Radiation inspection heat insulation device for small-pipe-diameter high-temperature pipeline and inspection method thereof

Abstract

The invention relates to the field of pipeline radiographic inspection, in particular to a small-pipe-diameter high-temperature pipeline radiographic inspection heat insulation device and an inspection method.The device comprises a ray machine, a film, a heat insulation box and an air cooling device, the ray machine is arranged on one side of a small-pipe-diameter pipeline, and the ray machine is used for emitting rays to the small-pipe-diameter pipeline; the rubber sheet is arranged on the other side of the small-diameter pipeline, the heat insulation box is arranged between the small-diameter pipeline and the rubber sheet and communicated with the air cooling device, and the air cooling device conveys compressed air into the heat insulation box to cool the heat insulation box. The hard hollow heat insulation box is used for conducting heat insulation on the high-temperature pipeline, deformation is not prone to occurring, field operation is easy and convenient, flowing compressed air is used for cooling, the cooling effect is obvious, and meanwhile the negative film quality of radiographic inspection and the inspection result are not affected at all.

Description

Technical Field

[0001] The invention relates to the field of pipeline radiographic inspection, and in particular to a small-diameter high-temperature pipeline radiographic inspection heat insulation device and an inspection method thereof. Background Art

[0002] Radiographic flaw detection is a volume inspection method that uses X-rays, gamma rays, neutron rays, etc. that can penetrate materials and have attenuation characteristics in materials to find defects. It has been fully applied in nuclear and non-nuclear fields. Its characteristics are that film is used as a recording medium, which can obtain a direct image of the defect, and the film can be preserved for a long time. Radiographic film should be stored in a low temperature and dry place. The best storage conditions for film are a temperature of less than 20°C and a humidity of less than 60%. High temperature and high humidity should be strictly avoided. When the temperature is too high, it will have a cumulative effect on the photosensitive properties of the film and cause irreversible damage.

[0003] During operation, small-diameter pipelines in nuclear power plants may be subject to penetration defects due to vibration and corrosion, leading to leakage of media in the pipelines and abnormal shutdown of the unit, causing huge economic losses to the nuclear power plant and society. The operating temperature of small-diameter pipelines at the operation site of a nuclear power plant can reach up to about 200°C. When sudden leakage occurs during operation, the pipeline needs to be inspected online in a high-temperature operating environment after maintenance. In the prior art, in order to solve the problem of damage to X-ray film under high-temperature conditions, a flexible insulation layer is generally added between the film used for high-temperature X-ray detection and the wall of the high-temperature pipeline. The insulation layer uses glass or glass fiber as the insulation material, which will affect the detection effect. Therefore, it is necessary to develop a small-diameter high-temperature pipeline X-ray inspection insulation device. Summary of the invention

[0004] The present invention provides a small-diameter high-temperature pipeline radiographic inspection heat insulation device and an inspection method thereof, which are used to solve the problem in the prior art that when online radiographic inspection is performed on a small-diameter pipeline, the film heat insulation device may affect the inspection result.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention proposes a thermal insulation device for X-ray inspection of small-diameter high-temperature pipelines, which includes a X-ray machine, a film, a thermal insulation box and an air cooling device. The X-ray machine is arranged on one side of the small-diameter pipeline, and is used to emit radiation to the small-diameter pipeline; the film is arranged on the other side of the small-diameter pipeline, the thermal insulation box is arranged between the small-diameter pipeline and the film, the thermal insulation box is connected to the air cooling device, and the air cooling device cools the thermal insulation box by conveying compressed air into the thermal insulation box.

[0007] In some embodiments, the insulation box is a hard hollow box body, the front of the insulation box is close to the outer wall of the small diameter pipe, and a film is set on the back; air inlets and air outlets are respectively provided on both sides of the insulation box, and the air inlets and air outlets are used to circulate air to take away the heat of the small diameter pipe.

[0008] In some embodiments, the heat insulation box is welded by stainless steel plates.

[0009] In some embodiments, the stainless steel plate has a thickness of 1 mm.

[0010] In some embodiments, the air inlet is connected to an air compressor, which delivers compressed air to the insulation box.

[0011] In some embodiments, a quick connector is provided on the air compressor, and the quick connector is connected to the air inlet through a hose.

[0012] In some embodiments, the film is connected to a back screen on the other side facing the small diameter pipe.

