JPH01320457A - Method and system for warning material damage - Google Patents
Method and system for warning material damageInfo
- Publication number
- JPH01320457A JPH01320457A JP15232288A JP15232288A JPH01320457A JP H01320457 A JPH01320457 A JP H01320457A JP 15232288 A JP15232288 A JP 15232288A JP 15232288 A JP15232288 A JP 15232288A JP H01320457 A JPH01320457 A JP H01320457A
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- alarm
- value
- material damage
- corrosion rate
- 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
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 27
- 230000007797 corrosion Effects 0.000 claims abstract description 61
- 238000005260 corrosion Methods 0.000 claims abstract description 61
- 239000000523 sample Substances 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims 1
- 230000002123 temporal effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
Landscapes
- 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〕
本発明は材料の腐食状況を検知する方法、及びシステム
に係り特に、腐食損傷に対し警報を発する方法及びシス
テムに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and system for detecting the state of corrosion of a material, and more particularly to a method and system for issuing a warning against corrosion damage.
通常、プラントの腐食診断は運転休止時か、あるいは運
転中に実施される。運転休止時には、従来より構造材料
の厚みや侵食凹み、機械的性質、割れ等を測定する方法
がとられてきた。しかし、測定の間隔が長いために、事
故の発生を予測できない等の問題があった。そこで、運
転中の腐食速度測定が種々試みられてきた。代表的なも
のが電気化学的な腐食速度の計測である。方法には分極
抵抗法、交流インピーダンス法、クーロスタット法など
がある。腐食速度の計画には、試料電極、対極、照合電
極より成る三電極、あるいは、照合電極を用いない二電
極をプローブとして用い対象とする位置に設置したプロ
ーブから得られる信号を測定器、コンピュータを介して
腐食速度に換算する。また、電気抵抗法などの電気的方
法も腐食速度の計測に用いられる。この方法は腐食によ
り金属体内部を流れる電気抵抗が増大することを利用し
ており、抵抗の増加傾向から腐食状況を知ることができ
る。上述の方法は材料の腐食速度を知ることはできるが
、材料損傷に対する判断規準がなく、プラント等の運転
管理に支障をきたす懸念がある。Corrosion diagnosis of a plant is typically performed during outage or during operation. Conventionally, when a plant is out of operation, the thickness, erosion dents, mechanical properties, cracks, etc. of structural materials are measured. However, because the measurement intervals are long, there are problems such as the inability to predict the occurrence of accidents. Therefore, various attempts have been made to measure the corrosion rate during operation. A typical example is electrochemical corrosion rate measurement. Methods include polarized resistance method, AC impedance method, and coulostat method. To plan the corrosion rate, a three-electrode probe consisting of a sample electrode, a counter electrode, and a reference electrode, or two electrodes without a reference electrode is used as a probe, and the signal obtained from the probe installed at the target location is used with a measuring instrument and a computer. Convert to corrosion rate via Electrical methods such as electrical resistance methods are also used to measure corrosion rates. This method utilizes the fact that the electrical resistance flowing inside the metal body increases due to corrosion, and the state of corrosion can be determined from the tendency of the resistance to increase. Although the above-mentioned method can determine the corrosion rate of a material, there is no criterion for determining material damage, and there is a concern that this may impede the operation management of a plant or the like.
そこで、材料損傷に対して警報を一発する方法およびシ
ステムが提案されている。例えば、Ｊ、Ｅ。Therefore, methods and systems have been proposed that issue a single alarm in response to material damage. For example, J, E.
Ｇｕｔｈｒｉｅ、ｅｔａｌ、Ｃｏｒｒｏｓｉｏｎ ’
８６．ｐａｐｅｒ ＃３５．Ｈｏｕｓｔｏｎ。Guthrie, etal, Corrosion'
86. paper #35. Houston.
