JPH05264512A - Method and device for inspecting piping - Google Patents
Method and device for inspecting pipingInfo
- Publication number
- JPH05264512A JPH05264512A JP4060796A JP6079692A JPH05264512A JP H05264512 A JPH05264512 A JP H05264512A JP 4060796 A JP4060796 A JP 4060796A JP 6079692 A JP6079692 A JP 6079692A JP H05264512 A JPH05264512 A JP H05264512A
- Authority
- JP
- Japan
- Prior art keywords
- defect
- pipe
- width
- signal
- detected
- 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.)
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、配管の腐食状況の検査
診断技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for inspecting and diagnosing the corrosion state of piping.
【０００２】[0002]
【従来の技術】この種の配管の検査方法としては、長手
方向の異なった位置に送信コイルと受信コイルとを備え
た検知フローブを導電体の配管内で移動させ、送信コイ
ルにより、このコイルの周部に磁界を発生させ、配管内
に発生する渦電流により配管内に存在する欠陥の状況を
把握する方法が知られている。即ち、欠陥により乱れる
渦電流の状態を、欠陥周りに形成される磁界の変化とし
て前述の受信コイルにより検出して、欠陥の状況を把握
するものである。そして、このような配管の検査方法を
採用する装置としては、前述の検知プローブ、その管内
導入装置、さらには電源、検出装置等を備えた配管の検
査装置があった。2. Description of the Related Art As a method of inspecting a pipe of this type, a detecting probe provided with a transmitting coil and a receiving coil at different positions in a longitudinal direction is moved in a pipe of a conductor, and the transmitting coil is used to move this coil. A method is known in which a magnetic field is generated in the peripheral portion and the situation of defects existing in the pipe is grasped by the eddy current generated in the pipe. That is, the state of the defect is grasped by detecting the state of the eddy current disturbed by the defect as the change of the magnetic field formed around the defect by the receiving coil. As an apparatus that adopts such a pipe inspection method, there is a pipe inspection apparatus including the above-described detection probe, a pipe introducing apparatus thereof, a power supply, a detection apparatus, and the like.
【０００３】[0003]
【発明が解決しようとする課題】しかし上記従来技術に
おいては、欠陥信号強度が欠陥の深さ及び開口径に依存
するため、この情報のみからは欠陥の深さを正しく推定
することはできず、欠陥の有無、その位置の確認を主な
目的とするものであった。一方、このような配管の検査
の目的は、配管自体に存在する欠陥の程度（特に欠陥深
さの状況）により、この配管に対する保守作業が必要で
あるかどうかの判断をできるようにすることにある。し
かしながら、従来のような欠陥を検知する方法及び装置
では、この目的を達成することはできなかった。そこで
本発明の目的は、欠陥の有無、位置を検出することが可
能であるとともに、さらに、検出される欠陥の開口径及
びその欠陥深さを推定して、検知することが可能な配管
の検査方法及びその装置を得ることにある。However, in the above-mentioned prior art, since the defect signal intensity depends on the depth of the defect and the opening diameter, the depth of the defect cannot be correctly estimated from only this information. The main purpose was to confirm the presence or absence of defects and their positions. On the other hand, the purpose of such pipe inspection is to make it possible to judge whether or not maintenance work is required for this pipe based on the degree of defects existing in the pipe itself (particularly the condition of the defect depth). is there. However, the conventional method and apparatus for detecting a defect cannot achieve this object. Therefore, an object of the present invention is to inspect a pipe capable of detecting the presence or absence of a defect and the position thereof, and further estimating and estimating the opening diameter and the defect depth of the detected defect. To obtain a method and an apparatus thereof.
