JPH04184133A - Detection of pinhole on pipe body - Google Patents
Detection of pinhole on pipe bodyInfo
- Publication number
- JPH04184133A JPH04184133A JP31330090A JP31330090A JPH04184133A JP H04184133 A JPH04184133 A JP H04184133A JP 31330090 A JP31330090 A JP 31330090A JP 31330090 A JP31330090 A JP 31330090A JP H04184133 A JPH04184133 A JP H04184133A
- Authority
- JP
- Japan
- Prior art keywords
- pinhole
- sound wave
- tubular body
- sound
- wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、銅管等の管状体中のピンホールの有無及び位
置を検出する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting the presence and location of pinholes in a tubular body such as a copper pipe.
［従来の技術及びその問題点］
鋼管、アルミニウム管等の金属管や塩化ビニル管等の管
状体が損傷している場合、特に管状体を貫通するような
孔が存在している場合は、該欠陥部位から水等が侵入し
易くなったり漏洩し易くなり管状体の劣化を促進きせる
。また、ＯＦケーブルのアルミシース等に貫通孔が存在
すると、ケーブルコア内に水が侵入し絶縁破壊を起こす
原因となる。このような欠陥部位が大きなものであれば
目視にて確認できなくもないが、微小なピンホールの場
合はその検出が極めて困難である。[Prior art and its problems] If a tubular body such as a metal pipe such as a steel pipe or aluminum pipe or a vinyl chloride pipe is damaged, especially if there is a hole penetrating the tubular body, Water or the like becomes more likely to enter or leak from the defective site, accelerating deterioration of the tubular body. Further, if a through hole exists in the aluminum sheath of the OF cable, water may enter the cable core and cause dielectric breakdown. If such a defect site is large, it can be visually confirmed, but if it is a minute pinhole, it is extremely difficult to detect it.
従来、管状体のピンホール検出方法としては、管状体試
料内に加圧気体を充填し、該試料を水中に浸漬して発泡
を観察する方法がある。この方法はピンホールの有無及
び位置を一目で知見できるが、長尺の管状体に適用し難
い欠点がある。Conventionally, as a method for detecting pinholes in a tubular body, there is a method in which a pressurized gas is filled into a tubular body sample, the sample is immersed in water, and bubbling is observed. Although this method allows the presence and location of pinholes to be known at a glance, it has the disadvantage that it is difficult to apply to long tubular bodies.
また、管状体内に一定圧力の気体を充填し、その圧力変
化を監視する方法もある。この方法は長尺管状体にも適
用可能であり、加圧気体の圧力減少をチエツクするのみ
で比較的容易にピンホールの有無を知見できるが、ピン
ホールの存在位置まで検出することはできない。Another method is to fill the tubular body with gas at a constant pressure and monitor changes in the pressure. This method can also be applied to long tubular bodies, and the presence or absence of pinholes can be detected relatively easily simply by checking the decrease in pressure of pressurized gas, but it is not possible to detect the location of pinholes.
従って本発明は、管状体、特に長尺の管状体のとンホー
ルの有無及び位置を容易に知見し得る方法を提供するこ
とを目的とする。Therefore, an object of the present invention is to provide a method by which the presence or absence and position of a hole in a tubular body, particularly a long tubular body, can be easily determined.
［課題を解決するための手段］
本発明の管状体のピンホール検出方法は、管状体の周上
に、ピンホールを検出すべき区間の間隔をあけて２ポイ
ントに音波検出センサをそれぞれ設置しておき、前記管
状体内に加圧気体を充填し、該気体が外被のピンホール
から漏洩した場合に発生する漏洩前が、管状体を伝搬し
て前記２ポイントに達した時の音波を前記各音波検出セ
ンサでそれぞれ検出すると共に、各音波検出センサの検
出音波波形を対比することにより、管状体中のピンホー
ルの有無及び位置を知見することを特徴とするものであ
る。[Means for Solving the Problems] The method for detecting pinholes in a tubular body of the present invention includes installing sound wave detection sensors at two points on the circumference of the tubular body with an interval between sections where pinholes are to be detected. The tubular body is filled with pressurized gas, and the sound wave generated when the gas leaks from a pinhole in the outer jacket propagates through the tubular body and reaches the two points described above. The present invention is characterized in that the presence or absence and position of a pinhole in the tubular body can be determined by detecting it with each sound wave detection sensor and comparing the detected sound wave waveforms of each sound wave detection sensor.
