JP2004125450A - Piping inspection device and method - Google Patents

Abstract

An object of the present invention is to provide a piping inspection apparatus and a piping inspection method which are easy to mount and can be easily inspected while eliminating the influence of vibration, wind, and the like.
That is, the present invention provides:
(1) In a piping inspection apparatus having a collimator 5 and a measuring unit having a radiation photoreceptor 29 for recording a radiation transmission image of a pipe 6 to be inspected,
A pipe inspection apparatus, characterized in that a fixing member 20 and a holding member 19 that can be fixed by sandwiching the pipe 6 to be inspected are added to the measuring section.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a piping inspection device and a piping inspection method for inspecting a wall thickness and a defect of a piping.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a power plant or the like, a pipe covered with a heat insulating material or the like has its outer surface corroded by intrusion of rainwater or the like on its outer surface, and its inner surface has its inner wall thinned due to friction caused by a fluid. Also, cracks occur in the piping at places where there is a lot of vibration. In order to inspect this pipe, it was necessary to install a scaffold up to the pipe, especially in a pipe laid at a high place.
[0003]
In order to cope with the occurrence of the trouble, a defect inspection of the piping is regularly performed, and a radiation inspection using a radioisotope (RI) that emits γ rays or the like is performed in the heat-retaining piping. However, in the conventional radiation inspection, when photographed from above the heat insulating material, radiation emitted from the collimator 5 passes through the pipe 6 to be inspected, and the radiation image data of the pipe is applied as a shadow picture to an X-ray film as a radiation photoreceptor. At the time of recording, the image is recorded on the X-ray film in a blurred state as image data because the distance is increased by the insulation thickness. Since the obtained image is not so clear, the inspection target pipe main body 6b is often inspected with the heat insulating material removed.
[0004]
When the piping inspection is performed with the heat insulating material removed, there is a disadvantage that the operation is restricted, and it takes time and cost to remove the heat insulating material and re-heat the material. In addition, the removed insulation must be disposed of as industrial waste.
[0005]
In recent years, a technique has been established in which radiation of a radioisotope (RI) such as γ-ray is emitted to the radiation photoreceptor 29 and transmission image data of an object is recorded on the radiation photoreceptor 29. In the method using the radiation photosensitive member 29, even when the image is taken from above the heat insulating material, it is possible to correct the influence of the heat insulating material in an apparatus (computed radiography) that processes the radiation photosensitive member 29.
However, when photographing with the heat insulating material removed or when photographing from above the heat insulating material, the position of the inspection target pipe 6 is positioned between the collimator 5 and the radiation photoreceptor 29, and the measuring unit A means for fixing was required. However, these methods have difficulty in positioning and are not a method of measuring with the pipe 6 to be inspected sandwiched by any means, and thus have a disadvantage that they are easily affected by vibration, wind, and the like.
As a conventional positioning method, a method has been proposed in which a measurement unit is moved to a pipe 6 to be inspected using an articulated arm (see Patent Documents 1 and 2). It is considered to be affected by vibration, wind, etc. In addition, the adoption of the articulated arm complicates the entire apparatus, and an electric motor is used for expansion and contraction of the articulated arm. In some cases, it is necessary to use an explosion-proof product for the electric motor.
[0006]
[Patent Document 1]
JP-A-9-89810 [Patent Document 2]
Japanese Patent Application Laid-Open No. 9-89811
[Problems to be solved by the invention]
In view of the above circumstances, an object of the present invention is to fix the position of the pipe 6 to be inspected by the measuring unit, thereby removing the influence of vibration, wind, and the like at the time of photographing, and simplifying the pipe at a high place. It is an object of the present invention to provide a piping inspection apparatus and a piping inspection method that can be easily inspected and are lightweight and easy to handle.
[0008]
[Means for Solving the Problems]
That is, the present invention
(1) In a pipe inspection apparatus having a collimator 5 and a measurement unit including a radiation photoreceptor 29 for recording a radiation transmission image of the pipe 6 to be inspected,
A fixing member 20 and a holding member 19 that can be fixed by sandwiching the inspection pipe 6 are added to the measuring section.
(2) In the above (1), the fixing member 20 and the pressing member 19 are urged toward the fixing member 20 provided on the radiation photoreceptor 29 side and the pressing member 19 provided opposite thereto. It is preferable to provide a resilient member 22.
