WO2011033677A1

WO2011033677A1 - Defect detecting device

Info

Publication number: WO2011033677A1
Application number: PCT/JP2009/066459
Authority: WO
Inventors: 上野秀雄
Original assignee: 株式会社サンフロイント
Priority date: 2009-09-19
Filing date: 2009-09-19
Publication date: 2011-03-24
Also published as: AU2009352792A1

Abstract

A piping defect detecting device for inspecting a defect such as a crack in buried piping. A defect detecting device provided with an inside inspecting unit for detecting a defect located inside piping, and also with a piping defect detecting unit for detecting a leakage of oil from the defect detected by the inside inspecting unit. The piping defect detecting unit is provided with a first air plug, a second air plug connected to the first air plug through a flexible connecting member, and an air pressure supply means for supplying air to the first air plug, the second air plug, and a gap between the first and second air plugs.

Description

Defect detection device

The present invention relates to an internal investigation of an old buried pipe and a defect detection device for detecting a defect with a high possibility of oil leakage.

Currently, many buried tanks, various tanks such as above-ground tanks, vertical tanks, etc. are used, and these tanks are connected to a fuel filler port or a feed outlet by piping. In particular, when piping is buried underground, if defects such as cracks, pitting corrosion, and corrosion occur in the piping, oil leaks from the piping, which causes a problem. For example, an oil supply pipe is used when gasoline is injected into an underground tank used at a gas station, and an oil supply pipe is used when oil is supplied from the underground tank to the ground (automobile).

In this case, the oil supply pipe and the oil supply pipe are almost buried underground, and when they become old, cracks and the like occur, causing oil leakage. For example, Patent Literature 1 has been proposed as a method for solving such a problem. The present invention is an ultrasonic inspection method for detecting a discontinuous portion of the inspection object by irradiating the inspection object with ultrasonic waves, and is an invention for setting a defect inspection range of the inspection object and performing defect inspection. .

Japanese Patent Laid-Open No. 10-115605

However, in the conventional method, it is difficult to detect a defect that actually leaks oil by inspecting underground pipes. Therefore, the present invention makes it possible to inspect underground pipes buried underground, prevent oil leaks that cause soil contamination, etc., conduct internal investigations to inspect cracks, pitting corrosion, and corrosion of buried pipes, and more accurately It is an object of the present invention to provide a buried pipe defect detection device capable of detecting defects with oil leakage.

According to the present invention, the above-described problem includes an internal inspection unit that detects an internal defect of a pipe, and a pipe defect detection unit that detects oil leakage from the defect detected by the internal inspection unit, and the pipe defect The detection unit includes a first air plug, a second air plug connected to the first air plug via a flexible connecting member, the first air plug, and the second air plug; Air pressure supply means for supplying air to the gap between the first and second air plugs, and inserting the first and second air plugs into the pipe in the order of the first and second air plugs. After that, air is supplied from the air pressure supply means to the first air plug, presses against the pipe, and then pulls back the first air plug; and the air plug After pulling back the first air plug by the moving means, air is supplied from the air pressure supply means to the first air plug and the gap, and the first air plug is pressed against the pipe, This can be achieved by providing a defect detection device having detection means for detecting a pressure drop in the gap.

The present invention provides a defect detection device that can detect an accurate defect location and can detect a specific oil leakage location.

It is an external view of the internal inspection apparatus of this invention. It is a figure explaining the system configuration of an internal inspection device. It is a figure which shows the example which uses an internal inspection apparatus for piping inspection. It is a block diagram of the piping defect detection apparatus containing two air plugs. It is a figure which shows a part of work process using a piping defect detection apparatus. (A), (b) is a figure which shows a part of work process using the piping defect detection apparatus of this example. (A), (b) is a figure which shows a part of work process using the piping defect detection apparatus of this example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an external view of the internal inspection device. In FIG. 1, an internal inspection apparatus 1 includes a video scope 2 in which an optical adapter is detachable, a control unit 3 that houses the video scope 2, a monitor 5 that performs various displays, and a power supply unit 6. Yes.

FIG. 2 is a diagram for explaining the system configuration of the internal inspection apparatus 1. As shown in the figure, a fiber unit 7 is connected to the internal soundness investigation device 1. The fiber unit 7 is stored in the control unit 3 shown in FIG. 1, for example.
In addition, the video scope 2 includes a light source device for obtaining illumination light necessary for shooting and an electric bending device for bending the video scope 2 electrically freely. The captured image from the image sensor at the tip of the video scope 2 is supplied to the captured image processing unit 8.