［作用］
加圧気体を充填した管状体にピンホールが存在すると、
加圧気体がピンホールから漏洩し、この時に気体漏洩前
が発生する。該漏洩前はピンホール部位を起点として管
状体材料中を両方向に音波として伝搬するので、管状体
周上に設置した音波検出センサにより前記音波を検出す
ることによって、ピンホールの有無を検知することがで
きる。[Function] If a pinhole exists in a tubular body filled with pressurized gas,
Pressurized gas leaks from the pinhole, and at this time a gas pre-leak occurs. Before the leakage, sound waves propagate in both directions in the tubular body material starting from the pinhole site, so the presence or absence of a pinhole can be detected by detecting the sound waves with a sound wave detection sensor installed on the circumference of the tubular body. I can do it.
また、音波は材料中を伝搬すると定数的に減衰するので
、管状体の２ポイントでそれぞれ音波検出センサで検出
した音波を対比することにより、その波形の大きざの比
率からピンホールの位置を算出することができる。In addition, since sound waves are attenuated constant as they propagate through the material, by comparing the sound waves detected by sound wave detection sensors at two points on the tubular body, the position of the pinhole can be calculated from the ratio of the waveform sizes. can do.
［実施例］
以下図面に基づいて本発明の一実施例を詳細に説明する
。[Example] An example of the present invention will be described in detail below based on the drawings.
第１図は本発明にかかる検出方法を示す模式的な断面図
である。図において、１は管状体であり、各種金属管や
ゴム・プラスチック管、あるいは電気ケーブルの外被等
のいずれであっても良い。このような管状体１の両端部
局上には、音波検出センサ２１．２２がそれぞれ設けら
れている。FIG. 1 is a schematic cross-sectional view showing the detection method according to the present invention. In the figure, 1 is a tubular body, which may be any of various metal tubes, rubber/plastic tubes, or the outer jacket of an electric cable. Sonic detection sensors 21 and 22 are provided on both ends of the tubular body 1, respectively.
音波検出センサ２１，２２としては各種マイクロフォン
を使用することができるが、本発明においては管状体１
中の伝搬音をキャッチする必要があるので、動電形リボ
ンマイクロフォン等の指向性を有するものを使用し、指
向面を管状体１表面側に当接させることが伝搬音を効率
良くキャッチするために望ましい。音波検出センサ２１
，２２は本実施例のように必ずしも管状体１０両端部に
設置せずとも、管状体１のピンホールを検出すべき任意
の区間の間隔をあけて２ポイントに設置すれば良い。そ
して音波検出センサ２１．２２には、それぞれがキャッ
チした音波を表示する音波表示装置３１．３２を接碕し
ている。Various types of microphones can be used as the sound wave detection sensors 21 and 22, but in the present invention, the tubular body 1
Since it is necessary to catch the propagating sound inside, it is necessary to use a device with directional properties such as an electrodynamic ribbon microphone, and to bring the directional surface into contact with the surface side of the tubular body 1, in order to efficiently catch the propagating sound. desirable. Sound wave detection sensor 21
, 22 are not necessarily installed at both ends of the tubular body 10 as in this embodiment, but may be installed at two points at an interval of an arbitrary section in which a pinhole in the tubular body 1 is to be detected. Each of the sound wave detection sensors 21 and 22 is connected to a sound wave display device 31 and 32 that displays the sound wave that each sensor catches.
上記のように準備を行い、先ず管状体１の両端部を栓体
１２，１３により閉塞して管状体１内部を気密状態とし
ておく。次いで栓体１２に穿孔した注入口よりエアーポ
ンプ４等を用いて、例えば空気、窒素等の気体を送出し
、管状体ｌ内部を加圧気体が充填された状態とする。Preparations are made as described above, and first, both ends of the tubular body 1 are closed with plugs 12 and 13 to make the inside of the tubular body 1 airtight. Then, using an air pump 4 or the like, a gas such as air or nitrogen is sent out from an inlet drilled in the stopper 12, so that the inside of the tubular body 1 is filled with pressurized gas.
ここで、管状体１にピンホール１１が存在している場合
、内部の加圧気体は該ビンネール１１から漏洩するが、
この時機小孔から加圧流体がリークする場合に生ずるよ
うな漏洩前がピンホール１１存在部位から発生する。該
漏洩前は、ピンホール１１部位を起点として管状体１中
をその両端部に向けて伝搬する。そしてこの伝搬音が管
状体１の両端部に達した時、すなわち音波検出センサ２
１．２２を設置した２ポイントに達した時、音波として
各音波検出センサ２１．２２にてそれぞれ検出きれる。Here, if a pinhole 11 exists in the tubular body 1, the pressurized gas inside will leak from the pinhole 11, but
At this time, a pre-leakage occurs from the location where the pinhole 11 exists, as would occur if the pressurized fluid leaked from the small hole. Before the leakage, the leakage propagates through the tubular body 1 toward both ends thereof, starting from the pinhole 11 portion. When this propagated sound reaches both ends of the tubular body 1, that is, the sound wave detection sensor 2
1.22, each of the sound wave detection sensors 21 and 22 can detect the sound wave as a sound wave.
