Tank top anti-rotation bolt sealing device

Abstract

The utility model discloses a tank top anti-rotation bolt sealing device, and belongs to the technical field of tank top sealing. The tank top anti-rotation bolt sealing device comprises a vertical cylindrical storage tank, a tank top is installed on the top face of the vertical cylindrical storage tank, an open hole is formed in one side of the top face of the tank top, a sleeve is connected into the open hole in a penetrating mode, a bolt with a hook is inserted into the sleeve in a penetrating mode, the top end of the bolt with the hook penetrates through the sleeve, and the top end of the bolt with the hook penetrates through the open hole. A steel pipe nipple is welded to the portion, located outside the open hole, of the tank top, the top end of the steel pipe nipple is in threaded connection with a pipe cap, and one end of the hook bolt is sleeved with a flat gasket and a sealing gasket. The sealing device effectively solves the sealing problem of the anti-rotation steel cable of the inner floating disc of the steel vertical cylindrical storage tank at a fixed bolt part at the top of the tank, and is simple, convenient, reliable and easy to implement.

Description

Technical Field

[0001] This utility model relates to the field of tank top sealing technology, specifically a tank top anti-rotation bolt sealing device. Background Technology

[0002] Steel vertical cylindrical storage tanks are atmospheric pressure vessels and are essential basic equipment in industries such as petroleum and chemical engineering. They are mainly used to store various liquid (or gaseous) raw materials, semi-finished products, and finished products. The tank body is a cylinder formed by welding multiple rings of steel plates, and the top of the tank is a spherical crown formed by welding multiple fan-shaped plates. Storage tanks are simple to manufacture and inexpensive, making them widely used in many industries both domestically and internationally.

[0003] Vertical cylindrical storage tanks are primarily used for storing liquid hazardous chemicals, such as acids, alkalis, inorganic compounds, organic compounds, and petroleum products. When used to store volatile liquids, a floating roof is typically installed inside the tank. An internal floating roof floats on the liquid surface, and a protective gas at 1.5-2 kPa is pumped above the roof, eliminating evaporation space and reducing evaporation loss by 85%–95%. Furthermore, the floating roof isolates the liquid from the air, reducing air pollution and the likelihood of fires and explosions. However, these tanks have long continuous operating cycles (generally 5-6 years, or even longer), during which the operation of the internal floating roof cannot be observed, making maintenance inconvenient.

[0004] This application references prior art authorization announcement number CN209720523U, a novel assembled internal floating roof for storage tanks. The internal floating roof should move smoothly up and down without tilting or rotating during use. To prevent rotation, an anti-rotation device is installed, typically using two steel wire ropes distributed on both sides and passing through the floating roof. The bottom of the wire ropes is connected to a spring tensioning device (mainly composed of a spring and turnbuckles) welded to the tank bottom plate, and the top is hung on a hook bolt, secured to the tank top with nuts through an outlet hole. The nuts and outlet hole end faces are usually equipped with sealing gaskets to prevent gas from entering the atmosphere and causing pollution. However, the bolts, nuts, and sealing gaskets are exposed to the atmosphere year-round, subject to wind, sun, and rain. The bolts and nuts rust, and the sealing gaskets, in particular, age and leak. Due to the special structure, tightening is inconvenient, and replacement is not possible, leading to leakage of the mixture of hazardous chemicals and protective gases inside the tank, causing air pollution and certain safety hazards. Utility Model Content

[0005] To address the problems raised in the background art, this utility model provides a sealing device for anti-rotation bolts on tank tops.

[0006] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0007] A tank top anti-rotation bolt sealing device includes a vertical cylindrical storage tank. A tank top is installed on the top surface of the vertical cylindrical storage tank. An opening is provided on one side of the top surface of the tank top. A sleeve is inserted into the opening. A hook bolt is inserted into the sleeve. The top end of the hook bolt passes through the sleeve and is threaded with a nut. A short steel pipe section is welded to the outside of the opening on the tank top. A pipe cap is threaded to the top end of the short steel pipe section.

