Corrosion deformation detection device and method for pressure pipeline

Abstract

The invention discloses a device and a method for detecting corrosion deformation of a pressure pipeline, relates to the field of pressure pipeline detection, and can improve the digitization and automation level of measurement, enable the detection result to be more comprehensive and improve the detection quality. In the pressure pipeline corrosion deformation detection device, a control terminal can be used for setting the running speed of an outside-pipe measurement module and an inside-pipe measurement module outside or inside a pipeline along the axis of the pipeline, the rotating speed of a laser ranging sensor along the circumferential direction of the pipeline, and the sampling spacing of laser ranging positions along the axis direction of the pipeline; the in-pipe measurement module is controlled to automatically recall to the measurement starting position after the pipeline runs for a long distance or the remaining electric quantity; the control terminal can be used for receiving measurement data, including displacement data, angle data and laser ranging data, returned by the out-tube measurement module or the in-tube measurement module after the measurement task is executed; the outside-pipe measurement module and the inside-pipe measurement module respectively comprise a processor, and a data communication unit, a motion control assembly and a data acquisition assembly which are connected with the processor.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure pipeline detection, and in particular to a pressure pipeline corrosion deformation detection device and method. Background Art

[0002] Pressure pipelines are important equipment for industrial production and are widely used in the petrochemical industry, metallurgical industry, etc. The media transmitted in pressure pipelines are usually high-pressure, flammable, explosive, toxic, high-temperature or low-temperature. Therefore, accidents such as leakage and explosion of pressure pipelines often cause serious consequences such as mass casualties, huge economic losses and environmental pollution.

[0003] At present, as a type of special equipment related to public safety, the safety of pressure pipelines is highly valued by users, inspection units and regulatory units. In my country, under the premise that users assume the main responsibility for the safety of pressure pipelines, pressure pipelines implement a regular inspection and supervision inspection system, and the inspection process is carried out by special equipment inspection agencies authorized by the State Administration for Market Regulation.

[0004] Among them, corrosion and deformation detection are important contents in the process of pressure pipeline safety inspection. Corrosion is mainly caused by the inner wall material of the pressure pipeline being corroded by the conveying medium, resulting in the thinning of the pipe wall. Deformation is usually caused by the impact of foreign objects on the pipe wall during use, forming a local depression towards the inner wall of the pipe.

[0005] In the prior art, regular inspection of pressure pipelines generally requires shutting down and draining the medium in the pipeline. Traditional corrosion inspection methods generally use a thickness gauge to measure the wall thickness on the outside of the pipeline, and conduct spot checks on the corrosion and thinning of the pipe wall. The measurement method is point measurement, which has the problems of limited coverage of the measurement area and low measurement efficiency. Traditional pipeline deformation detection generally uses a macroscopic detection method of human visual observation, which is not convenient for quantitative evaluation of the degree of deformation. Summary of the invention

[0006] The purpose of the present invention is to provide a pressure pipeline corrosion deformation detection device and method, which can effectively improve the digitalization level and automation level of measurement, so as to make the detection result more comprehensive, thereby improving the detection quality and ensuring the safe and stable operation of the pressure pipeline.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme: A pressure pipeline corrosion deformation detection device comprises: a control terminal, and an outer-pipe measurement module and an inner-pipe measurement module respectively connected to the control terminal through wireless communication; the control terminal can be used to set the running speed of the outer-pipe measurement module and the inner-pipe measurement module outside or inside the pipeline along the pipeline axis, the rotation speed of the laser ranging sensor along the pipeline circumference, the sampling interval of the laser ranging position along the pipeline axis, and control the inner-pipe measurement module to automatically recall to the measurement starting position after the pipeline runs a certain distance or the remaining power; the control terminal can be used to receive the measurement data transmitted back by the outer-pipe measurement module or the inner-pipe measurement module after completing the measurement task, including displacement data, angle data, and laser ranging data; The out-of-tube measurement module and the in-tube measurement module respectively include: a processor, and a data communication unit, a motion control component and a data acquisition component respectively connected to the processor; the motion control component includes: a linear motion control unit and a rotational motion control unit; the data acquisition component includes: a displacement data acquisition unit, an angle data acquisition unit and a laser ranging data acquisition unit.