In addition to the captured image processing unit 8, the control unit 3 includes a CPU 9, a ROM 10, a RAM 11, a LAN interface (hereinafter referred to as a LAN interface) 12, and a USB interface (hereinafter referred to as a USB interface) 13. , An input interface (hereinafter referred to as input I / F) 14, and a microphone input processing unit 15.

Also, the fiber unit 7 and the controller 4 described above are connected to the input I / F 14. The controller 4 performs drive control of the video scope 2.

Note that the USB I / F 13 is an interface when a USB memory is attached and the captured image data acquired by the internal soundness investigation device 1 is stored in the USB memory. The LAN I / F 12 is an interface for connecting a personal computer (PC).

The captured image processing unit 8 processes the captured image supplied from the video scope 2, performs processing necessary for displaying on the monitor 5, and further processes the processed captured image via the signal line. To record. The microphone input processing unit 15 is a processing unit for recording information collected by the microphone in the USB memory, and is configured to record audio information in the USB memory corresponding to the captured image.

Note that the CPU 9 performs processing according to the program stored in the ROM 10 and drives the internal soundness investigation device 1 using the RAM 11 as a work area. The ROM 10 stores image data of normal piping (standard sample) measured in advance, and the image data of the standard sample is used for comparison with measurement data, as will be described later.

In the above configuration, an example in which defect inspection is performed using the internal inspection apparatus 1 of the present example will be described below.
FIG. 3 shows an example of a lubrication pipe installed in a gas station or the like, which is a target of defect inspection. Usually, in order to detect such a defect in the lubrication pipe, for example, it was necessary to break concrete and dig a hole. However, in the case of this example, the defect detection of the lubrication pipe is performed as follows.
First, the video scope 2 is inserted from the oil inlet 26 of the oil pipe 22 as shown in FIG. Thereafter, the operator inspects cracks, pitting corrosion, and corrosion in the lubrication pipe 22 while operating the controller 4 described above. In this case, for example, a light emitting unit is provided at the tip of the video scope 2 to illuminate the inside of the oiling tube 22, and the inside of the oiling tube 22 is displayed on the monitor 5 described above. Therefore, the operator operates the controller 4 while looking at the monitor 5 and confirms cracks, pitting corrosion, and corrosion generated in the lubrication pipe 22.

At this time, the distal end of the video scope 2 can be flexibly bent, and the operator operates the controller 4 while looking at the monitor 5, so that the inner wall of the lubrication pipe 22 is sequentially cracked from the vicinity of the lubrication opening 26 of the lubrication pipe 22. I will check. Although the lubrication pipe 22 has

bent portions

32 and 33, the video scope 2 is configured flexibly as described above, and is curved according to the shape of the lubrication pipe 22 and provided at the end of the lubrication pipe 22. The inspection can be surely performed up to the position of the valve 28.

During this time, images captured by the video scope 2 are sequentially displayed on the monitor 5 and also recorded in the USB memory described above. Therefore, after the inspection is completed, the captured image recorded in the USB memory can be examined closely to confirm a minute crack or the like.

Specifically, as described above, the standard sample stored in the ROM 10 in advance and the captured image recorded in the USB memory are compared to identify cracks, pitting corrosion, and corrosion locations in the embedded pipe. Moreover, when the crack, pitting corrosion, or corrosion has generate | occur | produced, the distance and magnitude | size from the entrance of a buried piping to an occurrence location are specified.

Also, the identification of cracks, pitting corrosion, and corrosion shall be determined in consideration of the age of burial, surrounding environment, aging, etc.

The control unit 3 also has a function of enlarging the captured image, and an operator can display an enlarged image of the inner wall of the lubrication pipe 22 on the monitor 5 and record it in a USB memory as necessary. In addition, even minute cracks can be confirmed.
Furthermore, the operator can record voice information such as comments at the inspection target position via the microphone, which can be used as a reference when considering cracks and the like later.