ここで、検出した音波を音波表示装置３１．３２でそれ
ぞれ表示させるようにすれば、検出音波波形の対比を行
うことができる。Here, if the detected sound waves are displayed on the sound wave display devices 31 and 32, the detected sound wave waveforms can be compared.
ところで、媒質内を音波が伝搬する場合、音波エネルギ
ーは波の進行と共にその一部が媒質の中に吸収され音波
吸収減衰が起きる。この吸収減衰率は同一媒質材料では
一定であり、従って音波検出センサ２１．２２の検出音
波波形を対比することにより、その波高値の比率等から
ピンホール１１の位置を算出することができる。例えば
、音波検出センサ３１．３２の表示波形の波高値が同一
であれば、ピンホール１１は音波検出センサ２１゜２２
の設置位置の中間点に位置することになり、表示装置３
１１１１０波高値が十分大であれば、音波検出センサ２
１側近くにピンホール１１が存在するという具合に、音
波の減衰度合の比率から、音波検出センサ２１．２２を
設置した区間を比率化して算出することによりピンホー
ル１１の位置を検出することができる。By the way, when a sound wave propagates within a medium, a portion of the sound wave energy is absorbed into the medium as the wave advances, causing sound wave absorption and attenuation. This absorption/attenuation rate is constant for the same medium material, so by comparing the waveforms of the sound waves detected by the sound wave detection sensors 21 and 22, the position of the pinhole 11 can be calculated from the ratio of their peak values. For example, if the peak values of the displayed waveforms of the sound wave detection sensors 31 and 32 are the same, the pinhole 11 is located between the sound wave detection sensors 21 and 22.
It will be located at the midpoint of the installation position of display device 3.
11110 If the wave height value is sufficiently large, the sound wave detection sensor 2
If the pinhole 11 exists near the first side, the position of the pinhole 11 can be detected by calculating the ratio of the section where the sound wave detection sensor 21, 22 is installed from the ratio of the degree of attenuation of the sound wave. can.
なお、音波の吸収減衰はその周波数によって大きく異な
るので、音波波形の対比は同一周波数で行うことが望ま
しい。このため、音波表示装置３１．３２として周波数
スペクトル分析が行い得る装置を使用し、特定周波数の
波高値をそれぞれの音波表示装置３１．３２で表示きせ
、これを対比することが好ましい。また、音波検出セン
サ２１゜２２が音波を検出しなかった場合は、管状体１
にはピンホールが無いと判断できる。Note that since the absorption and attenuation of sound waves differs greatly depending on their frequency, it is desirable to compare the sound wave waveforms at the same frequency. For this reason, it is preferable to use a device that can perform frequency spectrum analysis as the sound wave display device 31, 32, display the peak value of a specific frequency on each sound wave display device 31, 32, and compare the results. Furthermore, if the sound wave detection sensors 21 and 22 do not detect sound waves, the tubular body 1
It can be determined that there are no pinholes.
本発明は各種管状体のピンホール検出に有効であり、例
えば電カケープルの外被中のピンホールの有無及び位置
を検出することができる。この場合、ケーブルコアとケ
ーブル外被との間に空隙を有するケーブルにおいて、前
記空隙に加圧気体を充填すれば本発明は適用可能である
。The present invention is effective in detecting pinholes in various tubular bodies, and can detect the presence and position of pinholes in the outer jacket of power cables, for example. In this case, the present invention can be applied to a cable having a gap between the cable core and the cable jacket, as long as the gap is filled with pressurized gas.
［発明の効果］
以上説明した通りの本発明の管状体のピンホール検出方
法によれば、管状体の２ポイントに音波検出センサを設
置すると共に管状体内に加圧気体を充填し、先ずピンホ
ールから気体が漏れる時の漏洩音の有無によりピンホー
ルの有無を検知し、そして上記音波検出センサがキャッ
チした伝搬漏洩音波の波形の対比によりピンホールの位
置を検出する構成であるので、従来は困難であったピン
ホールの有無及び位置の検出を極めて容易に行うことが
できる。[Effects of the Invention] According to the method for detecting pinholes in a tubular body of the present invention as described above, sound wave detection sensors are installed at two points on the tubular body, and pressurized gas is filled in the tubular body, and the pinhole is detected first. The system detects the presence or absence of a pinhole based on the presence or absence of a leaking sound when gas leaks from the air, and then detects the position of the pinhole by comparing the waveforms of the propagating leakage sound waves caught by the sound wave detection sensor, which is difficult to do in the past. The presence and location of pinholes can be detected extremely easily.
