High-temperature oil and gas pipeline wall thickness detection device

Abstract

The utility model discloses a high-temperature oil and gas pipeline wall thickness detection device, which comprises an ultrasonic probe fixing device, a wave guide rod supporting device and a pipeline clamping device, a gasket I, a compression spring and an ultrasonic probe are sequentially mounted in each cylindrical structure of the probe gland from top to bottom; the main body of the wave guide rod supporting device is a semicircular cylinder, the top ends of the two wave guide rods are in contact with the two ultrasonic probes respectively, the pipeline clamping device comprises an upper pipe hoop and a lower pipe hoop which are connected, and the bottom ends of the wave guide rods penetrate through the upper pipe hoop and are in contact with a to-be-detected pipeline. The device provided by the utility model is used for solving the problems that the wave guide rod is difficult to fix and the signal coupling of the contact surface of the wave guide rod and the pipeline is poor when the wave guide rod is applied to high-temperature wall thickness detection in an industrial field, can be used for carrying out long-time on-line real-time wall thickness measurement on an oil-gas pipeline with the highest temperature of 500 DEG C, and has no high-temperature-resistant requirement on an ultrasonic probe. The device is convenient to install, low in cost and easy to popularize.

Description

Technical Field

[0001] The utility model relates to the technical field of nondestructive testing, in particular to a high-temperature oil and gas pipeline wall thickness detection device. Background Art

[0002] The operating temperature of many chemical transportation pipelines is above 350℃. After long-term operation, high-temperature pipelines will age, deform or corrode, making the wall thickness index of the pipeline no longer meet the safety requirements, leading to oil and gas pipeline accidents and even huge economic losses. Ultrasonic detection technology is used to monitor the corrosion of high-temperature chemical pipelines. The ultrasonic probe directly contacts the measured point, and the high temperature will damage the piezoelectric performance of the probe.

[0003] The ultrasonic detection technology of pipe wall thickness based on waveguide rod is adopted. Since the waveguide rod is introduced between the ultrasonic probe and the high-temperature test piece, the normal temperature probe is installed at the far end of the waveguide rod (normal temperature). The waveguide rod realizes heat insulation and transmission of ultrasonic signals. Therefore, the high temperature of the pipeline will not affect the ultrasonic probe, and it can be used for long-term thickness measurement under high temperature. The buffering waveguide rod can ensure that the working temperature of the probe is lower than the surface temperature of the test piece. The reasonable design of the waveguide rod length can make the working temperature of the transducer close to normal temperature. Therefore, the application of waveguide rod means that commercially available standard transducers can be selected as excitation and receiving probes, and there is no need to have strict requirements on the reliability of ultrasonic probes working in high temperature environments. However, the use of waveguide rods for high-temperature thickness measurement in industrial sites is difficult to fix and inconvenient to install. Some welding fixation even requires shutdown and production, and there are great safety risks. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a high-temperature oil and gas pipeline wall thickness detection device to achieve the purpose of convenient installation, low cost, good signal coupling and easy promotion.

[0005] In order to achieve the above object, the technical solution of the utility model is as follows:

[0006] A high-temperature oil and gas pipeline wall thickness detection device, comprising an ultrasonic probe fixing device, a waveguide rod supporting device and a pipeline clamping device, wherein the ultrasonic probe fixing device comprises a double-cylindrical probe gland connected as one body, the bottom and side of the cylindrical structure of the probe gland are open, and the bottom plates on both sides of the probe gland are fixed to the top of the waveguide rod supporting device by bolts, and a gasket 1, a compression spring and an ultrasonic probe are sequentially installed inside each cylindrical structure of the probe gland from top to bottom, and the wiring terminal of the ultrasonic probe is led outward through the side opening to be connected to an ultrasonic measurement host; a clamping screw is installed on the top of the probe gland, and the bottom end of the clamping screw is in contact with the gasket 1;

[0007] The main body of the waveguide rod supporting device is a semi-cylinder, with two fixed discs 1 and 2 at a certain interval provided at the upper end, and a fixed disc 3 provided at the bottom end. The top ends of the two waveguide rods located inside the semi-cylinder pass through the fixed disc 1 and the fixed disc 2, and are respectively in contact with the two ultrasonic probes. The bottom ends of the two waveguide rods pass through the fixed disc 3 and are fixedly connected to the fixed disc 3. A gasket 2 is provided between the bottom ends of the two waveguide rods.

