Rotatable corrosion coupon detection sampling device in oil and gas pipeline

Abstract

This invention relates to the field of corrosion monitoring technology for oil and gas pipelines, and more particularly to a rotatable corrosion detection and sampling device for oil and gas pipelines. The device includes a pipeline with a base welded to it via a flared weld. A protective cap is threaded onto the upper end of the base. An insert is located inside the base, and a support is connected to the lower end of the insert. A rotary joint is connected to the lower end of the support, and an extension frame is connected to the lower end of the rotary joint. An adjusting fixing piece is mounted on the extension frame, and a hanging piece is connected to the adjusting fixing piece. The extension frame and the support are connected via the rotary joint. This invention allows for flexible adjustment of the hanging piece angle and multi-dimensional corrosion monitoring, facilitates sampling, and makes it easy to adjust the posture of the extension frame and disassemble and assemble the hanging pieces, effectively simplifying its use.

Description

Technical Field

[0001] This invention relates to the field of corrosion monitoring technology for oil and gas pipelines, and in particular to a rotatable corrosion sampling device for detecting corrosion plates inside oil and gas pipelines. Background Technology

[0002] During the operation of oil and gas pipelines, internal media such as oil, gas, and water can corrode the pipeline's inner wall, severely impacting its service life and safe operation. Traditional corrosion monitoring systems with mounting brackets have the following shortcomings: the mounting bracket installation angle is difficult to match with the media flow direction, leading to inaccurate monitoring data; they cannot simultaneously monitor corrosion at different levels of the pipeline, such as the upper, middle, and lower sections, making it difficult to comprehensively reflect the pipeline's corrosion status; and sampling operations are inconvenient, hindering corrosion analysis of the media within the pipeline. Therefore, there is an urgent need for a corrosion monitoring system with mounting brackets that can flexibly adjust the bracket angle, monitor corrosion from multiple dimensions, and facilitate sampling. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by proposing a rotatable corrosion detection and sampling device for oil and gas pipelines.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a rotatable corrosion-resistant plate detection and sampling device for oil and gas pipelines, comprising a pipeline, a base welded to the pipeline in the form of a flared weld, a protective cap screwed onto the upper end of the base, a plug inside the base, a bracket connected to the lower end of the plug, a rotary joint connected to the lower end of the bracket, an extension frame connected to the lower end of the rotary joint, an adjusting plate on the extension frame, a plate connected to the adjusting plate, and the extension frame and the bracket connected by the rotary joint, allowing the extension frame to automatically rotate and position itself according to the flow direction of the medium in the pipeline, so that the plate is parallel to the flow direction of the medium. A sampling passage is connected to the side of the base, a valve is provided in the middle of the sampling passage, and a sampling port is fixedly connected to the end of the sampling passage. Both the sampling passage and the sampling port have medium flow passages inside.

[0005] Preferably, the base has a T-shaped bypass hole on its side, and the sampling passage is fixedly connected to the base through the T-shaped bypass hole. The base is made of 316L stainless steel.

[0006] Preferably, the insert includes an insert body, an insert nut, a main sealing gasket, an O-ring sealing gasket, a tube plug, a vent hole, and a fixing screw. The insert body is threaded into the interior of the base. The insert nut is threaded onto the lower end of the insert body and the fixing screw. The internal thread of the upper end of the bracket is screwed onto the insert nut. The O-ring sealing gasket and the main sealing gasket are fitted onto the insert body, with the O-ring sealing gasket positioned above the main sealing gasket. The O-ring sealing gasket and the main sealing gasket are tightly fitted into the interior of the base. A vent hole is provided inside the insert body. The tube plug is threaded onto the upper end of the insert body to seal the vent hole.

[0007] Preferably, the bracket is made of 316L stainless steel.

[0008] Preferably, the rotary joint includes a housing, a ratchet, a pawl, a first rotating shaft, a second rotating shaft, and a return spring. The two ends of the housing are respectively an internal thread and a groove. The external thread at the lower end of the bracket is screwed into the internal thread on the housing. The ratchet is located within the groove of the housing. The ratchet is connected to the housing via the first rotating shaft and can rotate relative to it. The lower part of the ratchet has an external thread, and the upper part has ratchet teeth. A threaded sleeve extends from the upper end of the extension bracket. The internal thread of the threaded sleeve is connected to the external thread of the ratchet. The pawl is connected to the housing via the second rotating shaft and can rotate relative to it. The pawl rests on the ratchet teeth of the ratchet. The return spring connects the pawl to a fixed post on the housing. A fixing nut is screwed through and tightened between the threaded sleeve and the lower part of the ratchet.