[0008] In practical application, the displacement data is a displacement-time series along the axial distance of the pipeline from the starting point of the movement; The angle data is the angle of rotation of the laser ranging sensor when it points to different parts of the pipeline for displacement measurement, and the angle range is 0~360°; The laser ranging data is the distance between the laser ranging probe and the outer surface or inner surface of the pipeline obtained by the laser ranging sensor, and the distance is the distance in different directions of 360°.

[0009] The linear motion control unit controls the movement of the measuring module along the pipeline axis by electromechanical control. When laser ranging data collection is required, the movement is stopped. Then, the laser ranging sensor of the laser ranging data collection unit is controlled by the rotational motion control unit to rotate, so as to realize the dimensional measurement of different positions of the same cross section of the outer surface or inner surface of the pipeline.

[0010] Specifically, the laser ranging sensor points to the center of the pipeline and rotates continuously by 360°, and the distance between the measuring sensor and the outer surface of the pipeline is L1, and at the same time, the angle data acquisition unit acquires the rotation angle of the laser ranging sensor as θ, and obtains a "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the outer radius R1 of the pipeline is: R1=D1 / 2-L1.

[0011] Furthermore, the laser ranging sensor points to the center of the pipeline and rotates continuously by 360°, and the distance between the measuring sensor and the inner surface of the pipeline is L2, and at the same time, the angle data acquisition unit acquires the rotation angle of the laser ranging sensor as θ, and obtains a "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the inner radius R2 of the pipeline is: R2=D2 / 2+L2.

[0012] Furthermore, the position at the end of the laser ranging sensor corresponds to a distance measured by the laser ranging sensor of 0.

[0013] Furthermore, the wall thickness t of the pipe is: t=R1-R2; There is no obvious change in R1 at different angles. R2 increases between θ1 and θ2, which means that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1. The part with the smallest t has the smallest remaining wall thickness and is the most severely corroded part. In other words, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged.

[0014] Furthermore, the pipe deformation will not change the wall thickness of the pipe, that is, t=R1-R2, but will affect the values ​​of R1 and R2 at the same position, that is, R1 and R2 will both become smaller within the same angle θ.

[0015] A pressure pipeline corrosion deformation detection method, a laser ranging sensor points to the center of the pipeline and rotates 360 degrees continuously, and the distance between the sensor and the outer surface of the pipeline is L1, and the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the outer radius R1 of the pipeline is: R1=D1 / 2-L1; The laser distance sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the sensor and the inner surface of the pipeline is L2. At the same time, the angle data acquisition unit collects the rotation angle of the laser distance sensor as θ, and obtains the "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser distance sensor, and the inner radius R2 of the pipeline is: R2=D2 / 2+L2; The wall thickness t of the pipeline is: t=R1-R2; R1 at different angles does not change significantly, and R2 increases between θ1 and θ2, which means that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1; the remaining wall thickness of the pipeline is the smallest at the location with the smallest t, which is the location with the most serious corrosion, that is, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged; pipeline deformation will not change the wall thickness of the pipeline, that is, t=R1-R2, but will affect the values ​​of R1 and R2 at the same location, that is, R1 and R2 will both decrease within the same angle θ range.

