A method for evaluating failure of high-grade steel pipelines

Abstract

The application provides a high-steel-grade pipeline failure evaluation method, which comprises the following steps: comparing data: collecting parameters of previous high-steel-grade pipeline failure cases and distinguishing according to the use and production path of the high-steel-grade pipeline; pipeline weld detection: wrapping the welds of two groups of high-steel-grade pipeline bodies by a weld detection assembly and scanning the circular welds in a surrounding rotating manner to obtain parameters of the welds; pipeline surface stress detection: contacting a probe rod with the surface of the pipeline and translating along the surface of the pipeline, and analyzing collected data to obtain the area and parameters of stress generation; the weld part is detected in a surrounding manner by the weld detection assembly, and then the surface of the pipeline is detected by the probe rod in a translational manner, both detections are installed at the bottom of the top frame, and the two detection modes do not interfere with the movement of each other, so that the evaluation of the failure degree of the pipeline is more convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of high-strength steel pipeline evaluation technology, specifically a method for evaluating the failure of high-strength steel pipelines. Background Technology

[0002] High-strength steel pipe circumferential welds are a typical welded structure, whose local material composition can be mainly divided into the base material, the weld, and the heat-affected zone (HAZ). Due to the high strength of the base material in high-strength steel pipes, circumferential welds are prone to low-strength matching, unlike the high-strength matching of circumferential welds in lower-strength steel pipes. Low-strength matching is one of the main causes of localized stress or strain concentration in pipe circumferential welds. Welding defects, poor weld toughness, variable wall thickness or misalignment, and additional external loads can further exacerbate the localized stress or strain concentration in the circumferential weld. These factors are the main reasons for the frequent occurrence of circumferential weld accidents in high-strength steel pipes in recent years.

[0003] Currently, the assessment of failure severity of high-strength steel pipelines is typically based on factors such as circumferential weld joints, fracture evaluation, and strain bearing capacity. Existing technologies for weld inspection usually involve irradiating the weld with X-rays. The different absorption and scattering effects of the material on the X-rays result in varying photosensitive properties on the film, creating images of varying density on the film. This is used to determine whether there are internal defects in the weld. Strain bearing capacity is usually assessed using ultrasonic testing. In practice, these two tests are often performed separately, which affects the efficiency of parameter acquisition for high-strength steel pipelines and consequently impacts the determination of their failure severity. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a method for assessing the failure of high-strength steel pipelines, thereby solving the problems mentioned in the background art. The method involves using a weld inspection component to perform a circumferential inspection of the weld area, followed by a translational inspection of the pipeline surface using a probe. Both inspection methods are installed at the bottom of the top frame, improving parameter extraction efficiency. Furthermore, the two inspection modes do not interfere with each other's movement, making the assessment of pipeline failure more convenient and efficient.

[0005] To achieve the above objectives, the present invention provides a failure assessment method for high-strength steel pipelines, the assessment method comprising the following steps:

[0006] S1. Comparative Data: Statistically analyze the parameters of past failed high-strength steel pipe cases and differentiate them according to the purpose and production process of the high-strength steel pipes;

[0007] S2. Pipeline weld inspection: The weld inspection component is wrapped around the weld of two sets of high-strength steel pipe bodies and scans the circular weld in a rotating manner to obtain the parameters of the weld.

[0008] S3. Pipeline surface stress detection: By contacting the pipeline surface with a probe and moving it along the pipeline surface, the collected data can be analyzed to determine the area and parameters of stress generation.

[0009] S4. Analysis and Comparison: After the collected pipeline data is entered into the system, it is compared with the parameters of the original classification. It is also compared with the parameters of high-grade steel pipelines that have failed according to the same purpose and production method. The results are obtained to determine whether the pipeline is higher or lower than the parameters of the failed high-grade steel pipelines, thereby assessing whether the pipeline has failed.

[0010] Furthermore, the parameters for previous high-strength steel pipe failure cases in step S1 include: weld parameters of pipe failure, surface and internal stress parameters of pipe failure, and pipe material.

[0011] Furthermore, in step S1, when statistically analyzing the parameters of previous failed high-strength steel pipe cases, it is necessary to differentiate them according to the purpose and production process of the high-strength steel pipes and establish different databases. Each category requires multiple sets of data to be averaged. The average value is compared with the data collected from the pipe to be evaluated to determine whether the pipe has failed. If the average value is close to or less than the average value, it is considered to be failed. If the collected data is greater than the average value, it is considered not to be failed.

