JPH03160354A - Method of monitoring corrosion of tank bottom plate - Google Patents
Method of monitoring corrosion of tank bottom plateInfo
- Publication number
- JPH03160354A JPH03160354A JP1297615A JP29761589A JPH03160354A JP H03160354 A JPH03160354 A JP H03160354A JP 1297615 A JP1297615 A JP 1297615A JP 29761589 A JP29761589 A JP 29761589A JP H03160354 A JPH03160354 A JP H03160354A
- Authority
- JP
- Japan
- Prior art keywords
- bottom plate
- tank bottom
- current
- counter electrode
- corrosion
- 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
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、タンク底板の腐食監視方法に係り、特に、
交流インピーダンス測定法を利用したタンク底板の腐食
監視方法の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for monitoring corrosion of a tank bottom plate, and in particular,
This paper relates to an improvement in a corrosion monitoring method for tank bottom plates using AC impedance measurement method.
一般に、タンク底板の腐食による漏洩事故を防止するた
めに、タンクを検査することが必要である。In general, it is necessary to inspect tanks to prevent leakage accidents due to corrosion of the tank bottom plate.
従来にあっては、通常、タンクの検査は５年又は１０年
に一回の開放点検時に、タンク内側からの超音波厚み計
による肉厚測定が行われてい、る（防錆管理，６５−７
１．１９８９）。In the past, tank wall thickness was usually measured using an ultrasonic thickness gauge from the inside of the tank during an open inspection once every 5 or 10 years (Rust Prevention Management, 65- 7
1.1989).
しかしながら、この方法はタンクを完全に空にしないと
実施できないという技術課題がある。However, this method has a technical problem in that it cannot be implemented unless the tank is completely emptied.
このような技術課題を解決するために、タンク底板の腐
食状況を交流インピーダンス測定法により監視する方法
が、「防食技術Ｊ，３６．１７−２２（１９Ｂ？）に提
案されている。In order to solve such technical problems, a method of monitoring the corrosion status of the tank bottom plate by AC impedance measurement method is proposed in "Corrosion Prevention Technology J, 36.17-22 (19B?).
この方法は、タンクをその都度開放する必要がない点で
優れているが、抵抗が大きいため、複雑且つ高価な増幅
システムを必要とする。This method is advantageous in that it does not require opening the tank each time, but it requires a complex and expensive amplification system due to the high resistance.
この発明は、以上の課題を解決するためになされたもの
であって、タンクの腐食状況をタンクを開放することな
く、しかも、精度良く監視することができるタンク底板
の腐食監視方法を提供するものである。This invention has been made to solve the above problems, and provides a method for monitoring corrosion of a tank bottom plate, which can accurately monitor the corrosion status of a tank without opening the tank. It is.
すなわち、この発明に係るタンク底板の腐食監視方法は
、タンク底板の腐食状況を交流インピーダンス測定法に
より監視する方法を前提とし、タンク基礎中にタンク底
板に対向する複数の対極を埋め込み、タンク底板と上記
対極との間の交流インピーダンス測定用の周波数応答解
析装置をタンク底板及び対極に電気的に接続し、タンク
底板及び上記対極間に流れる電流のうち、上記対極に路
面した領域以外の電流路からの迷送電流を除去した状態
で電流検出を行うようにしたことを特徴とするものであ
る。That is, the method for monitoring corrosion of a tank bottom plate according to the present invention is based on the method of monitoring the corrosion status of the tank bottom plate by using an AC impedance measurement method. A frequency response analyzer for measuring AC impedance between the above counter electrode is electrically connected to the tank bottom plate and the counter electrode, and the current flowing between the tank bottom plate and the above counter electrode is connected to a current path other than the area facing the road surface to the above counter electrode. The present invention is characterized in that current detection is performed with the stray current removed.
このような技術的手段において、対象とするタンクは新
設であっても、既設であっても差し支えない。In such technical measures, the target tank may be a newly constructed tank or an existing tank.
また、タンク基礎は通常砂が用いられているが、砂に限
られるものではない。防食を目的としで、オイルサンド
、アスファルトサンドを用いたり、塗料その他の防食剤
をタンク底板に塗布したりしてもよい。Furthermore, although sand is usually used for tank foundations, it is not limited to sand. For the purpose of corrosion prevention, oil sand or asphalt sand may be used, or paint or other anticorrosion agent may be applied to the tank bottom plate.