[0009] Preferably, the adjusting plate component includes an inner adjusting shell slidably installed inside the extension frame, and an inner adjusting frame slidably installed inside the inner adjusting shell. The lengths of the extension frame, the inner adjusting shell, and the inner adjusting frame increase sequentially. Two plate shells are symmetrically fixedly installed at the lower ends of the extension frame, the inner adjusting shell, and the inner adjusting frame. Two tenons extend symmetrically from the lower edge of the side of the plate shell. The tenons on the inner adjusting frame engage with the tenons on the hanging plate. An L-shaped pressure seat is elastically installed inside the plate shell. The L-shaped pressure seat extends through the side of the plate shell. The lower end face of the horizontal end of the L-shaped pressure seat is inclined. The horizontal end of the L-shaped pressure seat presses against the hanging plate.

[0010] Preferably, elastic rubber blocks are installed through the upper edges of the front and rear ends of the inner adjustment frame and the upper edges of the front and rear ends of the inner adjustment shell. Fixing slots are provided at the upper and lower edges of the inner front and rear ends of the inner adjustment shell and the upper and lower edges of the inner front and rear ends of the extension frame. Multiple rubber protrusions are evenly distributed and extended on the elastic rubber blocks. The cross-section of the rubber protrusions is triangular, and the rubber protrusions are engaged in the fixing slots above.

[0011] Preferably, two guide posts are slidably installed through the vertical end of the L-shaped pressure seat. The two ends of the guide posts are fixed to the inner wall of the solid shell. An ejector spring is wound around the outside of the guide posts. The two ends of the ejector spring are fixed to the inner wall of the L-shaped pressure seat and the solid shell, respectively.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Dynamic attitude adjustment: The ratchet and pawl structure of the rotary joint allows the extension frame to rotate automatically with the flow of the medium, ensuring that the hanging plate is parallel to the flow direction, reducing fluid resistance and improving the accuracy of corrosion monitoring data.

[0014] 2. Integrated sampling function: The medium inside the pipeline can be obtained through the sampling passage, valve and sampling port without the need for additional holes, reducing the risk of leakage and improving the convenience of operation.

[0015] 3. Multi-diameter adaptability: The posture of the extension frame can be adjusted to suit the layered monitoring of large-diameter pipelines, comprehensively covering the corrosion status at different locations of the pipeline cross-section.

[0016] 4. By pulling down the inner adjustment frame and inner adjustment shell inside the extension frame in sequence, the inner adjustment frame can extend out from the inner adjustment shell, and the inner adjustment shell can extend out from the extension frame, allowing it to unfold. Then, multiple hanging plates can be fixed to the end of the extension frame, the end of the inner adjustment shell, and the end of the inner adjustment frame in sequence. This allows the hanging plates to be suspended at the upper, middle, and lower positions of the pipeline, realizing corrosion monitoring at different heights on the same cross section, and comprehensively assessing the corrosion distribution on the inner wall of the pipeline. The process only requires pulling to change the posture of the extension frame, without the need for tools, making the operation simple and convenient to use.

[0017] 5. Align and insert the tenon on the hanging piece and the tenon on the fixed plate shell. At this time, the L-shaped pressure seat will enter the fixed plate shell under the push of the hanging piece. After the hanging piece is attached to the fixed plate shell, push the hanging piece downward to make the tenon and tenon on the hanging piece engage. At this time, the L-shaped pressure seat will extend again under the action of the ejection spring to press on the hanging piece and fix the hanging piece. Conversely, push the hanging piece upward with force. At this time, the L-shaped pressure seat will enter the fixed plate shell under its own inclined surface and the push of the hanging piece to loosen the pressure on the hanging piece. Then the hanging piece can be removed. The process can be completed by simply pushing the hanging piece. No tools are needed. The operation is simple and convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a rotatable corrosion detection and sampling device for oil and gas pipelines according to the present invention.

[0019] Figure 2 This is an internal view of a pipeline for a rotatable corrosion detection and sampling device for oil and gas pipelines according to the present invention.