【０００４】[0004]
【課題を解決するための手段】この目的を達成する本発
明による配管の検査方法の特徴手段は、配管の管軸方向
に沿って検出される探傷信号に於ける欠陥対応信号部の
管軸方向での欠陥信号幅と欠陥信号強度幅とを検出し、
欠陥信号幅より欠陥の開口径を推定するとともに、予
め、欠陥の開口径をパラメータとした欠陥信号強度幅と
欠陥深さの関係指標を求めておき、この関係指標を参照
して、推定された開口径と検出された前記欠陥信号強度
幅とより欠陥深さを推定することにある。To achieve this object, the characteristic means of the pipe inspection method according to the present invention is the pipe axial direction of the defect-corresponding signal portion in the flaw detection signal detected along the pipe axial direction. The defect signal width and the defect signal intensity width at
The opening diameter of the defect is estimated from the defect signal width, and in advance, the relation index between the defect signal intensity width and the defect depth with the aperture diameter of the defect as a parameter is obtained, and the relation index is estimated. The defect depth is estimated from the opening diameter and the detected defect signal intensity width.
【０００５】さらに、配管の検査装置の特徴構成は、欠
陥の開口径をパラメータとした欠陥信号強度幅と欠陥深
さの関係指標を記憶する記憶手段と、配管の管軸方向に
沿って検出される探傷信号に於ける欠陥対応信号部の管
軸方向の欠陥信号幅と欠陥信号強度幅とを検出する探傷
信号処理手段と、欠陥信号幅より欠陥の開口径を推定す
るとともに、関係指標を参照して、推定された開口径と
検出された欠陥信号強度幅とより欠陥深さを推定する推
定手段とを備えたことにあり、それらの作用・効果は次
に通りである。Further, the characteristic structure of the pipe inspection apparatus is detected along a pipe axis direction of the pipe and a storage means for storing a relational index of the defect signal intensity width and the defect depth with the opening diameter of the defect as a parameter. Flaw detection signal processing means for detecting the defect signal width and the defect signal intensity width in the pipe axis direction of the defect corresponding signal portion in the flaw detection signal, and estimating the aperture diameter of the defect from the defect signal width, and referencing the relation index Then, the estimated aperture diameter, the detected defect signal intensity width, and the estimating means for estimating the defect depth are provided, and their actions and effects are as follows.
【０００６】[0006]
【作用】上記のような技術において得られる探傷信号
は、その固有の特性として、管軸方向での欠陥信号幅が
ほぼ欠陥の開口径にのみ関係する情報であり、欠陥信号
強度幅がほぼ欠陥の開口径と欠陥深さに関係する情報で
ある。従って、本願においてはこの特性を積極的に利用
して、配管の保守・管理に非常に重要な情報である欠陥
深さを精度良く検知しようとする。即ち、本願の配管の
検査方法においては、先ず、探傷信号の欠陥対応信号部
の欠陥信号幅及び欠陥信号強度幅が検出される。そし
て、欠陥信号幅により欠陥の開口径が推定される。その
後、この推定値と、欠陥信号強度幅に基づき別途求めら
れている欠陥の開口径をパラメータとした欠陥信号強度
幅と欠陥深さの関係指標より、欠陥深さの推定値が求め
られる。さらに、この方法を実行するため、配管の検査
装置には、記憶手段と、探傷信号処理手段及び推定手段
が備えられる。The flaw detection signal obtained by the above-mentioned technique has a unique characteristic that the defect signal width in the tube axis direction is substantially related only to the opening diameter of the defect, and the defect signal intensity width is almost the defect. This information is related to the opening diameter and the defect depth. Therefore, in the present application, this characteristic is positively used to accurately detect the defect depth, which is very important information for maintenance and management of piping. That is, in the pipe inspection method of the present application, first, the defect signal width and the defect signal intensity width of the defect corresponding signal portion of the flaw detection signal are detected. Then, the opening diameter of the defect is estimated from the defect signal width. After that, the estimated value of the defect depth is obtained from this estimated value and the relationship index of the defect signal intensity width and the defect depth, which is obtained separately based on the defect signal intensity width, using the defect opening diameter as a parameter. Further, in order to execute this method, the pipe inspection device is provided with a storage unit, a flaw detection signal processing unit, and an estimation unit.