更に、腐食箇所の同定を容易にするという観点から、タ
ンク基礎には複数の対極を埋め込んでおく。Furthermore, from the perspective of making it easier to identify corrosion locations, multiple counter electrodes are embedded in the tank foundation.
この場合、対極の材質としては導通可能なものであれば
適宜選択して差し支えないが、ガルバノ電池腐食防止の
点からすればタンク底板の材質と同じ金属であることが
好ましい。また、対極の大きさは任意であるが、寿命や
抵抗の点で１００〜１，０００ｃｉ（面積）×３〜ｌＯ
Ｍ（厚み）程度の平板状のものが好ましい。そしてまた
、対極は銅線等の導線に接続され、この導線の他端が外
部に引き出されている。更に、対極は二つであってもよ
いが、多数埋め込んだ方がより正確な情報を与える点で
好ましい。好ましい具体的態様としては、タンク底板を
３〜ｌＯ等分し、夫々の中心の真下にくる基礎中に対極
を埋め込むようにしたものが挙げられる。そして、対極
の埋め込む深さは基礎表面から５０〜１００Ｗ程度のと
ころが適当である。In this case, the material of the counter electrode may be appropriately selected as long as it is electrically conductive, but from the viewpoint of preventing corrosion of the galvano cell, it is preferably the same metal as the material of the tank bottom plate. The size of the counter electrode is arbitrary, but from the viewpoint of lifespan and resistance, it should be 100 to 1,000 ci (area) x 3 to 10
A flat plate with a thickness of about M (thickness) is preferable. Further, the counter electrode is connected to a conducting wire such as a copper wire, and the other end of this conducting wire is drawn out. Furthermore, although there may be two counter electrodes, it is preferable to embed a large number of counter electrodes in terms of providing more accurate information. A preferred specific embodiment is one in which the tank bottom plate is divided into 3 to 10 equal parts, and a counter electrode is embedded in the foundation directly below the center of each part. The appropriate depth for embedding the counter electrode is about 50 to 100 W from the foundation surface.
交流インピーダンスの測定は周波数応答解析装置にて行
う。この周波数応答解析装置は、タンク底板と対極との
間の電流、電圧情報に基づいて両者間の交流インピーダ
ンスを測定するものである。AC impedance is measured using a frequency response analyzer. This frequency response analysis device measures the alternating current impedance between the tank bottom plate and the counter electrode based on current and voltage information between the two.
この場合において、上記対極は複数埋め込まれているた
め、タンク底板と各対極との間の交流インピーダンスを
順次測定できるように、例えば、切り換え手段にて各対
極を順次切り換え選択するように設計することがよい。In this case, since a plurality of counter electrodes are embedded, the design should be such that, for example, each counter electrode is sequentially switched and selected by a switching means so that the AC impedance between the tank bottom plate and each counter electrode can be sequentially measured. Good.
また、上記タンク底板と対極との間、の電流検出方式と
しては、少なくとも、タンク底板と対極との間に生ずる
迷送電流を除去し得るものであれば、適宜選択して差し
支えない。この場合において、上記迷送電流を除去する
手法としては、迷送電流が対極側へ流入しないように、
例えば、迷送電流を既設あるいは新設のアースへバイパ
スさせるものを挙げることができる。尚、上記迷送電流
のバイパス効果を確実にするという観点からすれば、上
記アースをタンクの近くに設置することが望ましい。Further, the method for detecting the current between the tank bottom plate and the counter electrode may be appropriately selected as long as it can remove at least the stray current generated between the tank bottom plate and the counter electrode. In this case, the method for removing the stray current is to prevent the stray current from flowing into the opposite electrode.
For example, one that bypasses stray current to an existing or newly installed ground can be mentioned. From the viewpoint of ensuring the bypass effect of the stray current, it is desirable to install the ground near the tank.
また、タンク底板と対極との間の電圧検出方式について
は公知方法を用いることができる。Furthermore, a known method can be used to detect the voltage between the tank bottom plate and the counter electrode.