[0020] Figure 3 This is a cross-sectional view of the insert body of a rotatable corrosion-resistant strip detection and sampling device for oil and gas pipelines according to the present invention.

[0021] Figure 4 This invention relates to a rotatable corrosion-detecting and sampling device for oil and gas pipelines. Figure 3 Enlarged view of A in the middle;

[0022] Figure 5 This invention relates to a rotatable corrosion-detecting and sampling device for oil and gas pipelines. Figure 3 Enlarged view of B in the middle;

[0023] Figure 6 This is a schematic diagram of the outer casing of a rotatable corrosion-resistant strip detection and sampling device for oil and gas pipelines according to the present invention.

[0024] Figure 7 This is a schematic diagram of the mounting plate of a rotatable corrosion detection and sampling device for oil and gas pipelines according to the present invention.

[0025] Figure 8 This invention relates to a rotatable corrosion-detecting and sampling device for oil and gas pipelines. Figure 7 Enlarged view of C;

[0026] Figure 9 This is an internal view of the solid shell of a rotatable corrosion-resistant strip detection and sampling device for oil and gas pipelines according to the present invention.

[0027] Figure 10 This is an internal view of the extension frame of a rotatable corrosion-resistant sampling device for detecting corrosion plates inside an oil and gas pipeline according to the present invention.

[0028] Figure 11 This invention relates to a rotatable corrosion-detecting and sampling device for oil and gas pipelines. Figure 10 Enlarged view of D;

[0029] Figure 12 This is an exploded view of the extension frame, inner adjusting shell, and inner adjusting frame of a rotatable corrosion-resistant strip detection and sampling device for oil and gas pipelines according to the present invention.

[0030] In the diagram: 1. Pipe; 2. Base; 3. Protective cover; 4. Bracket; 5. Inner adjusting shell; 6. Threaded sleeve; 7. Extension frame; 8. Hanging plate; 9. Fixing nut; 10. Sampling passage; 11. Valve; 12. Sampling port; 13. Insert body; 14. Insert nut; 15. Main sealing gasket; 16. O-ring sealing gasket; 17. Pipe plug; 18. Vent hole; 19. Fixing screw; 20. Outer shell; 21. Ratchet; 22. Pawl; 23. First rotating shaft; 24. Second rotating shaft; 25. Return spring; 26. Tenon; 27. Inner adjusting frame; 28. Fixed plate shell; 29. ​​L-shaped pressure seat; 30. Guide post; 31. Ejection spring; 32. Elastic rubber block; 33. Rubber protrusion; 34. Fixing slot. Detailed Implementation

[0031] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0032] like Figures 1-12 The diagram illustrates a rotatable corrosion detection and sampling device for oil and gas pipelines. It includes a pipeline 1, with a base 2 welded to the pipeline 1 via a flared weld. A protective cover 3 is threaded onto the upper end of the base 2, sealing the upper opening of the base 2 to prevent media leakage. An insert is located inside the base 2, with a bracket 4 connected to its lower end. The bracket 4 serves as a connector, and a rotary joint is connected to its lower end. An extension frame 7 is connected to the lower end of the rotary joint, and an adjusting plate is mounted on the extension frame 7. A hanging plate 8 is attached to the adjusting plate. Corrosion products adhere to the surface of the hanging plate 8. The device is activated by periodically removing the protective cover 3 and the insert. The main body 13 allows the removal of the hanging plate 8 for corrosion analysis. The extension frame 7 is connected to the support 4 via a rotary joint, allowing the extension frame 7 to automatically rotate and position itself according to the flow direction of the medium in the pipeline 1, so that the hanging plate 8 is parallel to the flow direction of the medium. The side of the base 2 is connected to a sampling passage 10, and a valve 11 is installed in the middle of the sampling passage 10. A sampling port 12 is fixedly connected to the end of the sampling passage 10. Both the sampling passage 10 and the sampling port 12 have medium flow passages inside. When sampling the medium, the valve 11 is opened, and the medium in the pipeline 1 flows out from the sampling port 12 through the sampling passage 10 and is connected to the sampling bottle or analysis equipment. After sampling is completed, the valve 11 is closed to prevent medium leakage.

[0033] The base 2 has a T-shaped bypass hole on its side. The sampling passage 10 is fixedly connected to the base 2 through the T-shaped bypass hole. The T-shaped bypass hole facilitates the connection between the base 2 and the sampling passage 10. The base 2 is made of 316L stainless steel.

