JPH0293315A - Thickness examining method of metallic pipe wall or the like - Google Patents
Thickness examining method of metallic pipe wall or the likeInfo
- Publication number
- JPH0293315A JPH0293315A JP24633588A JP24633588A JPH0293315A JP H0293315 A JPH0293315 A JP H0293315A JP 24633588 A JP24633588 A JP 24633588A JP 24633588 A JP24633588 A JP 24633588A JP H0293315 A JPH0293315 A JP H0293315A
- Authority
- JP
- Japan
- Prior art keywords
- wall
- temperature
- metallic pipe
- pipe
- thinned
- 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
- 238000000034 method Methods 0.000 title claims description 18
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 19
- 238000007689 inspection Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は金属管や容器の壁の厚さの検査方法に係り、特
に、内面側の減肉箇所の検査に用いて有効な検査方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for inspecting the wall thickness of metal pipes and containers, and particularly relates to an inspection method that is effective for inspecting thinning areas on the inner surface. .
「従来の技術」
原子カプラントや化学プラント等で用いられる金属管に
おいては、長年の供用期間中に、エローシコン現象や腐
食等に基づく壁の厚さの変化、例えば減肉箇所が生じて
いるか否かを検査して、その健全性を確認することが行
われている。"Prior art" In metal pipes used in atomic couplants, chemical plants, etc., it is necessary to check whether the wall thickness has changed due to the erosicon phenomenon or corrosion, such as thinning areas, during many years of service. are being inspected to confirm their soundness.
従来の検査方法は、例えば第３図に示すように、金属管
ｌの壁１ａの表面に超音波肉厚計２のセンサ部を接触さ
せて、超音波の伝播時間から肉厚を測定し、その接触位
置を（イ）（ロ）（ハ）（ニ）で示すように移動させな
がら、各部の肉厚を測定して減肉部３を探し出すように
している。In the conventional inspection method, for example, as shown in FIG. 3, the sensor part of the ultrasonic wall thickness meter 2 is brought into contact with the surface of the wall 1a of the metal tube 1, and the wall thickness is measured from the propagation time of the ultrasonic wave. While moving the contact position as shown in (a), (b), (c), and (d), the wall thickness of each part is measured to find the thinned part 3.
「発明が解決しようとする課題」
しかしながら、このような方法であると、１点ずつしか
肉厚を測定することができないため、検査範囲が広（な
ると、測定点が多数に皮んで多大の労力と時間が必要に
なり、管ｌの全域を正確に検査することは難しいという
問題がある。``Problem to be solved by the invention'' However, with this method, the thickness can only be measured at one point at a time, so the inspection range is wide (this results in a large number of measurement points, which requires a lot of labor). There is a problem in that it is difficult to accurately inspect the entire area of the pipe 1.
本発明は前記課題を有効に解決するもので、広範囲を１
度に検査して、その労力を低減し、正確な検査の実施を
図ることを目的とする。The present invention effectively solves the above problems and covers a wide range of
The purpose is to reduce the labor and ensure accurate inspections.
「課題を解決するための手段」
本発明の検査方法は、金属管等の壁の内面を加熱または
冷却して、その壁の厚さ方向に温度差を付与した状態と
し、外表面の温度分布を測定することを特徴とする特
「作用」
本発明の検査方法において、金属管等を内面から加熱ま
たは冷却すると、その壁に減肉部等が生じている場合に
は、他の部分との熱容量の相異に基づき熱伝達速度に差
か生し、このため、壁の両面間に温度差が付与されてい
る状態においては、その外表面に’ｔＴＡ度分布が生じ
る。この温度分布を測定することにより、減肉部等を容
易に検出することができるものである。"Means for Solving the Problems" The inspection method of the present invention heats or cools the inner surface of the wall of a metal tube, etc. to create a temperature difference in the thickness direction of the wall, and the temperature distribution on the outer surface is In the inspection method of the present invention, when a metal pipe, etc. is heated or cooled from the inside, if there is a thinning part on the wall, it is possible to measure the Due to the difference in heat capacity, there is a difference in the rate of heat transfer, and therefore, when a temperature difference is applied between both sides of the wall, a 'tTA degree distribution occurs on the outer surface of the wall. By measuring this temperature distribution, thinned areas and the like can be easily detected.