【０００７】[0007]
【発明の効果】従って、欠陥の有無、位置を検出するこ
とが可能であるとともに、検出される欠陥の開口径及び
その欠陥深さを推定して、この情報を得ることが可能な
配管の検査方法及びその装置が得られ、本発明により欠
陥の開口径という情報が混在しない状態の欠陥深さに関
する情報を、探傷信号から精度良く推定できるようにな
った。Therefore, it is possible to detect the presence or absence of a defect and the position thereof, and to estimate the opening diameter of the detected defect and the defect depth thereof to obtain this information. A method and an apparatus therefor can be obtained, and according to the present invention, it becomes possible to accurately estimate information on a defect depth in a state where information of an opening diameter of a defect does not coexist from a flaw detection signal.
【０００８】[0008]
【実施例】本願の実施例を図面に基づいて説明する。こ
の配管の検査は、検査装置１に備えられている検知プロ
ーブ２を配管３内に挿入するとともに、これを移動させ
て配管３の外周部にある欠陥４の状況を検出しようとす
るものである。検査方法の原理について説明すると、図
１（イ）に示されるように、検知プローブ２の長手方向
で異なった位置に配設される送信コイル５及び受信コイ
ル６を利用して、欠陥４の検査がおこなわれるのである
が、検査においては、送信コイル５に３５Ｈｚ前後の交
流が流され、配管３に渦電流７が発生される。そして、
欠陥４の存在により乱れる渦電流７により発生する間接
磁場８が、受信コイル６でとらえて、磁界の位相変化か
ら管外面の欠陥４が把握される。ここで、図示する実施
例においては、送信コイル５の軸芯と配管３の軸芯とが
平行に配設され、受信コイル６の軸芯が配管３の軸芯に
対して直角に配設されている。図１（ロ）には、管軸方
向の位置を横軸とした探傷信号の状態を示した。探傷信
号中、フラットな部位は配管３に欠陥４が無い正常な部
位であり、この正常部位とは異なった値を示している部
位が欠陥４がある欠陥対応信号部である。Embodiments of the present application will be described with reference to the drawings. In the inspection of this pipe, the detection probe 2 provided in the inspection device 1 is inserted into the pipe 3 and is moved to detect the state of the defect 4 on the outer peripheral portion of the pipe 3. .. Explaining the principle of the inspection method, as shown in FIG. 1A, the inspection of the defect 4 is performed by using the transmitting coil 5 and the receiving coil 6 arranged at different positions in the longitudinal direction of the detection probe 2. However, in the inspection, an alternating current of about 35 Hz is applied to the transmission coil 5, and an eddy current 7 is generated in the pipe 3. And
The indirect magnetic field 8 generated by the eddy current 7 disturbed by the presence of the defect 4 is caught by the receiving coil 6, and the defect 4 on the outer surface of the tube is grasped from the phase change of the magnetic field. Here, in the illustrated embodiment, the axis of the transmitter coil 5 and the axis of the pipe 3 are arranged in parallel, and the axis of the receiver coil 6 is arranged at right angles to the axis of the pipe 3. ing. FIG. 1B shows the state of the flaw detection signal with the position in the tube axis direction as the horizontal axis. In the flaw detection signal, a flat portion is a normal portion having no defect 4 in the pipe 3, and a portion showing a value different from the normal portion is a defect corresponding signal portion having the defect 4.
【０００９】本願の配管の検査方法を説明する前に、こ
の装置１全体の概略構成を図２に基づいて説明する。配
管の検査装置１は、前述の検知プローブ２と、この検知
プローブ２を先端に備えたケーブル９、このケーブル９
用のケーブルドラム１０を備え、さらにケーブル送り出
し用のケーブル自動送り装置１１を備えるともに、この
送り装置１１に走行指令を出す走行装置コントローラ１
２を備えている。また、装置１には検知プローブ２に備
えられる送信コイル５、受信コイル６の制御をおこなう
とともに、検出情報を得る欠陥検査装置１３が備えら
れ、これらの走行装置コントローラ１２、欠陥検査装置
１３からの配管内位置情報、検出出力情報等の情報を処
理する処理装置１４が備えられ、検出情報は、これに送
られて処理され、図１（イ）に示すような探傷信号が出
力装置１５により出力される。Before describing the pipe inspection method of the present application, a schematic configuration of the entire apparatus 1 will be described with reference to FIG. The pipe inspection device 1 includes the above-described detection probe 2, a cable 9 provided with the detection probe 2 at its tip, and this cable 9
And a cable automatic feeding device 11 for feeding a cable, and a traveling device controller 1 for issuing a traveling command to the feeding device 11.