このように、タンク底板と対極との間の電流、電圧検出
方式としては上述した範囲で適宜選択して差し支えない
が、装置コストの低廉化及び測定誤差の低減化を考慮す
ると、タンク底板、対極と周波数応答解析装置との接続
回路中に内部抵抗の低い電流アンプを介装し、タンク底
板及び上記対極間に流れる電流のうち、上記対極に路面
した領域以外の電流路からの迷送電流が除去された電流
信号を上記電流アンプにて増幅すると共に電圧信号に変
換し、そして、タンク底板及び上記対極間の電圧信号と
共に、周波数応答解析装置に入力させ、この電流、電圧
信号に基づいて、タンク底板と上記対極との間の交流イ
ンピーダンスを測定することが好ましい。In this way, the current and voltage detection method between the tank bottom plate and the counter electrode can be selected as appropriate within the above range, but considering the reduction of equipment cost and measurement error, it is recommended to A current amplifier with low internal resistance is inserted in the connection circuit between the tank bottom plate and the frequency response analyzer, and the stray current from the current path other than the area facing the road surface of the counter electrode is removed from the current flowing between the tank bottom plate and the counter electrode. The removed current signal is amplified by the current amplifier and converted into a voltage signal, and is inputted to a frequency response analyzer together with the voltage signal between the tank bottom plate and the counter electrode, and based on this current and voltage signal, Preferably, the AC impedance between the tank bottom plate and the counter electrode is measured.
タンク底板側の防食塗膜が腐食し始めると、タンク底板
と対極との間の防食塗膜の交流インピーダンスが変化す
るため、これを監視することによって、腐食状態を正確
に把握することが可能である。When the anti-corrosion coating on the tank bottom plate begins to corrode, the AC impedance of the anti-corrosion coating between the tank bottom plate and the counter electrode changes, so by monitoring this, it is possible to accurately grasp the corrosion state. be.
また、周波数応答解析装置には、上記対極に路面した領
域以外の電流路からの迷送電流が入力されないようにな
っているため、測定値が正確になる。Furthermore, since stray currents from current paths other than the area facing the road surface are not input to the frequency response analyzer, the measured values are accurate.
以下、添付図面に示す実施例に基づいてこの発明を詳細
に説明する。Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
第ｌ図はタンク底板の腐食監視装置にこの発明を適用し
たー実施例である。FIG. 1 shows an embodiment in which the present invention is applied to a corrosion monitoring device for a tank bottom plate.
同図において、タンクの据え付け構造は、基礎１０の表
面に防食剤層１１を設け、その上にタンクｌ３を据え付
けている。そして、基礎１０には、第２図に示すように
、この基礎１０を四等分してその中心位置に四つの対極
１２（具体的には１２（１）〜１２（４））が埋め込ま
れている。In the same figure, the tank installation structure is such that an anticorrosive agent layer 11 is provided on the surface of a foundation 10, and a tank 13 is installed thereon. Then, as shown in Fig. 2, the foundation 10 is divided into four equal parts, and four counter electrodes 12 (specifically, 12(1) to 12(4)) are embedded in the center position. ing.
この実施例において、上記対極ｌ２は、第３図（ａ）（
ｂ）に示すように、上記タンク底板ｌ４と同材質（例え
ば炭素鋼材ＳＳ４１）の材質からなる表面積４００ｅｎ
ｒの鋼板（２００ｍｎ＋Ｘ ２ ０ ０ｍｍＸ ６ ｔ
Ｍ）からなり、表面を除いた部分にはシリコン樹脂コー
ティング１６を施すと共に、銅線からなる導線ｌ７を上
記表面部に接続したものである。In this embodiment, the counter electrode l2 is shown in FIG. 3(a) (
As shown in b), a surface area of 400 en is made of the same material as the tank bottom plate l4 (for example, carbon steel SS41).
r steel plate (200mm+X 200mmX 6t
A silicone resin coating 16 is applied to the portion except the surface, and a conductive wire 17 made of a copper wire is connected to the surface portion.
また、符号２０は周波数応答解析装置（この実施例では
エヌエフ回路設計■製Ｓ５７２０）であり、周波数が変
化する電流を供給するための一対の出力端子Ｏ、一対の
入力端子Ｘ及び一対の入力端子Ｙを有している。Further, reference numeral 20 is a frequency response analysis device (in this example, S5720 manufactured by NF Circuit Design), which has a pair of output terminals O, a pair of input terminals X, and a pair of input terminals for supplying a current whose frequency changes. It has Y.