「実施例」
以下、本発明の検査方法の一実施例について第１図およ
び第２図を参照しながら説明する。"Example" An example of the inspection method of the present invention will be described below with reference to FIGS. 1 and 2.
この検査方法においては、金属管ｌの内部に高１晶流体
Ａと低温流体Ｂとの高低２種類の熱媒体を交互に流通さ
せて、壁１ａの内面に交番的に加熱と冷却との熱サイク
ルを与えながら、壁１ａの両面に温度差を付与した状態
として、その外表面の温度分布を例えば赤外線放射温度
計５によって遠隔で測定することにより、減肉部３を検
出するものである。２種類の熱媒体としては、ｌＯＯ°
Ｃ程度の高温蒸気と２０°Ｃ程度の冷却空気あるいは水
との組み合わせ等が適用でき、その交替は、壁ｌａの内
面と外表面との間に温度差が付与されている状態におい
て行われる。言い換えれば、壁１ａの外表面における減
肉部３と池の健全部６との温度が平衡状態となる前に交
替するのである。In this inspection method, two types of heat media, high and low, high temperature crystal fluid A and low temperature fluid B, are alternately circulated inside the metal tube 1, and heat of heating and cooling is alternately applied to the inner surface of the wall 1a. The thinned portion 3 is detected by remotely measuring the temperature distribution on the outer surface of the wall 1a with, for example, an infrared radiation thermometer 5 while applying a cycle and applying a temperature difference to both sides of the wall 1a. As two types of heat medium, lOO°
A combination of high-temperature steam of about 20° C. and cooling air or water of about 20° C. can be applied, and the replacement is performed in a state where a temperature difference is provided between the inner and outer surfaces of the wall la. In other words, the temperatures of the thinned part 3 on the outer surface of the wall 1a and the healthy part 6 of the pond are exchanged before reaching an equilibrium state.
すなわち、金属管１の中に高温流体へを流通させると、
壁１ａの外表面の温度は、第２図に減肉部３および健全
部６の各温度と時間との関係を図示した（減肉部と健全
部との温度を対応する符号を付して示した）ように、減
肉部３においては健全部６に比べて熱容量が小さいため
急激に温度上昇する。そして、両者の温度が平衡状態と
なる前に、高温流体Ａに替えて低温流体Ｂを流通させる
と、第２図の破線で示すように減肉部３、健全部６とも
温度低下するが、温度上昇時と同様、減肉部３の方が低
下速度が大きくなる。そして、このような操作を繰り返
して交番的に熱サイクルを付与すると、減肉部３と健全
部６との温度が一致する付近を避けた範囲においては、
減肉部３が健全部６と比べて高温状態あるいは低温状態
となり（第２図のＨで示す範囲においては減肉部３が健
全部６に比べて高温状態となっている）、この範囲内で
壁１ａの外表面の温度分布を測定することにより、減肉
部３を容易に検出することができるものである。なお、
熱媒体の交替時期から前記範囲（第２図においてはＨで
示す範囲）になるまでのタイムラグは、壁１ａの肉厚等
によって実験的に割り出される。That is, when high-temperature fluid is passed through the metal tube 1,
As for the temperature of the outer surface of the wall 1a, the relationship between each temperature of the thinned part 3 and the sound part 6 and time is shown in FIG. As shown in FIG. 3), the temperature in the thinned portion 3 increases rapidly because the heat capacity is smaller than that in the healthy portion 6. If low-temperature fluid B is passed instead of high-temperature fluid A before the temperatures of both reach an equilibrium state, the temperatures of both the thinned part 3 and the healthy part 6 will decrease as shown by the broken line in FIG. Similar to when the temperature rises, the rate of decrease is faster in the thinned portion 3. When such operations are repeated and heat cycles are applied alternately, within a range where the temperatures of the thinned part 3 and the healthy part 6 are avoided,
The thinned part 3 is in a high temperature or low temperature state compared to the sound part 6 (in the range shown by H in FIG. 2, the thinned part 3 is in a high temperature state compared to the sound part 6), and within this range By measuring the temperature distribution on the outer surface of the wall 1a, the thinned portion 3 can be easily detected. In addition,
The time lag from when the heat medium is replaced to when the above range (the range indicated by H in FIG. 2) is reached is determined experimentally based on the thickness of the wall 1a, etc.