[0034] The insert assembly includes an insert body 13, an insert nut 14, a main sealing gasket 15, an O-ring sealing gasket 16, a tube plug 17, a vent hole 18, and a fixing screw 19. The insert body 13 is threaded into the interior of the base 2. The insert nut 14 is threaded onto the lower end of the insert body 13 and fixed to the fixing screw 19. The fixing screw 19 reinforces the insert nut 14. The internal thread at the upper end of the bracket 4 is screwed onto the insert nut 14. The insert nut 14 secures the bracket 4. The O-ring gasket 16 and the main gasket 15 are connected to the insert body 13. The O-ring gasket 16 is located above the main gasket 15. The O-ring gasket 16 and the main gasket 15 are tightly packed inside the base 2. The cooperation of the O-ring gasket 16 and the main gasket 15 can achieve a two-stage seal. The insert body 13 has a vent hole 18 inside. The plug 17 is threaded onto the upper end of the insert body 13 to seal the vent hole 18.

[0035] The bracket 4 is made of 316L stainless steel.

[0036] The rotary joint includes a housing 20, a ratchet 21, a pawl 22, a first rotating shaft 23, a second rotating shaft 24, and a return spring 25. The two ends of the housing 20 are internal threads and grooves, respectively. The external thread at the lower end of the bracket 4 is screwed into the internal thread on the housing 20. The housing 20 serves to support the ratchet 21 and pawl 22. The ratchet 21 is located in the groove of the housing 20. The ratchet 21 is connected to the housing 20 via the first rotating shaft 23 and can rotate relative to it. The first rotating shaft 23 connects to the ratchet 21. The lower part of the ratchet 21 has external threads, and the upper part has ratchet teeth. The upper end of the extension bracket 7 extends with a threaded section. The threaded sleeve 6 has its internal thread connected to the external thread of the ratchet 21. The threaded sleeve 6 connects the extension frame 7 and the ratchet 21. The pawl 22 is connected to the outer shell 20 via the second rotating shaft 24 and can rotate relative to it. The second rotating shaft 24 connects the pawl 22. The pawl 22 rests on the ratchet teeth of the ratchet 21. The return spring 25 connects the pawl 22 to the fixed post on the outer shell 20. The return spring 25 engages the pawl 22 and the ratchet teeth of the ratchet 21. A fixing nut 9 is screwed through the threaded sleeve 6 and the lower part of the ratchet 21 for reinforcement.

[0037] The adjusting plate component includes an inner adjusting shell 5 slidably installed inside the extension frame 7. An inner adjusting frame 27 is slidably installed inside the inner adjusting shell 5. The lengths of the extension frame 7, the inner adjusting shell 5, and the inner adjusting frame 27 increase sequentially. Two plate shells 28 are symmetrically fixedly installed at the lower ends of the extension frame 7, the inner adjusting shell 5, and the inner adjusting frame 27. The plate shells 28 serve to support the L-shaped pressure seat 29. Two tenons 26 extend symmetrically from the lower edge of the side of the plate shell 28. The tenons 26 on the inner adjusting frame 27 engage with the mortises on the hanging plate 8, thus restricting the hanging plate 8. An L-shaped pressure seat 29 is elastically installed inside the plate shell 28. The L-shaped pressure seat 29 extends through the side of the plate shell 28. The lower end face of the horizontal end of the L-shaped pressure seat 29 is set at an angle. The horizontal end of the L-shaped pressure seat 29 presses against the hanging plate 8, ensuring that the tenons 26 and the mortises on the hanging plate 8 do not separate.

[0038] Elastic rubber blocks 32 are installed through the upper edges of the front and rear ends of the inner adjustment frame 27 and the upper edges of the front and rear ends of the inner adjustment shell 5. Fixing slots 34 are provided at the upper and lower edges of the front and rear ends of the inner adjustment shell 5 and the upper and lower edges of the front and rear ends of the extension frame 7. Multiple rubber protrusions 33 are evenly distributed and extended on the elastic rubber blocks 32. The cross-section of the rubber protrusions 33 is triangular. The rubber protrusions 33 are engaged in the fixing slots 34 above, which can fix the extension frame 7, the inner adjustment shell 5, and the inner adjustment frame 27. When the inner adjustment shell 5 and the inner adjustment frame 27 are pulled, the rubber protrusions 33 on the elastic rubber blocks 32 will deform and disengage from the fixing slots 34, allowing the inner adjustment shell 5 and the inner adjustment frame 27 to move normally. When they move to the fixing slots 34 again, the rubber protrusions 33 will re-engage with them to achieve automatic fixation.