Equipped with 2. Further, the device 1 is provided with a defect inspection device 13 that controls the transmission coil 5 and the reception coil 6 provided in the detection probe 2 and obtains detection information. A processing device 14 for processing information such as in-pipe position information and detection output information is provided, and the detection information is sent to and processed by the processing device 14, and a flaw detection signal as shown in FIG. To be done.
【００１０】以上が、配管の検査装置１の概略構成であ
るが、以下に本願の配管３の検査方法を採用する欠陥の
開口径、欠陥深さの推定方法及びその処理手段１６の構
成について説明する。ここで、この処理手段１６は前述
の処理装置１４に内蔵されるものである。The above is a schematic configuration of the pipe inspection apparatus 1. The following will describe the method of estimating the defect opening diameter and the defect depth and the configuration of the processing means 16 thereof, which adopts the inspection method of the pipe 3 of the present application. To do. Here, the processing means 16 is built in the processing device 14 described above.
【００１１】即ち処理手段１６は、管軸方向での欠陥信
号幅と欠陥の開口径の関係を記憶した第一関係指標（実
際は図４に示すような関係グラフ又はテーブル）と、欠
陥の開口径をパラメータとした欠陥信号強度幅と欠陥深
さの第二関係指標（実際は図５に示すような関係グラフ
又はテーブル）を記憶した記憶手段１６ａを備えるとと
もに、配管３の管軸方向に沿って検出される探傷信号に
於ける欠陥対応信号部の管軸方向での欠陥信号幅（図１
（ロ）においてＳｗで示す）と欠陥信号強度幅（図１
（ロ）においてＳｈで示す）とを検出する探傷信号処理
手段１６ｂと、欠陥信号幅Ｓｗより欠陥の開口径を推定
するとともに、第二関係指標に基づいて、推定された欠
陥の開口径と検出された欠陥信号強度幅Ｓｈとより欠陥
深さを推定する推定手段１６ｃを備えて構成されてい
る。That is, the processing means 16 stores a first relation index (actually a relation graph or table as shown in FIG. 4) storing the relation between the defect signal width in the tube axis direction and the defect opening diameter, and the defect opening diameter. With a storage means 16a storing a second relation index (actually, a relation graph or table as shown in FIG. 5) of the defect signal intensity width and the defect depth with the parameter as a parameter, and is detected along the pipe axis direction of the pipe 3. The defect signal width in the pipe axis direction of the defect corresponding signal portion in the detected flaw detection signal (Fig. 1
In (b), indicated by Sw) and the defect signal intensity width (FIG. 1).
(Indicated by Sh in (b)) and the flaw detection signal processing means 16b for detecting the defect opening width, and the defect opening width is estimated from the defect signal width Sw, and the estimated opening diameter of the defect is detected based on the second relation index. The defect signal strength width Sh and the estimating means 16c for estimating the defect depth are provided.
【００１２】ここで、このような送信、受信コイルを伴
った磁気による探傷方法においては、探傷信号は、管軸
方向での欠陥信号幅Ｓｗがほぼ欠陥の開口径にのみ関係
する情報であり、欠陥信号強度幅Ｓｈがほぼ欠陥の開口
径と欠陥深さに関係する情報である。従って、本願に開
示する方法は、この特徴を積極的に利用して、配管の保
守・管理に非常に重要な情報である欠陥深さを精度良く
検知しようとするものである。以下、図３、図４、図５
に基づいて本願の配管検査方法の手順について説明す
る。ここで、図３には欠陥状況の推定手順フローが、図
４には欠陥信号幅Ｓｗと欠陥の開口径の関係が、さらに
図５には、欠陥の開口径をパラメータとした欠陥信号強
度幅Ｓｈと欠陥深さの関係が示されている。Here, in such a flaw detection method using magnetism with the transmitting and receiving coils, the flaw detection signal is information in which the defect signal width Sw in the tube axis direction is related only to the aperture diameter of the defect, The defect signal intensity width Sh is information related to the defect opening diameter and the defect depth. Therefore, the method disclosed in the present application positively utilizes this feature to accurately detect the defect depth, which is very important information for maintenance and management of piping. Hereinafter, FIG. 3, FIG. 4, and FIG.