また、この方法においては、温度分布を測定する手段と
して前記した赤外線放射温度計５を使用していることに
より、１回の測定で比較的広い範囲を対象とすることが
できるとともに、金属管ｌに対して遠隔地で測定を実施
することができ、その測定範囲を順次金属管ｌの長さ方
向に移動させながら金属管ｌの全域にわたって測定する
ことが行われる。したがって、その全酸分の測定に要す
る労力と時間を大幅に短縮することができ、減肉部３を
容易かつ正確に検出し得て、漏洩防止対策等を有効に図
ることかできる。In addition, in this method, by using the above-mentioned infrared radiation thermometer 5 as a means for measuring temperature distribution, it is possible to cover a relatively wide range in one measurement, and the metal tube The measurement can be carried out at a remote location, and the measurement range can be sequentially moved in the length direction of the metal tube 1 to measure the entire area of the metal tube 1. Therefore, the labor and time required to measure the total acid content can be significantly reduced, the thinned portion 3 can be detected easily and accurately, and leakage prevention measures can be effectively taken.
なお、本発明の検査方法においては、次のようにしても
よい。Note that the inspection method of the present invention may be performed as follows.
■前記一実施例では金属管の減肉部を検出するようにし
たが、他の部分よりも厚肉となっている部分の検出に適
用する（この場合は、厚内部の温度変化の速度は他の部
分よりも小さくなる）。つまり、肉厚変化部全般にわた
って適用することができる。■In the above embodiment, the thinned part of the metal tube was detected, but it is also applied to detect the part where the wall is thicker than other parts (in this case, the speed of temperature change inside the thick part is smaller than other parts). In other words, it can be applied to the entire thickness changing portion.
■金属管が比較的短い場合等には、熱媒体を１種類とし
て、温度上昇あるいは温度低下のいずれか一方向の温度
変化を利用して温度分布を測定する。■If the metal tube is relatively short, use one type of heat medium and measure the temperature distribution using temperature changes in one direction, either temperature rise or temperature decrease.
■熱媒体としてヒータを使用する。■Use a heater as a heat medium.
■温度分布を測定する手段としては、赤外線放射温度計
の使用の他、赤外線カメラを使用して温度分布像を撮影
する、金属管の外表面にサーモカラーを付着させる、熱
電対等の局部的な検温に使用される温度計を金属管の外
表面に複数配置させる、などの手段を適用することがで
きる。■In addition to using an infrared radiation thermometer, methods for measuring temperature distribution include using an infrared camera to take a temperature distribution image, attaching a thermocolor to the outer surface of a metal tube, and using local thermocouples, etc. It is possible to apply a method such as arranging a plurality of thermometers used for temperature measurement on the outer surface of the metal tube.
「発明の効果」
以上の説明から明らかなように、本発明の＠査方法によ
れば、金属管外表面の温度分布を測定しているから、１
点ずつ肉厚を測定してい〈従来方法に比べて、１度に広
範囲を検査し得て、金属管全域の検査に要する労力およ
び時間を短縮することができ、減肉部等を容易かつ正確
に検出することができるという効果を奏する。"Effects of the Invention" As is clear from the above explanation, according to the @inspection method of the present invention, the temperature distribution on the outer surface of the metal tube is measured.
Wall thickness is measured point by point (compared to conventional methods, it is possible to inspect a wider area at once, reducing the labor and time required to inspect the entire area of the metal pipe, and easily and accurately detecting thinned areas etc.) This has the effect that it can be detected.
