Small-caliber pipe circumferential ray detection device and detection method

Abstract

The invention relates to the technical field of nondestructive detection of small-caliber pipes, in particular to a circumferential ray detection device and detection method for small-caliber pipes, solves the problems of high working efficiency, high labor intensity and influence on human health caused by one-by-one flaw detection of small-caliber pipes in the prior art, and can complete flaw detection of a plurality of small-caliber pipes at one time. The flaw detection device comprises a base, the top surface of the base is provided with two supporting plates which are symmetrical front and back and are vertically distributed, the peripheries of the supporting plates are circular, and the upper part areas of the peripheries of the two supporting plates are provided with a plurality of pipe grooves in the circumferential direction; the front and back corresponding pipe grooves of the two supporting plates are used for placing the same small-caliber pipe; and a flaw detector capable of annularly emitting X-rays is arranged between the two supporting plates.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology for small-diameter pipes, and particularly to a circumferential X-ray testing device and method for small-diameter pipes. Background Technology

[0002] In critical fields such as pressure pipelines and pressure vessels, small-diameter seamless pipes and butt welds between pipes and flanges are widely used. To ensure safe and stable production, 100% radiographic inspection of the weld circumference is required to avoid internal defects exceeding standards. However, for small-diameter pipes with a diameter of DN100 or less, since it is impossible to place a flaw detector inside the pipe, only double-wall double-image radiographic inspection can be used. When performing radiographic inspection on the weld circumference of each small-diameter pipe, the pipe needs to be rotated to ensure that the entire weld circumference is irradiated by X-rays. Generally, rotating a small-diameter pipe at least 2-3 times is sufficient to obtain multiple films for monitoring.

[0003] However, the number of small-diameter pipes is often at least ten, and a batch of small-diameter pipes usually consists of around 20. These need to be inspected sequentially until the entire inspection process is completed, resulting in very low efficiency and high labor intensity. Furthermore, frequent entry and exit of personnel into the inspection room increases their exposure time to radiation sources, which also has a certain impact on the health of the operators. Summary of the Invention

[0004] This invention provides a circumferential X-ray inspection device and method for small-diameter pipes, which solves the problems of high work efficiency, labor intensity and human health impact caused by the prior art of inspecting small-diameter pipes one by one. It can complete the inspection of multiple small-diameter pipes at one time, improve the inspection efficiency and reduce the contact time between people and radiation sources.

[0005] This invention is achieved through the following technical solution: A small-diameter pipe circumferential X-ray inspection device includes a base. The top surface of the base is provided with two support plates that are symmetrically arranged front and back and vertically distributed. The outer periphery of the support plates is circular. The upper part of the outer periphery of the two support plates is provided with multiple pipe grooves along the circumferential direction. The corresponding pipe grooves of the two support plates are used to place the same small-diameter pipe. A flaw detector capable of emitting X-rays in a ring is installed between the two support plates.

[0006] Furthermore, multiple tube grooves are evenly distributed along the circumference in the upper 200° angular region of the outer periphery of both support plates.

[0007] Furthermore, the outer side of the support plate is equipped with steel wire ropes on the right side and rope-tying holes on the left side. When a small-diameter pipe is placed in a pipe groove, the wire rope is wrapped around the outside of the small-diameter pipe and fixed to the rope-tying hole, thereby securing the small-diameter pipe.

[0008] Furthermore, the support plate is a support ring plate, and the inner sides of the two support plates are fixed together by 3-4 tie rods near the pipe groove; The base includes an arc-shaped steel plate, and the bottom of the arc-shaped steel plate is welded with horizontally distributed pull plates through a vertical connecting plate; The bottom outer periphery of the two support plates is fixedly connected to the arc-shaped surface of the base by bolt assembly.

[0009] Furthermore, a bracket is provided in the middle area of ​​the base, the flaw detector is mounted on the bracket, and the X-ray source of the flaw detector is located on the axis of the support plate.

[0010] Furthermore, the number of the tubing is 20-25.

[0011] Furthermore, the flaw detector is an industrial X-ray flaw detector.