そして、上記出力端子Ｏの一方は上記タンク側板ｌ５の
一部に接続されており、また、上記出力端子０の他方は
図示外の切り換え手段を介して各対極１２に接続されて
いる。One of the output terminals O is connected to a part of the tank side plate l5, and the other of the output terminals 0 is connected to each counter electrode 12 via a switching means not shown.
そしてまた、上記切り換え手段と周波数応答解析装置２
０の出力端子０との間には内部抵抗の低い電流アンプ３
０（＠）エヌエフ回路設計ブロック製Ｌｌ−７０．増幅
率１ ０ ’ 〜１ ０ ”（Ｖ／Ａ），抵抗１０Ω）
が直列接続されており、ここで、増幅され且つ電圧信号
に変換された電流信号が上記周波数応答解析装置２０の
対応する入力端子Ｘに入力されている。一方、上記タン
ク側板１５と上記電流アンプ３０の周波数応答解析装置
２０側との間で検出される電圧は上記周波数応答解析装
置２０の対応する入力端子Ｙに入力されている。Furthermore, the switching means and the frequency response analysis device 2
A current amplifier 3 with low internal resistance is connected between output terminal 0 of
0 (@) NL-70 manufactured by NF Circuit Design Block. Amplification factor 10' to 10'' (V/A), resistance 10Ω)
are connected in series, and the current signal that has been amplified and converted into a voltage signal is input to the corresponding input terminal X of the frequency response analyzer 20. On the other hand, the voltage detected between the tank side plate 15 and the frequency response analyzer 20 side of the current amplifier 30 is input to the corresponding input terminal Y of the frequency response analyzer 20.
更に、この実施例においては、アース３ｌが上記タンク
底板ｌ４の近傍に配設されている。Furthermore, in this embodiment, a ground 3l is provided near the tank bottom plate l4.
次に、この実施例に係るタンク底板の腐食監視装置の作
動について説明する。Next, the operation of the tank bottom plate corrosion monitoring device according to this embodiment will be explained.
今、上記周波数応答解析装置２０において、測定電圧数
Ｖで周波数範囲１ｍＨｚ〜１ ０ ０ ＫＨｚにてタン
ク底板１４と対極Ｉ２との間の交流インピーダンスを各
対極１２（１）〜１ ２ （４）に対応した個所毎に測
定したところ、第４図に示すような結果が得られた。Now, in the frequency response analyzer 20, the alternating current impedance between the tank bottom plate 14 and the counter electrode I2 is calculated by each counter electrode 12(1) to 12(4) in the frequency range of 1 mHz to 100 KHz at the measured voltage number V. When measurements were taken at each location corresponding to , the results shown in FIG. 4 were obtained.
同図によれば、各対極ｌ２の配設個所に対応する交流イ
ンピーダンスＺは周波数ｆ変化に対応して滑らかに変化
していることが理解される。そして、上記特性曲線は経
時変化に伴って全体的に交流インピーダンスＺが低下す
る方向へスムースにシフトすることも確認されている。According to the figure, it is understood that the AC impedance Z corresponding to the location where each counter electrode 12 is disposed changes smoothly in response to a change in frequency f. It has also been confirmed that the above characteristic curve shifts smoothly in a direction in which the overall AC impedance Z decreases with time.
この実施例に係る交流インピーダンスの測定精度を確認
するために、第ｌ図において上記タンク底板ｌ４の近傍
にアース３１を設けないものを比較例とすると、実施例
の交流インピーダンスＺが１０７Ω・ｃｍであるのに対
し、比較例に係る交流インピーダンスは１０’Ω・国で
あることが確認された。In order to confirm the measurement accuracy of the AC impedance according to this example, we use a comparative example in which the ground 31 is not provided near the tank bottom plate l4 in Fig. 1.The AC impedance Z of the example is 107Ω・cm. On the other hand, it was confirmed that the AC impedance of the comparative example was 10'Ω.
