A petroleum pipeline thickening anticorrosion sacrificial anode discharge tube

Abstract

The utility model relates to the technical field of sacrificial anode protection, more specifically, a kind of petroleum pipeline thickening anticorrosion sacrificial anode discharge tube. Including pipe body, pipe body is coaxial integrated structure, pipe body includes thickening section, left end thin tube section and right end thin tube section, the wall thickness of thickening section is greater than the wall thickness of left end thin tube section and right end thin tube section, thickening section is set between left end thin tube section and right end thin tube section, left end thin tube section and right end thin tube section length are equal, symmetrically set. The device is a kind of new sacrificial anode discharge tube with optimized structure, efficient protection, stable installation and reliable strength. The utility model is mainly applied to the aspect of petroleum pipeline thickening anticorrosion sacrificial anode discharge tube.

Description

Technical Field

[0001] This utility model relates to the field of sacrificial anode protection technology, and more specifically, to a thickened anti-corrosion sacrificial anode discharge tube for oil pipelines. Background Technology

[0002] As a core infrastructure for energy transmission, oil pipelines operate for extended periods in complex electrolyte environments such as soil and groundwater, leading to significant corrosion and failure issues that seriously threaten the operational safety and service life of the pipeline network. Sacrificial anode cathodic protection, with its advantages of requiring no external power supply, high protective stability, and convenient construction and maintenance, has become a key technology in oil pipeline corrosion protection systems and is widely used in the field of buried pipeline protection. Currently, the industry generally adopts tubular sacrificial anodes as the core discharge component. Their structural rationality, electrochemical activity, and mechanical stability directly determine the current output efficiency, protective uniformity, and full-cycle reliability of the cathodic protection system, making them the core carrier for improving pipeline corrosion protection.

[0003] As long-distance pipelines develop towards more complex geological conditions and higher service intensity, the structural shortcomings of traditional tubular sacrificial anodes are becoming increasingly apparent, making them inadequate for meeting high-standard protection requirements. Existing pipe fittings are mostly integral structures with equal diameter and wall thickness, resulting in concentrated current conduction and insufficient effective electrochemical contact area. This easily leads to localized anode passivation and uneven current distribution, causing inadequate or overprotected localized areas of the pipeline. Furthermore, the overall strength and deformation resistance of the pipe fittings are relatively weak, making them prone to deformation and joint cracking under external forces such as underground construction and geological subsidence. This disrupts the continuity of the electrochemical circuit and reduces the stability of the protection system.

[0004] From the perspective of pain points in engineering applications, traditional pipe fittings suffer from poor installation and positioning accuracy, making them prone to assembly misalignment and affecting the current conduction path and protection range. The simple pipe wall structure cannot balance current conduction efficiency and structural strength, resulting in low anode utilization and shortened protection life. Furthermore, the uniform cross-section design makes it difficult to achieve synergistic optimization of corrosion-resistant contact area and structural strength, leading to insufficient electrochemical reactions, further exacerbating the degradation of protective effects and increasing subsequent maintenance and replacement costs.

[0005] Existing technologies mostly focus on optimizing anode material formulations or simple shape improvements, without systematic innovation in aspects such as tube wall structure, positioning accuracy, and strength enhancement. This makes it difficult to solve core problems such as uneven current distribution, installation and positioning deviations, and easy structural deformation. Utility Model Content

[0006] To overcome the shortcomings of the existing technology, this utility model provides a thickened anti-corrosion sacrificial anode discharge tube for oil pipelines. This device is a new type of sacrificial anode discharge tube with optimized structure, high protection efficiency, stable installation, and reliable strength. Through integrated structural design and local reinforcement, it improves electrochemical protection performance and structural stability, meeting the engineering requirements for long-term corrosion protection of long-distance oil pipelines.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A thickened, corrosion-resistant sacrificial anode discharge tube for oil pipelines includes a tube body, which is a coaxial integral structure. The tube body includes a thickened section, a left-end thin tube section, and a right-end thin tube section. The wall thickness of the thickened section is greater than the wall thickness of the left-end thin tube section and the right-end thin tube section. The thickened section is disposed between the left-end thin tube section and the right-end thin tube section, and the left-end thin tube section and the right-end thin tube section are of equal length and symmetrically arranged.

[0008] It also includes an outer wall annular structure, the outer wall of the thickened section is provided with the outer wall annular structure, the outer wall annular structure is surrounded by a groove, the outer wall annular structure is used to increase the anti-corrosion contact area and improve the protection effect.

[0009] It also includes end positioning steps. The outer ends of the left and right thin tube segments are provided with the end positioning steps. The end positioning steps are used for installation positioning to prevent assembly misalignment.

[0010] It also includes axial thin ribs on the inner wall. The inner wall of the tube is provided with axial thin ribs along the axial direction. The axial thin ribs on the inner wall are radiating and are used to improve the strength and deformation resistance of the tube.

