Device for slowing down corrosion of inner wall of outlet of seawater pipe
By installing a base and aluminum-based anode material on the inner wall of the seawater pipe outlet, the corrosion problem of the inner wall of the seawater pipe outlet was solved, achieving effective corrosion protection and equipment protection, and reducing material costs.
Patent Information
- Application Number
- CN202520839566.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-04-29
AI Technical Summary
The inner wall of the seawater pipe outlet is severely corroded due to numerous welds and the erosion caused by flowing seawater, making it difficult for existing technologies to effectively protect it.
The device employs a base and aluminum-based anode material to mitigate corrosion. The base is made of iron blocks, and the anode material covers the flow channels. The channels are connected by conductive wires and equipped with a mesh protective cover to achieve uniform corrosion protection.
It effectively slows down the corrosion of the inner wall of the seawater pipe outlet, prevents the anode material from breaking and contaminating the equipment, has a simple and reliable structure, reliable operation, reduces material costs, and is highly practical.
Smart Images
Figure CN223975755U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of marine engineering technology, specifically a device for mitigating corrosion of the inner wall of a seawater pipe outlet. Background Technology
[0002] The seawater lifting system is a crucial piece of equipment on offshore platforms. It is primarily used to pump seawater to the main body of the platform when it is raised above the waterline for operations, providing cooling for equipment, firefighting, and deck washing. The system consists of submersible pumps and pump towers. The lifting pumps can be adjusted to different heights depending on the operating water depth of the offshore platform. The pump towers are equipped with several seawater outlets at different heights, connected to a fixed seawater main pipe on the platform via flexible hoses. When the platform is operating in a specific area, one seawater outlet from the pump tower connects to the fixed seawater main pipe on the platform to supply water. The seawater outlet pipes of other pump towers are sealed with blind flanges. Currently, offshore platform seawater lifting systems mainly come in several forms, including independent seawater tower type, pile-leg seawater tower type, and flexible hose winch type seawater pumps. The seawater lifting system in this project is an independent seawater tower type, with an equilateral triangular truss structure. The seawater pumps and seawater outlet pipelines are installed inside the pump tower's vertical pipe, which also serves as the foundation for the truss structure. The entire seawater discharge pipeline is equipped with multiple discharge outlets at different heights, and the ends of the seawater discharge outlets are sealed with blind flanges. During manufacturing, the main seawater discharge pipeline is galvanized. After assembly and welding, the outer surface of the zinc layer damaged by the high temperature of welding is repaired with zinc-rich paint. However, during the manufacturing of the truss-type pump tower, there are too many welds, resulting in an excessively large area of damage to the zinc layer inside the seawater discharge pipe. It is impossible to repair the galvanized layer from the inside, and corrosion will be severe under the erosion of flowing seawater. Summary of the Invention
[0003] This invention provides a device for mitigating corrosion of the inner wall of a seawater pipe outlet and an integrated device for using the device, thereby addressing the technical deficiencies of the prior art.
[0004] To solve the above-mentioned technical problems, the present invention provides a device for mitigating corrosion of the inner wall of a seawater pipe outlet. The device includes a base with a frustum-shaped sidewall, the smaller end of which faces downwards. The difference in diameter between the top and bottom of the frustum is small. An integral ring, coaxial with the frustum, is located on the inner side of the bottom of the frustum. The central hole of the ring is adapted to a connecting bolt. An integrally formed coaxial ring with a small width is located on the outer side of the top of the frustum. An anode material is coated on the base. The coated anode material is cylindrical, with its bottom surface flush with the bottom of the base. The height of the anode material is greater than the height of the base. The diameter of the anode material is equal to the diameter of the seawater outlet sealing blind flange. The central hole of the ring at the bottom of the frustum penetrates the anode material, forming a bolt connection channel. A mesh protective cover surrounding the anode material is also provided on the flange of the seawater outlet sealing blind flange. A guide groove is also provided on the surface of the coated anode material.
[0005] Specifically, the anode material is an aluminum-based anode material.
[0006] Specifically, the aluminum-based anode material is a composite aluminum-based anode material.
[0007] Specifically, the composite aluminum-based anode material is a nano-modified composite aluminum-based anode material.
[0008] Specifically, the base is made of iron blocks.
[0009] Specifically, the connection between the anode material and the inner wall of the seawater pipe outlet is a conductive wire.
[0010] Specifically, the connecting bolt is equipped with a matching flat spring washer.
[0011] Specifically, the anode material is embedded with a resistance probe, and the data is transmitted wirelessly to the monitoring platform.
[0012] Due to the anode material and the mesh protective cover, this utility model can not only slow down the corrosion of the inner wall of the seawater pipe outlet, but also prevent the anode material from breaking and contaminating the equipment. The device has a simple structure, reliable operation, and strong practicality. The surface of the anode material is also provided with a guide groove, which can disperse the water flow pressure, avoid the anode from falling off due to high-speed water flow, or local scouring corrosion, and can also increase the active sites. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.
[0014] Figure 1 This is a schematic diagram of the sacrificial anode operation of this utility model.
[0015] Figure 2This is a schematic diagram of the sacrificial anode structure of this utility model.
[0016] The components include: 1. Blind flange; 2. Sacrificial anode; 3. Bolts / flat spring washers / nuts; 4. Connecting conductive wires. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0018] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by a person of ordinary skill in the art to which this application pertains.