[0012] Furthermore, in step S2, the weld inspection component is inspected by a drive motor at both ends of the arc frame of the weld inspection component, which drives the moving wheels to rotate. The drive wheels travel along the outer surface of the high-grade steel pipe body, and the arc frame, wedge block, and X-ray end rotate along the surface of the weld. At least one end of the arc frame is kept in contact with the slide rail for limiting, thereby scanning and inspecting the weld area through the X-ray end.

[0013] Furthermore, in step S3, stress detection is performed by rotating the screw driven by the motor, with the moving block engaging with the screw and sliding along the moving groove. The probe moves horizontally along the surface of the high-strength steel pipe body and detects the stress on the surface of the high-strength steel pipe body. The movement path of the probe covers the entire cross-section of the high-strength steel pipe body.

[0014] Furthermore, before the weld inspection assembly is inspected, the third electric push rod is retracted and not connected to the socket, and the position of the third electric push rod is set so as not to interfere with the rotation of the wedge and the ray end.

[0015] Furthermore, before stress testing, the third electric push rod is inserted into the insertion hole of the side plate, and the moving plate is raised by the first electric push rod until the movement of the probe is not interfered with by the arc frame, and the notch of the top frame corresponding to the position of the moving plate can accommodate the arc frame to pass through.

[0016] Furthermore, before the weld inspection assembly is inspected, the second electric push rod drives the vertical frame close to the high-grade steel pipe body, and the slide rail limits the arc frame, providing a path for the rotational scanning of the arc frame, wedge block and X-ray end.

[0017] Furthermore, the X-ray end is used to scan the weld seam, and the probe is used to scan the surface stress of the high-grade steel pipe body using ultrasonic waves.

[0018] Furthermore, the ray end is bolted into the mounting hole on the surface of the wedge, and the tail end of the ray end is connected to the receiving end via an electric wire. The contact surface between the wedge and the high-strength steel pipe body is an arc surface, which can slide along the outer surface of the high-strength steel pipe body.

[0019] The beneficial effects of this invention: This invention provides a method for assessing the failure of high-strength steel pipelines, comprising: a high-strength steel pipeline body; a top frame; an arc plate; a moving plate; a first electric push rod; a connecting frame; a second electric push rod; a side plate; an insertion hole; a third electric push rod; a weld inspection assembly; a vertical frame; a wedge; a ray end; an arc frame; a slide rail; moving wheels; a mounting frame; a drive motor; a probe; a moving groove; a screw; a motor; and a moving block.

[0020] 1. When the present invention detects the surface stress of high-strength steel pipes, a third electric push rod is inserted into the insertion hole of the side plate, and the first electric push rod drives the moving plate to rise until the movement of the probe is no longer interfered with by the arc frame, and the notch of the top frame corresponding to the position of the moving plate can accommodate the arc frame to pass through.

[0021] 2. In this invention, when inspecting weld seams, the third electric push rod retracts and is not connected to the insertion hole, and the position of the third electric push rod will not interfere with the rotation of the wedge block and the ray end.

[0022] 3. Compared with the prior art, the present invention performs a circumferential inspection of the weld area using a weld inspection component, followed by a translational inspection of the pipe surface using a probe. Both inspection methods are installed at the bottom of the top frame, which improves the efficiency of parameter extraction. Furthermore, the two inspection modes do not interfere with each other's movement, making the assessment of the degree of pipe failure more convenient and faster. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating a method for assessing the failure of high-strength steel pipelines according to the present invention.

[0024] Figure 2 This is a schematic diagram of the overall structure of a high-strength steel pipeline failure assessment method according to the present invention;

[0025] Figure 3 This is a schematic diagram of the top structure of the top frame of the high-strength steel pipeline failure assessment method of the present invention;

[0026] Figure 4This is a schematic diagram of the weld inspection component structure of a high-strength steel pipeline failure assessment method according to the present invention;

[0027] Figure 5 This is a schematic diagram of the top structure of the wedge block in the failure assessment method for high-strength steel pipelines of the present invention;

[0028] Figure 6 This is a schematic diagram of the connection between the arc frame and the moving wheels in the failure assessment method for high-grade steel pipelines of the present invention.