[0016] Compared with the prior art, the pressure pipeline corrosion deformation detection device and method described in the present invention have the following advantages: In the pressure pipeline corrosion deformation detection device and method provided by the present invention, since the operation control terminal can be used to set the running speed of the outer pipe measurement module and the inner pipe measurement module outside or inside the pipeline along the pipeline axis, the rotation speed of the laser ranging sensor along the pipeline circumference, the sampling interval of the laser ranging position along the pipeline axis, and control the inner pipe measurement module to automatically recall to the measurement starting position after the pipeline runs a certain distance or the remaining power; the control terminal can be used to receive the measurement data returned by the outer pipe measurement module or the inner pipe measurement module after the measurement task is completed, including displacement data, angle data, and laser ranging data; the outer pipe measurement module and the inner pipe measurement module respectively include: a processor, and a data communication unit, a motion control component and a data acquisition component respectively connected to the processor; the motion control component includes: a linear motion control unit and a rotational motion control unit; the data acquisition The assembly includes: a displacement data acquisition unit, an angle data acquisition unit and a laser ranging data acquisition unit; at the same time, the laser ranging sensor points to the center of the pipeline and rotates continuously by 360°, and the distance between the measuring sensor and the outer surface of the pipeline is L1, and the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, then the outer radius R1 of the pipeline is: R1=D1 / 2-L1; and, the laser ranging sensor points to the center of the pipeline and rotates continuously by 360°, and the distance between the measuring sensor and the inner surface of the pipeline is L2, and the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, then the inner radius R2 of the pipeline is: R2=D2 / 2+L2; the wall thickness t of the pipeline is: t=R1-R2; R1 at different angles does not change significantly, and R2 increases between θ1 and θ2, then it is judged that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1; the remaining wall thickness of the pipeline is the smallest at the location with the smallest t, which is the location with the most serious corrosion, that is, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged; pipeline deformation will not change the wall thickness of the pipeline, that is, t=R1-R2, but will affect the values ​​of R1 and R2 at the same location, that is, R1 and R2 both decrease within the same angle θ range; therefore, the pressure pipeline corrosion deformation detection device and method provided by the present invention can effectively improve the digitalization level and automation level of the measurement, thereby making the detection result more comprehensive, thereby improving the detection quality and ensuring the safe and stable operation of the pressure pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the framework structure of a pressure pipeline corrosion deformation detection device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the cross-sectional structure measured by the external pipe measurement module in the pressure pipe corrosion deformation detection device provided by an embodiment of the present invention; Figure 3 A schematic diagram of the longitudinal section structure measured by the outer pipe measurement module in the pressure pipe corrosion deformation detection device provided by an embodiment of the present invention; Figure 4 A schematic diagram of the cross-sectional structure measured by the in-pipe measurement module in the pressure pipeline corrosion deformation detection device provided by an embodiment of the present invention; Figure 5 A schematic diagram of the longitudinal section structure measured by the in-pipe measurement module in the pressure pipeline corrosion deformation detection device provided by an embodiment of the present invention; Figure 6 A schematic diagram of the principle of detecting the inner wall corrosion of a pressure pipeline in a corrosion and deformation detection device for a pressure pipeline provided by an embodiment of the present invention; Figure 7 A schematic diagram of the pipeline deformation detection principle in a pressure pipeline corrosion deformation detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] For ease of understanding, the pressure pipeline corrosion deformation detection device and method provided by the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] The embodiment of the present invention provides a pressure pipeline corrosion deformation detection device, such as Figure 1-Figure 7 As shown, it includes: a control terminal (the control terminal can be a handheld intelligent terminal, such as an industrial tablet computer with wireless communication, a laptop computer, or other modules that can perform calculation and control functions), and an outside-pipe measurement module and an inside-pipe measurement module connected to the control terminal through wireless communication respectively; the operation control terminal can be used to set the running speed of the outside-pipe measurement module and the inside-pipe measurement module along the pipeline axis outside or inside the pipeline, the rotation speed of the laser ranging sensor along the pipeline circumference, the sampling interval of the laser ranging position along the pipeline axis, and control the inside-pipe measurement module to automatically recall to the measurement starting position after the pipeline runs a certain distance or the remaining power; the control terminal can be used to receive the measurement data transmitted back by the outside-pipe measurement module or the inside-pipe measurement module after completing the measurement task, including displacement data, angle data, and laser ranging data; The outer tube measurement module and the inner tube measurement module respectively include: a processor, and a data communication unit, a motion control component and a data acquisition component respectively connected to the processor; the motion control component includes: a linear motion control unit and a rotational motion control unit; the data acquisition component includes: a displacement data acquisition unit, an angle data acquisition unit and a laser ranging data acquisition unit.