[0019] like Figure 1 , Figure 2As shown, the present invention provides a device for mitigating corrosion of the inner wall of a seawater pipe outlet. The device includes a base with a frustum-shaped sidewall. The smaller end of the frustum faces downwards, and the difference in diameter between the top and bottom of the frustum is small. An integral ring, coaxial with the frustum, is located on the inner side of the bottom of the frustum. The central hole of the ring is adapted to a connecting bolt. An integrally formed coaxial ring with a smaller ring width is located on the outer side of the top of the frustum. An anode material is coated on the base. The anode material is cylindrical, with its bottom on the same plane as the bottom of the base. The height of the anode material is greater than the height of the base. The diameter of the anode material is equal to the diameter of the seawater outlet sealing blind flange. The central hole of the ring at the bottom of the frustum penetrates the anode material, forming a bolt connection channel. A mesh protective cover surrounding the anode material is also provided on the flange of the seawater outlet sealing blind flange. A guide groove is also provided on the surface of the coated anode material. In use, threaded holes are drilled in the blind flange 1, sacrificial anode 2 is installed, and fixed with bolt assembly 3 (including flat spring washer). The base supports the anode material. The base is disc-shaped, and the geometric symmetry of the disc ensures isotropic corrosion of the anode material, avoiding local over-loss and ensuring that the protective current evenly covers the protected surface. At the same time, the smooth edges reduce electric field distortion and lower the risk of premature failure in the edge area. The disc design is also compatible with annular or cylindrical structures (such as pipes and pile foundations), allowing for close-fitting installation on the inner / outer wall and saving space. The anode material provides protection for the inner wall of the seawater pipeline, while the bolt assembly connection is reliable. The bolt connection has high toughness and plasticity, reliable force transmission, and a firm connection that is not easy to loosen or slip. Under seawater immersion and the impact of seawater in the pipeline, the anode material is very likely to break. The mesh protective cover can prevent the anode material from breaking and contaminating the equipment. The surface of the anode material is also equipped with a guide groove, which can disperse the water flow pressure, avoid the anode from falling off due to high-speed water flow, or local erosion corrosion, and can also increase the active sites.
[0020] Specifically, the anode material is an aluminum-based anode material, which has high current efficiency and is suitable for seawater, ships, and offshore platforms.
[0021] Specifically, the aluminum-based anode material is a composite aluminum-based anode material, which can further reduce the overall potential of the aluminum-based anode, forming a larger potential difference, thereby enhancing the driving force on the protected metals such as steel and copper.
[0022] Specifically, the composite aluminum-based anode material is a nano-modified composite aluminum-based anode material, which can significantly improve current efficiency and passivation resistance after modification.
[0023] Specifically, the base is made of iron blocks. The tensile strength of the iron base (such as low-carbon steel or alloy steel) far exceeds that of traditional anode materials, making it suitable for bearing complex mechanical stresses. The iron base is not easily deformed under high pressure or impact loads, ensuring stable electrical contact between the anode material and the protected object. The material cost is low; the iron base can be quickly formed using mature processes such as welding, casting, and stamping, reducing manufacturing costs.
[0024] Specifically, the connection between the anode material and the inner wall of the seawater pipe outlet is made by a conductive wire. Since there is an aramid gasket between the blind flange and the seawater pipe flange, and the gasket may not be conductive, a connecting wire 4 is added.
[0025] Specifically, the connecting bolts are equipped with matching flat spring washers, which can prevent loosening and vibration, enhance connection stability, distribute pressure, and protect the connection surface.
[0026] Specifically, the anode material is embedded with a resistance probe, and the data is wirelessly transmitted to a monitoring platform, which can monitor, manage, and replace the anode material in real time.
[0027] Another technical solution of this utility model is a modular integrated device. The integrated module is a device for mitigating corrosion of the inner wall of a seawater pipe outlet. The number of integrated modules can be determined according to the required protection area.
[0028] The above description is merely an exemplary embodiment of this application and is not intended to limit the scope of protection of this application. The scope of protection of this application is determined by the appended claims.
Claims
1. A device for reducing the corrosion of the inner wall of a seawater pipe outlet, characterized in that The base comprises a circular cone side wall, the circular cone small end is downward, the diameter difference between the top and bottom of the circular cone is small, the inside of the bottom of the circular cone has an integral ring coaxial with the circular cone, the center hole of the ring is matched with the connecting bolt, the outside of the top of the circular cone has an integral ring coaxial with the circular cone, the base is coated with anode material, the anode material is in the shape of a cylinder as a whole, the bottom of the anode material is in the same plane with the bottom of the base, the height of the anode material is greater than the height of the base, the diameter of the anode material is equal to the diameter of the seawater discharge outlet blanking plate, the center hole of the ring at the bottom of the circular cone penetrates the anode material to form a bolt connection channel, the flange of the seawater discharge outlet blanking plate is further provided with a mesh protective cover surrounding the anode material, and the surface of the anode material is further provided with a flow guide groove.
2. A device for reducing the corrosion of the inner wall of the outlet of a seawater pipe according to claim 1, characterized in that The anode material is an aluminum-based anode material.
3. A device for reducing the corrosion of the inner wall of the outlet of a seawater pipe according to claim 1, characterized in that The base is made of iron block.
4. A device for reducing the corrosion of the inner wall of the outlet of a seawater pipe according to claim 1, characterized in that An electrically conductive wire is connected between the anode material and the inner wall of the seawater pipe outlet.
5. A device for reducing the corrosion of the inner wall of the outlet of a seawater pipe according to claim 1, characterized in that The connecting bolt is provided with a matched flat spring pad.
6. A device for reducing the corrosion of the inner wall of the outlet of a seawater pipe according to any one of claims 1 to 5, characterized in that The anode material is embedded with a resistance probe, and data is transmitted to the monitoring platform wirelessly.