[0012] A method for circumferential radiographic testing of small-diameter pipes, comprising the following steps, using the aforementioned circumferential radiographic testing device to perform radiographic testing on the welded circumferential seam of a small-diameter pipe: S01. Place the front and rear ends of the small-diameter pipe in the corresponding pipe grooves of the two support plates, and place each small-diameter pipe in sequence so that the weld circumferential seam of each small-diameter pipe is within the irradiation range of the flaw detector. S02. A film is pasted on the side of each small-diameter welded circumferential seam area away from the flaw detector; S03. Turn on the flaw detector. The flaw detector emits X-rays in a ring. The X-rays irradiate the welded circumferential seam area of ​​each small-diameter pipe and form an image on the film. S04. Turn off the flaw detector and remove the film that has formed the image; S05. The operator rotates each small-diameter pipe and repeats steps S02-S04 until all the welded circumferential seams of the small-diameter pipes have been inspected.

[0013] Furthermore, in step S05, when the diameter of the small-diameter pipe is less than 40mm, the operator rotates the small-diameter pipe by 120° each time, for a total of three rotations.

[0014] Furthermore, in step S05, when the diameter of the small-diameter pipe is above 40mm, the operator rotates the small-diameter pipe by 180° each time, for a total of two rotations.

[0015] The beneficial effects achieved by this invention compared with the prior art are as follows: 1. The present invention provides a small-diameter pipe circumferential X-ray inspection device. The upper part of the outer periphery of two support plates is provided with multiple pipe grooves along the circumferential direction. A flaw detector capable of emitting X-rays in a ring is provided between the two support plates. A batch of small-diameter pipes are placed in the pipe grooves. The flaw detector in the area between them can perform X-ray inspection on all small-diameter pipes at one time, which can improve the efficiency of X-ray inspection. This invention provides a method for circumferential X-ray inspection of small-diameter pipes. By using a small-diameter pipe circumferential X-ray inspection device, radiographic inspection of small-diameter pipes is achieved, improving inspection efficiency. At the same time, it reduces the frequency of operation of the inspection machine, greatly extending its service life. It also reduces the contact time between workers and radiation sources, ensuring their health. 2. This invention reduces the frequency of employee operations, increases the number of tests per session, greatly reduces the frequency of flaw detector startup, and extends the service life of the flaw detector by more than 20%.

[0016] 3. The present invention is easy to operate, the device has a simple structure, and can be operated independently by flaw detection personnel. The entire flaw detection process is fast and convenient, and easy to maintain later. 4. The steel wire rope design can temporarily fix all small-diameter pipes, preventing them from falling off and causing injury to workers. Attached Figure Description

[0017] Figure 1 This is a front view of the small-diameter pipe circumferential X-ray detection device of the present invention; Figure 2 This is a side view of the small-diameter pipe circumferential X-ray detection device of the present invention; In the diagram: 1. Base, 2. Support plate, 3. Rope tethering hole, 4. Pipe groove, 5. Steel wire rope, 6. Tie rod, 7. Flaw detector, 8. Pull plate, 9. Bracket. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] In the description of the invention, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0020] Example 1 Taking the testing of a small-diameter pipe with a diameter of Φ25 as an example, such as Figure 1-2 As shown, this embodiment discloses a circumferential X-ray inspection device for small-diameter pipes, mainly including a base 1, a flaw detector 7, and two support plates 2. The base 1 is made of Q345R material with a specification of δ12. The base 1 includes an arc-shaped steel plate with a width of 1000±10mm. The bottom of the arc-shaped steel plate is welded with horizontally distributed tie plates 8 through vertical connecting plates to prevent tilting.

[0021] Two support plates 2 are symmetrically arranged front to back and vertically distributed on the base 1. Both support plates 2 are support ring plates with an inner diameter of Φ1000 and an outer diameter of Φ1250. The bottom outer periphery of the two support plates 2 rests on the arc-shaped surface of the base 1 and is fixedly connected by bolt assemblies. The outer periphery of the support plates 2 is circular. Multiple pipe grooves 4 are evenly distributed along the circumference in a 200° angle area on the upper part of the outer periphery of both support plates 2. In this embodiment, taking the simultaneous testing of 21 small-diameter pipes as an example, the number of pipe grooves 4 is 21. The diameter of the pipe groove 4 is slightly larger than the diameter of the small-diameter pipe. For example, if the pipe diameter is Φ25, the end diameter of the pipe groove 4 is Φ27. The depth of the pipe groove 4 is generally in the range of 80-110mm. In this embodiment, the depth is 80mm. The corresponding pipe grooves 4 on the front and back of the two support plates 2 are used to place the same small-diameter pipe. The inner sides of the two support plates 2 are fixed together by four tie rods near the pipe grooves 4.