[0029] In the diagram: 1. High-strength steel pipe body; 2. Top frame; 21. Arc plate; 22. Moving plate; 23. First electric push rod; 24. Connecting frame; 25. Second electric push rod; 26. Side plate; 27. Insertion hole; 28. Third electric push rod; 3. Weld inspection assembly; 31. Vertical frame; 32. Wedge block; 33. X-ray end; 34. Arc frame; 35. Slide rail; 36. Moving wheel; 37. Mounting frame; 38. Drive motor; 4. Probe; 41. Moving groove; 42. Screw; 43. Motor; 44. Moving block. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Please see Figures 1 to 6 This invention provides a technical solution: a failure assessment method for high-strength steel pipelines, the assessment method comprising the following steps:

[0032] S1. Comparative Data: Statistically analyze the parameters of past failed high-strength steel pipe cases and differentiate them according to the purpose and production process of the high-strength steel pipes;

[0033] S2. Pipeline weld inspection: The weld inspection component is wrapped around the weld of two sets of high-strength steel pipe bodies and scans the circular weld in a rotating manner to obtain the parameters of the weld.

[0034] S3. Pipeline surface stress detection: By contacting the pipeline surface with a probe and moving it along the pipeline surface, the collected data can be analyzed to determine the area and parameters of stress generation.

[0035] S4. Analysis and Comparison: After the collected pipeline data is entered into the system, it is compared with the parameters of the original classification. It is also compared with the parameters of high-grade steel pipelines that have failed according to the same purpose and production method. The results are obtained to determine whether the pipeline is higher or lower than the parameters of the failed high-grade steel pipelines, thereby assessing whether the pipeline has failed.

[0036] This embodiment includes a high-strength steel pipe body 1. A top frame 2 is provided on the top of the high-strength steel pipe body 1. Weld seam inspection components 3 are provided at the weld seams of two sets of high-strength steel pipe bodies 1, and the weld seam inspection components 3 are installed at the bottom of the top frame 2. A probe 4 is provided at one end of the bottom of the top frame 2, and the probe 4 slides in contact with the surface of the high-strength steel pipe body 1. Moving grooves 41 are formed on both sides of the top frame 2, and moving blocks 44 are slidably connected inside the moving grooves 41. The two ends of the probe 4 are fixed to the moving blocks 44. Arc plates 21 are fixed at both ends of the top frame 2, and the arc plates 21 press against the top of both ends of the high-strength steel pipe body 1. The weld seam inspection components 3 include wedges 32, and X-ray ends 33 are installed inside the wedges 32, with one end of the wedges 32 sliding in contact with the high-strength steel pipe body 1. The X-ray ends 33 of the weld seam inspection components 3 use X-ray scanning to scan the weld seam, and the probe 4 uses ultrasonic scanning. The surface stress of the high-strength steel pipe body 1 is scanned using the wave method. When using the device, the top frame 2 is placed on the upper end of the high-strength steel pipe body 1 through the arc plates 21 at both ends. The weld detection component 3 is set at the welds of the two sets of high-strength steel pipe bodies 1 for scanning and detection to obtain parameters. Then, the probe 4 is moved along the surface of the high-strength steel pipe body 1 to scan and obtain the surface stress parameters of the high-strength steel pipe body 1. These parameters are then compared with existing data to evaluate the high-strength steel pipe body 1. (When statistically analyzing the parameters of previous failed high-strength steel pipe cases, it is necessary to distinguish them according to the purpose and production method of the high-strength steel pipe and establish different databases. Each category requires multiple sets of data to be averaged. The average value is compared with the data collected from the pipe to be evaluated to determine whether the pipe has failed. When the average value is close to or less than the average value, it is considered to be failed. When the collected data is greater than the average value, it is considered not to be failed.)

[0037] In this embodiment, the weld inspection assembly 3 further includes a vertical frame 31. The top frame 2 has vertical frames 31 on both sides corresponding to the wedge block 32, and the surface of the vertical frame 31 has a notch for the ray end 33 and the wedge block 32 to slide through. Semi-circular arc frames 34 are fixed on both sides of the wedge block 32. Slide rails 35 are fixed on the inner wall of the vertical frame 31 at positions corresponding to the arc frames 34, and the arc frames 34 slide along the slide rails 35 on both sides. Mounting brackets 37 are fixed at both ends of the slide rails, and movable wheels 36 are rotatably mounted on the outer surface of the mounting brackets 37 via bearings. The movable wheels 36 slide against the outer wall of the high-strength steel pipe body 1. The inner side of the mounting bracket 37... A drive motor 38 is fixed, and the output end of the drive motor 38 is fixed to the moving wheel 36. A second electric push rod 25 is fixed at the top of the top frame 2 corresponding to the position of the vertical frame 31, and the extended end of the second electric push rod 25 is fixed to the top of the vertical frame 31. The second electric push rod 25 drives the vertical frame 31 to approach the high-strength steel pipe body 1 and limits the arc frame 34. Then, the drive motors 38 at both ends of the arc frame 34 drive the moving wheel 36 to rotate. The arc frame 34, wedge block 32 and X-ray end 33 rotate along the surface of the weld seam, and at least one end of the arc frame 34 is kept in contact with the slide rail 35 for limiting, so that the weld seam is scanned and detected by the X-ray end 33.

