs are provided at both ends of the valve core and between the valve body to hold the valve core in a neutral position. The valve body has a first chamber and a second chamber located on either side of the valve core's sliding direction. The end of the first chamber communicates with the first annular cavity, and the end of the second chamber communicates with the second annular cavity. The valve body has an air inlet and an air outlet corresponding to both the first and second chambers. The air inlets are connected to an air source, and the air outlets are connected to the annular air bladder. When the pressures in the first and second annular cavities are equal or the pressure difference is less than a set value, the valve core is in the neutral position to separate the air inlets and outlets in the first and second chambers. When the pressure difference between the first and second annular cavities is greater than the set value, the valve core is pushed to one end of the valve body to connect the air inlet and outlet of one of the first and second chambers. By changing the air pressure within the annular cavity, the valve body and valve core move and adjust automatically, thereby connecting the air source and the annular air bladder. The device adjusts automatically without manual operation. The control valve has an overall mechanical structure, requiring no electrical control, thus preventing situations such as fires.

[0012] The technical solution for an oil storage tank provided by this invention is as follows:

[0013] An oil storage tank includes a tank body for storing oil, and a floating roof disposed within the tank body. The floating roof is made of a non-metallic material and includes a main core layer. Above the main core layer is a flame-retardant layer containing a flame retardant agent, which is used to prevent open flames outside the floating roof from igniting the oil. Below the main core layer are an isolation layer and an antistatic layer. The isolation layer contains resin to prevent oil from the tank from penetrating into the main core layer. The antistatic layer contains graphite or carbon black to discharge static electricity generated by the oil in the tank, and the antistatic layer is grounded via a wire.

[0014] Beneficial Effects: By using non-metallic materials to manufacture the floating roof, its weight is significantly reduced compared to metallic materials, which facilitates its installation and maintenance in oil storage tanks. Non-metallic materials are less susceptible to corrosion from oil or rainwater, preventing rust and perforation, greatly extending the durability and stability of the floating roof. Furthermore, compared to metallic materials, non-metallic materials have lower thermal conductivity and heat dissipation, effectively isolating and insulating the oil in the tank, solving the technical problems of easy rust and corrosion, cumbersome maintenance, and high maintenance costs associated with existing floating roof technologies. Because the floating roof is made of non-metallic materials, it is less prone to deformation and can adhere closely to the oil, thus eliminating the need for a flame-retardant layer at the bottom. The isolation layer prevents oil from penetrating into the main core layer, protecting it. The antistatic layer prevents fires and flash explosions, while the flame-retardant layer isolates the floating roof from external fires and other adverse conditions.

[0015] Preferably, the main core layer includes a sandwich layer, and further includes an upper reinforcing layer disposed at the upper end and a lower reinforcing layer disposed at the lower end of the sandwich layer; both the upper and lower reinforcing layers are made of glass fiber. The upper and lower reinforcing layers, made of glass fiber, clamp the sandwich layer together, effectively increasing the rigidity and strength of the main core layer and ensuring that the main core layer will not deform or break during use. At the same time, the upper and lower reinforcing layers also have a certain degree of corrosion resistance.

[0016] Preferably, the core layer is a honeycomb structure made of polypropylene core material. The polypropylene core material increases the buoyancy of the column core layer, and the closed-cell honeycomb structure further increases the stiffness of the core layer, ensuring the stability of the floating roof.

[0017] Preferably, the floating roof is provided with a sealing device at its circumferential edge. The sealing device includes three sealing layers spaced apart vertically. The sealing layers form a first annular cavity and a second annular cavity spaced vertically apart with the outer periphery of the floating roof and the inner wall of the tank. The first and second annular cavities are filled with inert gas. The sealing device also includes an annular airbag disposed within at least one of the first and second annular cavities. The annular airbag is connected to a gas source. The sealing device further includes a control valve, which controls the gas source to inflate the annular airbag to contact the inner wall of the tank and achieve a seal when the first or second annular cavity fails to seal. By providing sealing layers and introducing inert gas into the annular cavities formed by the sealing layers, the floating roof and the tank body are effectively airtight. The airbag and control valve further ensure the sealing performance between the floating roof and the tank when the annular cavity fails to seal.