[0008] One end of the hook bolt is fitted with a flat washer and a sealing washer; the flat washer and the sealing washer are stacked in sequence, with the top surface of the flat washer contacting the bottom surface of the nut and the bottom end of the sealing washer contacting the top surface of the sleeve.

[0009] The bottom end of the hook bolt extends into the interior of the vertical cylindrical tank and is attached to a steel wire rope. The other end of the steel wire rope passes through the inner floating plate of the vertical cylindrical tank and is connected to the spring tensioning device on the bottom plate of the tank to limit the rotation of the inner floating plate.

[0010] The beneficial effects of adopting the above-mentioned further solution are that the flat gasket increases the contact area between the nut and the sealing gasket, making the pressure distribution more uniform when the nut is tightened, and preventing the sealing gasket from being crushed. The sealing gasket directly plays a sealing role, preventing the medium from leaking from the gap between the sleeve and the hook bolt, improving the sealing performance of the device, and ensuring that the sealing gasket can be evenly stressed when subjected to the tightening force of the nut, thus better performing its sealing function. At the same time, this structural design ensures the stability and reliability of the seal, preventing seal failure due to uneven stress on the sealing gasket.

[0011] Furthermore, the cap and the nut are on the same vertical axis.

[0012] The advantages of adopting the above-mentioned further solution are that it ensures the balance and stability of the device under stress, helps to evenly distribute pressure, prevents damage to components or failure of seals due to eccentric force, and facilitates the use of socket wrench tools.

[0013] Furthermore, a gap is provided between the inner wall of the steel pipe section and the outer wall of the sleeve.

[0014] The advantages of adopting the above-mentioned further solution are that it provides a certain adjustment space during the installation process, making it easier to accurately install the sleeve inside the steel pipe section. At the same time, during the use of the device, this spacing can also accommodate a certain degree of thermal expansion and contraction, reducing damage to the device caused by thermal deformation and improving the adaptability and reliability of the device.

[0015] Furthermore, the sealing gasket is made of polytetrafluoroethylene.

[0016] The beneficial effects of adopting the above-mentioned further solutions are that polytetrafluoroethylene has excellent corrosion resistance, and at the same time, it has good sealing performance, which can effectively prevent media leakage and ensure the sealing of the storage tank.

[0017] Furthermore, the outer walls of the hook bolt and the nut are coated with a rust inhibitor.

[0018] The beneficial effect of adopting the above-mentioned further solutions is that it can effectively prevent bolts and nuts from being corroded by corrosive media such as moisture and oxygen in the external environment, and reduce the occurrence of rust and corrosion.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This type of anti-rotation bolt sealing device for tank top effectively solves the sealing problem of the anti-rotation steel cable of the internal floating roof at the fixed bolt position on the top of the steel vertical cylindrical storage tank. It is simple, reliable, and easy to implement. By welding a short steel pipe section to the outside of the opening on the top of the tank and connecting it with the pipe cap through threads, it can effectively prevent rainwater, dust, and other impurities from entering the opening on the top of the tank, thus achieving a good sealing effect. The hook bolt of this application passes through the sleeve and is tightened by the nut. Together with the short steel pipe section and the pipe cap, it ensures the stability of the bolt connection and guarantees the sealing and safety of the storage tank. This application solves the problem that bolts, nuts, and sealing gaskets are exposed to the atmosphere all year round, and are subject to wind, sun, and rain. The bolts and nuts rust, and especially the sealing gaskets age and leak. However, due to the special structure, it is inconvenient to tighten or replace them, which leads to the leakage of the mixture of hazardous chemicals and protective gases inside the tank, causing air pollution and certain safety hazards. Attached Figure Description

[0021] Figure 1 A three-dimensional schematic diagram of a tank top anti-rotation bolt sealing device provided by this utility model;

[0022] Figure 2 A cross-sectional view of a tank top anti-rotation bolt sealing device provided by this utility model.