[0038] In this embodiment, a screw 42 is rotatably mounted inside the moving groove 41 via a bearing, and a moving block 44 is engaged with the screw 42. A motor 43 is fixed at the outer end of the top frame 2 corresponding to the position of the screw 42. The output end of the motor 43 is fixed to the screw 42. When the motor 43 is turned on, it drives the screw 42 to rotate. The moving block 44 engages with the screw 42 and slides along the moving groove 41. The probe 4 moves horizontally along the surface of the high-strength steel pipe body 1 and detects the stress on the surface of the high-strength steel pipe body 1. This part of the technology is the same as the technology of scanning the high-strength steel pipe body 1 with an ultrasonic probe in patent CN113218541B.

[0039] In this embodiment, the top frame 2 is provided with a movable plate 22 corresponding to the top of the inclined block, and a connecting frame 24 is fixed to the top of the movable plate 22. First electric push rods 23 are fixed to both sides of the movable plate 22 on the top frame 2, and the extended ends of the first electric push rods 23 are fixed to the connecting frame 24. Two third electric push rods 28 are symmetrically fixed to the bottom of the movable plate 22. Side plates 26 are fixed to both sides of the wedge block 32, and insertion holes 27 are opened on the top of the side plates 26. The extended ends of the third electric push rods 28 can be inserted into the insertion holes 27. When inspecting weld seams, the third electric push rod 28 retracts and is not connected to the insertion hole 27. The position of the third electric push rod 28 does not interfere with the rotation of the wedge block 32 and the ray end 33. When inspecting the surface stress of the high-grade steel pipe body 1, the third electric push rod 28 is inserted into the insertion hole 27 of the side plate 26, and the first electric push rod 23 drives the moving plate 22 to rise until the movement of the probe 4 is not interfered with by the arc frame 34. The notch of the top frame 2 corresponding to the position of the moving plate 22 can accommodate the arc frame 34 to pass through.