[0008] The pipe clamping device comprises an upper pipe hoop and a lower pipe hoop connected by bolts, a fixing disc four is welded on the upper pipe hoop, and the fixing disc three and the fixing disc four are connected by bolts; the bottom end of the waveguide rod passes through the fixing disc four and the upper pipe hoop to contact the pipe to be tested.

[0009] In the above scheme, the bottom of the waveguide rod is a T-shaped structure, and fixing plates are respectively arranged on both sides of the T-shaped structure, and are fixedly connected by screws passing through the fixing plates, the T-shaped structure and the gasket 2 on both sides; the extensions at the bottom of the fixing plates on both sides are installed on the fixing discs 3 and 4 by bolts.

[0010] In the above scheme, high temperature resistant tin sheets are arranged between the waveguide rod and the ultrasonic probe, and between the waveguide rod and the pipeline to be tested.

[0011] In the above solution, the thickness of the gasket 2 is 1 mm.

[0012] In the above solution, the length of the waveguide rod is 300 mm.

[0013] In the above scheme, the interval between the fixed disc 1 and the fixed disc 2 is 20 mm, and the fixed disc 1 and the fixed disc 2 are fixedly connected to the semi-cylinder by welding.

[0014] In the above solution, the first gasket is a circular gasket, and the second gasket is a square gasket.

[0015] In the above scheme, strip holes are provided on the fixed disc 1, the fixed disc 2, the fixed disc 3, the fixed disc 4 and the upper pipe clamp for the waveguide rod to pass through.

[0016] Preferably, the ultrasonic probe is a transverse wave line focusing probe, and the waveguide rod is aligned with the focusing area of ​​the probe to ensure that the amplitude of the excitation receiving signal is the highest.

[0017] Through the above technical solution, the utility model provides the following beneficial effects:

[0018] 1. The utility model can adjust the pressure between the waveguide rod and the ultrasonic probe, and between the waveguide rod and the pipeline to be measured by adjusting the compression screw, thereby obtaining a better coupling effect, thereby increasing the strength of the signal received by the measuring host and improving the signal-to-noise ratio of the received signal.

[0019] 2. The length of the waveguide rod can ensure that the working temperature of the probe is lower than the surface temperature of the test piece, ensuring that the probe can work stably for a long time on high-temperature pipelines. It can perform long-term online real-time wall thickness measurement of oil and gas pipelines with a maximum temperature of 500°C, and there is no requirement for high temperature resistance of the ultrasonic probe.

[0020] 3. The utility model adopts a split structure, which is easy to design and install, avoiding welding operations on high-temperature pipelines in service, and ensuring the smoothness of the industrial production process.

[0021] 4. The utility model adds a gasket 2 between the two waveguide rods to avoid mutual influence of ultrasonic signals between the two waveguide rods. The one-transmit-two-receive thickness measurement algorithm can be used to calculate the thickness measurement value, which has a smaller measurement error.

[0022] 5. The utility model leads the connection post of the ultrasonic probe outward through the side opening to connect to the ultrasonic measurement host. The advantage is that when the ultrasonic probe fails and needs to be replaced, it is only necessary to disassemble the ultrasonic probe fixing device and replace the ultrasonic probe, and then reuse it, avoiding the need to replace the entire device.

[0023] 6. The utility model can adapt to high-temperature pipes with different outer diameters by replacing pipe clamping devices with different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0025] Figure 1 A schematic diagram of a high-temperature oil and gas pipeline wall thickness detection device disclosed in an embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of the structure of the ultrasonic probe fixing device;

[0027] Figure 3 It is a partial cross-sectional view of the ultrasonic probe fixing device;

[0028] Figure 4 It is a schematic diagram of the structure of the waveguide rod support device;

[0029] Figure 5 This is a schematic diagram of the semi-cylindrical structure of the waveguide rod support device;

[0030] Figure 6 It is a schematic diagram of the fixed plate structure;

[0031] Figure 7 This is the disassembly diagram of the fixed plate structure;

[0032] Figure 8 It is a schematic diagram of the structure of the pipe clamping device;

[0033] Fig. 9 This is a disassembled diagram of the pipe clamping device.