[0022] Each support plate 2 has a steel wire rope 5 connected to the right side of its outer side and a rope-tying hole 3 on the left side. When the small-diameter pipe is placed in the pipe groove 4, the steel wire rope 5 is wrapped around the outside of the small-diameter pipe and fixed to the rope-tying hole 3, thereby fixing the small-diameter pipe to prevent it from falling off and causing damage.

[0023] In this embodiment, the flaw detector 7 is a conventional industrial X-ray flaw detector capable of emitting X-rays in a ring. The flaw detector 7 is located between two support plates 2. To facilitate the fixing of the flaw detector 7, a bracket 9 is provided in the middle area of ​​the base 1. The flaw detector 7 is mounted on the bracket 9, so that the X-ray source of the flaw detector 7 is located on the axis of the support plate 2.

[0024] Based on the aforementioned small-diameter pipe circumferential X-ray inspection device, taking the simultaneous inspection of 21 small-diameter pipes as an example, this embodiment also discloses a small-diameter pipe circumferential X-ray inspection method, including the following steps: S01. Place the front and rear ends of all small-diameter pipes in the corresponding pipe grooves 4 of the two support plates 2, and place each small-diameter pipe in sequence so that the weld circumferential seam of each small-diameter pipe is within the irradiation range of the flaw detector 7. S02. A film is pasted on the side of each small-diameter pipe welded circumferential seam area away from the flaw detector 7; steel wire ropes 5 on both sides are used to fix the two ends of the small-diameter pipe to prevent the pipe from falling off and causing damage. S03. Turn on the flaw detector 7. The flaw detector 7 emits X-rays in a ring. The double-wall double-image radiography method allows the X-rays to irradiate the welded circumferential seam area of ​​each small-diameter pipe and form an image on the film. S04. Turn off the flaw detector 7 and remove the film that has formed the image; S05. The operator rotates each small-diameter pipe by 120°. Repeat steps S02-S04 for a total of three rotations until all welded circumferential seams of the small-diameter pipes have been inspected.

[0025] The above scheme enables the use of a small-diameter pipe circumferential X-ray inspection device to perform flaw detection on small-diameter pipes. Compared with the previous single-pipe inspection method, which required 63 startups, it now only requires 3 startups. This embodiment improves the flaw detection efficiency by 21 times, reduces the frequency of startup of the flaw detector, greatly extends the service life of the flaw detector, and reduces the contact time between workers and radiation sources, ensuring their health.

[0026] Example 2 Taking the inspection of a small-diameter pipe with a diameter of Φ57 as an example, this embodiment discloses a circumferential X-ray inspection device for small-diameter pipes. Unlike Embodiment 1, when the pipe diameter is Φ57, the diameter of the end of the pipe groove 4 is Φ58, and the depth of the pipe groove 4 is 110mm. In this embodiment, taking the inspection of 25 small-diameter pipes at once as an example, the number of pipe grooves 4 is 25.

[0027] Based on the aforementioned small-diameter pipe circumferential X-ray inspection device, taking the simultaneous inspection of 25 small-diameter pipes as an example, this embodiment also discloses a small-diameter pipe circumferential X-ray inspection method, including the following steps: S01. Place the front and rear ends of all small-diameter pipes in the corresponding pipe grooves 4 of the two support plates 2, and place each small-diameter pipe in sequence so that the weld circumferential seam of each small-diameter pipe is within the irradiation range of the flaw detector 7. S02. A film is pasted on the side of each small-diameter pipe welded circumferential seam area away from the flaw detector 7; steel wire ropes 5 on both sides are used to fix the two ends of the small-diameter pipe to prevent the pipe from falling off and causing damage. S03. Turn on the flaw detector 7. The flaw detector 7 emits X-rays in a ring. The double-wall double-image radiography method allows the X-rays to irradiate the welded circumferential seam area of ​​each small-diameter pipe and form an image on the film. S04. Turn off the flaw detector 7 and remove the film that has formed the image; S05. The operator rotates each small-diameter pipe by 180°. Repeat steps S02-S04 for a total of two rotations until all welded circumferential seams of the small-diameter pipes have been inspected.