[0039] Two guide posts 30 are slidably installed through the vertical end of the L-shaped pressure seat 29. The two ends of the guide posts 30 are fixed to the inner wall of the solid shell 28. The guide posts 30 serve to guide the L-shaped pressure seat 29. An ejector spring 31 is wound around the outside of the guide posts 30. The two ends of the ejector spring 31 are fixed to the inner wall of the L-shaped pressure seat 29 and the solid shell 28, respectively. The ejector spring 31 serves to eject the L-shaped pressure seat 29.

[0040] In use, the base 2 is welded to the preset position of the pipe 1 through the flared end, ensuring a tight weld. Then, the two ends of the bracket 4, the insert nut 14 on the insert body 13, and the outer shell 20 are tightened. Next, the threaded sleeve 6 on the extension bracket 7 and the lower part of the ratchet 21 are tightened, and the fixing nut 9 is screwed between the threaded sleeve 6 and the ratchet 21 for reinforcement. Then, the tenon groove on the hanging piece 8 and the tenon tongue 26 on the inner adjusting bracket 27 are aligned and inserted. At this time, the L-shaped pressure seat 29 is in place on the hanging piece. Pushed by 8, it enters the solid shell 28. After the hanging piece 8 is attached to the solid shell 28, it is pushed down to make the tenon and tongue 26 on the hanging piece 8 engage. At this time, the L-shaped pressure seat 29 extends again under the action of the ejection spring 31 to press on the hanging piece 8 and fix the hanging piece 8. Then the insert body 13 can be screwed into the base 2 to complete the installation. When the medium in the pipe 1 flows, the extension bracket 7 rotates through the rotary joint under the action of hydrodynamic force, and the pawl 22 moves along the ratchet 21. Slide the plate 8 until it is parallel to the medium flow direction to achieve automatic posture adjustment, allowing the plate 8 to fully contact the medium. Corrosion products adhere to the surface of the plate 8. By periodically disassembling the protective cover 3 and the insert body 13, the plate 8 can be removed for corrosion analysis. When sampling the medium, open the valve 11. The medium in the pipeline 1 flows out from the sampling port 12 through the sampling passage 10 and is connected to the sampling bottle or analysis equipment. After sampling is completed, close the valve 11 to prevent medium leakage. When inspecting a large-diameter pipeline 1, the inner adjustment frame 27 and the inner adjustment shell 5 inside the extension frame 7 can be pulled down in sequence to allow the inner adjustment frame 27 to extend from the inner adjustment shell 5 and the inner adjustment shell 5 to extend from the extension frame 7, allowing them to unfold. Then, multiple plates 8 can be fixed to the end of the extension frame 7, the end of the inner adjustment shell 5, and the end of the inner adjustment frame 27 in sequence. This allows the plates 8 to be suspended at the upper, middle, and lower positions of the pipeline 1, enabling corrosion monitoring at different heights on the same cross section and comprehensively assessing the corrosion distribution on the inner wall of the pipeline 1.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A rotatable corrosion detection and sampling device for oil and gas pipelines, comprising a pipeline (1), characterized in that: The pipe (1) is welded with a base (2) in the form of a flared welding. The upper end of the base (2) is screwed with a protective cover (3). The base (2) is provided with a plug. The lower end of the plug is connected to a bracket (4). The lower end of the bracket (4) is connected to a rotary joint. The lower end of the rotary joint is connected to an extension frame (7). The extension frame (7) is provided with an adjusting plate. The adjusting plate is connected to a hanging plate (8). The extension frame (7) and the bracket (4) are connected by a rotary joint. The extension frame (7) can be automatically rotated and positioned according to the flow direction of the medium in the pipe (1) so that the hanging plate (8) is parallel to the flow direction of the medium. The side of the base (2) is connected to a sampling passage (10). The middle of the sampling passage (10) is provided with a valve (11). The end of the sampling passage (10) is fixedly connected to a sampling port (12). The sampling passage (10) and the sampling port (12) both have a medium flow passage inside. The rotary joint includes a housing (20), a ratchet (21), a pawl (22), a first rotating shaft (23), a second rotating shaft (24), and a return spring (25). The two ends of the housing (20) are an internal thread and a groove, respectively. The external thread at the lower end of the bracket (4) is screwed into the internal thread on the housing (20). The ratchet (21) is located in the groove of the housing (20). The ratchet (21) is connected to the housing (20) through the first rotating shaft (23) and can rotate relative to it. The lower part of the ratchet (21) is an external thread. The upper part of the extension frame (7) has a threaded sleeve (6) extending from the upper end. The internal thread of the threaded sleeve (6) is connected to the external thread of the ratchet (21). The pawl (22) is connected to the outer shell (20) through the second rotating shaft (24) and can rotate relative to it. The pawl (22) rests on the ratchet teeth of the ratchet (21). The return spring (25) connects the pawl (22) to the fixed post on the outer shell (20). A fixing nut (9) is screwed through between the threaded sleeve (6) and the lower part of the ratchet (21). The adjusting plate component includes an inner adjusting shell (5) that is slidably installed inside the extension frame (7). An inner adjusting frame (27) is slidably installed inside the inner adjusting shell (5). The lengths of the extension frame (7), the inner adjusting shell (5), and the inner adjusting frame (27) increase sequentially. Two plate shells (28) are symmetrically fixedly installed at the lower ends of the extension frame (7), the inner adjusting shell (5), and the inner adjusting frame (27). Two tenons (26) extend symmetrically from the lower edge of the side of the plate shell (28). The tenons (26) on the inner adjusting frame (27) engage with the tenons on the hanging plate (8). An L-shaped pressure seat (29) is elastically installed inside the plate shell (28). The L-shaped pressure seat (29) extends through the side of the plate shell (28). The lower end face of the horizontal end of the L-shaped pressure seat (29) is inclined. The horizontal end of the L-shaped pressure seat (29) is pressed against the hanging plate (8).