このことは、実施例にあっては、所定の対極１２に対向
する領域以外のタンク底板ｌ４から防食剤層１ｌを通過
する所謂迷送電流Ｉイがアース３１側へ流出してしまい
、電流アンプ３０には迷送電流■．の含まれないタンク
底板ｌ４と対極ｌ２との間の正規電流のみが流入し、迷
送電流Ｉ４による交流インピーダンスの見掛け上の低下
を防止していることを裏付けている。This means that in the embodiment, the so-called stray current Ii passing through the anticorrosion agent layer 1l from the tank bottom plate 14 other than the area facing the predetermined counter electrode 12 flows to the ground 31 side, and the current amplifier 30 has a stray current ■. This proves that only the normal current flowing between the tank bottom plate l4 and the counter electrode l2, which is not included, prevents the apparent decrease in AC impedance due to the stray current I4.
以上説明してきたように、この発明に係るタンク底板の
腐食監視方法によれば、タンク底板の腐食状況を任意の
時に、かつ、正確に測定でき、タンク底板の腐食状況を
容易に監視することができる。As explained above, according to the tank bottom plate corrosion monitoring method according to the present invention, the corrosion status of the tank bottom plate can be accurately measured at any time, and the corrosion status of the tank bottom plate can be easily monitored. can.
特に、請求項２記載のタンク底板の腐食監視方法によれ
ば、タンク底板と対極との間の電圧検出を高価な電位差
計を用いることなく、単に電流アンプを介在させた形で
行うようにしたので、装置コストの低廉化を図ることが
できるばかりか、電位差計のように、高インピーダンス
の測定対象に対して入力インピーダンスの調整を充分注
意しないと、電圧の測定誤差になり易いという事態を有
効に回避でき、その分、交流インピーダンスの測定精度
をより向上させることができる。In particular, according to the method for monitoring corrosion of a tank bottom plate according to claim 2, the voltage between the tank bottom plate and the counter electrode is detected simply by interposing a current amplifier without using an expensive potentiometer. Therefore, not only can the equipment cost be lowered, but it can also be used to reduce the possibility of voltage measurement errors if the input impedance is not adjusted with sufficient care when measuring a high impedance object such as a potentiometer. This can be avoided, and the measurement accuracy of AC impedance can be improved accordingly.
第１図はこの発明を適用したタンク底板の腐食監視装置
の一実施例を示す説明図、第２図は実施例に係るタンク
基礎部分の対極の配置関係を示す説明図、第３図（ａ）
（ｂ）は対極の平面図及びその断面図、第４図は実施例
に係る交流インピーダンス特性を示すグラフ図である。
〔符号の説明〕
１０・・・タンク基礎
ｉｔ・・・防食剤層
・・・対極
・・・タンク
・・・タンク底板
・・・周波数応答解析装置
・・・電流アンプ
・・・アースFIG. 1 is an explanatory diagram showing an embodiment of a tank bottom plate corrosion monitoring device to which the present invention is applied, FIG. )
(b) is a plan view and a cross-sectional view of the counter electrode, and FIG. 4 is a graph showing AC impedance characteristics according to the example. [Explanation of symbols] 10... Tank foundation IT... Anticorrosive layer... Counter electrode... Tank... Tank bottom plate... Frequency response analyzer... Current amplifier... Earth
Claims (1)
により監視する方法において、 タンク基礎中にタンク底板に対向する複数の対極を埋め
込み、 タンク底板と上記対極との間の交流インピーダンス測定
用の周波数応答解析装置をタンク底板及び対極に電気的
に接続し、 タンク底板及び上記対極間に流れる電流のうち、上記対
極に路面した領域以外の電流路からの迷送電流を除去し
た状態で電流検出を行うことを特徴とするタンク底板の
腐食監視方法。 ２）タンク底板の腐食状況を交流インピーダンス測定法
により監視する方法において、 タンク基礎中にタンク底板に対向する複数の対極を埋め
込み、 タンク底板と上記対極との間の交流インピーダンス測定
用の周波数応答解析装置をタンク底板及び対極に電気的
に接続すると共に、その接続回路中に内部抵抗の低い電
流アンプを介装し、 タンク底板及び上記対極間に流れる電流のうち、上記対
極に路面した領域以外の電流路からの迷送電流を除去し
た状態で上記電流アンプにて電流検出を行うと共に、 タンク底板及び上記対極間の電圧を検出し、この電流、
電圧情報に基づいて、タンク底板と上記対極との間の交
流インピーダンスを周波数応答解析装置にて測定するよ
うにしたことを特徴とするタンク底板の腐食監視方法。[Claims] 1) A method for monitoring the corrosion status of a tank bottom plate by an AC impedance measurement method, which comprises embedding a plurality of counter electrodes facing the tank bottom plate in the tank foundation, and measuring the AC impedance between the tank bottom plate and the counter electrodes. A state in which a frequency response analyzer for measurement is electrically connected to the tank bottom plate and the counter electrode, and stray current from the current flowing between the tank bottom plate and the counter electrode other than the area facing the road surface to the counter electrode is removed. A method for monitoring corrosion of a tank bottom plate, characterized in that current detection is performed in a tank bottom plate. 