ＵＳＡ（Ｍａｒｃｈ １７−２１．１９８６）によれば
、プローブを用いて得られた信号はコンピュータを用い
て金属の腐食減量及び腐食速度に変換され、次いで、警
報状態にあるかどうかを判断したのち、データは記憶素
子に蓄積される。予報状態は次のように定義されている
。すなわち、一つは閾値の設定に基づく警報、二つめは
目標値からのずれ巾の設定に基づく警報、三つめは入力
した値の変化がある非常に速い値を越えることに基づく
警報であり、以上三つのうちの少なくとも一つ以上を設
定した警報を行うというものである。According to the USA (March 17-21.1986), the signals obtained using the probe are converted into metal corrosion loss and corrosion rate using a computer, and then after determining whether there is an alarm condition, Data is stored in storage elements. The forecast state is defined as follows. That is, one is an alarm based on the setting of a threshold value, the second is an alarm based on the setting of the deviation width from the target value, and the third is an alarm based on the input value changing exceeding a certain very fast value. This is to issue an alarm with at least one of the above three settings set.
上記従来技術は、警報の在り方に触れているが。 The above-mentioned prior art touches on the state of alarms.
対象とする機器の信頼性を確保するに十分な考慮がなさ
れていない。たとえば、閾値ないしは、ずれ巾の設定に
よる警報の場合、腐食速度について考えると、何らかの
原因により、−時的にその速度が閾値あるいは、ずれ巾
を越えたとしても、機器の信頼性には問題がない場合が
多い。こうした現象を避けるために閾値を高めに設定す
るか、あるいは、ずれ巾を大きくとると、今度は閾値を
越えないが非常に近い状態、すなわち、相当に材料損傷
が懸念される状態が長く続いても察知できないこともで
てくる。また、信号にはノイズが付きものであるが、三
つの設定に基づく警報は、このノイズをも警報として出
力する懸念があり、本来の警報の役目を果さない状態に
おちいるおそれがある。Sufficient consideration has not been given to ensuring the reliability of the target equipment. For example, in the case of an alarm based on the setting of a threshold value or deviation range, if we consider the corrosion rate, even if the speed temporarily exceeds the threshold value or deviation range for some reason, there will be a problem with the reliability of the equipment. There are many cases where there is no. In order to avoid this phenomenon, if the threshold value is set high or if the deviation width is made large, a state in which the threshold value is not exceeded but very close to it, that is, a state in which there is considerable concern about material damage, will continue for a long time. There are also things that cannot be detected. Further, although signals are always accompanied by noise, there is a concern that the alarm based on the three settings will also output this noise as an alarm, and there is a risk that the alarm will not fulfill its original role.
本発明の目的は、工業的なレベルから１機器の信頼性を
確保するのに十分な材料損傷に対する警報方法及びシス
テムを提供することにある。An object of the present invention is to provide a warning method and system for material damage sufficient to ensure the reliability of a piece of equipment at an industrial level.
上記目的は、測定により得られた腐食速度の信号を次の
手順で処理することにより達成される。The above object is achieved by processing the corrosion rate signal obtained by measurement in the following procedure.
すなわち、腐食速度信号の入力から警報を発するに至る
までの論理構造を以下に示す。腐食速度（ｖ）に二つの
閾値（Ｖｌ及びＶ２）をあらかじめ設定する。但し、ｖ
２）ｖｌである。Ｖｌは直ちに警報を発する必要はない
が、■が長＜Ｖｌ を越えるようだと材料損傷の懸念が
ある値とする。また、Ｖ２は損傷の懸念が大きく、直ち
に警報を発する必要のある値とする。従って、ｖ ＜
Ｖ １であれば初期状態にあるが、ｖ２＞ｖ≧■１ある
いは■≧ｖ２の場合には警報発生のための処理を開始す
る。Ｖ２＞Ｖ２Ｖ５の場合、腐食速度（Ｖ）の時間変化
から腐食量（ｍ）を算出する演算処理を開始し、ｍが所
定値（ｍｏ ）を越えた場合に警報を発する。なお、演
算処理中にＶがＶｌ を下回り、それが所定時間経続し
た場合には、材料損傷の懸念はなくなったものと判断し
、初期状態に戻る。That is, the logical structure from inputting a corrosion rate signal to issuing an alarm is shown below. Two threshold values (Vl and V2) are set in advance for the corrosion rate (v). However, v
2) It is vl. Vl does not need to immediately issue an alarm, but if ■ exceeds length<Vl, it is considered a value that may cause material damage. Furthermore, V2 is a value that is highly likely to cause damage and requires immediate warning. Therefore, v <
If V1, it is in the initial state, but if v2>v≧■1 or ■≧v2, processing for generating an alarm is started. When V2>V2V5, arithmetic processing is started to calculate the amount of corrosion (m) from the change in corrosion rate (V) over time, and an alarm is issued when m exceeds a predetermined value (mo 2 ). If V falls below Vl during arithmetic processing and this continues for a predetermined period of time, it is determined that there is no longer any concern about material damage, and the process returns to the initial state.