The procedure of the pipe inspection method of the present application will be described based on FIG. Here, FIG. 3 shows the flow of the defect state estimation procedure, FIG. 4 shows the relationship between the defect signal width Sw and the defect opening diameter, and FIG. 5 shows the defect signal intensity width using the defect opening diameter as a parameter. The relationship between Sh and defect depth is shown.
【００１３】処理手順を箇条書きする。 〈欠陥深さの推定フロー〉 （イ）図１（ロ）に示すような探傷信号の入力 （ロ）探傷信号処理手段１６ｂによる欠陥信号幅Ｓｗ及
び欠陥信号強度幅Ｓｈの測定処理 ここで、図１（ロ）に示す例の場合は、欠陥信号幅Ｓｗ
として欠陥信号のピークからピークまでの幅（距離のデ
ィメンジョンを備える）が測定され、欠陥信号強度幅Ｓ
ｈとしては、ピークからピークまでの欠陥信号強度幅
（強度のディメンジョンを備える）が、測定処理され
る。 （ハ）推定手段１６ｃによる欠陥信号幅Ｓｗよりの図４
に示す第一関係指標に基づく欠陥の開口径の推定（図４
に一点鎖線の矢印で示す） （ニ）推定手段１６ｃによる欠陥信号強度幅Ｓｈよりの
図５に示す第二関係指標に基づく欠陥深さの推定（図５
に一点鎖線の矢印で示す） この推定過程においては、（ハ）の工程で求められた欠
陥の開口径が利用される。 例えば欠陥信号幅Ｓｗ １．６ 欠陥信号強度幅Ｓｈ ８０ の場合は、 欠陥の開口径 １．５ ｃｍ 欠陥深さ ０．２８ｃｍ と推定される。ここで、第一関係指標、第二関係指標
は、コイルの配置構成、欠陥の一般的な形状、渦電流の
発生状況等により一義的に決まるものであり、この関係
があることは、今般始めて発明者により実験的且つシミ
ュレーション的に確認された。The processing procedure is itemized. <Estimation Flow of Defect Depth> (a) Input of flaw detection signal as shown in FIG. 1 (b) (b) Measurement processing of defect signal width Sw and defect signal strength width Sh by flaw detection signal processing means 16b In the case of the example shown in 1 (b), the defect signal width Sw
The peak-to-peak width of the defect signal (with distance dimension) is measured as
As h, the defect signal intensity width from peak to peak (with intensity dimension) is measured. (C) FIG. 4 from the defect signal width Sw by the estimation means 16c.
Of the opening diameter of the defect based on the first relation index shown in FIG.
(D) is indicated by a dashed-dotted line arrow) (d) Estimation of the defect depth based on the second relation index shown in FIG. 5 from the defect signal intensity width Sh by the estimating means 16c (FIG. 5)
In the estimation process, the opening diameter of the defect obtained in the step (c) is used. For example, in the case of the defect signal width Sw 1.6 and the defect signal intensity width Sh 80, it is estimated that the defect opening diameter is 1.5 cm and the defect depth is 0.28 cm. Here, the first relation index and the second relation index are uniquely determined by the coil arrangement configuration, the general shape of the defect, the eddy current generation state, and the like. It was confirmed experimentally and by simulation by the inventor.