[0011] The length of the thickened section is one-fifth to one-quarter of the total length of the tube body, and the wall thickness of the thickened section is two to three millimeters thicker than the wall thickness of the thinner tube section at the left end and the thinner tube section at the right end.

[0012] The tube body is integrally formed by centrifugal casting, resulting in a seamless, one-piece structure. The thickened section, the left-end thin tube section, and the right-end thin tube section transition smoothly. Compared with the prior art, the beneficial effects of this utility model are as follows: This device adopts a coaxial integrated structural design. Through the combination of a thickened section in the middle and symmetrical thinner sections at both ends, it achieves a synergistic improvement in mechanical and corrosion resistance at the structural level. The overall structure is subjected to uniform stress, effectively enhancing the overall stability and deformation resistance of the pipe fitting, and avoiding the local stress concentration and structural damage that are prone to occur in traditional equal-diameter pipe fittings. The thickened design of the thickened section significantly strengthens the core load-bearing area of ​​the pipe fitting, and together with the symmetrical thinner sections of equal length at both ends, it ensures structural stability during assembly and use, reduces the risk of deformation under external forces, and extends the overall service life.

[0013] The annular groove structure on the outer wall effectively increases the anti-corrosion contact area, optimizes the electrochemical reaction interface, improves the sacrificial anode discharge efficiency and protection uniformity, avoids localized insufficient or overprotection issues, and makes the cathodic protection effect more stable and durable. The end positioning steps at both ends provide a precise positioning benchmark for assembly, effectively preventing installation misalignment, ensuring reliable connection between pipe fittings and supporting components, improving on-site construction efficiency and installation accuracy, and ensuring a stable and unobstructed current conduction path.

[0014] The axially diverging thin-rib structure on the inner wall of the tube significantly improves the axial strength and torsional and compressive resistance of the tube wall without significantly increasing the overall weight, strengthening the overall structural integrity and preventing problems such as cracking and deformation during use. The centrifugal casting process ensures smooth transitions and seamless connections between structural sections, eliminating weak points in traditional spliced ​​structures, improving structural density and electrical continuity, and guaranteeing stable electrochemical performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall assembly of the present utility model; Figure 2 This is a schematic diagram of the annular structure of the outer wall of this utility model; Figure 3 This is a schematic diagram of the end positioning step structure of this utility model; Figure 4 This is a schematic diagram of the axial thin rib structure of the inner wall of this utility model; Figure 5 This is a cross-sectional view of the internal structure of this utility model; In the figure: 1 is the tube body, 2 is the thickened section, 3 is the thin tube section at the left end, 4 is the thin tube section at the right end, 5 is the outer wall annular structure, 6 is the end positioning step, and 7 is the inner wall axial thin rib. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0018] like Figures 1 to 5As shown, a thickened anti-corrosion sacrificial anode discharge tube for oil pipelines includes a tube body 1, which is a coaxial integral structure. The tube body 1 includes a thickened section 2, a left-end thin tube section 3, and a right-end thin tube section 4. The wall thickness of the thickened section 2 is greater than the wall thickness of the left-end thin tube section 3 and the right-end thin tube section 4. The thickened section 2 is located between the left-end thin tube section 3 and the right-end thin tube section 4. The left-end thin tube section 3 and the right-end thin tube section 4 are of equal length and symmetrically arranged. The tube body 1 is integrally formed with the same axis as a reference. The thickened section 2 is located in the middle position. The left-end thin tube section 3 and the right-end thin tube section 4 have the same tube size and are arranged symmetrically from left to right. The thickened section 2 is thicker overall and bears the main structural strength and discharge function.

[0019] Preferably, it also includes an outer wall annular structure 5. The outer wall of the thickened section 2 is provided with an outer wall annular structure 5. The outer wall annular structure 5 is surrounded by a groove. The outer wall annular structure 5 is used to increase the anti-corrosion contact area and improve the protection effect. One or more continuous grooves are processed along the circumference on the outer surface of the thickened section 2 to form an outer wall annular structure 5, so that the anti-corrosion material is more fully attached to the anode surface and the electrochemical reaction contact area is increased.

[0020] Preferably, it also includes an end positioning step 6. The outer ends of the left end thin tube segment 3 and the right end thin tube segment 4 are both provided with end positioning steps 6. The end positioning steps 6 are used for installation positioning to prevent assembly misalignment. A radially protruding step structure is processed at the outermost position of the thin tube segments at both ends. During assembly, it can be directly snapped into the matching interface to achieve quick alignment and avoid skewing or misalignment during installation.

[0021] Preferably, it also includes an inner wall axial thin rib 7. The inner wall axial thin rib 7 is arranged along the axial direction inside the pipe wall of the pipe body 1. The inner wall axial thin rib 7 is radiating and is used to improve the strength and deformation resistance of the pipe body. Multiple radially distributed ribs are arranged along the length direction on the inner wall of the pipe body 1 to form the inner wall axial thin rib 7, which improves the overall resistance to compression and bending without significantly increasing the weight.