[0013] The present invention proposes a radiographic inspection method for small-diameter high-temperature pipelines, the method comprising:

[0014] Step 1: Arrange and fix the X-ray machine on one side of the small diameter pipeline;

[0015] Step 2: Perform radiographic inspection on the insulation box to ensure that there are no defects in the insulation box;

[0016] Step 3: Fix the heat insulation box on the opposite side of the small-diameter pipe X-ray machine so that the heat insulation box is close to the outer wall of the small-diameter pipe;

[0017] Step 4: Use a hose to connect the air inlet of the insulation box and the quick connector of the air compressor;

[0018] Step 5: Operate the air compressor to input compressed air into the insulation box, and the compressed air is discharged from the air outlet of the insulation box until the surface temperature of the insulation box drops to a temperature that is not affected by the film;

[0019] Step 6: Place film and back screen on the back of the insulation box and perform X-ray inspection.

[0020] In some embodiments, in step five, the surface temperature of the insulation box is reduced to a temperature at which the film is not affected, and specifically, the surface temperature of the insulation box is reduced by 25-35 degrees Celsius.

[0021] The implementation of the present invention has the following beneficial effects

[0022] The present invention provides a ray inspection heat insulation device for small-diameter high-temperature pipelines and an inspection method thereof. The present invention uses a rigid hollow heat insulation box to insulate the high-temperature pipeline, which is not easily deformed, is simple to operate on-site, and uses flowing compressed air for cooling, with an obvious cooling effect. At the same time, it has no impact on the quality of the radiographic film and the inspection results of ray inspection. The design of using compressed air to carry away the heat of the pipeline to protect the ray film; the design of using the magnitude of the compressed air flow to control the magnitude of the pipeline heat. Brief Description of the Drawings

[0023] Figure 1 Schematic diagram of a ray inspection heat insulation device for small-diameter high-temperature pipelines proposed in an embodiment of the present invention;

[0024] Brief Description of the Drawings: 1. circumferential weld; 2. ray machine; 3. heat insulation box; 4. small-diameter pipeline; 5. quick connector; 6. air compressor; 7. hose; 8. air inlet; 9. air outlet; 10. film; 11. back screen. Detailed Description of the Invention

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] As Figure 1 shown, the present invention provides a ray inspection heat insulation device for small-diameter high-temperature pipelines. The device includes a ray machine 2, a circumferential weld 10, a heat insulation box 3, and an air cooling device. The ray machine 2 is arranged on one side of the small-diameter pipeline 4, and the ray machine 2 is used to emit rays to the small-diameter pipeline 4; the circumferential weld 10 is arranged on the other side of the small-diameter pipeline 4, the heat insulation box 3 is arranged between the small pipeline and the circumferential weld 10, and the circumferential weld 10 is connected to the back screen 11 on the other side facing the small-diameter pipeline 4.

[0027] The heat insulation box 3 is a rigid hollow box body, welded by a 1mm-thick stainless steel plate. The front of the heat insulation box 3 is closely attached to the outer wall of the small-diameter pipeline 4, and its back is provided with a circumferential weld 10; air inlets 8 and air outlets 9 are respectively arranged on both sides of the heat insulation box 3, and the air inlets 8 and air outlets 9 are used for air to flow through and carry away the heat of the small-diameter pipeline 4.

[0028] The heat insulation box 3 is connected to an air compressor 6. A quick connector 5 is provided on the air compressor 6, and the quick connector 5 is connected to the air inlet 8 through a hose 7. The air compressor 6 delivers compressed air to the heat insulation box 3.

[0029] In the prior art, glass or glass fiber is used as the heat insulation material in the heat insulation device, which has an impact on the ray inspection results. The present invention proposes a ray inspection heat insulation device for small-diameter high-temperature pipelines. In the present invention, a rigid hollow heat insulation box 3 is used, which is not easily deformed, is simple to operate on site, and is cooled by flowing compressed air, with an obvious cooling effect. At the same time, it has no impact on the quality of the ray inspection film and the inspection results.

[0030] The present invention proposes a ray inspection method for small-diameter high-temperature pipelines, which includes:

[0031] Step 1: Arrange and fix a ray machine 2 on one side of the small-diameter pipeline 4.

[0032] Step 2: Conduct a ray inspection on the heat insulation box 3 to ensure that the heat insulation box 3 has no defects.