[0028] The above scheme enables the use of a small-diameter pipe circumferential X-ray inspection device to perform flaw detection on small-diameter pipes. Compared with the previous single-pipe inspection method, this embodiment improves the flaw detection efficiency by 25 times; at the same time, it reduces the frequency of turning on the flaw detector, greatly extending the service life of the flaw detector; and it reduces the contact time between workers and radiation sources, ensuring their health.

Claims

1. A circumferential X-ray inspection device for small-diameter pipes, characterized in that, Includes a base (1), the top surface of the base (1) is provided with two support plates (2) that are symmetrical in front and behind and vertically distributed. The outer periphery of the support plate (2) is circular. The upper part of the outer periphery of the two support plates (2) is provided with multiple pipe grooves (4) along the circumferential direction. The corresponding pipe grooves (4) of the two support plates (2) are used to place the same small diameter pipe. A flaw detector (7) capable of emitting X-rays in a ring is provided between the two support plates (2).

2. The small-diameter pipe circumferential X-ray inspection device according to claim 1, characterized in that, Multiple tube grooves (4) are evenly distributed along the circumferential direction in the 200° angle region of the outer periphery of the two support plates (2).

3. The small-diameter pipe circumferential X-ray inspection device according to claim 2, characterized in that, The support plate (2) has a steel wire rope (5) connected to the right side of its outer side and a rope-tying hole (3) on the left side. When the small-diameter pipe is placed in the pipe groove (4), the wire rope (5) is wrapped around the outside of the small-diameter pipe and fixed on the rope hole (3) to fix the small-diameter pipe.

4. The small-diameter pipe circumferential X-ray inspection device according to claim 1, characterized in that, The support plate (2) is a support ring plate, and the inner sides of the two support plates (2) are fixed together by 3-4 tie rods (6) near the pipe groove (4); The base (1) includes an arc-shaped steel plate, and the bottom of the arc-shaped steel plate is welded with horizontally distributed pull plates (8) through a vertical connecting plate. The bottom outer periphery of the two support plates (2) is fixedly connected to the arc-shaped surface of the base (1) by bolt assembly.

5. The small-diameter pipe circumferential X-ray inspection device according to claim 4, characterized in that, The base (1) has a support in the middle area, the flaw detector (7) is mounted on the support, and the X-ray source of the flaw detector (7) is located on the axis of the support plate (2).

6. The small-diameter pipe circumferential X-ray inspection device according to claim 1, characterized in that, The number of the tubes (4) is 20-25.

7. The small-diameter pipe circumferential X-ray inspection device according to any one of claims 1-6, characterized in that, The flaw detector (7) is an industrial X-ray flaw detector.

8. A method for circumferential X-ray inspection of small-diameter pipes, characterized in that, The method of using the small-diameter pipe circumferential radiographic inspection device according to any one of claims 1-7 to perform radiographic inspection on the weld circumferential seam of a small-diameter pipe includes the following steps: S01. Place the front and rear ends of the small-diameter pipe in the corresponding pipe grooves (4) of the two support plates (2), and place each small-diameter pipe in sequence so that the weld circumference of each small-diameter pipe is within the irradiation range of the flaw detector (7). S02. A film is pasted on the side of each small-diameter welded circumferential seam area away from the flaw detector (7); S03. Turn on the flaw detector (7). The flaw detector (7) emits X-rays in a ring. The X-rays irradiate the welded circumferential seam area of ​​each small-diameter pipe and form an image on the film. S04. Turn off the flaw detector (7) and remove the film that has formed the image; S05. The operator rotates each small-diameter pipe and repeats steps S02-S04 until all the welded circumferential seams of the small-diameter pipes have been inspected.

9. The method for circumferential X-ray inspection of small-diameter pipes according to claim 8, characterized in that, In step S05, when the diameter of the small-diameter pipe is less than 40mm, the operator rotates the small-diameter pipe by 120° each time, for a total of three rotations.

10. The method for circumferential X-ray inspection of small-diameter pipes according to claim 8, characterized in that, In step S05, when the diameter of the small-diameter pipe is 40mm or more, the operator rotates the small-diameter pipe by 180° each time, for a total of two rotations.

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