[0020] The embodiment of the present invention further provides a method for detecting corrosion deformation of a pressure pipeline. Figure 1-Figure 7 As shown, the laser ranging sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the measuring sensor and the outer surface of the pipeline is L1. At the same time, the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the outer radius R1 of the pipeline is: R1=D1 / 2-L1; The laser distance sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the sensor and the inner surface of the pipeline is L2. At the same time, the angle data acquisition unit collects the rotation angle of the laser distance sensor as θ, and obtains the "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser distance sensor, and the inner radius R2 of the pipeline is: R2=D2 / 2+L2; The wall thickness t of the pipeline is: t=R1-R2; R1 at different angles does not change significantly, and R2 increases between θ1 and θ2, which means that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1; the remaining wall thickness of the pipeline is the smallest at the location with the smallest t, which is the location with the most serious corrosion, that is, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged; pipeline deformation will not change the wall thickness of the pipeline, that is, t=R1-R2, but will affect the values ​​of R1 and R2 at the same location, that is, R1 and R2 will both decrease within the same angle θ range.

[0021] Compared with the prior art, the pressure pipeline corrosion deformation detection device and method described in the embodiments of the present invention have the following advantages: In the pressure pipeline corrosion deformation detection device and method provided by the embodiment of the present invention, since the operation control terminal can be used to set the running speed of the outer pipe measurement module and the inner pipe measurement module outside or inside the pipeline along the pipeline axis, the rotation speed of the laser ranging sensor along the pipeline circumference, the sampling interval of the laser ranging position along the pipeline axis, and control the inner pipe measurement module to automatically recall to the measurement starting position after a certain distance of pipeline operation or a certain amount of power remaining; the control terminal can be used to receive the measurement data returned by the outer pipe measurement module or the inner pipe measurement module after completing the measurement task, including displacement data, angle data, and laser ranging data; the outer pipe measurement module and the inner pipe measurement module respectively include: a processor, and a data communication unit, a motion control component and a data acquisition component respectively connected to the processor; the motion control component includes: a linear motion control unit and a rotational motion control unit; the data The acquisition component includes: a displacement data acquisition unit, an angle data acquisition unit and a laser ranging data acquisition unit; at the same time, the laser ranging sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the measuring sensor and the outer surface of the pipeline is L1. At the same time, the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, then the outer radius R1 of the pipeline is: R1=D1 / 2-L1; and, the laser ranging sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the measuring sensor and the inner surface of the pipeline is L2, and the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, then the inner radius R2 of the pipeline is: R2=D2 / 2+L2; the wall thickness t of the pipeline is: t=R1-R2; R1 at different angles does not change significantly, and R2 increases between θ1 and θ2, then it is judged that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1; the remaining wall thickness of the pipeline is the smallest at the location with the smallest t, which is the location with the most serious corrosion, that is, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged; pipeline deformation will not change the wall thickness of the pipeline, that is, t=R1-R2, but will affect the values ​​of R1 and R2 at the same location, that is, R1 and R2 both decrease within the same angle θ range; therefore, the pressure pipeline corrosion deformation detection device and method provided in the embodiment of the present invention can effectively improve the digitalization level and automation level of the measurement, so as to make the detection result more comprehensive, thereby improving the detection quality and ensuring the safe and stable operation of the pressure pipeline.