[0018] Preferably, the control valve includes a valve body and a valve core slidably sealed within the valve body. Springs are provided at both ends of the valve core and between the valve body to hold the valve core in a neutral position. The valve body has a first chamber and a second chamber located on either side of the valve core's sliding direction. The end of the first chamber communicates with the first annular cavity, and the end of the second chamber communicates with the second annular cavity. The valve body has an air inlet and an air outlet corresponding to both the first and second chambers. The air inlets are connected to an air source, and the air outlets are connected to the annular air bladder. When the pressures in the first and second annular cavities are equal or the pressure difference is less than a set value, the valve core is in the neutral position to separate the air inlets and outlets in the first and second chambers. When the pressure difference between the first and second annular cavities is greater than the set value, the valve core is pushed to one end of the valve body to connect the air inlet and outlet of one of the first and second chambers. By changing the air pressure within the annular cavity, the valve body and valve core move and adjust automatically, thereby connecting the air source and the annular air bladder. The device adjusts automatically without manual operation. The control valve has an overall mechanical structure, requiring no electrical control, thus preventing situations such as fires. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the oil storage tank provided by the present invention;

[0020] Figure 2 for Figure 1 Cross-sectional view of the floating roof;

[0021] Figure 3 for Figure 1 A schematic diagram of the sealing device between the intermediate tank and the floating roof;

[0022] Figure 4 for Figure 3 A schematic diagram of the structure of the annular airbag in the sealing device after it has expanded and bulged.

[0023] Figure 5 for Figure 1 Diagram illustrating the working principle of the airbag and air valve.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Tank body; 2. Floating roof; 3. Breathing device; 4. Sampling port; 5. Manhole; 6. Column; 7. Ladder; 8. Water collection tank; 9. Drainage pipe; 10. Support leg; 11. Flame retardant layer; 12. Sandwich layer; 13. Upper reinforcing layer; 14. Lower reinforcing layer; 15. Isolation layer; 16. Antistatic layer; 17. Upper sealing layer; 18. Middle sealing layer; 19. Lower sealing layer; 20. First annular cavity; 21. Second annular cavity; 22. Annular airbag; 23. Control valve; 24. Valve body; 25. Valve core; 26. First chamber; 27. Second chamber; 28. Air inlet; 29. ​​Air outlet; 30. First control port; 31. Second control port; 32. Return spring; 33. Air source. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising a…" does not exclude the process or method that includes said element.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0031] The present invention will be further described in detail below with reference to the embodiments.

[0032] Specific embodiment 1 of the oil storage tank provided by the present invention:

[0033] like Figures 1 to 4 As shown, the oil storage tank has a cylindrical structure, including a tank body 1 and a floating roof 2 that is floating within the tank body 1. The floating roof 2 is positioned above the oil in the tank body 1 and can float up and down within the tank body 1 as the oil level rises and falls. The floating roof 2 is a multi-layered structure made of non-metallic materials, meeting requirements for sealing the top of the tank body 1, flame retardancy, and anti-static properties.

