Corrosion resistant pressure pipe

Abstract

The utility model discloses a kind of corrosion-resistant pressure pipelines, it relates to pressure pipeline technical field, specifically a kind of corrosion-resistant pressure pipeline, including pipeline, flange, the pipeline is composed of base layer, transition layer and complex layer, the base layer is the outermost layer of pipeline, the transition layer is the middle layer of pipeline, the complex layer is the innermost layer of pipeline, the transition layer is fixedly connected with base layer and complex layer by hot melting, the flange is composed of recessed flange and tab flange, the recessed flange is fixedly connected in pipeline left end, the tab flange is fixedly connected in pipeline right end, flange outside remains pipeline connecting hole. By the setting of pipeline, make the corrosion-resistant pressure pipeline have the effect of giving consideration to high-strength pressure performance and long-acting anticorrosion ability, by the cooperation setting of base layer, transition layer and complex layer, reach the purpose of prolonging pipeline service life in petrochemical industry, marine engineering and other strong corrosion working conditions, reduce later maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of pressure pipeline technology, specifically a corrosion-resistant pressure pipeline. Background Technology

[0002] Pressure pipelines are core transportation equipment in industries such as petroleum, chemical, and natural gas. They are responsible for the transmission of fluid media such as oil, gas, and chemicals. Their safety is directly related to production safety and environmental protection. With the acceleration of industrialization, these pipelines are increasingly used in complex working conditions such as high temperature and high pressure, becoming a key infrastructure for the stable operation of industrial systems.

[0003] Ordinary pressure pipelines are susceptible to electrochemical corrosion, stress corrosion, and other effects. Every year, pipeline corrosion causes huge losses globally and can easily lead to accidents such as leaks and pollution. In harsh environments such as marine engineering and chemical industries, corrosion problems are even more prominent. Therefore, corrosion-resistant pressure pipelines have emerged.

[0004] Existing corrosion-resistant pipes are prone to defects such as cracks during welding, and the heat-affected zone is difficult to treat. Joints are prone to leakage under high pressure, and temperature fluctuations can cause stress concentration leading to failure. Detection technology is difficult to accurately locate internal defects, and environmental adaptability and service life need to be improved. Utility Model Content

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a corrosion-resistant pressure pipeline, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a corrosion-resistant pressure pipeline, comprising a pipeline and a flange. The pipeline consists of a base layer, a transition layer, and a cladding layer. The base layer is the outermost layer of the pipeline, the transition layer is the middle layer of the pipeline, and the cladding layer is the innermost layer of the pipeline. The transition layer is used to fix the base layer and the cladding layer together by heat fusion. The flange consists of a grooved flange and a protruding flange. The grooved flange is fixedly connected to the left end of the pipeline, and the protruding flange is fixedly connected to the right end of the pipeline. A pipeline connection hole is provided on the outer side of the flange.

[0007] Optionally, the thickness of the base layer in the pipeline accounts for 65%-75%, the thickness of the transition layer in the pipeline accounts for 5%-10%, and the thickness of the cladding layer in the pipeline accounts for 15%-20%.

[0008] Optionally, the base layer of the pipe is made of Q355B low-alloy steel, the transition layer of the pipe is made of nickel-based alloy powder, and the cladding layer of the pipe is made of modified PTFE ceramic composite coating.

[0009] Optionally, a modified PTFE sealing ring is provided on the outside of the grooved flange, and a metal toothed gasket is provided on the inside of the grooved flange.

[0010] Optionally, an ultrasonic sensor is provided on the inner side of the cascade layer in the pipe, and an optical fiber sensing line is provided in the transition layer in the pipe.

[0011] Optionally, an audible and visual alarm is installed on the outside of the pipe, and the audible and visual alarm is electrically connected to an ultrasonic wave sensor and an optical fiber sensing line, respectively.