[0023] In the diagram: 101. Vertical cylindrical storage tank; 1. Steel pipe section; 2. Pipe cap; 3. Nut; 4. Flat gasket; 5. Sealing gasket; 6. Sleeve; 7. Hook bolt; 8. Tank top; 9. Steel wire rope. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-2 This utility model provides a technical solution: a tank top anti-rotation bolt sealing device, including a vertical cylindrical storage tank 101, a tank top 8 installed on the top surface of the vertical cylindrical storage tank 101, an opening provided on one side of the top surface of the tank top 8, a sleeve 6 inserted and connected inside the opening, a hook bolt 7 inserted inside the sleeve 6, the top end of the hook bolt 7 passing through the sleeve 6 and threadedly connected to a nut 3, a steel pipe short section 1 welded to the outside of the opening of the tank top 8, a pipe cap 2 threadedly connected to the top end of the steel pipe short section 1, by welding the steel pipe short section 1 to the outside of the opening of the tank top 8 and threadedly connecting it to the pipe cap 2, can effectively prevent rainwater, dust and other impurities from entering the opening of the tank top, and play a good sealing role. The hook bolt 7 passes through the sleeve 6 and is tightened by the nut 3. The sleeve 6 mates with the steel pipe section 1 to ensure the stability of the bolt connection. The steel wire rope 9, connected to the bottom of the hook bolt, passes through the inner floating roof, and the other end is connected to the ground anchor and spring tension on the bottom plate of the storage tank. The turnbuckle is used to tighten the steel wire rope, thereby subjecting the nut 3 at the top to force, pressing the gasket 5, and achieving a sealing effect, ensuring the sealing and safety of the storage tank. This application solves the problem that the bolts, nuts, and sealing gaskets of the new type of assembled inner floating roof storage tank (CN209720523U) are exposed to the atmosphere all year round, and are subject to wind, sun, and rain. The bolts and nuts rust, and the sealing gaskets, in particular, age and leak. Due to the special structure, it is inconvenient to tighten or replace them, which leads to the leakage of the mixture of hazardous chemicals and protective gases inside the tank, causing air pollution and certain safety hazards.

[0026] In one embodiment of this utility model, a flat washer 4 and a sealing gasket 5 are fitted onto one end of the hook bolt 7. The flat washer 4 increases the contact area between the nut 3 and the sealing gasket 5, making the pressure distribution more uniform when the nut is tightened and preventing the sealing gasket 5 from being crushed. The sealing gasket 5 directly plays a sealing role, preventing the medium from leaking from the gap between the sleeve 6 and the hook bolt 7, thus improving the sealing performance of the device.

[0027] In one embodiment of this utility model, the flat gasket 4 and the sealing gasket 5 are stacked sequentially, with the top surface of the flat gasket 4 contacting the bottom surface of the nut 3, and the bottom end of the sealing gasket 5 contacting the top surface of the sleeve 6. This ensures that the sealing gasket 5 is evenly stressed when subjected to the tightening force of the nut 3, thus better fulfilling its sealing function. Simultaneously, this structural design guarantees the stability and reliability of the seal, preventing seal failure due to uneven stress on the sealing gasket.

[0028] As one embodiment of this utility model, the bottom end of the hook bolt 7 extends into the interior of the vertical cylindrical storage tank 101 and is attached to a steel wire rope 9. The internal floating roof inside the vertical cylindrical storage tank should move up and down smoothly without tilting or rotating during use. To prevent the internal floating roof from rotating, an anti-rotation device is installed. This is typically achieved by two steel wire ropes distributed on both sides and passing through the floating roof. The bottom of the steel wire ropes is connected to a spring tensioning device (mainly composed of a spring and a turnbuckle) welded to the bottom plate of the storage tank, thereby ensuring the integrity of the device and the normal operation of the storage tank, and improving the safety of the equipment.

[0029] As an embodiment of this utility model, the cap 2 and the nut 3 are located on the same vertical axis, which ensures the balance and stability of the device when subjected to force, and at the same time helps to evenly distribute the pressure and prevent damage to components or failure of the seal due to eccentric force.

[0030] As one embodiment of this utility model, a gap is further provided between the inner wall of the steel pipe section 1 and the outer wall of the sleeve 6, providing a certain adjustment space during the installation process, making it easier to accurately install the sleeve 6 inside the steel pipe section 1. At the same time, during the use of the device, this gap can also accommodate a certain degree of thermal expansion and contraction, reducing damage to the device caused by thermal deformation and improving the adaptability and reliability of the device.