(3) In the above (1) and (2), compressed air may be used as power for separating the fixing member 20 and the pressing member 19 from each other in order to sandwich the pipe 6 to be inspected.
(4) In the above (1), (2), and (3), it is preferable to add a moving unit that brings the measurement unit closer to the inspection target pipe 6.
(5) In the above (4), it is preferable to use a telescopic multiple arm 7 as a moving means.
(6) In the above (5), compressed air may be used as a power source for expanding and contracting the multiple arm 7.
(7) In the above (4), (5), and (6), the measuring section is attached to the moving means so as to be variable in angle, so that horizontal and vertical pipes can be inspected.
(8) In a pipe inspection method including a pipe inspection apparatus having a measurement unit including a collimator 5 and a radiation photoreceptor 29 that records a radiation transmission image of the pipe 6 to be inspected, the inspection pipe 6 is sandwiched between the measurement units. Inspection is performed by using a fixing member 20 and a holding member 19 that can be fixed by using the pipe 6 to be inspected.
(9) In the pipe inspection method of the above (8), when the pipe 6 to be inspected is clamped, the measuring unit may be moved to the pipe 6 to be inspected by using the multi-arm 7 that can be extended and retracted.
(10) In the above (9), compressed air may be used as a power source for expansion and contraction of the multiple arm 7.
[0009]
The measurement unit includes the collimator 5 for performing a pipe inspection and the radiation photoreceptor 29, and is a central part of the measurement. In the present application, a fixing member 20 and a holding member 19 capable of directly fixing the measuring unit to the inspection pipe 6 by sandwiching the inspection pipe 6 are added to the measurement unit.
[0010]
The pipe to be inspected 6 refers to a pipe itself to be inspected with the heat insulating material removed (inspection pipe main body 6b) or a pipe covered with a heat insulating material 6a.
[0011]
The multiplex arm 7 used in the present invention has a structure in which an arm having a hollow inside is incorporated with an arm of the same shape having a slightly smaller outer periphery, and the arm incorporated by an external operation is used as an object to be inspected. This is a mechanical component having a mechanism for pushing out toward the side.
Since the multiple arm 7 has such a mechanism, it is possible to easily bring the measuring unit closer to the inspection target pipe 6 at a high place.
[0012]
Compressed air is used to extend the multiple arm 7. When the compressed air is supplied, the arm accommodated therein extends outward, and stops at a substantially constant position due to the balance between air leakage and supply.
In order to contract the extended arm, if the supply of compressed air is stopped, the arm is contracted due to air leakage and gravity. Note that, here, the balance between factors that easily change the air leakage and the supply of the compressed air is balanced. However, since the measuring unit is sandwiched and fixed to the inspection pipe 6 by the holding member 19 and the fixing member 20, it is fixed. There is no problem in the measurement.
[0013]
The collimator 5 is a lead shielding tool used by being attached to the tip of the radiation source transmission tube 23, and for limiting the irradiation direction and the irradiation range necessary for radiography. Radioactive isotope (RI) gamma rays (iridium 192, cobalt 60) are mainly used as the radiation source. The period during which the radiation transmission capacity is halved is 74 days for iridium 192, and 5.3 years for cobalt 60, which is the period of use of γ-rays. One of the advantages of using γ-rays is that electricity is not used in nondestructive inspection, which is a great advantage for measurement in a place where flammable materials with a high risk of fire are handled.
[0014]
FIG. 1 shows an image diagram of a pipe inspection apparatus according to the present invention. In the present invention, radiation is irradiated from the collimator 5 toward the pipe 6 to be inspected, and the radiation transmission image data of the pipe is recorded on the radiation photoreceptor 29 stored in the film holder 13. In FIG. 1, reference numeral 6b denotes a pipe body to be inspected, and 6a denotes a pipe insulation material.
The radiation isotope (RI) that emits radiation in the collimator 5 is stored in the radiation source container 26 as a capsule. By turning the handle of the operation device (controller) 28, the capsule is transmitted through the radiation source transmission tube 23 by sending out a wire built in the operation tube 30, and is transferred to the collimator 5, and the imaging is started. The digital radiation image inspection system extracts the image data from the radiation photoreceptor 29 as an optical signal by laser beam scanning, converts it into an electric signal (digital), and performs image processing suitable for the purpose of inspection on a CRT screen. Inspection result information of the inspected pipe 6 can be obtained. This image data is converted into a transmission photograph by computer processing of a digital radiographic image inspection system. It is also possible to save on a recording medium such as an optical disk. In addition, a radiographic film can be used as the radiation photoreceptor 29, and a transmission photograph can be formed by development processing.