[0034] like Figure 1As shown, to facilitate the adjustment, installation, and maintenance of the floating roof 2, multiple breathing devices 3 and sampling ports 4 are arranged at intervals on the outer surface of the floating roof 2. A ladder 7 is also provided for maintenance personnel to climb from the top of the tank to the floating roof 2 for maintenance, along with a manhole 5 for maintenance personnel to pass through. To prevent the floating roof 2 from rotating within the tank 1, vertically extending columns 6 are fixed to the inner wall of the tank 1, passing through the floating roof 2 to prevent circumferential rotation. Support legs 10 are also evenly distributed on the outer periphery of the floating roof 2. The support legs 10 are threaded onto the floating roof 2, with their upper ends extending upwards beyond the floating roof 2 and their lower ends protruding from the bottom surface of the floating roof 2. When the floating roof 2 falls to the bottom of the tank 1, the multiple support legs 10 support the floating roof 2, preventing it from contacting the bottom plate of the tank 1. Furthermore, due to their threaded assembly, the support height of the floating roof 2 at the bottom of the tank 1 can be adjusted, facilitating maintenance and leveling work. To prevent rainwater and other liquids from accumulating on the floating roof 2, a water collection trough 8 is also provided on the floating roof 2. The water collection trough 8 extends downward through the floating roof 2, and a drain outlet is provided at the lower end of the water collection trough 8. A drain pipe 9 is connected to the drain outlet and extends out of the tank body 1, thereby draining the water in the water collection trough 8 from the floating roof 2.

[0035] like Figure 2 As shown, the floating roof 2 is a disc-shaped structure composed of multiple non-metallic material layers. From top to bottom, its thickness is defined by a flame-retardant layer 11, an upper reinforcing layer 13, a core layer 12, a lower reinforcing layer 14, an isolation layer 15, and an antistatic layer 16. The core layer 12, serving as the main layer of the floating roof 2, is made of polypropylene core material. To ensure its buoyancy and rigidity in oil, the core layer 12 is processed into a honeycomb structure. The upper reinforcing layer 13 and the lower reinforcing layer 14 are wrapped around the upper and lower ends of the core layer 12. Both the upper reinforcing layer 13 and the lower reinforcing layer 14 are composite material layers composed of multiple layers of glass fiber, further enhancing the rigidity and stability of the core layer 12. In this embodiment, the upper reinforcing layer 13 and the lower reinforcing layer 14 can be laid onto the core layer 12 using a hand lay-up process.

[0036] like Figure 2As shown, to prevent external fires or explosions of the floating roof 2 from affecting the oil in the tank 1, a flame-retardant layer 11 is provided at the upper end of the upper reinforcing layer 13. The flame-retardant layer 11 is composed of a mixture of flame-retardant vinyl ester resin and carbon black, with added inorganic flame retardants, effectively providing fire protection. An antistatic layer 16 is provided at the bottom of the floating roof 2. When the floating roof 2 is placed in the tank 1, the lower surface of the antistatic layer 16 adheres to the oil. The antistatic layer 16 is connected to the grounding line and is composed of a mixture of vinyl ester resin and carbon black. It can conduct static electricity generated by oil friction and release it outwards through the wire, preventing accidents caused by frictional charging and reaction with the oil in the tank. To prevent oil from penetrating the antistatic layer 16 and upwards into the sandwich layer 12, thereby affecting the overall rigidity and strength of the floating roof 2, an isolation layer 15 is provided between the antistatic layer 16 and the lower reinforcing layer 14. The insulating layer 15 is made of resin-rich glass fiber mat or chopped strand mat, which isolates the antistatic layer 16 from the lower reinforcing layer 14. Specifically, the insulating layer 15 is manufactured by impregnating the glass fiber mat or chopped strand mat with an anti-aging and anti-corrosion resin and then bonding it to the lower end of the lower reinforcing layer 14, thereby forming an anti-corrosion and puncture-resistant insulating layer 15. In this embodiment, the density of the glass fiber mat or chopped strand mat in the insulating layer 15 is 25 to 50 g / m².