[0031] As one embodiment of this utility model, the sealing gasket 5 is made of polytetrafluoroethylene (PTFE). PTFE has excellent corrosion resistance and good sealing performance, which can effectively prevent media leakage and ensure the sealing of the storage tank.

[0032] As an embodiment of this utility model, the outer walls of the hook bolt 7 and the nut 3 are coated with rust inhibitor, which can effectively prevent the bolt and nut from being corroded by moisture, oxygen and other corrosive media in the external environment, and reduce the occurrence of rust and corrosion.

[0033] Specifically, the working principle of this anti-rotation bolt sealing device for tank top is as follows: First, the sleeve 6 is inserted into the opening of the tank top 8. Then, the hook bolt 7 is passed through the sleeve 6. A flat washer 4 and a sealing gasket 5 are fitted onto one end of the hook bolt 7. The flat washer 4 contacts the bottom surface of the nut 3, and the sealing gasket 5 contacts the top surface of the sleeve 6. By rotating the nut 3, the flat washer 4 increases the force-bearing area, evenly compressing the sealing gasket 5, thus achieving a seal between the sleeve 6 and the hook bolt 7, preventing media leakage from the gap. A short steel pipe section 1 is welded to the outside of the opening in the tank top 8 and threadedly connected to the pipe cap 2, forming an external seal against the opening to prevent external impurities from entering. The bottom end of the hook bolt 7 extends into the interior of the vertical cylindrical storage tank 101 and is connected to a steel wire rope 9. The other end of the steel wire rope 9 passes through the inner floating plate located in the vertical cylindrical storage tank 101 and is connected to the spring tensioning device on the tank bottom plate to limit the rotation of the inner floating plate. The pipe cap 2 and the nut 3 are on the same vertical axis, making the device more balanced and stable under force. The distance between the inner wall of the steel pipe section 1 and the outer wall of the sleeve 6 facilitates installation and adapts to thermal expansion and contraction. The sealing gasket 5 is made of polytetrafluoroethylene, which, with its good corrosion resistance and sealing performance, ensures long-term stable sealing. The rust inhibitor applied to the outer walls of the hook bolt 7 and the nut 3 prevents rust and corrosion, maintains the connection tightness, ensures the continuous and stable operation of the entire device, and achieves effective sealing of the opening at the top of the tank and rust prevention of the bolts.

Claims

1. A tank top anti-rotation bolt seal apparatus, characterized by, The system includes a vertical cylindrical storage tank (101), on which a tank top (8) is installed. An opening is provided on one side of the top surface of the tank top (8). A sleeve (6) is inserted through the opening. A hook bolt (7) is inserted through the sleeve (6). The top end of the hook bolt (7) passes through the sleeve (6) and is threaded with a nut (3). A steel pipe section (1) is welded to the outside of the opening on the tank top (8). A pipe cap (2) is threaded to the top end of the steel pipe section (1). One end of the hook bolt (7) is fitted with a flat washer (4) and a sealing washer (5); the flat washer (4) and the sealing washer (5) are stacked in sequence, the top surface of the flat washer (4) is in contact with the bottom surface of the nut (3), and the bottom end of the sealing washer (5) is in contact with the top surface of the sleeve (6); The bottom end of the hook bolt (7) extends into the interior of the vertical cylindrical tank (101) and is attached to a wire rope (9). The other end of the wire rope (9) passes through the inner floating plate of the vertical cylindrical tank (101) and is connected to the spring tensioning device of the tank bottom plate to limit the rotation of the inner floating plate.

2. A roof-to-shell bolting device according to claim 1, wherein, The cap (2) and the nut (3) are on the same vertical axis.

3. A roof-to-shell bolting device according to claim 1, wherein, There is a gap between the inner wall of the steel pipe section (1) and the outer wall of the sleeve (6).

4. A roof-to-shell bolting device according to claim 1, wherein, The sealing gasket (5) is made of polytetrafluoroethylene.

5. A roof-to-shell bolting device according to claim 1, wherein, The outer walls of the hook bolt (7) and the nut (3) are coated with rust inhibitor.

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