[0033] Step 3: Fix the heat insulation box 3 on the opposite side of the ray machine 2 of the small-diameter pipeline 4, so that the heat insulation box 3 is closely attached to the outer wall of the small-diameter pipeline 4.

[0034] Step 4: Connect the air inlet 8 of the heat insulation box 3 and the quick connector 5 of the air compressor 6 with a hose 7 to ensure good airtightness of the connection.

[0035] Step 5: Operate the air compressor 6 to input compressed gas into the heat insulation box 3, and the compressed gas is discharged from the air outlet 9 of the heat insulation box 3 until the surface temperature of the heat insulation box 3 is reduced to 25-35 degrees Celsius.

[0036] Step 6: Place the circumferential weld 10 and the back screen 11 on the back of the heat insulation box 3 and conduct a ray inspection.

[0037] The above embodiments only express several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A small-diameter high-temperature pipeline radiation inspection and heat insulation device, characterized in that: The device comprises a ray machine (2), a film (10), a heat insulation box (3) and an air cooling device. The ray machine (2) is arranged on one side of a small-diameter pipe (4), and the ray machine (2) is used to emit rays into the small-diameter pipe (4); the film (10) is arranged on the other side of the small-diameter pipe, the heat insulation box (3) is arranged between the small-diameter pipe (4) and the film (10), and the heat insulation box (3) is connected to the air cooling device, and the air cooling device cools the heat insulation box (3) by conveying compressed air into the heat insulation box (3).

2. A small-diameter high-temperature pipeline radiographic inspection and heat insulation device according to claim 1, characterized in that: The heat-insulating box (3) is a hard hollow box body, the front side of the heat-insulating box (3) is in close contact with the outer wall of the small-diameter pipe (4), and the back side of the heat-insulating box (3) is provided with the film (10); the two sides of the heat-insulating box (3) are respectively provided with an air inlet (8) and an air outlet (9), and the air inlet (8) and the air outlet (9) are used to circulate air to remove the heat of the small-diameter pipe (4).

3. A small-diameter high-temperature pipeline radiographic inspection and heat insulation device according to claim 2, characterized in that: The heat insulation box (3) is formed by welding stainless steel plates.

4. A small-diameter high-temperature pipeline radiographic inspection and heat insulation device according to claim 3, characterized in that: The thickness of the stainless steel plate is 1 mm.

5. The small-diameter high-temperature pipeline radiographic inspection and heat insulation device according to claim 2 is characterized in that: The air cooling device is an air compressor, the air inlet (8) is connected to the air compressor (6), and the air compressor (6) delivers compressed air to the heat insulation box (3).

6. A small-diameter high-temperature pipeline radiographic inspection and heat insulation device according to claim 5, characterized in that: The air compressor (6) is provided with a quick connector (5), and the quick connector (5) is connected to the air inlet (8) via a hose (7).

7. The small-diameter high-temperature pipeline radiographic inspection and heat insulation device according to claim 1 is characterized in that: The film (10) is connected to a back screen (11) on the other side facing the small-diameter pipe (4).

8. A small diameter high temperature pipeline radiographic inspection method according to any of claims 1 to 7, characterized in that: The method comprises: Step 1: Arrange and fix the X-ray machine (2) on one side of the small-diameter pipe (4); Step 2: Performing a radiographic inspection on the heat insulation box (3) to ensure that the heat insulation box (3) has no defects; Step 3: Fix the heat-insulating box (3) on the side of the small-diameter pipe (4) opposite to the X-ray machine (2), so that the heat-insulating box (3) is closely attached to the outer wall of the small-diameter pipe (4); Step 4: Use a hose (7) to connect the air inlet (8) of the heat insulation box (3) and the quick connector (5) of the air compressor (6); Step 5: operate the air compressor (6) to input compressed gas into the interior of the heat insulation box (3), and the compressed gas is discharged from the air outlet (9) of the heat insulation box (3) until the surface temperature of the heat insulation box (3) drops to a temperature that is not affected by the film (10); Step six: Place the film (10) and the back screen (11) on the back of the heat-insulating box (3), and carry out a radiographic inspection.

9. A small diameter high temperature pipeline radiographic inspection method according to claim 8, characterized in that: In the step 5, the surface temperature of the heat-insulating box (3) is lowered to a temperature at which the film (10) is not affected, and specifically the surface temperature of the heat-insulating box (3) is lowered to 25-35 degrees Celsius.

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