[0022] Preferably, the length of the thickened section 2 is one-fifth to one-quarter of the total length of the pipe body 1. The wall thickness of the thickened section 2 is two to three millimeters thicker than the wall thickness of the thinner pipe section 3 at the left end and the thinner pipe section 4 at the right end. The thickened section 2 is controlled within a reasonable length range so that it occupies an appropriate proportion of the middle section of the pipe body 1. At the same time, the wall thickness of the thickened section 2 is appropriately increased to achieve a balance between structural reinforcement and material cost.

[0023] Preferably, the tube body 1 is integrally formed by centrifugal casting, forming a seamless integrated structure. The thickened section 2, the thin tube section 3 at the left end, and the thin tube section 4 at the right end transition smoothly. The entire tube body 1 is formed in one go using centrifugal casting technology, with no welding or splicing between the sections. The connecting surfaces are smooth and rounded, ensuring structural integrity and electrical continuity.

[0024] The process involves sequentially forming a left-end thin tube segment 3, a thickened segment 2, and a right-end thin tube segment 4. The thickened segment 2 is located between the left-end thin tube segment 3 and the right-end thin tube segment 4. The left-end thin tube segment 3 and the right-end thin tube segment 4 maintain the same length and are symmetrically distributed. The wall thickness of the thickened segment 2 is greater than that of the left-end thin tube segment 3 and the right-end thin tube segment 4. All connection points are smoothly transitioned. An outer wall annular structure 5 is machined on the outer wall of the thickened segment 2. The outer wall annular structure 5 is set in the form of a surrounding groove to increase the anti-corrosion contact area and improve the sacrificial anode discharge and anti-corrosion protection effects. End positioning steps 6 are machined at the outer ends of the left-end thin tube segment 3 and the right-end thin tube segment 4, respectively. The end positioning steps 6 are used for precise positioning during assembly, avoiding misalignment during installation and ensuring docking stability.

[0025] Axial thin ribs 7 are machined along the inner wall of the pipe body 1. These ribs are evenly distributed in a divergent pattern to enhance the overall strength and deformation resistance of the pipe body 1, thereby improving structural reliability. The prepared discharge tube is transported to the construction site and quickly positioned and assembled using the end positioning step 6, allowing the pipe body 1 to be stably connected to the cathodic protection system of the oil pipeline. The thickened section 2, the outer wall annular structure 5, and the inner wall axial thin ribs 7 work together to achieve stable discharge and long-term corrosion protection.

[0026] The above description only details the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A thickened, corrosion-resistant sacrificial anode discharge tube for oil pipelines, characterized in that: The tube includes a tube body (1), which is a coaxial integral structure. The tube body (1) includes a thickened section (2), a left-end thin tube section (3), and a right-end thin tube section (4). The wall thickness of the thickened section (2) is greater than the wall thickness of the left-end thin tube section (3) and the right-end thin tube section (4). The thickened section (2) is located between the left-end thin tube section (3) and the right-end thin tube section (4). The left-end thin tube section (3) and the right-end thin tube section (4) are of equal length and are symmetrically arranged.

2. The thickened anti-corrosion sacrificial anode discharge tube for oil pipelines according to claim 1, characterized in that: It also includes an outer wall annular structure (5), the outer wall of the thickened section (2) is provided with the outer wall annular structure (5), the outer wall annular structure (5) is surrounded by a groove, the outer wall annular structure (5) is used to increase the anti-corrosion contact area and improve the protection effect.

3. The thickened anti-corrosion sacrificial anode discharge tube for oil pipelines according to claim 1, characterized in that: It also includes an end positioning step (6), and the outer ends of the left end thin tube segment (3) and the right end thin tube segment (4) are provided with the end positioning step (6). The end positioning step (6) is used for installation positioning to prevent assembly offset.

4. The thickened anti-corrosion sacrificial anode discharge tube for oil pipelines according to claim 1, characterized in that: It also includes axial thin ribs (7) on the inner wall. The inner wall of the tube body (1) is provided with axial thin ribs (7) along the axial direction. The axial thin ribs (7) are divergent and are used to improve the strength and deformation resistance of the tube body.

5. The thickened anti-corrosion sacrificial anode discharge tube for oil pipelines according to claim 1, characterized in that: The length of the thickened section (2) is one-fifth to one-quarter of the total length of the tube body (1), and the wall thickness of the thickened section (2) is two to three millimeters thicker than the wall thickness of the left end thin tube section (3) and the right end thin tube section (4).

6. The thickened anti-corrosion sacrificial anode discharge tube for oil pipelines according to claim 1, characterized in that: The tube body (1) is integrally formed by centrifugal casting, and is a seamless integrated structure. The thickened section (2), the left end thin tube section (3) and the right end thin tube section (4) are smoothly transitioned.

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