[0012] (III) Beneficial Effects This utility model provides a corrosion-resistant pressure pipe, which has the following beneficial effects: 1. This corrosion-resistant pressure pipeline, through its design, achieves a balance between high-strength pressure resistance and long-term corrosion resistance. The combination of a base layer, transition layer, and cladding layer allows the base layer to bear system pressure, the transition layer to eliminate the risk of interlayer electrochemical corrosion, and the cladding layer to isolate the pipeline from direct contact with highly corrosive media. This simultaneously ensures the stability of the pipeline structure and the durability of its inner wall corrosion resistance, extending the pipeline's service life in highly corrosive conditions such as petrochemical and marine engineering applications, and reducing subsequent maintenance costs.

[0013] 2. This corrosion-resistant pressure pipeline, through the fixed connection between the base layer and the cladding layer, achieves the effect of no interlayer peeling and stable integrated structure. During use, it can resist the interlayer stress caused by media impact and temperature fluctuations, while avoiding the risk of crevice corrosion. It ensures that the pressure-bearing function of the base layer and the anti-corrosion function of the cladding layer are not disconnected, thus playing a role in simultaneously ensuring the mechanical safety and corrosion resistance of the pipeline. It achieves the goal of long-term stable operation under strong corrosion and high pressure conditions and reducing the frequency of pipeline maintenance.

[0014] 3. This corrosion-resistant pressure pipeline, through the combination of modified PTFE sealing rings and metal toothed gaskets, achieves a double-seal effect, adaptable to multiple working conditions and preventing leakage. During use, the modified PTFE sealing rings prevent the penetration of highly corrosive media, while the metal toothed gaskets enhance the pressure resistance and fit of the sealing surface. Even under temperature fluctuations or pressure shocks, the seal is not prone to failure, thus preventing media leakage at the connection points, avoiding corrosion spread and safety risks. This ensures the long-term safe operation of the pipeline in scenarios such as acid and alkali transportation and sulfur-containing oil and gas, and reduces downtime and maintenance costs caused by sealing problems.

[0015] 4. This corrosion-resistant pressure pipeline, through the combined use of ultrasonic sensors and fiber optic sensing lines, enables real-time dual-dimensional monitoring and early warning of risks. During operation, the ultrasonic sensors accurately track the attenuation of the composite layer thickness, while the fiber optic sensing lines capture real-time changes in pipeline temperature and stress. When the data exceeds the safety threshold, an automatic warning is triggered, thus identifying potential faults such as corrosion penetration and stress cracking in advance. This helps prevent sudden pipeline leaks or structural failures, ensuring continuous pipeline operation under highly corrosive conditions and reducing unplanned downtime losses. Attached Figure Description

[0016] Figure 1 This is a first sectional view of the present invention; Figure 2 This utility model Figure 1 Enlarged view of point A in the middle; Figure 3 This is a structural diagram of the present utility model; Figure 4 This is a second sectional view of the present invention; Figure 5 This is a flowchart illustrating the working process of the audible and visual alarm device of this utility model.