[0015]
[Action]
The piping inspection device of the present invention can inspect not only horizontal piping but also vertical piping. Further, since compressed air is used as a power source of the multiplex arm 7, electric spark does not occur as in the case of using an electric motor. Therefore, it is safe even in a place where flammable gas exists. The adoption of the multiple arm 7 in the pipe inspection device has made it possible to reduce the weight. Thereby, workability can be improved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows an image diagram of a pipe inspection apparatus according to the present invention.
FIG. 2 is a side view of the piping inspection device of the present application,
FIG. 3 is a front view of the piping inspection device of the present application.
Note that FIGS. 2 and 3 illustrate the state before the multiplex arm 7 is extended.
FIG. 4 shows a bogie with handrails for a pipe inspection device.
The measuring unit includes a holding member 19 and a fixing member 20 at positions sandwiching the collimator 5, the piping 6 to be inspected for clamping the piping 6 to be inspected, and the collimator 5 and the piping 6 to be clamped when the piping 6 to be inspected is clamped. And a film holder 13 which is a mounting plate for the radiation photoreceptor 29. In FIG. 2, the inspection target pipe 6 is illustrated as having various shapes.
The fixing member 20 and the holding member 19 are made of, for example, a metal pipe (hereinafter, these are collectively referred to as a pipe clamp 12), and this metal pipe is covered with rubber or the like to protect the pipe insulation material 6a for inspection from deformation. Has been done. An elastic member 22 is provided between the fixing member 20 and the pressing member 19, and the elastic member 22 urges the fixing member 20 and the pressing member 19 to be close to each other. An air expansion member 27 composed of an air piston into which compressed air is introduced for expanding the elastic member 22 and increasing the distance between the fixing member 20 and the pressing member 19 is provided between the fixing member 20 and the pressing member 19. As the elastic member 22, for example, a leaf spring, a coiled spring, rubber, or the like is used. The elastic member 22 is urged / opened when the air piston pressure reducing valve switch 11 is turned on / off, and the fixed member 20 and the pressing member 19 pinch or open the pipe 6 to be inspected.
Further, it is necessary to adjust the radiation irradiation distance between the collimator 5 and the film holder 13 as necessary according to the size of the pipe 6 to be inspected. For this reason, the collimator 5 is attached to the collimator attachment position elastic member 15.
The moving means of the measuring unit includes the multiplex arm 7, the support member 24 attached to the multiplex arm 7 via a movable shaft, the fixture 1 for the pipe inspection device main body attached to the support member 24, and the fixture 1 for the pipe inspection device main body. A handle 3 for fixing the main body to be attached to the handrail pipe 2 of the boiler, a telescopic auxiliary support member 25 provided between the multiple arm 7 and the support member 24, and an auxiliary support according to the angle adjustment of the multiple arm 7. The arm 25 includes an arm swing lock 8 for fixing and releasing the expansion and contraction of the member 25. The measurement unit is attached to the tip drive unit 10 of the multiplex arm 7 so as to swing freely (angle can be changed), and the swing operation is performed by a swing operation handle 9. This makes it possible to inspect both horizontal and vertical piping. Further, below the multi-arm 7, an air inlet / outlet 14 for introducing / deriving compressed air for expanding / contracting the multi-arm is provided.
In order to enable the expansion and contraction of the multi-arm 7 and the air expansion member 27, the operation switch 4 of the multi-arm expansion and contraction pressure reducing valve in the multi-arm 7 and the operation switch 11 of the air piston pressure reducing valve in the air expansion member 27 are turned on. Operate by cutting. The supply of air for this purpose is provided by a compressed air tank 17 installed for the purpose of temporarily storing compressed air produced by the compressor.
The pipe inspection device includes a radiation source transmission pipe 23, a measuring unit, and a moving unit. The measuring unit can be removed from the moving means. When a person can lift the measuring unit and install it on the pipe 6 to be inspected, the moving means is removed and the radiation source comprising the radiation source transmission pipe 23 and the radiation source container 26 is removed. Piping inspection can be performed at the supply unit and the measurement unit. A compressed air tank 17 is mounted on a bogie body 18 with a handrail for a pipe inspection device, and a handrail 16 for mounting a pipe inspection device, which is appropriately used, is also mounted.
