JPS61133857A - Method and apparatus for diagnosing corrosion of underground pipeline - Google Patents

Method and apparatus for diagnosing corrosion of underground pipeline

Info

Publication number
JPS61133857A
JPS61133857A JP59256690A JP25669084A JPS61133857A JP S61133857 A JPS61133857 A JP S61133857A JP 59256690 A JP59256690 A JP 59256690A JP 25669084 A JP25669084 A JP 25669084A JP S61133857 A JPS61133857 A JP S61133857A
Authority
JP
Japan
Prior art keywords
electromagnetic ultrasonic
ultrasonic sensor
receiver
conduit
transmitter
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
Application number
JP59256690A
Other languages
Japanese (ja)
Inventor
Katsuhiko Honjo
克彦 本庄
Keiichi Sudo
佳一 須藤
Fujio Hirabayashi
平林　富士夫
Junichi Masuda
順一 増田
Kishio Arita
紀史雄 有田
Yoshitaka Koide
小出　美孝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP59256690A priority Critical patent/JPS61133857A/en
Publication of JPS61133857A publication Critical patent/JPS61133857A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness

Abstract

PURPOSE:To improve the inspection speed and inspection operability, by diagnosing the corrosion of an underground buried pipeline noncontact using an electromagnetic ultrasonic wave. CONSTITUTION:A rotary unit 2 and a driver 3 are self-driven by the driver 3 and moves through a pipeline 7 to be set at a measuring point. An electromagnetic ultrasonic sensor 11 is started with a transmitter/receiver 4a to excite an incident wave 14 and a bottom surface echo 12 or a defect echo 13 are received. The echo signal thus obtained is converted into an electrical signal and sent to an arithmetic unit 4 through the transmitter/receiver 4a to calculate thickness at the measuring point from the difference in the reception time. Likewise, this apparatus is moved from measuring point to determine the thickness at various measuring points by repeating measurement and the minimum thickness and the position thereof are found out. A display/recorder 5 connects thickness values at various measuring points to calculate the corroded part 27 and the area thereof by 2-D plotting and displays and records the results.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、電！１超音波厚さ測定を用いて地下埋設管路
の腐食を診断する方法及びその装置に関する。[Detailed Description of the Invention] (Industrial Field of Application) The present invention is an electric! 1. A method and apparatus for diagnosing corrosion of underground pipelines using ultrasonic thickness measurement.

〔従来の技術） 従来、この種の地下管路の腐食を診断する方法あるいは
装置には、第１０図に示すような超音波法が広く用いら
れている。第１１図は、この原理を示すもので、超音波
センサ１を構成する超音波探触子内の圧電素子８によっ
て電気信号を超音波信号に変換し、これを、カップリン
グ剤１ａを介して管路７の内壁へ入射させる。そして、
管路７の内周面（入射面）と外周面（反射面）とから反
射してくる超音波を圧電素子８によって電気信号に戻し
、これらの時間差から管路７の肉厚を求めていた。なお
、第１０図、第１１図中、２は超音波センサ１を管路７
の周方向に回転する回転装置、３は超音波センサ１と回
転装置２とを管路７の長手方向に一体に移動させる駆動
装置、４は管路７の肉厚を計算する演算装置、５は演算
結果を表示記録する表示・記録装置、６は駆動装置３等
の電源、９は圧電素子８用の外部電圧源、１０は超音波
の伝播方向を示すものである。[Prior Art] Conventionally, an ultrasonic method as shown in FIG. 10 has been widely used as a method or apparatus for diagnosing corrosion of underground pipes of this type. FIG. 11 shows this principle, in which an electrical signal is converted into an ultrasonic signal by the piezoelectric element 8 in the ultrasonic probe constituting the ultrasonic sensor 1, and this is transmitted via the coupling agent 1a. The light is made incident on the inner wall of the conduit 7. and,
The ultrasonic waves reflected from the inner circumferential surface (incident surface) and outer circumferential surface (reflection surface) of the conduit 7 are converted back into electrical signals by the piezoelectric element 8, and the wall thickness of the conduit 7 is determined from the time difference between them. . In addition, in FIGS. 10 and 11, 2 indicates that the ultrasonic sensor 1 is connected to the conduit 7.
3 is a drive device that moves the ultrasonic sensor 1 and the rotation device 2 together in the longitudinal direction of the pipe 7; 4 is a calculation device that calculates the wall thickness of the pipe 7; 5 is a rotating device that rotates in the circumferential direction; 1 is a display/recording device for displaying and recording calculation results, 6 is a power source for the driving device 3, etc., 9 is an external voltage source for the piezoelectric element 8, and 10 indicates the propagation direction of the ultrasonic wave.