一方、Ｖ２Ｖ５の場合は、直ちに警報を発するものとす
る。なお、ノイズ等を原因として一時的にＶがこの範囲
に入り得る可能性もあるため、警報はこの状態が所定時
間継続した場合とする。On the other hand, in the case of V2V5, an alarm shall be issued immediately. Note that since there is a possibility that V may temporarily fall within this range due to noise or the like, an alarm is issued when this state continues for a predetermined period of time.
ところで、腐食速度の測定には連続と非連続の場合が考
えられるが、非連続の場合には、Ｖ２Ｖ５の状態から、
測定間隔を狭めることにより、演算の精度を高めること
ができる。また、腐食速度の閾値のｖｌ及びＶ２．腐食
量の閾値のｍ。等は測定対象の状況に応じて任意に変え
ることができるようにすれば、警報の精度をより一層高
めることができる。By the way, continuous and discontinuous cases can be considered for the measurement of corrosion rate, but in the case of discontinuous, from the state of V2V5,
By narrowing the measurement interval, the accuracy of calculation can be improved. Also, the corrosion rate threshold vl and V2. Corrosion amount threshold m. etc., can be changed arbitrarily according to the situation of the object to be measured, so that the accuracy of the alarm can be further improved.
また、材料損傷の警報は上述した腐食速度の大小を基準
に発するばかりではなく、腐食量そのものを基準にとる
こともできる。たとえば、対象機器、プラントの起動時
、あるいは、任意の時点から腐食速度を腐食量に換算し
、その量で警報を発するのも一つの考えである。Moreover, the material damage alarm can be issued not only based on the magnitude of the corrosion rate described above, but also based on the amount of corrosion itself. For example, one idea is to convert the corrosion rate into the amount of corrosion when starting up the target equipment or plant, or at any other time, and issue an alarm based on that amount.
上記した内容は材料損傷に対する警報だが、この方法及
びシステムを対象環境に対する警報としても用い得る。Although what has been described above is a warning for material damage, the method and system can also be used as a warning for a target environment.
例えば、原子力、あるいは、火力プラントにおいて、材
料の腐食速度測定用のプローブを設置すれば、その環境
の腐食性、あるいは、防食性を本発明の手法により判断
できる。プローブを１３ＷＲプラントの再循環系、ある
いは、炉水浄化系から分岐した炉水中に浸漬した場合、
水質変化を材料の腐食速度という形の信号で知ることが
でき、最適水質の選定、あるいは、警報として知り得る
６また。材料の使用寿命を腐食量に基づいて算出し、警
報を発する考えもある。For example, if a probe for measuring the corrosion rate of materials is installed in a nuclear or thermal power plant, the corrosivity or anticorrosion of the environment can be determined using the method of the present invention. If the probe is immersed in the recirculation system of the 13WR plant or in the reactor water branched from the reactor water purification system,
Changes in water quality can be detected as a signal in the form of material corrosion rate, which can be used to select the optimum water quality or as a warning. There is also an idea to calculate the service life of the material based on the amount of corrosion and issue an alarm.