[0017]
When the measuring unit can be manually set on the pipe 6 to be inspected, the following procedure is performed.
Set 1. The radiation photosensitive member 29 stored in the film cassette is attached to the film holder 13. Attachment is performed by attaching a magic tape (registered trademark) to the film cassette, or by restricting the film cassette to the film holder 13 with a gum tape or a rubber band.
2. Point the measuring part at the position to be inspected.
3. The compressed air is supplied to the air piston of the air expanding member 27 to expand the elastic member 22 and open the space between the fixing member 20 and the pressing member 19.
4. The variable stopper 21 is adjusted according to the thickness of the pipe 6 to be inspected. Next, if the inspection pipe 6 is interposed between the holding member 19 and the fixing member 20 of the measuring section, and the air of the air expansion member 27 is released, the inspection pipe 6 is sandwiched by the bias of the elastic member 22. .
Shooting 5. By turning the handle of the operating device (controller) 28, a radioisotope (RI) emitting γ-rays or the like is transmitted to the collimator 5 via the radiation source transmission tube 23.
6. The inspection pipe 6 is irradiated with the radiation from the collimator 5, and data is recorded on the radiation photosensitive member 29.
7. At the same time as the end of imaging, the handle of the operation device (controller) 28 is turned, and a radioisotope (RI) that emits γ-rays or the like is stored in the radiation source container 26.
8. The data of the radiation photoreceptor 29 is taken out as an image on a CRT (not shown) or recorded on a film or the like.
[0018]
In the inspection at a high place, the pipe inspection device is set on the pipe 6 to be inspected in the following procedure.
(1) Insert the concave portion of the pipe inspection device main body fixing tool 1 into the pipe inspection device taking handrail 16 of the pipe inspection device handrail carriage main body 18 of the pipe inspection device, and tighten and fix the main body fixing handle 3. The same method is used when attaching to the existing handrail pipe 2.
(2) While moving the bogie body 18 with handrails for the pipe inspection device, the pipe 6 to be inspected is oriented in the photographing direction. When the photographing position is determined, a tire fixing lever (not shown) of the bogie body 18 with a handrail for a pipe inspection device is locked.
(3) Compressed air is supplied to the air piston of the air expanding member 27 to extend the elastic member 22 and open the space between the fixing member 20 and the pressing member 19.
(4) The arm swing lock 8 is released, the angle of the multiple arm 7 is adjusted in the direction of the pipe 6 to be inspected, and the arm swing lock 8 is locked.
(5) Operate the operation switch 4 of the multi-arm expansion / contraction pressure reducing valve to introduce compressed air into the multi-arm 7 and extend the multi-arm 7 until the measuring unit such as the collimator 5 comes near the pipe 6 to be inspected.
(6) Adjust the angle of the tip drive unit 10 by the head swing operation handle 9.
(7) Operate the operation switch 11 of the air piston pressure reducing valve to operate the operation switch 11 of the air piston pressure reducing valve. Then, the air pressure is cut off, and the pipe 6 to be inspected is clamped and fixed by the pipe clamp 12 by the force of the elastic member 22.
Now that the preparation for the inspection is completed, the operation proceeds to the inspection.
A radioisotope (RI) that emits γ-rays or the like from the radiation source transmission pipe 23 is transmitted to the collimator 5, and the radiation from the collimator 5 irradiates the pipe 6 to be inspected and data is recorded on the radiation photoreceptor 29. Become.
[0019]
When the photographing is completed, the procedure is completed in the following procedure.
(1) By operating the operation switch 11 of the pressure reducing valve for the air piston, the pipe clamp 12 is pushed and expanded by the air pressure, and the pipe clamp 12 is removed from the pipe 6 to be inspected.
(2) The angle of the tip end drive unit 10 is returned to the original position by the head swing operation handle 9. Next, the arm swing lock 8 is released.
(3) By operating the operation switch 4 of the multi-arm expansion / contraction pressure reducing valve, the multi-arm 7 is contracted to return the measuring unit such as the collimator 5 to the original position.