〔発明が解決しようとする問題点） ところで、１達した従来の測定においては、超音波セン
サ１を管路７の内周面に接触させるだめの時間が必要な
土に、接触状態が管路面あるいは測定機構・精度に大き
く影響を及ぼし、非接触で測定する方法に比べてかなり
測定操作性が劣る欠点があった。[Problems to be Solved by the Invention] By the way, in the conventional measurement when the ultrasonic sensor 1 is brought into contact with the inner circumferential surface of the pipe line 7, it is necessary to contact the soil with the inner peripheral surface of the pipe line 7. Another drawback is that it greatly affects the measurement mechanism and accuracy, and is significantly inferior in operability compared to non-contact measurement methods.

〔問題点を解決するための手段］ 上記の欠点を克服するためにこの発明は、電磁超音波を
用いることにより、非接触で地下埋設管路の腐食を診断
することを特徴とし、これによって、地下埋設管路の検
査スピードと検査操作性の向上を実現させることを目的
とする。[Means for Solving the Problems] In order to overcome the above-mentioned drawbacks, the present invention is characterized in that corrosion of underground pipes is diagnosed in a non-contact manner by using electromagnetic ultrasound, and thereby, The purpose is to improve the inspection speed and operability of underground pipelines.

〔作用］ ここで、電磁超音波による１ＩＩ１１定原理を簡単に説
明する。第２図は、この原理を示したものである。[Operation] Here, the 1II11 constant principle based on electromagnetic ultrasonic waves will be briefly explained. FIG. 2 illustrates this principle.

この図において、１５は直流磁界を発生させる励磁コイ
ル、１６は電磁超音波の発生・検出コイル、１７は直流
磁界、１８は発生・検出コイル１６によって発生する渦
電流、１９は渦電流１８と直流磁界１７によって生じる
ローレンツ力、２０は管路７と電磁超音波センサ１１と
の間のギャップである。まず、励磁コイル１５によって
管路７の内周表面に直流磁界１７を印加し、前記表面に
渦電流１８を発生させる。この渦電流１８と直流磁界１
７とにより、これらに直角な方向にローレンツ力１９が
動いて、管路表面上に渦電流１８の周波数と同じサクシ
で超音波が発生する。発生した超音波は伝播ルート１０
をたどって管路７の外周面で反射し、この反射した超音
波が、上記の過程を全く逆にした過程で検知される。In this figure, 15 is an excitation coil that generates a DC magnetic field, 16 is an electromagnetic ultrasound generation/detection coil, 17 is a DC magnetic field, 18 is an eddy current generated by the generation/detection coil 16, and 19 is an eddy current 18 and a DC The Lorentz force caused by the magnetic field 17, 20 is the gap between the conduit 7 and the electromagnetic ultrasonic sensor 11. First, a DC magnetic field 17 is applied to the inner circumferential surface of the conduit 7 by the excitation coil 15 to generate an eddy current 18 on the surface. This eddy current 18 and the DC magnetic field 1
7, the Lorentz force 19 moves in a direction perpendicular to these, and ultrasonic waves are generated on the pipe surface at the same frequency as the eddy current 18. The generated ultrasonic wave propagation route 10
This reflected ultrasonic wave is detected in a process that is the complete reversal of the above process.

第３図は、この原理による管路７の肉厚の測定方法を示
す図である。この図において、電磁超音波センサ１１よ
り送信された超音波入射波１４は、管路７の外壁健全部
で反射されて底面エコー１２となる一方、腐食部で反射
されて欠陥エコー１３となる。これらのエコー１２．１
３は電磁超音波センサ１１によって検知され、このとき
の管路７の残肉厚さＴｄは、入射波１４とエコー１３と
の伝播時間差Δｔから、音速度■を用いて、Ｔｄ＝１／
２・■・Δｔ　　　　　（１）で与えられる。本発明は
以上説明した原理に塁づ゛いて地下管路の腐食状態を非
接触で測定するものである。FIG. 3 is a diagram showing a method for measuring the wall thickness of the conduit 7 based on this principle. In this figure, an incident ultrasonic wave 14 transmitted from an electromagnetic ultrasonic sensor 11 is reflected by a healthy part of the outer wall of the conduit 7 and becomes a bottom echo 12, while it is reflected by a corroded part and becomes a defective echo 13. These echoes 12.1
3 is detected by the electromagnetic ultrasonic sensor 11, and the remaining wall thickness Td of the pipe line 7 at this time is calculated from the propagation time difference Δt between the incident wave 14 and the echo 13, using the sound velocity ■, Td=1/
It is given by 2・■・Δt (1). The present invention is based on the principle explained above to measure the corrosion state of underground pipes in a non-contact manner.