[0037] like Figures 3 to 4 As shown, an annular space is formed between the floating roof 2 and the inner wall of the tank 1. To ensure airtightness, a sealing device is provided at the circumferential edge of the floating roof 2. The sealing device seals the floating roof 2 and the inner wall of the tank 1, thereby isolating the annular space and ensuring overall isolation and sealing after the floating roof 2 is placed in the tank 1. The sealing device consists of three layers: a lower sealing layer 19, a middle sealing layer 18, and an upper sealing layer 17, from bottom to top. All three sealing layers are connected to the edge of the floating roof 2 and the tank 1, forming a second annular cavity 21 between the lower sealing layer 19 and the middle sealing layer, and a first annular cavity 20 between the middle sealing layer 18 and the upper sealing layer 17. Inert gas is filled into the first annular cavity 20 and the second annular cavity 21 to seal the annular space. To further ensure the airtightness of the sealing device, an annular airbag 22 is also provided in the second annular cavity 21. The sealing device also includes a control valve 23. The annular airbag 22 is made of elastic material. The oil storage tank also includes a gas source 33, which is fixed to the tank body 1 or placed on the ground. The gas source 33 is connected to the first annular cavity 20, the second annular cavity 21, and the annular air bladder 22. The gas source 33 and the annular air bladder 22 are connected via a control valve 23. When the seal of the first annular cavity 20 or the second annular cavity 21 fails, the control valve 23 connects the gas source 33 to the annular air bladder 22, inflating it and sealing the annular space. Figure 3As shown, when the first annular cavity 20 and the second annular cavity 21 are normally airtight, the annular airbag 22 does not expand in the second annular cavity 21. When the seal of the first annular cavity 20 or the second annular cavity 21 fails, such as... Figure 4 As shown, the annular airbag 22 expands and blocks the second annular cavity 21.

[0038] like Figure 5 As shown, the control valve 23 includes a valve body 24 and a valve core 25 that is slidably mounted on the valve body 24 and can move up and down. A first chamber 26 and a second chamber 27 are located within the valve body 24 in the direction of the up-and-down movement of the valve core 25, and the first chamber 26 and the second chamber 27 are arranged at intervals. Both the first chamber 26 and the second chamber 27 are provided with an air inlet 28 and an air outlet 29. The air inlet 28 is connected to an air source, and the air outlet 29 is connected to an annular airbag 22. When the valve core 25 moves to the outside of the valve body 24 where the first chamber 26 or the second chamber 27 is located, the valve core 25 connects the air outlet 29 with the air inlet 28, thereby connecting the air source to the annular airbag 22 and inflating the annular airbag 22. Return springs 32 are provided at both vertical ends of the valve core 25, holding the valve core 25 between the first chamber 26 and the second chamber 27 of the valve body 24, thereby separating the air inlet 28 and the air outlet 29. The valve core 25 also has a first control port 30 and a second control port 31 at its vertical ends. The first control port 30 is connected to the first annular cavity 20, and the second control port 31 is connected to the second annular cavity 21. When the pressure in the first annular cavity 20 and the second annular cavity 21 is stable, the return springs 32 hold the valve core 25 at the center position of the valve body 24 between the first chamber 26 and the second chamber 27. When one of the annular cavities leaks or is damaged, the pressure in the leaking chamber decreases, causing the gas in one of the control ports to flow rapidly, thus pushing the valve core 25 towards the chamber connected to the leaking annular cavity. This opens the air inlet 28 and the air outlet 29 of this chamber, allowing the air source 33 to inflate the annular airbag 22, causing it to expand and seal.

[0039] In this embodiment, the sandwich layer 12 and the upper reinforcing layer 13 and lower reinforcing layer 14 provided at its upper and lower ends together constitute the main core layer of the floating roof 2. The connection between each layer in the floating roof 2 is a direct bonding method using the thermoplastic deformation of non-metallic materials, and the connection arrangement can be carried out by hand lay-up process.