As described above, after inspecting cracks, pitting corrosion, and corroded portions in the buried piping, it is inspected whether oil leakage or the like actually occurs from the cracks.
FIG. 4 is a diagram illustrating the oil leakage detection device of this example. In the figure,

reference numerals

37 and 38 denote air plugs. Here, 37 is a first air plug and 38 is a second air plug. A connecting pipe 39 is provided between the air plugs 37 and 38. The air plug 38 is provided with a pressing member 40 for moving the air plugs 37 and 38 in the pipe.

This pressing member 40 is provided with three pipes. These three pipes are pipes a to c as shown in the enlarged portion A of FIG. Here, the pipe a is a pipe for supplying air to the air plug 38. The pipe b is a pipe that supplies air to the air plug 37, and the pipe c is a pipe that supplies air to a gap formed between the air plugs 37 and 38. The outer periphery of the pressing member 40 is formed of a resin such as plastic, has strength, and can be bent flexibly to some extent. Therefore, as will be described later, the air plugs 37 and 38 can be pushed and moved in the buried piping, and at the bent portion of the piping, it can be bent according to the piping.

Further, two pipes b and c pass through the air plug 38 shown in FIG. 4, and the pipe b is connected to the connecting pipe 39. In addition, a valve c 'is provided at the tip of the pipe c, and air is supplied to a gap described later. The connection pipe 14 is formed using a flexible material, such as rubber, as shown in the enlarged portion C of FIG. 4, and a pipe for sending air to the air plug 37 is disposed inside. .

In the defect detection apparatus having the above configuration, the working process of this example will be described below.
FIG. 5 is a view showing a state in which the first and second air plugs 37 and 38 are inserted into the pipe from the oil filling port 26 of the oil filling pipe 22 described above. As shown in the figure, the air plugs 37 and 38 are in a contracted state because they are not pressurized, and are fed in the direction of the arrow through the oil supply pipe 22. Here, the air plugs 37 and 38 are moved by the pressing member 40 as described above.

Thereafter, when the air plugs 37, 38 are pushed by the pressing member 40, the air plugs 37, 38 pass through the bent portion D of the lubrication pipe 22 and enter the interior of the lubrication pipe 22. In addition, in the bending part D of the oil supply pipe | tube 22, since air is not injected into the air plugs 37 and 38, it can pass, changing a shape a little. Further, since the connecting pipe 40 is also made of a flexible material as described above, it moves together with the air plugs 37 and 38. Further, the pressing member 40 also has strength as described above and can be bent, so that it moves along the lubrication pipe 22.

Thereafter, when the air plugs 37 and 38 are continuously pressed, the air plugs 37 and 38 reach the end of the oil supply pipe 22. FIG. 6A shows this state. In addition, if the convex part 41 is provided in the inner wall of the edge part of the oil supply pipe | tube 22, the movement of the air plugs 37 and 38 will stop. Even if there is no configuration as described above, the positions of the air plugs 37 and 38 can be known by the memory provided in the pressing member 40.

After moving the air plugs 37 and 38 to the end of the lubrication pipe 22 in this way, air is first supplied only to the air plug 37 by a compressor (not shown). In this case, air is supplied through the pipe b described above. In FIG. 5B, the air plug 37 is pressurized by the air supply, and the air plug 37 is brought into pressure contact with the inner wall of the lubrication pipe 22.

In this state, when the pressing member 40 is pulled back, the air plug 37 moves in the arrow direction shown in FIG.
On the other hand, the connecting pipe 39 extends as the air plug 37 moves, but stops when the connecting pipe 39 is fully extended. That is, since the air plug 37 is in pressure contact with the inner wall of the oil supply pipe 22 as described above and the air plug 37 is fixed to the end of the oil supply pipe 22, the state shown in FIG.

In this state, air is then supplied to the air plug 38. In this case, air is supplied from a compressor (not shown) through the pipe a. FIG. 2B shows a state in which the air plug 38 is pressurized by the air supply and is pressed against the inner wall of the lubrication pipe 22. In this state, the gap 40 between the air plugs 37 and 38 is sealed.

Next, in this state, air is injected from the compressor into the gap 40 between the air plugs 37 and 38 through the pipe c. In this case, the air sent through the pipe c is supplied from the valve c ′ to the gap 40 and pressurizes the gap 40. Then, after pressurizing to a certain pressure, for example, a pressure gauge provided in the compressor is checked to determine a pressure drop. In this case, for example, if the measurement time after reaching a certain pressure and the permissible pressure range are set in advance and the pressure within the permissible pressure range is maintained within the time, there is no problem with the corresponding lubrication pipe 22. to decide.