（実施例） 以下、図面を参照して本発明の詳細な説明する。第１図
は、本発明の一実施例の構成を示すブロック図である。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

この図において、２は、電磁超音波センサ１１を管路７
の円周方向に回転させる回転装置であり、ステップモー
タ等によって動作するものである。前記電磁超音波セン
サ１１および回転装置２は駆動装置３によって管路７の
長手方向に一体に移動されるようになっている。ここで
電磁超音波センサ１１は、第４図に示すように、励磁コ
イル１５と発生・検出コイル１６とコア２１とを有して
なり、すでに説明した！ｖＩ乍によって、非接触で管路
７に超音波を発生させろく第２図参照）。また、駆動装
置３は、第５図に示すように、駆動モータ２２と、タイ
ヤ２３と、回転装置３および電磁超音波センサ１１を保
持する保持バネ２４とを有し、管路７の長手方向に移動
する。In this figure, 2 indicates that the electromagnetic ultrasonic sensor 11 is connected to the conduit 7.
This is a rotating device that rotates the motor in the circumferential direction, and is operated by a step motor or the like. The electromagnetic ultrasonic sensor 11 and the rotation device 2 are moved together in the longitudinal direction of the conduit 7 by a drive device 3. Here, the electromagnetic ultrasonic sensor 11 has an excitation coil 15, a generation/detection coil 16, and a core 21, as shown in FIG. 4, and has already been described! (See Figure 2) to generate ultrasonic waves in the conduit 7 without contact. Further, as shown in FIG. 5, the drive device 3 includes a drive motor 22, a tire 23, and a holding spring 24 that holds the rotation device 3 and the electromagnetic ultrasonic sensor 11. Move to.

再び第１図に戻り、４ａは、′Ｒ磁超超音波センサ１１
送信パルスを送る一方、底面エコー１２および欠陥エコ
ー１３（第３図）に対応する電気パルスを受信する送受
信装置であり、この出力は演惇装＠４へ供給される。演
算装置４は、電磁超音波センサ１１から発信または受信
される電気信号をコントロールする制御部と、各エコー
の受信時間差△ｔｎを検出する検知部と、受信時間差Δ
ｔｎから測定位置の肉厚Ｔｄｎを計算する演算部とから
なる。そして、演算結果は、表示・記録装置５へ供給さ
れ、ここで、最小肉厚が求められ、第６図に示すように
２次元表示される。この図において、（ａ）は管路７の
円周方向に走査したときの表示であり、管路７の横断面
を２次元表示し、〈ｂ＋は管路７の長手方向に走査した
ときの表示であり、管路７の縦断面を２次元表示するよ
うになっている。、なお、記録部には上記各データが数
値的に記録される。Returning to FIG. 1 again, 4a is the 'R magnetic ultrasonic sensor 11
It is a transceiver device that sends out transmit pulses while receiving electrical pulses corresponding to the bottom echo 12 and the defect echo 13 (FIG. 3), the output of which is supplied to the station @4. The arithmetic unit 4 includes a control unit that controls the electrical signals transmitted or received from the electromagnetic ultrasonic sensor 11, a detection unit that detects the reception time difference Δtn of each echo, and a detection unit that detects the reception time difference Δtn of each echo.
and an arithmetic unit that calculates the wall thickness Tdn at the measurement position from tn. The calculation result is then supplied to the display/recording device 5, where the minimum wall thickness is determined and displayed two-dimensionally as shown in FIG. In this figure, (a) is a display when scanning the pipe line 7 in the circumferential direction, a two-dimensional display of the cross section of the pipe line 7, and <b+ is a display when scanning the pipe line 7 in the longitudinal direction. This is a two-dimensional display of a vertical cross section of the conduit 7. Note that each of the above data is numerically recorded in the recording section.

次に、第７図〜第９図を参照して本実施例の動作を説明
する。Next, the operation of this embodiment will be explained with reference to FIGS. 7 to 9.