[0022] In practical application, such as Figure 1-Figure 7 As shown, the above displacement data is a displacement-time series along the axial distance of the pipeline from the starting point of the movement; The angle data is the rotation angle of the laser ranging sensor when it points to different parts of the pipeline for displacement measurement, and the angle range is 0~360°; The laser ranging data is the distance between the laser ranging probe and the outer or inner surface of the pipe obtained by the laser ranging sensor, and the distance is the distance in different directions of 360°.

[0023] Among them, Figure 1-Figure 7 As shown, the linear motion control unit controls the movement of the measuring module along the pipeline axis by electromechanical control. When laser ranging data acquisition is required, the movement is stopped. Then, the laser ranging sensor of the laser ranging data acquisition unit is controlled by the rotary motion control unit to rotate, so as to realize the dimensional measurement of different positions of the same cross section of the outer surface or inner surface of the pipeline.

[0024] Specifically, Figure 1-Figure 7 , especially Figure 2 and Figure 3 As shown, the laser ranging sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the sensor and the outer surface of the pipeline is measured as L1. At the same time, the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the outer radius R1 of the pipe is: R1=D1 / 2-L1.

[0025] Furthermore, if Figure 1-Figure 7 , especially Figure 4 and Figure 5 As shown, the laser ranging sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the sensor and the inner surface of the pipeline is measured as L2. At the same time, the angle data acquisition unit collects the rotation angle of the laser ranging sensor as θ, and obtains the "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the inner radius R2 of the pipe is: R2=D2 / 2+L2.

[0026] Furthermore, if Figure 1-Figure 7 As shown, the position at the end of the laser ranging sensor corresponds to the distance measured by the laser ranging sensor being 0.

[0027] Furthermore, if Figure 1-Figure 7 , especially Figure 6 As shown, the wall thickness t of the pipe is: t=R1-R2; There is no obvious change in R1 at different angles. R2 increases between θ1 and θ2, which means that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1. The part with the smallest t has the smallest remaining wall thickness and is the most severely corroded part. In other words, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged.

[0028] It should be noted that the above analysis data is the data of the same pipe cross-section position, that is, the running distance S of the external pipe measurement module ( Figure 3 ) and the running distance S of the measuring module in the pipe ( Figure 5 ) when the data is consistent.

[0029] Furthermore, if Figure 1-Figure 7 , especially Figure 7 As shown, pipe deformation will not change the wall thickness of the pipe, that is, t=R1-R2, but will affect the values ​​of R1 and R2 at the same position, that is, R1 and R2 will both become smaller within the same angle θ range.

[0030] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pressure pipeline corrosion deformation detection device, characterized in that: The invention comprises: a control terminal, and an outer-pipe measurement module and an inner-pipe measurement module respectively connected to the control terminal by wireless communication; the control terminal can be operated to set the running speed of the outer-pipe measurement module and the inner-pipe measurement module along the pipeline axis outside or inside the pipeline, the rotation speed of the laser ranging sensor along the pipeline circumference, the sampling interval of the laser ranging position along the pipeline axis, and control the inner-pipe measurement module to automatically recall to the measurement starting position after running a certain distance in the pipeline or the remaining amount of power; the control terminal can be used to receive the measurement data transmitted back by the outer-pipe measurement module or the inner-pipe measurement module after completing the measurement task, including displacement data, angle data, and laser ranging data; The out-of-tube measurement module and the in-tube measurement module respectively include: a processor, and a data communication unit, a motion control component and a data acquisition component respectively connected to the processor; the motion control component includes: a linear motion control unit and a rotational motion control unit; the data acquisition component includes: a displacement data acquisition unit, an angle data acquisition unit and a laser ranging data acquisition unit.