本発明のシステムは、測定した腐食速度を監視し、材料
の腐食損傷に対し警報を発する構造となっている。この
システムに基づけば、腐食損傷をその場で検知し、対処
することができる。The system of the present invention is configured to monitor the measured corrosion rate and issue an alarm for corrosion damage to the material. Based on this system, corrosion damage can be detected and treated on the spot.
以下、本発明の一実施例を説明する。 An embodiment of the present invention will be described below.
〈実施例１〉
プラントに備えた腐食速度計測器より、腐食速度の信号
をコンピュータに入力し、警報を発するための装置構成
を第１図に示す。<Example 1> Fig. 1 shows the configuration of a device for inputting a corrosion rate signal from a corrosion rate measuring device provided in a plant into a computer and issuing an alarm.
プラント内に備えた電極はチャンネルセレクタを介して
腐食速度計測器とＧＰ−ＩＢにより接続されている。さ
らに、ＧＰ−ＩＢによりコンピュータと接続され、警報
発生装置とも結ばれている。The electrodes provided in the plant are connected to the corrosion rate measuring device via a channel selector by GP-IB. Furthermore, it is connected to a computer via GP-IB and is also connected to an alarm generating device.
本発明によれば、プラントの構成材料等の腐食状況を把
握し、材料損傷を逸早く検知し、対処することができる
。According to the present invention, it is possible to grasp the corrosion status of the constituent materials of a plant, quickly detect material damage, and take appropriate measures.
第１図は本発明の一実施例のブロック図である。 FIG. 1 is a block diagram of one embodiment of the present invention.
Claims (1)
を測定器、コンピュータを介して演算処理して材料損傷
の警報を発する方法において、あらかじめ二つの腐食速
度を設定し、測定値が小さい方の設定値を越えた場合に
、測定された前記腐食速度を時間で積分して、腐食量に
換算する演算処理を開始し、前記腐食量があらかじめ設
定した値を越えた場合、あるいは、測定値が大きい方の
設定値を越えた場合に警報を発することを特徴とする材
料損傷警報方法。 ２、前記演算処理は前記測定値が前記小さい方の設定値
を所定時間継続して下回つたのちに終了し、初期状態に
戻ることを特徴とする特許請求の範囲第１項記載の材料
損傷警報方法。 ３、腐食速度の測定が非連続の場合、前記演算処理の期
間中は、測定間隔を狭めることにを特徴とする特許請求
の範囲第１項記載の材料損傷警報方法。 ４、前記測定値が前記大きい方の設定値を所定時間継続
して越えた場合に警報を発することを特徴とする特許請
求の範囲第１項記載の材料損傷警報方法。 ５、前記腐食速度の設定値、あるいは前記腐食量の設定
値を測定対象の状況に応じて適宜変えて警報を発するこ
とを特徴とする特許請求の範囲第１項記載の材料損傷警
報方法。 ６、材料の腐食速度測定用のプローブから得られた信号
を測定器、コンピュータを介して演算処理して材料損傷
の警報を発するシステムにおいて、 測定値の経時変化から腐食量を算出する機能をもち、前
記腐食量に基づいて警報を発することを特徴とする材料
損傷警報システム。 ７、材料の腐食速度測定用のプローブから得られた信号
を測定器、コンピュータを介して演算処理して材料損傷
の警報を発する方法において、前記腐食速度測定の開始
、あるいは任意の時点から前記腐食速度を腐食量に換算
し、前記腐食量が所定値を越えた場合に警報を発するこ
とを特徴とする材料損傷警報方法。 ８、材料の腐食速度測定用のプローブから得られた信号
を測定器、コンピュータを介して演算処理して材料損傷
の警報を発するシステムにおいて、 測定が非連続の場合、測定値の大小に応じてその後の測
定間隔を変える機能をもつことを特徴とする材料損傷警
報システム。 ９、原子力あるいは火力プラントにおいて、材料の腐食
速度測定用のプローブを所定の位置に設置し、測定値か
ら前記プローブの設置位置環境の腐食性を判断し、環境
変化による材料損傷の警報を発することを特徴とする材
料損傷警報方法。 １０、原子力あるいは火力プラントにおいて、材料の腐
食速度測定用のプローブを所定の位置に設置し、測定値
の経時変化から腐食量を算出し、材料の使用寿命に対し
て警報を発することを特徴とする材料損傷警報方法。[Claims] 1. In a method of issuing a material damage alarm by processing signals obtained from a probe for measuring the corrosion rate of a material through a measuring instrument and a computer, two corrosion rates are set in advance. , when the measured value exceeds the smaller set value, arithmetic processing is started to integrate the measured corrosion rate over time and convert it into a corrosion amount, and when the corrosion amount exceeds the preset value A material damage alarm method characterized in that an alarm is issued when a measured value exceeds a set value, whichever is greater. 2. Material damage according to claim 1, wherein the calculation process ends after the measured value remains below the smaller set value for a predetermined period of time, and returns to the initial state. Alarm method. 3. The material damage alarm method according to claim 1, characterized in that when the corrosion rate is measured discontinuously, the measurement interval is narrowed during the calculation processing period. 