第７図は、管路７の長手方向の走査例を示すものであり
、回転装置２および駆動装置３は、駆動装置３によって
自走するか、けん引蓋２５に巻回されたローブ２６によ
ってけん引されて信士し、管路７の長手方向に測定間隔
△Ｌで移動し、測定点ｎ　（ｎ＝１．２・・・）にセッ
トされる。（第９図（工））。FIG. 7 shows an example of scanning in the longitudinal direction of the conduit 7, in which the rotating device 2 and the driving device 3 are either self-propelled by the driving device 3 or towed by the lobe 26 wound around the towing lid 25. It moves in the longitudinal direction of the conduit 7 at a measurement interval ΔL, and is set at a measurement point n (n=1.2...). (Figure 9 (engineering)).

こうして、測定点ｎが定まると、電磁超音波センサ１１
が送受信装置４ａによって起動されて第３図に示す入射
波１４が励起され、底面エコー１２または欠陥エコー１
３が受信される。こうして得られたエコー信号は電気信
号に変換され、送受信装置４ａを介して演譚信＠４に送
られ、受信時間差Δｔｎから測定点ｎでの肉厚Ｔｄｎが
計算される（第９図（ＩＩ）　　（ＩＩＩ））。In this way, when the measurement point n is determined, the electromagnetic ultrasonic sensor 11
is activated by the transmitting/receiving device 4a to excite the incident wave 14 shown in FIG.
3 is received. The echo signal obtained in this way is converted into an electrical signal and sent to the transmission @ 4 via the transmitting/receiving device 4a, and the wall thickness Tdn at the measurement point n is calculated from the reception time difference Δtn (Fig. 9 (II) ) (III)).

以下、同様に、測定点ｎを１つずつ移動して上記測定を
繰り返し、各測定点ｎでの肉厚Ｔｄｎを求めて、その中
での最小肉厚ｍｉｎ　Ｔｄ　（Ｘ、　Ｖ）とその位置（
ｘ、ｙ）を求める（第９図（■））。Similarly, the measurement points n are moved one by one and the above measurements are repeated to find the wall thickness Tdn at each measurement point n, and the minimum wall thickness min Td (X, V) and its position are calculated. (
x, y) (Figure 9 (■)).

ざらに、表示・記録装置５は各測定点ｎでの肉厚Ｔｄｎ
を直線で結んで２次元プロットし、第７図に示す腐食部
２７とその面積Ｓとを計算して、これらを記憶するとと
もに、上記各データを第６図（ｂ＋に示すように表示記
録する（第９図（ＩＶ））。Roughly speaking, the display/recording device 5 displays the wall thickness Tdn at each measurement point n.
are connected with straight lines and plotted two-dimensionally, and the corroded part 27 and its area S shown in Fig. 7 are calculated and memorized, and each of the above data is displayed and recorded as shown in Fig. 6 (b+) (Figure 9 (IV)).

次に、第８図は円周方向の走査例を示すものである。こ
の場合、Ｎ超超音波センサ１１は回転装置２によって管
路７の円周方向に回転され、各測定点ｎ毎に上と同様に
して肉厚Ｔｄｎが測定される。また、腐食面積Ｓ、Ｒ小
肉厚ｍ１ｎＴｄ（ｒ。Next, FIG. 8 shows an example of scanning in the circumferential direction. In this case, the N ultrasonic sensor 11 is rotated by the rotating device 2 in the circumferential direction of the conduit 7, and the wall thickness Tdn is measured at each measurement point n in the same manner as above. In addition, corrosion area S, R small wall thickness m1nTd(r.

θ）とその位置（ｒ、θ）を求め、第６図（ωに示すよ
うに表示記録する。θ) and its position (r, θ) are determined and displayed and recorded as shown in FIG. 6 (ω).

これらの動作によって地下管路の腐食した肉厚を管路の
内壁から自動的に検知し、その＠食面積と腐食、による
最小肉厚を非接触で測定し、しかもその測定断面を２次
元的に再現できる。Through these operations, the corroded wall thickness of underground pipes is automatically detected from the inner wall of the pipe, the corrosion area and the minimum wall thickness due to corrosion are measured without contact, and the measurement cross section is two-dimensionally measured. can be reproduced.

なお、以上の動作の組合わせることによって、電ｒ！１
超音波センサを管内で螺施状に走査させることも可能で
ある。Note that by combining the above operations, electric r! 1
It is also possible to scan the ultrasonic sensor in a spiral manner within the tube.