2. The pressure pipeline corrosion deformation detection device according to claim 1 is characterized in that: The displacement data is a displacement-time series along the axial direction of the pipeline from the starting point of the movement; The angle data is the angle of rotation of the laser ranging sensor when it points to different parts of the pipeline for displacement measurement, and the angle range is 0~360°; The laser ranging data is the distance between the laser ranging probe and the outer surface or inner surface of the pipeline obtained by the laser ranging sensor, and the distance is the distance in different directions of 360°.

3. The pressure pipeline corrosion deformation detection device according to claim 2 is characterized in that: The linear motion control unit controls the measurement module to move along the pipeline axis by electromechanical control. When laser ranging data collection is required, the movement is stopped. Then, the laser ranging sensor of the laser ranging data collection unit is controlled by the rotational motion control unit to rotate, so as to realize the dimensional measurement of different positions of the same cross section of the outer surface or inner surface of the pipeline.

4. The pressure pipeline corrosion deformation detection device according to claim 3 is characterized in that: The laser distance measuring sensor points to the center of the pipeline and rotates continuously by 360°, and the distance between the sensor and the outer surface of the pipeline is measured as L1. At the same time, the angle data acquisition unit acquires the rotation angle of the laser distance measuring sensor as θ, and obtains a "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the outer radius R1 of the pipeline is: R1=D1 / 2-L1.

5. The pressure pipeline corrosion deformation detection device according to claim 4 is characterized in that: The laser distance measuring sensor points to the center of the pipeline and rotates continuously by 360°, and the distance between the measuring sensor and the inner surface of the pipeline is L2. At the same time, the angle data acquisition unit acquires the rotation angle of the laser distance measuring sensor as θ, and obtains a "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser ranging sensor, and the inner radius R2 of the pipeline is: R2=D2 / 2+L2.

6. The pressure pipeline corrosion deformation detection device according to claim 4 or 5, characterized in that: The position at the end of the laser ranging sensor corresponds to a distance measured by the laser ranging sensor of 0.

7. The pressure pipeline corrosion deformation detection device according to claim 5 is characterized in that: The wall thickness t of the pipe is: t=R1-R2; There is no obvious change in R1 at different angles. R2 increases between θ1 and θ2, which means that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1. The part with the smallest t has the smallest remaining wall thickness and is the most severely corroded part. In other words, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged.

8. The pressure pipeline corrosion deformation detection method according to claim 5 is characterized in that: Pipe deformation will not change the wall thickness of the pipe, that is, t=R1-R2, but it will affect the values ​​of R1 and R2 at the same position, that is, R1 and R2 will both become smaller within the same angle θ range.

9. A pressure pipeline corrosion deformation detection method, characterized in that: The laser distance sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the sensor and the outer surface of the pipeline is L1. At the same time, the angle data acquisition unit collects the rotation angle of the laser distance sensor as θ, and obtains the "L1-θ" data sequence; D1 is the circumference of the rotating circular trajectory of the end of the laser distance sensor, and the outer radius R1 of the pipeline is: R1=D1 / 2-L1; The laser distance sensor points to the center of the pipeline and rotates 360° continuously, and the distance between the sensor and the inner surface of the pipeline is L2. At the same time, the angle data acquisition unit collects the rotation angle of the laser distance sensor as θ, and obtains the "L2-θ" data sequence; D2 is the circumference of the rotating circular trajectory of the end of the laser distance sensor, and the inner radius R2 of the pipeline is: R2=D2 / 2+L2; The wall thickness t of the pipeline is: t=R1-R2; R1 at different angles does not change significantly, and R2 increases between θ1 and θ2, which means that the pipeline has inner wall corrosion in this section, and the corrosion position is between θ1 and θ1; the remaining wall thickness of the pipeline is the smallest at the location with the smallest t, which is the location with the most serious corrosion, that is, corrosion inside the pipeline will cause R2 to increase while R1 remains unchanged; pipeline deformation will not change the wall thickness of the pipeline, that is, t=R1-R2, but will affect the values ​​of R1 and R2 at the same location, that is, R1 and R2 will both decrease within the same angle θ range.

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