4. The material damage alarm method according to claim 1, wherein an alarm is issued when the measured value continuously exceeds the larger set value for a predetermined period of time. 5. The material damage alarm method according to claim 1, wherein the alarm is issued by appropriately changing the set value of the corrosion rate or the set value of the corrosion amount depending on the situation of the object to be measured. 6. In a system that issues a warning of material damage by processing signals obtained from a probe for measuring the corrosion rate of materials via a measuring device and a computer, it has a function to calculate the amount of corrosion from changes in measured values over time. , a material damage warning system characterized in that a warning is issued based on the amount of corrosion. 7. In a method for issuing a material damage alarm by processing signals obtained from a probe for measuring the corrosion rate of a material through a measuring instrument and a computer, the corrosion A material damage warning method characterized by converting the speed into a corrosion amount and issuing an alarm when the corrosion amount exceeds a predetermined value. 8. In a system that issues a warning of material damage by processing signals obtained from a probe for measuring the corrosion rate of materials through a measuring instrument and a computer, if the measurements are discontinuous, the A material damage warning system characterized by having a function of changing subsequent measurement intervals. 9. In a nuclear or thermal power plant, a probe for measuring the corrosion rate of materials is installed at a predetermined position, the corrosivity of the environment at the location of the probe is determined from the measured value, and an alarm is issued for material damage due to environmental changes. A material damage alarm method characterized by: 10.In a nuclear or thermal power plant, a probe for measuring the corrosion rate of materials is installed at a predetermined position, the amount of corrosion is calculated from the change in the measured value over time, and an alarm is issued regarding the service life of the material. material damage alarm method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15232288A JPH01320457A (en) | 1988-06-22 | 1988-06-22 | Method and system for warning material damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15232288A JPH01320457A (en) | 1988-06-22 | 1988-06-22 | Method and system for warning material damage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01320457A true JPH01320457A (en) | 1989-12-26 |
Family
ID=15537996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15232288A Pending JPH01320457A (en) | 1988-06-22 | 1988-06-22 | Method and system for warning material damage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01320457A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011080770A (en) * | 2009-10-02 | 2011-04-21 | Nomura Micro Sci Co Ltd | Method for testing corrosion of metal |
| CN109204869A (en) * | 2018-08-15 | 2019-01-15 | 顺丰航空有限公司 | Rate of corrosion calculation method, Aircraft Corrosion monitoring method, equipment and storage medium |
-
1988
- 1988-06-22 JP JP15232288A patent/JPH01320457A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011080770A (en) * | 2009-10-02 | 2011-04-21 | Nomura Micro Sci Co Ltd | Method for testing corrosion of metal |
| CN109204869A (en) * | 2018-08-15 | 2019-01-15 | 顺丰航空有限公司 | Rate of corrosion calculation method, Aircraft Corrosion monitoring method, equipment and storage medium |
| CN109204869B (en) * | 2018-08-15 | 2021-05-04 | 顺丰航空有限公司 | Corrosion rate calculation method, aircraft corrosion monitoring method, equipment and storage medium |
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