〔発明の効果） 以上説明したように、本発明は、地下管路の腐食による
肉厚の測定に電磁超音波センサを応用し、自動的にしか
も非接触で管路の腐食面積、位置、最小肉厚を測定する
ものであるから、従来の方法あるいは装置より、検査ス
ピードが速く、操作性に優れるという利点が得られる。[Effects of the Invention] As explained above, the present invention applies an electromagnetic ultrasonic sensor to measure the wall thickness due to corrosion of underground pipes, and automatically and non-contactly measures the corroded area, position, and minimum of the pipes. Since this method measures wall thickness, it has the advantage of faster inspection speed and superior operability than conventional methods or devices.

このため、金属材料構造物の厚さ、寸法の測定、オンラ
インで製造される鋼板、配管、薄板の品質検査、水、液
体等の接触をきらう製品・構造物の厚さ測定、メッキ、
塗膜を施した製品・構造物の基板材料の厚さ測定を、製
品・構造物を動かすことなしに自動的に検査・診断でき
る利点がある。For this reason, we measure the thickness and dimensions of metal material structures, inspect the quality of steel plates, piping, and thin plates manufactured online, measure the thickness of products and structures that do not want contact with water, liquids, etc., plate,
This method has the advantage of automatically inspecting and diagnosing the thickness of the substrate material of coated products and structures without moving the product or structure.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本発明の一実施例による地下管路腐食診断装
置の構成を示すブロック図、第２図は電磁超音波法の原
理図、第３図〈Ｊは電磁超音波厚さ測定の方法を示す図
、同図中）はエコーパルスと時間との関係を示す図、第
４図は電磁超音波センサ１１の構成を示す概略図、第５
図は駆動装置３の構成を示す概略図、第６図は表示・記
録装置の表示状態を示す図で、同図（ａｌは管路断面表
示、（ｂ＋は長手断面表示、第７図は管路長手方向の診
断走査を説明するための部分断面図、第８図は管路円周
方向の診断走査を説明するための図、第９図は上記実施
例の測定ブロック図、第１０図は従来の地下管路腐食診
断装置の構成を示す概略図、第１１図は従来の超音波厚
さ測定方法を説明するための概略図である。 ２・・・・・・回転装置、３・・・・・・駆動装置、４
・・・・・・演算装置、４ａ・・・・・・送受信装置、
５・・・・・・表示・記録装置、７・・・・・・管路、
１１・・・・・・電磁超音波センサ、ｎ・・・・・・測
定点。 【 第３ 図 図 と　　龍 第４図 第５図 第６図 （Ｑ） （ｂ） 第７図 ２７；、著裏）Ｐ 第８図Fig. 1 is a block diagram showing the configuration of an underground pipe corrosion diagnosis system according to an embodiment of the present invention, Fig. 2 is a principle diagram of the electromagnetic ultrasonic method, and Fig. 3 (J is the electromagnetic ultrasonic thickness measurement method). Figure 4 is a diagram showing the relationship between echo pulses and time; Figure 4 is a schematic diagram showing the configuration of the electromagnetic ultrasonic sensor 11;
The figure is a schematic diagram showing the configuration of the drive device 3, and FIG. 6 is a diagram showing the display state of the display/recording device. FIG. 8 is a partial sectional view for explaining diagnostic scanning in the longitudinal direction of the pipe, FIG. 9 is a diagram for explaining diagnostic scanning in the circumferential direction of the pipe, FIG. 9 is a measurement block diagram of the above embodiment, and FIG. A schematic diagram showing the configuration of a conventional underground pipe corrosion diagnosis device, and FIG. 11 is a schematic diagram for explaining a conventional ultrasonic thickness measurement method. 2...Rotating device, 3... ... Drive device, 4
... Arithmetic device, 4a... Transmission/reception device,
5...Display/recording device, 7...Pipeline,
11... Electromagnetic ultrasonic sensor, n... Measurement point. [ Fig. 3 and Dragon Fig. 4 Fig. 5 Fig. 6 (Q) (b) Fig. 7 27;, back of the book) P Fig. 8

Claims (2)