2) In the method of monitoring the corrosion status of the tank bottom plate by AC impedance measurement method, multiple counter electrodes facing the tank bottom plate are embedded in the tank foundation, and frequency response analysis for AC impedance measurement between the tank bottom plate and the above counter electrodes is performed. The device is electrically connected to the tank bottom plate and the counter electrode, and a current amplifier with low internal resistance is inserted in the connection circuit, so that the current flowing between the tank bottom plate and the above counter electrode is removed from the area other than the area facing the road surface to the above counter electrode. With the stray current removed from the current path, current is detected using the current amplifier, and the voltage between the tank bottom plate and the counter electrode is detected, and this current,
A method for monitoring corrosion of a tank bottom plate, characterized in that AC impedance between the tank bottom plate and the counter electrode is measured using a frequency response analyzer based on voltage information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1297615A JPH03160354A (en) | 1989-11-17 | 1989-11-17 | Method of monitoring corrosion of tank bottom plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1297615A JPH03160354A (en) | 1989-11-17 | 1989-11-17 | Method of monitoring corrosion of tank bottom plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03160354A true JPH03160354A (en) | 1991-07-10 |
Family
ID=17848851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1297615A Pending JPH03160354A (en) | 1989-11-17 | 1989-11-17 | Method of monitoring corrosion of tank bottom plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03160354A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271540A (en) * | 2006-03-31 | 2007-10-18 | Tokiko Techno Kk | Corrosion estimation apparatus and corrosion estimation method |
| CN102508018A (en) * | 2011-11-10 | 2012-06-20 | 上海电机学院 | Stray current monitoring and protecting device and method |
| JPWO2013065207A1 (en) * | 2011-11-02 | 2015-04-02 | 三菱電機株式会社 | Anti-corrosion performance deterioration detection sensor, hot water supply heating system and equipment |
| US11162887B2 (en) | 2019-07-23 | 2021-11-02 | Saudi Arabian Oil Company | Apparatus for tank bottom soil side corrosion monitoring |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59202076A (en) * | 1983-04-30 | 1984-11-15 | Hitachi Cable Ltd | Cable insulation deterioration detection method |
| JPS61111401A (en) * | 1984-11-06 | 1986-05-29 | Nippon Sharyo Seizo Kaisha Ltd | Method for detecting corrosion of buried pipe or the like |
-
1989
- 1989-11-17 JP JP1297615A patent/JPH03160354A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59202076A (en) * | 1983-04-30 | 1984-11-15 | Hitachi Cable Ltd | Cable insulation deterioration detection method |
| JPS61111401A (en) * | 1984-11-06 | 1986-05-29 | Nippon Sharyo Seizo Kaisha Ltd | Method for detecting corrosion of buried pipe or the like |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271540A (en) * | 2006-03-31 | 2007-10-18 | Tokiko Techno Kk | Corrosion estimation apparatus and corrosion estimation method |
| JPWO2013065207A1 (en) * | 2011-11-02 | 2015-04-02 | 三菱電機株式会社 | Anti-corrosion performance deterioration detection sensor, hot water supply heating system and equipment |
| US9677992B2 (en) | 2011-11-02 | 2017-06-13 | Mitsubishi Electric Corporation | Corrosion protection performance degradation detection sensor, hot-water supply heating system, and facility apparatus |
| CN102508018A (en) * | 2011-11-10 | 2012-06-20 | 上海电机学院 | Stray current monitoring and protecting device and method |
| US11162887B2 (en) | 2019-07-23 | 2021-11-02 | Saudi Arabian Oil Company | Apparatus for tank bottom soil side corrosion monitoring |
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