[0040] Specific embodiment 2 of the oil storage tank provided by the present invention:

[0041] The difference from Embodiment 1 is that, in Embodiment 1, the control valve 23 includes a valve body 24 and a valve core 25 slidably mounted on the valve body 24. The valve body 24 has a first chamber 26 and a second chamber 27. Each of the two chambers has an air inlet 28 and an air outlet 29. The valve core 25 is held at the center of the valve body 24 by a return spring 32, isolating the air source 33 and the annular airbag 22. When air leaks in the first annular chamber 20 or the second annular chamber 21, the valve core 25 moves towards the chamber connected to the leaking annular chamber due to the pressure difference, thereby connecting the air source 33 and the annular airbag 22, causing the annular airbag 22 to inflate. In this embodiment, sensors are installed in the first and second annular chambers to monitor pressure changes in both chambers. The sensors are connected to the control valve. When air leaks in the annular chambers, the sensors transmit a signal to the controller, which then opens the control valve, connecting the air source and the annular airbag. In other different embodiments, the internal structure and composition of the control valve can be changed, as long as it can automatically open and close to control the inflation and sealing of the airbag.

[0042] Specific embodiment 3 of the oil storage tank provided by the present invention:

[0043] The difference from Embodiment 1 is that, in Embodiment 1, the circumferential edge of the floating roof 2 is provided with a sealing device. This sealing device includes three sealing layers arranged at intervals in the vertical direction, with a first annular cavity 20 and a second annular cavity 21 formed between the three sealing layers. An annular airbag 22 is provided in the second annular cavity 21, connected to an air source 33 via a control valve 23 to achieve airtightness and enhanced sealing within the annular cavity. In this embodiment, the annular airbag is located in the first annular cavity. In other embodiments, annular airbags are provided in both the first and second annular cavities. In other different embodiments, the configuration of the sealing device can be changed; for example, the number of annular cavities can be increased or decreased, or no annular cavities can be formed, with the sealing layers arranged closely together, in which case an annular airbag may not be necessary. Alternatively, the sealing device can be configured with a structure similar to that of soft-seal sealing devices in the prior art.

[0044] Specific embodiment 4 of the oil storage tank provided by the present invention:

[0045] The difference from Example 1 is that, in Example 1, the core layer 12 is a honeycomb structure made of polypropylene core material. In this embodiment, the core layer can also be made of different plastic materials such as PP or PVC. In other embodiments, the shape of the core layer can also be changed, for example, it can be processed into a flat structure. In other different embodiments, the core layer can also be set as a different material structure such as a sponge board.

[0046] Specific embodiment 5 of the oil storage tank provided by the present invention:

[0047] The difference from Embodiment 1 is that, in Embodiment 1, the core layer 12 and the upper reinforcing layer 13 and lower reinforcing layer 14 covering its upper and lower ends together constitute the main core layer of the floating roof 2. Both the upper reinforcing layer 13 and the lower reinforcing layer 14 are made of glass fiber. In this embodiment, the number and position of the reinforcing layers can be changed, depending on the actual size and stiffness of the floating roof; of course, the upper and lower reinforcing layers can also be omitted. In other embodiments, the reinforcing layers can also be composite material layers made of carbon fiber and vinyl ester.

[0048] Specific embodiment 6 of the oil storage tank provided by the present invention:

[0049] The difference from Embodiment 1 is that, in Embodiment 1, a flame-retardant layer 11 is provided at the top of the floating roof 2, and the main core layer, the isolation layer 15, and the antistatic layer 16 are sequentially arranged below the flame-retardant layer 11. In this embodiment, a flame-retardant layer is also provided at the bottom of the floating roof.

[0050] The specific embodiments of the floating roof provided by this invention are consistent with the floating roof structures and compositions in the above embodiments, and will not be repeated here.