第１図は本発明の検査方法の実施状況の例を示す説明図
、第２図は第１図における減肉部と健全部との温度変化
の状態を示す温度と時間との関係図、第３図は従来例の
検査方法の実施状況を示す説明図である。
１・・・・・・金属管、ｌａ・・・・・・壁、３・・・
・・・減肉部、５・・・・・・赤外線放射温１度計、６
・・・・・・健全部。
出願人 石川島播磨重工業株式会社
第１図
Ｌ）−５
第３図FIG. 1 is an explanatory diagram showing an example of the implementation status of the inspection method of the present invention, FIG. FIG. 3 is an explanatory diagram showing the implementation status of a conventional inspection method. 1...metal pipe, la...wall, 3...
...Thinning part, 5...Infrared radiation temperature 1 degree meter, 6
・・・・・・Health Department. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 1 L)-5 Figure 3
Claims (1)
さ方向に温度差を付与した状態とし、外表面の温度分布
を測定することを特徴とする金属管壁等の厚さの検査方
法。A method for determining the thickness of a metal pipe wall, etc., characterized by heating or cooling the inner surface of the wall of a metal pipe, etc. to create a temperature difference in the thickness direction of the wall, and measuring the temperature distribution on the outer surface. Inspection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24633588A JPH0293315A (en) | 1988-09-30 | 1988-09-30 | Thickness examining method of metallic pipe wall or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24633588A JPH0293315A (en) | 1988-09-30 | 1988-09-30 | Thickness examining method of metallic pipe wall or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0293315A true JPH0293315A (en) | 1990-04-04 |
Family
ID=17147034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24633588A Pending JPH0293315A (en) | 1988-09-30 | 1988-09-30 | Thickness examining method of metallic pipe wall or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0293315A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008185468A (en) * | 2007-01-30 | 2008-08-14 | Toshiba Corp | Device and method for measuring in-leak flow |
| JP2010237065A (en) * | 2009-03-31 | 2010-10-21 | Japan Fine Ceramics Center | Surface temperature distribution detecting apparatus and method for detecting reduction in thickness of piping by using the same |
| JP2011185926A (en) * | 2010-03-05 | 2011-09-22 | General Electric Co <Ge> | Thermal measurement system and method for leak detection |
| JP2016077973A (en) * | 2014-10-17 | 2016-05-16 | 新日鐵住金株式会社 | Deterioration diagnostic method for wall surface of electric precipitator |
| WO2018105142A1 (en) * | 2016-12-09 | 2018-06-14 | 富士通株式会社 | Method, device and system for diagnosing pipe |
| CN110297009A (en) * | 2018-03-23 | 2019-10-01 | 罗斯蒙特公司 | The diagnosis of non-intrusion type tube wall |
| WO2023064727A1 (en) * | 2021-10-14 | 2023-04-20 | Saudi Arabian Oil Company | Thermoelectric polymer system for corrosion monitoring |
-
1988
- 1988-09-30 JP JP24633588A patent/JPH0293315A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008185468A (en) * | 2007-01-30 | 2008-08-14 | Toshiba Corp | Device and method for measuring in-leak flow |
| JP2010237065A (en) * | 2009-03-31 | 2010-10-21 | Japan Fine Ceramics Center | Surface temperature distribution detecting apparatus and method for detecting reduction in thickness of piping by using the same |
| JP2011185926A (en) * | 2010-03-05 | 2011-09-22 | General Electric Co <Ge> | Thermal measurement system and method for leak detection |
| JP2016077973A (en) * | 2014-10-17 | 2016-05-16 | 新日鐵住金株式会社 | Deterioration diagnostic method for wall surface of electric precipitator |
| WO2018105142A1 (en) * | 2016-12-09 | 2018-06-14 | 富士通株式会社 | Method, device and system for diagnosing pipe |
| CN110297009A (en) * | 2018-03-23 | 2019-10-01 | 罗斯蒙特公司 | The diagnosis of non-intrusion type tube wall |
| WO2023064727A1 (en) * | 2021-10-14 | 2023-04-20 | Saudi Arabian Oil Company | Thermoelectric polymer system for corrosion monitoring |
| US20230119818A1 (en) * | 2021-10-14 | 2023-04-20 | Saudi Arabian Oil Company | Thermoelectric polymer system for corrosion monitoring |
| US11815444B2 (en) | 2021-10-14 | 2023-11-14 | Saudi Arabian Oil Company | Thermoelectric polymer system for corrosion monitoring |
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