また、本発明は特に大掛りな装置を必要とせず、２つの
音波検出センサが検出した音波波形を対比するのみで検
出できるので測定が簡単であり、ざらに長尺の管状体に
も容易に適用できる等、優れた効果を奏するものである
。In addition, the present invention does not require any particularly large-scale equipment, and can be detected simply by comparing the sound wave waveforms detected by two sound wave detection sensors, making measurement easy. It can be applied and has excellent effects.
第１図は本発明の一実施例を模式的に示す断面図である
。FIG. 1 is a sectional view schematically showing an embodiment of the present invention.
Claims (1)
あけて２ポイントに音波検出センサをそれぞれ設置して
おき、前記管状体内に加圧気体を充填し、該気体が外被
のピンホールから漏洩した場合に発生する漏洩音が、管
状体を伝搬して前記２ポイントに達した時の音波を前記
各音波検出センサでそれぞれ検出すると共に、各音波検
出センサの検出音波波形を対比することにより、管状体
中のピンホールの有無及び位置を知見することを特徴と
する管状体のピンホール検出方法。Sonic detection sensors are installed at two points on the circumference of the tubular body with an interval between the sections where pinholes are to be detected, and the tubular body is filled with pressurized gas, and the gas is applied to the pins of the outer sheath. Each of the sound wave detection sensors detects the sound wave when the leaked sound generated when leaking from the hole propagates through the tubular body and reaches the two points, and the waveforms of the sound wave detected by each of the sound wave detection sensors are compared. A method for detecting pinholes in a tubular body, characterized in that the presence or absence and position of pinholes in the tubular body are determined by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31330090A JPH04184133A (en) | 1990-11-19 | 1990-11-19 | Detection of pinhole on pipe body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31330090A JPH04184133A (en) | 1990-11-19 | 1990-11-19 | Detection of pinhole on pipe body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04184133A true JPH04184133A (en) | 1992-07-01 |
Family
ID=18039562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31330090A Pending JPH04184133A (en) | 1990-11-19 | 1990-11-19 | Detection of pinhole on pipe body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04184133A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009205121A (en) * | 2008-01-30 | 2009-09-10 | Ricoh Co Ltd | Image forming apparatus |
| RU2484362C1 (en) * | 2011-12-22 | 2013-06-10 | Вячеслав Васильевич Болынов | Method of defining pipeline break spots by acoustic correlation diagnostics |
| CN106556495A (en) * | 2015-09-24 | 2017-04-05 | 现代自动车株式会社 | The hole inspection method of vehicle and the system for performing the method |
| US10458878B2 (en) | 2014-06-16 | 2019-10-29 | Nec Corporation | Position determination device, leak detection system, position determination method, and computer-readable recording medium |
| WO2021009971A1 (en) * | 2019-07-12 | 2021-01-21 | 株式会社ネクスコ東日本エンジニアリング | Sealed wire rope inspection method, sealed wire repair method, and sealed wire rope |
-
1990
- 1990-11-19 JP JP31330090A patent/JPH04184133A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009205121A (en) * | 2008-01-30 | 2009-09-10 | Ricoh Co Ltd | Image forming apparatus |
| RU2484362C1 (en) * | 2011-12-22 | 2013-06-10 | Вячеслав Васильевич Болынов | Method of defining pipeline break spots by acoustic correlation diagnostics |
| US10458878B2 (en) | 2014-06-16 | 2019-10-29 | Nec Corporation | Position determination device, leak detection system, position determination method, and computer-readable recording medium |
| CN106556495A (en) * | 2015-09-24 | 2017-04-05 | 现代自动车株式会社 | The hole inspection method of vehicle and the system for performing the method |
| US9863835B2 (en) | 2015-09-24 | 2018-01-09 | Hyundai Motor Company | Hole detection method of vehicle and system performing the same |
| WO2021009971A1 (en) * | 2019-07-12 | 2021-01-21 | 株式会社ネクスコ東日本エンジニアリング | Sealed wire rope inspection method, sealed wire repair method, and sealed wire rope |
| JP2021015044A (en) * | 2019-07-12 | 2021-02-12 | 東日本高速道路株式会社 | Method for checking sealed wire rope, method for repairing sealed wire rope, and sealed wire rope |
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