[0017] In the diagram: 1. Pipe; 11. Base layer; 12. Transition layer; 121. Fiber optic sensor line; 13. Multilayer layer; 131. Ultrasonic sensor; 14. Audible and visual alarm; 2. Flange; 21. Grooved flange; 211. Modified PTFE sealing ring; 212. Metal toothed gasket; 22. Raised flange; 23. Pipe connection hole. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figures 1 to 4This utility model provides a corrosion-resistant pressure pipeline, comprising a pipeline 1 and a flange 2. The pipeline 1 consists of a base layer 11, a transition layer 12, and a cladding layer 13. The base layer 11 is the outermost layer of the pipeline 1, the transition layer 12 is the middle layer of the pipeline 1, and the cladding layer 13 is the innermost layer of the pipeline 1. The transition layer 12 fixes the base layer 11 and the cladding layer 13 together by heat fusion. The flange 2 consists of a grooved flange 21 and a raised flange 22. The grooved flange 21 is fixedly connected to the left end of the pipeline 1, and the raised flange 22 is fixedly connected to the right end of the pipeline 1. A pipeline connection hole 23 is provided on the outer side of the flange 2. By setting up pipe 1, the corrosion-resistant pressure pipeline achieves both high-strength pressure resistance and long-term corrosion resistance. Through the coordinated arrangement of base layer 11, transition layer 12 and cladding layer 13, the base layer can bear the system pressure, the transition layer can eliminate the risk of interlayer electrochemical corrosion, and the cladding layer can isolate the direct contact of strong corrosive media during use. This ensures both the stability of the pipeline structure and the corrosion resistance and durability of the inner wall, thereby extending the service life of the pipeline in highly corrosive conditions such as petrochemical and marine engineering and reducing the later maintenance costs. The thickness of the base layer 11 in pipeline 1 accounts for 65%-75%, the thickness of the transition layer 12 in pipeline 1 accounts for 5%-10%, and the thickness of the cladding layer 13 in pipeline 1 accounts for 15%-20%. The material of the base layer 11 in pipeline 1 is Q355B low-alloy steel, the material of the transition layer 12 in pipeline 1 is nickel-based alloy powder, and the material of the cladding layer 13 in pipeline 1 is modified PTFE ceramic composite coating. Through the fixed connection between the base layer 11 and the cladding layer 13, the corrosion-resistant pressure pipeline has the effect of no interlayer peeling and stable integrated structure. During use, it can resist the interlayer stress caused by media impact and temperature fluctuation, while avoiding the risk of crevice corrosion. It ensures that the pressure-bearing function of the base layer 11 and the anti-corrosion function of the cladding layer 13 are not disconnected, thus playing a role in simultaneously ensuring the mechanical safety and corrosion resistance of the pipeline. It achieves the goal of long-term stable operation under strong corrosion and high pressure conditions and reducing the frequency of pipeline maintenance. A modified PTFE sealing ring 211 is provided on the outside of the grooved flange 21, and a metal toothed gasket 212 is provided on the inside of the grooved flange 21. Through the cooperation of the modified PTFE sealing ring 211 and the metal toothed gasket 212, the corrosion-resistant pressure pipeline has the effect of double sealing and leakage prevention under multiple working conditions. During use, the modified PTFE sealing ring 211 can prevent the penetration of strong corrosive media, and the metal toothed gasket 212 can enhance the pressure resistance and fit of the sealing surface. Even when faced with temperature fluctuations or pressure shocks, the seal is not easy to fail. This plays a role in preventing media leakage at the connection point, avoiding corrosion spread and safety risks, and achieving the goal of ensuring the long-term safe operation of the pipeline in acid and alkali transportation, sulfur-containing oil and gas and other scenarios, and reducing downtime maintenance costs caused by sealing problems. An ultrasonic sensor 131 is installed inside the cladding layer 13 of pipe 1, and an optical fiber sensor 121 is installed inside the transition layer 12 of pipe 1. The ultrasonic sensor 131 is an ET410, and the optical fiber sensor 121 is a Beinuo BFG-300. An audible and visual alarm 14 is installed on the outside of pipe 1. The audible and visual alarm 14 is electrically connected to the ultrasonic sensor 131 and the optical fiber sensor 121, respectively. Through the coordinated setup of the ultrasonic sensor 131 and the optical fiber sensor 121, the corrosion-resistant pressure pipe has the effect of real-time dual-dimensional monitoring and early warning of risks. During use, the ultrasonic sensor 131 can accurately track the attenuation of the cladding layer thickness, and the optical fiber sensor 121 can capture changes in pipe temperature and stress in real time. When the data exceeds the safety threshold, an early warning is automatically triggered, thereby playing a role in early identification of potential faults such as corrosion penetration and stress cracking, avoiding sudden leakage or structural failure of the pipe, and achieving the purpose of ensuring continuous operation of the pipe under strong corrosion conditions and reducing unplanned downtime losses.