[0040] When using the device, the top frame 2 is placed on the upper end of the high-strength steel pipe body 1 via the arc plates 21 at both ends. The second electric push rod 25 drives the vertical frame 31 to approach the high-strength steel pipe body 1 and limits the arc frame 34. Then, the drive motors 38 at both ends of the arc frame 34 drive the moving wheels 36 to rotate. The arc frame 34, wedge block 32 and X-ray end 33 rotate along the surface of the weld seam, and at least one end of the arc frame 34 is kept in contact with the slide rail 35 for limiting, so that the weld seam is scanned and inspected by the X-ray end 33. The third electric push rod 28 is inserted into the insertion hole 27 of the side plate 26, and the first electric push rod 23 drives the moving plate 22 to rise until the movement of the probe rod 4 is no longer interfered with by the arc frame 34. The motor 43 is turned on to drive the screw 42 to rotate. The moving block 44 engages with the screw 42 and slides along the moving groove 41. The probe rod 4 moves horizontally along the surface of the high-strength pipe body 1 and detects the stress on the surface of the high-strength pipe body 1. The stress is then compared with existing data to evaluate the high-strength pipe body 1.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A failure assessment method for high-strength steel pipelines, characterized in that: A high-strength steel pipeline failure assessment device is adopted, which includes a high-strength steel pipeline body, a top frame, a weld inspection assembly, and a probe. The top of the high-strength steel pipe body is equipped with a top frame. Weld inspection components are installed at the weld joints of the two sets of high-strength steel pipe bodies, and the weld inspection components are installed at the bottom of the top frame. A probe is provided at one end of the bottom of the top frame, and the probe slides in contact with the surface of the high-strength steel pipe body. Moving grooves are opened on both sides of the top frame, and moving blocks are slidably connected inside the moving grooves. The two ends of the probe are fixed to the moving blocks. Arc plates are fixed at both ends of the top frame, and the arc plates are in extrusive contact with the top of both ends of the high-strength steel pipe body. Inside the movable slot, a screw is rotatably mounted via bearings. The movable block is meshed with the screw. A motor is fixed at the outer end of the top frame corresponding to the position of the screw, and the motor output end is fixed to the screw. The weld inspection assembly includes a vertical frame, wedges, ray end, semi-circular arc frame, slide rail, moving wheels, mounting bracket, drive motor, and second electric push rod; The top frame has vertical frames on both sides corresponding to the wedge block. The surfaces of the vertical frames have notches for the ray end and the wedge block to slide through. The ray end is installed inside the wedge block, and one end of the wedge block slides in contact with the high-strength steel pipe body. Semi-circular arc frames are fixed on both sides of the wedge block. Slide rails are fixed on the inner wall of the vertical frames at the positions corresponding to the arc frames. The arc frames slide along the slide rails on both sides. Mounting frames are fixed at both ends of the arc frames. Moving wheels are rotatably mounted on the outer surface of the mounting frames through bearings. The moving wheels slide against the outer wall of the high-strength steel pipe body. A drive motor is fixed inside the mounting frame, and the output end of the drive motor is fixed to the moving wheels. A second electric push rod is fixed at the top of the top frame at the position corresponding to the vertical frame, and the extended end of the second electric push rod is fixed to the top of the vertical frame. The top frame is equipped with a movable plate corresponding to the top of the wedge block. A connecting frame is fixed on the top of the movable plate. The top frame is fixed with first electric push rods on both sides of the movable plate, and the extended ends of the first electric push rods are fixed to the connecting frame. Two third electric push rods are symmetrically fixed at the bottom of the movable plate. Side plates are fixed on both sides of the wedge block, and the top of the side plates is provided with insertion holes. The extended ends of the third electric push rods can be inserted into the insertion holes. The evaluation method includes the following steps: S1. Comparative Data: Statistically analyze the parameters of past failed high-strength steel pipe cases and differentiate them according to the purpose and production process of the high-strength steel pipes; S2. Pipeline Weld Inspection: The weld inspection component is wrapped around the weld of two sets of high-strength steel pipe bodies. Before the inspection, the third electric push rod is retracted and not connected to the insertion hole. The position of the third electric push rod will not interfere with the rotation of the wedge and the X-ray end. The drive motors at both ends of the arc frame of the weld inspection component drive the moving wheels to rotate. The drive wheels travel along the outer surface of the high-strength steel pipe body. The arc frame, wedge and X-ray end rotate along the surface of the weld, and at least one end of the arc frame is kept in contact with the slide rail for limit. The X-ray end scans the circular weld and obtains the parameters of the weld. S3. Pipeline Surface Stress Detection: Before stress detection, the third electric push rod is inserted into the insertion hole of the side plate, and the moving plate is raised by the first electric push rod until the movement of the probe is not interfered with by the arc frame, and the notch of the top frame corresponding to the position of the moving plate can accommodate the arc frame to pass through. The motor drives the screw to rotate, and the moving block engages with the screw and slides along the moving groove. The probe moves horizontally along the surface of the high-strength steel pipe body. The probe contacts the pipe surface and detects the stress on the surface of the high-strength steel pipe body. The movement path of the probe covers the entire cross-section of the high-strength steel pipe body. The collected data is analyzed to obtain the area and parameters of stress generation. S4. Analysis and Comparison: After the collected pipeline data is entered into the system, it is compared with the parameters of the original classification. It is also compared with the parameters of high-grade steel pipelines that have failed according to the same purpose and production method. The results are obtained to determine whether the pipeline is higher or lower than the parameters of the failed high-grade steel pipelines, thereby assessing whether the pipeline has failed.

2. The failure assessment method for high-strength steel pipelines according to claim 1, characterized in that: The parameters for previous high-strength steel pipe failure cases in step S1 include: weld parameters of pipe failure, surface and internal stress parameters of pipe failure, and pipe material.

3. The failure assessment method for high-strength steel pipelines according to claim 1, characterized in that: Before the weld inspection assembly is inspected, the second electric push rod drives the vertical frame to approach the high-grade steel pipe body, and the slide rail limits the arc frame, providing a path for the rotation and scanning of the arc frame, wedge block and X-ray end.

4. The failure assessment method for high-strength steel pipelines according to claim 1, characterized in that: The X-ray end of the weld inspection component uses X-ray scanning to scan the weld, while the probe uses ultrasonic scanning to scan the surface stress of the high-grade steel pipe.

5. The failure assessment method for high-strength steel pipes according to claim 1, wherein the ray end is installed in the mounting hole on the surface of the wedge by bolts, and the tail end of the ray end is connected to the receiving end by an electric wire, and the contact surface between the wedge and the high-strength steel pipe body is an arc surface, which can slide along the outer surface of the high-strength steel pipe body.

Images