2. The rotatable corrosion detection and sampling device for oil and gas pipelines according to claim 1, characterized in that: The base (2) has a T-shaped bypass hole on its side. The sampling passage (10) is fixedly connected to the base (2) through the T-shaped bypass hole. The base (2) is made of 316L stainless steel.

3. The rotatable corrosion detection and sampling device for oil and gas pipelines according to claim 1, characterized in that: The plug assembly includes a plug body (13), a plug nut (14), a main sealing gasket (15), an O-ring sealing gasket (16), a tube plug (17), a vent hole (18), and a fixing screw (19). The plug body (13) is threaded into the interior of the base (2). The plug nut (14) is threaded onto the lower end of the plug body (13) and the fixing screw (19). The internal thread at the upper end of the bracket (4) is threaded onto the plug nut (14). Tighten the O-ring gasket (16) and the main gasket (15) onto the insert body (13). The O-ring gasket (16) is located above the main gasket (15). The O-ring gasket (16) and the main gasket (15) are tightly packed inside the base (2). The insert body (13) has a vent hole (18) inside. The plug (17) is threaded onto the upper end of the insert body (13) to seal the vent hole (18).

4. The rotatable corrosion detection and sampling device for oil and gas pipelines according to claim 1, characterized in that: The bracket (4) is made of 316L stainless steel.

5. The rotatable corrosion detection and sampling device for oil and gas pipelines according to claim 1, characterized in that: Elastic rubber blocks (32) are installed through the upper edges of the front and rear ends of the inner adjustment frame (27) and the upper edges of the front and rear ends of the inner adjustment shell (5). Fixed slots (34) are provided at the upper and lower edges of the front and rear ends of the inner adjustment shell (5) and the upper and lower edges of the front and rear ends of the extension frame (7). Multiple rubber protrusions (33) are evenly distributed on the elastic rubber block (32). The cross-section of the rubber protrusions (33) is triangular. The rubber protrusions (33) are engaged in the fixed slots (34) above.

6. The rotatable corrosion detection and sampling device for oil and gas pipelines according to claim 5, characterized in that: Two guide posts (30) are slidably installed through the vertical end of the L-shaped pressure seat (29). The two ends of the guide posts (30) are fixed to the inner wall of the solid shell (28). An ejector spring (31) is wound around the outside of the guide posts (30). The two ends of the ejector spring (31) are fixed to the inner wall of the L-shaped pressure seat (29) and the solid shell (28), respectively.

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