【特許請求の範囲】[Claims] （１）地下管路の内壁面を非接触で走査する電磁超音波
センサより得られた管路肉厚を前記管路の各位置に対し
て集計・演算し、この演算結果を前記管路の各位置に対
して表示・記録することを特徴とする地下管路腐食診断
方法。(1) The pipe wall thickness obtained by an electromagnetic ultrasonic sensor that non-contact scans the inner wall surface of the underground pipe is aggregated and calculated for each position of the pipe, and this calculation result is used for the An underground pipe corrosion diagnosis method characterized by displaying and recording information for each location. （２）地下管路の内壁に対して非接触で配置された電磁
超音波発信・受信子を有する電磁超音波センサと、この
電磁超音波センサを前記管路の円周方向に回転させる回
転装置と、前記電磁超音波センサおよび回転装置を、前
記管路の内壁面長手方向に一体に移動させる駆動装置と
、前記電磁超音波センサと電気的に接続された送受信装
置と、この送受信装置の入出力信号に基づいて前記管路
の各測定位置における肉厚を計算する演算装置と、この
演算結果を表示・記録する表示・記録装置とを具備する
ことを特徴とする地下管路腐食診断装置。(2) An electromagnetic ultrasonic sensor having an electromagnetic ultrasonic transmitter/receiver placed in a non-contact manner on the inner wall of the underground conduit, and a rotation device that rotates this electromagnetic ultrasonic sensor in the circumferential direction of the conduit. a drive device that integrally moves the electromagnetic ultrasonic sensor and the rotation device in the longitudinal direction of the inner wall surface of the conduit; a transmitter/receiver electrically connected to the electromagnetic ultrasonic sensor; and an input/receiver for the transmitter/receiver. An underground pipe corrosion diagnostic apparatus comprising: a calculation device that calculates the wall thickness at each measurement position of the pipe based on an output signal; and a display/recording device that displays and records the calculation results.
JP59256690A 1984-12-05 1984-12-05 Method and apparatus for diagnosing corrosion of underground pipeline Pending JPS61133857A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59256690A JPS61133857A (en) 1984-12-05 1984-12-05 Method and apparatus for diagnosing corrosion of underground pipeline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59256690A JPS61133857A (en) 1984-12-05 1984-12-05 Method and apparatus for diagnosing corrosion of underground pipeline

Publications (1)

Publication Number Publication Date
JPS61133857A true JPS61133857A (en) 1986-06-21

Family

ID=17296119

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59256690A Pending JPS61133857A (en) 1984-12-05 1984-12-05 Method and apparatus for diagnosing corrosion of underground pipeline

Country Status (1)

Country Link
JP (1) JPS61133857A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003014704A (en) * 2001-07-02 2003-01-15 Nkk Corp Corrosion inspection method
JP2003021621A (en) * 2001-07-09 2003-01-24 Nkk Corp Corrosion diagnosing system
JP2006220569A (en) * 2005-02-10 2006-08-24 Tokimec Inc Corrosion detector of bottom part of rail, and method for detecting corrosion of the bottom part of rail
CN105229460A (en) * 2013-02-28 2016-01-06 阿海珐有限公司 Detect about the main body of metal wall thickness, the method for time dependent thermal and mechanical stress and/or stress gradient
JP6768990B1 (en) * 2019-02-21 2020-10-14 株式会社テイエルブイ probe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5476282A (en) * 1977-11-30 1979-06-18 Nitto Eng Service Method of detecting flaw and thickness of of pipe by ultrasonic waves
JPS58132657A (en) * 1982-02-02 1983-08-08 Mitsubishi Heavy Ind Ltd Electromagnetic ultrasonic flaw detector for slender pipe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5476282A (en) * 1977-11-30 1979-06-18 Nitto Eng Service Method of detecting flaw and thickness of of pipe by ultrasonic waves
JPS58132657A (en) * 1982-02-02 1983-08-08 Mitsubishi Heavy Ind Ltd Electromagnetic ultrasonic flaw detector for slender pipe

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003014704A (en) * 2001-07-02 2003-01-15 Nkk Corp Corrosion inspection method
JP2003021621A (en) * 2001-07-09 2003-01-24 Nkk Corp Corrosion diagnosing system
JP2006220569A (en) * 2005-02-10 2006-08-24 Tokimec Inc Corrosion detector of bottom part of rail, and method for detecting corrosion of the bottom part of rail
JP4718857B2 (en) * 2005-02-10 2011-07-06 東京計器株式会社 Rail bottom corrosion detection device and rail bottom corrosion detection method
CN105229460A (en) * 2013-02-28 2016-01-06 阿海珐有限公司 Detect about the main body of metal wall thickness, the method for time dependent thermal and mechanical stress and/or stress gradient
JP6768990B1 (en) * 2019-02-21 2020-10-14 株式会社テイエルブイ probe

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