[0020] During use, corrosive fluids such as sulfur-containing media in petrochemicals and acid / alkali wastewater enter the interior of pipeline 1. The base layer 11 initially bears the system pressure. Due to the high strength of the material of the base layer 11, it can withstand the pressure impact during fluid transportation. At the same time, through the overall structural stability of the pipeline, it ensures that the fluid is transported at a uniform speed along the preset path, avoiding pipeline deformation or rupture due to pressure overload. During the fluid movement inside pipeline 1, the transition layer 12 can block the conduction of corrosion current between the base layer 11 and the cladding layer 13, while buffering the interlayer thermal stress caused by fluid temperature fluctuations, preventing the base layer 11 and the cladding layer 13 from peeling off due to their different coefficients of thermal expansion, thus ensuring the structural integrity of pipeline 1. The cladding layer 13, which is in contact with the fluid, can completely isolate the corrosive media from contact with the base layer 11. Furthermore, the modified PTEFE ceramic composite coating avoids the scouring and wear of the inner wall by high-velocity fluids, and the upper temperature resistance limit is increased to 300℃, making it suitable for the transportation of high-temperature corrosive media. To ensure that the anti-corrosion performance does not degrade during long-term use, the design of grooved flange 21 and raised flange 22 at the connection of pipe 1 allows the sealing surface of flange 2 to fit precisely, reducing gap space. The modified PTFE sealing ring 211 directly contacts the corrosive medium, blocking the medium penetration. The metal toothed gasket 212 fits tightly against the flange surface under pressure, maintaining sealing performance even when pressure fluctuates or temperature changes, achieving zero-leakage transportation. Ultrasonic sensors 131 are installed at intervals on the inner wall of the pipe to scan the thickness of the cladding layer 13 in real time. When the thickness decreases by 20% due to corrosion, the data is immediately transmitted to the control system. The fiber optic sensing line 121 installed in the transition layer 12 synchronously monitors the temperature distribution and stress changes of the pipe. If the local temperature is too high or the stress is concentrated, the system automatically triggers the audible and visual alarm 14 to remind maintenance personnel to check in time and avoid safety accidents such as leakage and cracking caused by corrosion or stress overload.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A corrosion-resistant pressure pipeline, comprising a pipeline (1) and a flange (2), characterized in that: The pipe (1) is composed of a base layer (11), a transition layer (12) and a cladding layer (13). The base layer (11) is the outermost layer of the pipe (1), the transition layer (12) is the middle layer of the pipe (1), and the cladding layer (13) is the innermost layer of the pipe (1). The transition layer (12) is used to fix the base layer (11) and the cladding layer (13) together by heat fusion. The flange (2) is composed of a groove flange (21) and a bump flange (22). The groove flange (21) is fixedly connected to the left end of the pipe (1), and the bump flange (22) is fixedly connected to the right end of the pipe (1). The flange (2) has a pipe connection hole (23) on the outside.

2. The corrosion-resistant pressure pipeline according to claim 1, characterized in that: The thickness of the base layer (11) in the pipe (1) is 65%-75%, the thickness of the transition layer (12) in the pipe (1) is 5%-10%, and the thickness of the cladding layer (13) in the pipe (1) is 15%-20%.

3. The corrosion-resistant pressure pipeline according to claim 1, characterized in that: The base layer (11) of the pipe (1) is made of Q355B low alloy steel, the transition layer (12) of the pipe (1) is made of nickel-based alloy powder, and the cladding layer (13) of the pipe (1) is made of modified PTFE ceramic composite coating.

4. The corrosion-resistant pressure pipeline according to claim 1, characterized in that: A modified PTFE sealing ring (211) is provided on the outside of the grooved flange (21), and a metal toothed gasket (212) is provided on the inside of the grooved flange (21).

5. A corrosion-resistant pressure pipeline according to claim 1, characterized in that: An ultrasonic sensor (131) is provided inside the inner layer (13) of the pipe (1), and an optical fiber sensing line (121) is provided inside the transition layer (12) of the pipe (1).

6. The corrosion-resistant pressure pipeline according to claim 1, characterized in that: An audible and visual alarm (14) is installed on the outside of the pipe (1), and the audible and visual alarm (14) is electrically connected to the ultrasonic wave sensor (131) and the optical fiber sensing line (121) respectively.

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