[0034] In the figure, 1. tightening screw; 2. probe gland; 3. bolt; 4. bottom plate; 5. compression spring; 6. probe terminal; 7. ultrasonic probe; 8. fixed disc 1; 9. fixed disc 2; 10. waveguide rod; 11. semi-cylinder; 12. 2mm screw; 13. left fixing plate; 14. fixed disc 3; 15. upper pipe clamp; 16. 3mm screw; 17. lower pipe clamp; 18. fixed disc 4; 19. right fixing plate; 20. pipeline to be tested; 21. gasket 1; 22. strip hole; 23. screw hole; 24. gasket 2. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] The utility model provides a high-temperature oil and gas pipeline wall thickness detection device, such as Figure 1 As shown, it includes an ultrasonic probe fixing device, a waveguide rod supporting device and a pipe clamping device.

[0037] like Figure 2 and Figure 3 As shown, the ultrasonic probe fixing device includes a double-cylindrical probe gland 2 connected as one body, the bottom and side of the cylindrical structure of the probe gland 2 are open, and the bottom plates 4 on both sides of the probe gland 2 are fixed to the top of the waveguide rod support device by bolts 3. The inside of each cylindrical structure of the probe gland 2 is sequentially installed with a circular gasket 21, a compression spring 5 and an ultrasonic probe 7 from top to bottom, and the connection terminal of the ultrasonic probe 7 is led outward through the side opening to connect the ultrasonic measurement host; a clamping screw 1 is installed on the top of the probe gland 2, and the bottom end of the clamping screw 1 contacts the gasket 21. The upper end of the compression spring 5 contacts the gasket 21, and the lower end contacts the ultrasonic probe 7, and the diameter of the gasket 21 and the outer diameter of the compression spring 5 are the same as the inner diameter of the cylindrical structure. By adjusting the top clamping screw 1, the clamping screw 1 applies pressure to the gasket 21 and the compression spring 5 in the probe gland 2, thereby enhancing the coupling effect between the ultrasonic probe 7 and the waveguide rod 10.

[0038] like Figure 4 and Figure 5As shown, the main body of the waveguide rod supporting device is a semi-cylinder 11, with two fixed discs 1 8 and 9 with a spacing of 20 mm welded on the upper end, and a fixed disc 3 14 welded on the bottom end. The top ends of the two waveguide rods 10 located inside the semi-cylinder 11 pass through the fixed disc 1 8 and the fixed disc 2 9, and are respectively in contact with the two ultrasonic probes 7. The bottom ends of the two waveguide rods 10 pass through the fixed disc 3 14 and are fixedly connected to the fixed disc 3 14. A square gasket 24 with a thickness of 1 mm is arranged between the bottom ends of the two waveguide rods 10.

[0039] Specifically, the bottom of the waveguide rod 10 is a T-shaped structure, and fixing plates are respectively arranged on both sides of the T-shaped structure. Figure 6 and Figure 7 As shown, screw holes 23 are provided on the side and bottom of the fixing plate, and 2mm screws 12 are passed through the left fixing plate 13, the right fixing plate 19, the T-shaped structure and the second gasket 24 for fixing and connecting; the extensions at the bottom of the fixing plates on both sides are installed on the fixing disc 3 14 and the fixing disc 4 18 by screws. By adjusting the bolts, the waveguide probe 10 is pressed tightly against the high-temperature pipeline to increase the coupling effect between the waveguide probe 10 and the high-temperature pipeline.

[0040] like Figure 8 and Fig. 9 As shown, the pipe clamping device includes an upper pipe hoop 15 and a lower pipe hoop 17 connected by 3mm screws 16, a fixing disc 4 18 is welded on the upper pipe hoop 15, and the fixing disc 3 14 and the fixing disc 4 18 are connected by screws; the bottom end of the waveguide probe 10 passes through the fixing disc 4 18 and the upper pipe hoop 15 to contact the pipe 20 to be tested. By replacing pipe hoops of different diameters, it can adapt to pipes 20 to be tested with different outer diameters.

[0041] Specifically, the fixed disc 1 8 , the fixed disc 2 9 , the fixed disc 3 14 , the fixed disc 4 18 and the upper pipe hoop 15 are all provided with strip holes 22 for the waveguide rod 10 to pass through.