On the other hand, after reaching a certain pressure, if the pressure falls below the allowable pressure range within the time, it can be seen that the crack in the oil supply pipe 22 in the corresponding range is a specific oil leak. That is, it can be determined that there is a defect such as a crack in the range of the gap 19 of the corresponding oil supply pipe 2 and oil has leaked from the defect such as the crack.

Therefore, it is possible to detect a defect in all locations of the lubrication pipe 2 by sequentially repeating the above processing up to the lubrication port 26 of the lubrication pipe 22. That is, after the above processing, the air plugs 37 and 38 are first evacuated, and the pressing member 40 is pulled out for a predetermined length (predetermined distance). This predetermined length corresponds to the length of the connection pipe 39. For example, if the length of the connection pipe 39 is 1 m, the pressing member 40 is pulled out at intervals of 1 m. Thereafter, the air plug 37 is pressurized, then the air plug 38 is pressurized, and then the gap 41 formed between the air plugs 37, 38 is pressurized. Also in this case, after pressurizing the gap 41, a pressure gauge provided in the compressor is checked to determine a pressure drop. Thereafter, the above process is repeated to detect a defect in the lubrication pipe 22 at regular intervals.

By processing as described above, it is possible to inspect defective portions of the oil supply pipe 22 at regular intervals, and it is possible to detect defective portions that actually leak through the above processing.
In addition, although the said example demonstrated the lubrication pipe | tube 22, a defect test | inspection can also be performed also about the underground piping in which gasoline, light oil, heavy oil, etc. flow.

DESCRIPTION OF SYMBOLS 1 ... Internal soundness investigation apparatus 2 ... Video scope 3 ... Control unit 4 ... Controller 5 ... Monitor 6 ... Power supply part 7 ... Fiber unit 8 ... Captured image Processor 9 ... CPU
10. ROM
11..RAM
12. ・ LAN de I / F
13. USB I / F
14. Input I / F
15. · Microphone input processing unit 22 · · Lubrication pipe 26 · ·

Lubrication ports

32 and 33 · · Bending portion 37 · · First air plug 38 · · Second air plug 39 · · Connection pipe 40 · · Press member 41 ・・ Gap

Claims

An internal inspection unit that detects defects inside the piping;
A piping defect detection unit that detects oil leakage from a defect detected by the internal inspection unit;
The piping defect detection unit includes a first air plug, a second air plug connected to the first air plug via a flexible connecting member, the first air plug, and a second air plug. An air pressure supply means for supplying air to the gap between the plug and the first and second air plugs;
After the first and second air plugs are inserted into the pipe in the order of the first and second air plugs, air is supplied from the air pressure supply means to the first air plug and pressed against the pipe. Thereafter, an air plug moving means for pulling back the first air plug, and after the first air plug is pulled back by the air plug moving means, from the air pressure supply means to the first air plug and the gap. Detecting means for supplying air, pressing the first air plug against the pipe, and detecting a pressure drop in the gap;
A defect detection apparatus comprising:
The internal inspection unit includes a video scope, a processing unit that processes a captured image captured by the video scope, a monitor that displays the captured image, and a recording unit that records the captured image. The defect detection apparatus according to claim 1.
3. The defect detection apparatus according to claim 1, wherein the connecting member has a predetermined length.
A defect inspection method in a defect detection apparatus comprising an internal inspection unit for detecting defects inside a pipe and a pipe defect detection unit for detecting oil leakage of the defects detected by the internal inspection unit,
The piping defect detection unit includes a first air plug, a second air plug connected to the first air plug via a flexible connecting member, the first air plug, and a second air plug. An air pressure supply means for supplying air to the gap between the plug and the first and second air plugs;
After the first and second air plugs are inserted into the pipe in the order of the first and second air plugs, air is supplied from the air pressure supply means to the first air plug and pressed against the pipe. And an air plug moving means for pulling back the first air plug.
After the first air plug is pulled back by the air plug moving means, air is supplied from the air pressure supply means to the first air plug and the gap, and the first air plug is pressed against the pipe. And detecting a pressure drop in the gap.
5. The defect detection method according to claim 4, wherein the connecting member has a predetermined length.