(4) Loosen the main body fixing handle 3 and separate the handrail pipe 2 from the concave portion of the main body fixing tool 1.
[0020]
【The invention's effect】
(1) Since the pipe inspection device of the present invention performs inspection while being clamped and fixed to the pipe 6 to be inspected, it is possible to eliminate the influence of vibration, wind, and the like, and to easily perform the alignment and mounting work of the inspection device. It will be easier.
(2) The pipe inspection device of the present invention can perform a pipe inspection without using a scaffold to the pipe, particularly in a pipe laid at a high place by using the multiple arm 7.
(3) The pipe inspection device of the present invention can inspect the pipe heat insulating material 6a of the pipe without removing it, without removing the pipe insulation material 6a, and can save time and labor associated with the removal.
(4) By introducing the present inspection method, there is no generation of industrial waste due to waste material accompanying removal of the inspected pipe heat insulating material 6a.
(5) Since the inspection can be easily performed without removing the heat insulating material, the number of inspections can be increased, and the maintenance and inspection can be easily performed even during the operation of the facility.
[0021]
Since the pipe inspection device of the present invention has various excellent performances as described above, it is possible to inspect many pipes such as a thermal power plant, a petrochemical plant, and a chemical synthesis plant, and has these facilities. It greatly contributes to the industry.
[Brief description of the drawings]
FIG. 1 is an image diagram of a pipe inspection device.
FIG. 2 is a side view of the pipe inspection device.
FIG. 3 is a front view of the pipe inspection device.
FIG. 4 is a side view of a bogie with handrails for a pipe inspection device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plumbing inspection device main body fixture 2 Handrail pipe 3 Main body fixing handle 4 Operation switch of multi-arm expansion / contraction pressure reducing valve 5 Collimator 6 Inspection pipe 6a Inspection pipe insulation material 6b Inspection pipe main body 7 Multiple arm 8 Arm swing lock 9 Head swing operation handle 10 Tip drive unit 11 Operation switch of pressure reducing valve for air piston 12 Pipe clamp 13 Film holder 14 Air inlet / outlet 15 Collimator mounting position expansion / contraction member 16 Handrail for pipe inspection device installation 17 Compressed air tank 18 Pipe inspection Apparatus handrail carriage 19 Holding member 20 Fixed member 21 Variable stopper 22 Elastic member 23 Radiation source transmission tube 24 Support member 25 Auxiliary support member 26 Radiation source container 27 Air extension member 28 Controller (controller)
29 Radiation photoreceptor 30 Operation tube

Claims (10)

In a pipe inspection apparatus having a collimator and a measurement unit composed of a radiation photoreceptor that records a radiation transmission image of a pipe to be inspected,
A pipe inspection apparatus, wherein a fixed member and a holding member that can be fixed by sandwiching a pipe to be inspected are added to the measuring section. 2. The fixing device according to claim 1, wherein the fixing member provided on the radiation photoreceptor side and the pressing member provided opposite to each other are provided with an elastic member for urging the fixing member and the pressing member to approach each other. Plumbing inspection equipment. 3. The piping inspection apparatus according to claim 1, wherein compressed air is used as a power for separating an interval between the fixing member and the holding member so as to sandwich the inspection pipe. 4. The pipe inspection apparatus according to claim 1, further comprising a moving unit that moves the measurement unit closer to the pipe to be inspected. 5. The piping inspection apparatus according to claim 4, wherein the moving means is a telescopic multiple arm. 6. The piping inspection apparatus according to claim 5, wherein compressed air is used as a power source for expanding and contracting the multiple arms. 7. The piping inspection device according to claim 4, wherein the measuring unit is attached to the moving means so as to change the angle, and can inspect horizontal and vertical piping. In a pipe inspection method including a collimator and a pipe inspection apparatus having a measurement unit formed of a radiation photoreceptor that records a radiation transmission image of a pipe to be inspected, fixing can be performed by sandwiching the pipe to be inspected in the measurement unit. A pipe inspection method, wherein the inspection is performed in a state where a pipe to be inspected is clamped using a member and a holding member. 9. The pipe inspection method according to claim 8, wherein, when the pipe to be inspected is clamped, the measuring unit is moved to the pipe to be inspected by using a multi-arm that can expand and contract. 10. The piping inspection method according to claim 9, wherein compressed air is used as a power source for multiple arm expansion and contraction.

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