[0042] In this embodiment, high temperature resistant tin sheets are provided between the waveguide rod 10 and the ultrasonic probe 7 and between the waveguide rod 10 and the pipeline to be measured 20 for coupling.

[0043] In this embodiment, the waveguide rod 10 is 300 mm long, which can meet the requirements of long-term monitoring of pipelines at a temperature of 500° C.

[0044] Before measurement, it is necessary to determine the size of the waveguide rod 10, such as length, width, and thickness, to ensure that the non-dispersive thickness measurement waveform can be excited. Then, the waveguide rod 10 is fixed to the fixing plate by screws, and then the ultrasonic probe 7 and the compression spring 5 are installed. The double-cylindrical probe gland 2 is fixed on the fixed disc 1 8 of the waveguide rod 10 support device, and then the pipe clamping device is fixed on the pipe 20 to be measured, and the fixed disc 3 14 and the fixed disc 4 18 are connected. The pipe temperature is uploaded to the ultrasonic measurement host through the temperature sensor for sound velocity correction. The ultrasonic measurement host excites and receives the ultrasonic signal every 1 minute, calculates the thickness measurement value using the time difference, and displays the measurement value reading, which is the wall thickness measurement value of the pipe 20 to be measured. The specific settings are based on the actual construction requirements, and no specific restrictions are made in this application.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-temperature oil and gas pipeline wall thickness detection device, characterized in that: It comprises an ultrasonic probe fixing device, a waveguide rod supporting device and a pipe clamping device, wherein the ultrasonic probe fixing device comprises a double-cylindrical probe gland connected as one body, the bottom and side of the cylindrical structure of the probe gland are open, the bottom plates on both sides of the probe gland are fixed to the top of the waveguide rod supporting device by bolts, the inside of each cylindrical structure of the probe gland is sequentially installed with a gasket 1, a compression spring and an ultrasonic probe from top to bottom, the connection terminal of the ultrasonic probe is led outward through the side opening and connected to the ultrasonic measurement host; a clamping screw is installed on the top of the probe gland, and the bottom end of the clamping screw is in contact with the gasket 1; The main body of the waveguide rod supporting device is a semi-cylinder, with two fixed discs 1 and 2 at a certain interval provided at the upper end, and a fixed disc 3 provided at the bottom end. The top ends of the two waveguide rods located inside the semi-cylinder pass through the fixed disc 1 and the fixed disc 2, and are respectively in contact with the two ultrasonic probes. The bottom ends of the two waveguide rods pass through the fixed disc 3 and are fixedly connected to the fixed disc 3. A gasket 2 is provided between the bottom ends of the two waveguide rods. The pipe clamping device comprises an upper pipe hoop and a lower pipe hoop connected by bolts, a fixing disc four is welded on the upper pipe hoop, and the fixing disc three and the fixing disc four are connected by bolts; the bottom end of the waveguide rod passes through the fixing disc four and the upper pipe hoop to contact the pipe to be tested.

2. A high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: The bottom of the waveguide rod is a T-shaped structure, and fixing plates are respectively arranged on both sides of the T-shaped structure, and screws are passed through the fixing plates, the T-shaped structure and the gasket 2 on both sides for fixed connection; the extensions at the bottom of the fixing plates on both sides are installed on the fixing discs 3 and 4 by bolts.

3. A high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: High temperature resistant tin sheets are arranged between the waveguide rod and the ultrasonic probe, and between the waveguide rod and the pipeline to be tested.

4. A high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: The thickness of the gasket 2 is 1 mm.

5. The high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: The length of the waveguide rod is 300 mm.

6. A high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: The fixed disc 1 and the fixed disc 2 are spaced 20 mm apart, and the fixed disc 1 and the fixed disc 2 are fixedly connected to the semi-cylinder by welding.

7. A high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: The first gasket is a circular gasket, and the second gasket is a square gasket.

8. The high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: The fixed disc 1, the fixed disc 2, the fixed disc 3, the fixed disc 4 and the upper pipe hoop are all provided with strip holes for the waveguide rod to pass through.

9. The high-temperature oil and gas pipeline wall thickness detection device according to claim 1, characterized in that: The ultrasonic probe is a transverse wave line focusing probe, and the waveguide rod is aligned with the focusing area of ​​the probe.

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