[0051] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A floating roof, characterized by: The floating roof is made of non-metallic material, comprising a main core layer, an upper fire-retardant layer provided above the main core layer, the fire-retardant layer comprising a fire retardant, a separation layer and an anti-static layer provided below the main core layer in sequence, resin provided in the separation layer, and graphite or carbon black provided in the anti-static layer and grounded through a wire. The floating roof is provided with a sealing device at the circumferential edge thereof, the sealing device comprising three sealing layers arranged in an up-down direction in a spaced manner, the sealing layers being used to form a first annular cavity and a second annular cavity for filling inert gas in an up-down spaced manner with the outer periphery of the floating roof and the inner wall of the tank body. The sealing device further comprises an annular air bag provided in at least one of the first annular cavity and the second annular cavity for connecting a gas source, and a control valve for controlling the gas source to fill air into the annular air bag to contact the inner wall of the tank body to realize sealing when the sealing of the first annular cavity or the second annular cavity fails. The control valve comprises a valve body and a valve core slidingly and sealingly assembled in the valve body, the valve body having a first chamber in communication with the first annular cavity and a second chamber in communication with the second annular cavity on both sides of the sliding direction of the valve core. The valve body is provided with a gas inlet connected to the gas source and a gas outlet connected to the annular air bag corresponding to the first chamber and the second chamber, and the valve core is provided with a spring separating the gas inlet and the gas outlet. When the pressure of the first annular cavity and the second annular cavity is equal or the pressure difference is less than a set value, the valve core is in an intermediate position to separate the gas inlet and the gas outlet in the first chamber and the second chamber; when the pressure difference of the first annular cavity and the second annular cavity is greater than the set value, the valve core is pushed to one end of the valve body to communicate the gas inlet and the gas outlet in one of the first chamber and the second chamber.

2. The floating roof according to claim 1, wherein: The main core layer comprises a sandwich layer, and further comprises an upper reinforcing layer provided at the upper end of the sandwich layer and a lower reinforcing layer provided at the lower end of the sandwich layer; the upper reinforcing layer and the lower reinforcing layer each comprise glass fiber.

3. The floating roof according to claim 2, wherein: The sandwich layer is a honeycomb structure made of polypropylene core material.

4. An oil storage tank comprising a tank body for storing oil, further comprising a floating roof disposed in the tank body, characterised in that: The floating roof is made of non-metallic material, comprising a main core layer, an upper fire-retardant layer provided above the main core layer, the fire-retardant layer comprising a fire retardant, a separation layer and an anti-static layer provided below the main core layer in sequence, resin provided in the separation layer, and graphite or carbon black provided in the anti-static layer and grounded through a wire. The floating roof is provided with a sealing device at the circumferential edge thereof, the sealing device comprising three sealing layers arranged in an up-down direction in a spaced manner, the sealing layers being used to form a first annular cavity and a second annular cavity for filling inert gas in an up-down spaced manner with the outer periphery of the floating roof and the inner wall of the tank body. The sealing device further comprises an annular air bag provided in at least one of the first annular cavity and the second annular cavity for connecting a gas source, and a control valve for controlling the gas source to fill air into the annular air bag to contact the inner wall of the tank body to realize sealing when the sealing of the first annular cavity or the second annular cavity fails. The control valve comprises a valve body and a valve core slidingly and sealingly assembled in the valve body, the valve body having a first chamber in communication with the first annular cavity and a second chamber in communication with the second annular cavity on both sides of the sliding direction of the valve core. The valve body is provided with an air inlet connected with the air source and an air outlet connected with the annular air bag corresponding to the first chamber and the second chamber, and the valve core is provided with a spring between both ends and the valve body to separate the air inlet and the air outlet; When the pressure of the first annular cavity and the second annular cavity is equal or the pressure difference is less than a set value, the valve core is in the intermediate position to separate the air inlet and the air outlet in the first chamber and the second chamber; when the pressure difference of the first annular cavity and the second annular cavity is greater than the set value, the valve core is pushed to one end of the valve body to communicate the air inlet and the air outlet in one of the first chamber and the second chamber.

5. The oil storage tank of claim 4, wherein: The main core layer comprises a sandwich layer, and further comprises an upper reinforcing layer arranged at the upper end of the sandwich layer and a lower reinforcing layer arranged at the lower end of the sandwich layer; the upper reinforcing layer and the lower reinforcing layer both comprise glass fibers.

6. The oil storage tank of claim 5, wherein: The sandwich layer is a honeycomb structure made of a polypropylene core material.

Images