【００１４】〔別実施例〕上記の実施例においては、送
信コイル５の軸芯と配管３の軸芯とを平行に配設し、受
信コイル６の軸芯を配管の軸芯に対して直角に配設する
ことにより、図１（ロ）に示すような、探傷信号形状を
得て、そのピーク、ピーク間の幅を計測することによ
り、欠陥信号幅Ｓｗ及び欠陥信号強度幅Ｓｈを求めた
が、図６（イ）に示すように、受信コイル６０の軸芯を
配管の軸芯に平行に配設する場合は、図６（ロ）に示す
ような探傷信号形状が得られるため、その計測基準とし
て信号の半値部をレファレンスとして、欠陥信号幅Ｓｗ
及び欠陥信号強度幅Ｓｈを求めてもよい。 即ち、管軸
方向の情報の幅と信号強度の幅とを採れれば、本願の方
法を適応することが可能である。[Other Embodiment] In the above embodiment, the axis of the transmitter coil 5 and the axis of the pipe 3 are arranged in parallel, and the axis of the receiver coil 6 is perpendicular to the axis of the pipe. The defect signal width Sw and the defect signal intensity width Sh were obtained by obtaining the flaw detection signal shape as shown in FIG. 1B and measuring the peak and the width between the peaks. However, as shown in FIG. 6A, when the axis of the receiving coil 60 is arranged in parallel with the axis of the pipe, the flaw detection signal shape as shown in FIG. With the half-value portion of the signal as the reference as the measurement reference, the defect signal width Sw
Alternatively, the defect signal intensity width Sh may be obtained. That is, if the width of information and the width of signal strength in the tube axis direction can be taken, the method of the present application can be applied.
【００１５】尚、特許請求の範囲の項に図面との対照を
便利にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.
【図１】測定原理と探傷信号の状態を示す図FIG. 1 is a diagram showing a measurement principle and a state of a flaw detection signal.
【図２】測定装置の構成を示す図FIG. 2 is a diagram showing a configuration of a measuring device.
【図３】欠陥状況の推定手順フロー[Fig. 3] Defect state estimation procedure flow
【図４】欠陥信号信号幅と欠陥の開口径の関係を示す図FIG. 4 is a diagram showing a relationship between a defect signal signal width and a defect opening diameter.
【図５】欠陥信号強度幅と欠陥深さの関係を示す図FIG. 5 is a diagram showing a relationship between a defect signal intensity width and a defect depth.
【図６】別実施例のコイル配置状態と信号状態を示す図FIG. 6 is a diagram showing a coil arrangement state and a signal state of another embodiment.
２ 検知プローブ ３ 配管 ４ 欠陥 ５ 送信コイル ６ 受信コイル １６ａ 記憶手段 １６ｂ 探傷信号処理手段 １６ｃ 推定手段 Ｓｗ 欠陥信号幅 Ｓｈ 欠陥信号強度幅 2 Detection probe 3 Piping 4 Defect 5 Transmission coil 6 Reception coil 16a Storage means 16b Flaw detection signal processing means 16c Estimating means Sw Defect signal width Sh Defect signal strength width
Claims (2)
（５）と受信コイル（６）とを備えた検知フローブ
（２）を導電体の配管（３）内で移動させ、前記送信コ
イル（５）の周部に磁界を発生させるとともに、前記受
信コイル（６）に対する配管部に形成される磁界を前記
受信コイル（６）により検出して、前記配管部に存在す
る欠陥（４）の状況を検出する配管の検査方法におい
て、 前記配管（３）の管軸方向に沿って検出される探傷信号
に於ける欠陥対応信号部の管軸方向での欠陥信号幅（Ｓ
ｗ）と欠陥信号強度幅（Ｓｈ）とを検出し、 前記欠陥信号幅（Ｓｗ）より前記欠陥の開口径を推定す
るとともに、 予め、欠陥の開口径をパラメータとした欠陥信号強度幅
と欠陥深さの関係指標を求めておき、この関係指標を参
照して、前記推定された開口径と前記検出された欠陥信
号強度幅（Ｓｈ）とより欠陥深さを推定する配管の検査
方法。1. A detection probe (2) equipped with a transmission coil (5) and a reception coil (6) at different positions in the longitudinal direction is moved in a conductor pipe (3), and the transmission coil (5) is moved. ), The magnetic field generated in the pipe portion for the receiving coil (6) is detected by the receiving coil (6) and the defect (4) existing in the pipe portion is detected. In the inspection method of the pipe to be detected, the defect signal width (S in the pipe axis direction of the defect corresponding signal portion in the flaw detection signal detected along the pipe axis direction of the pipe (3) (S
w) and the defect signal intensity width (Sh) are detected, the aperture diameter of the defect is estimated from the defect signal width (Sw), and the defect signal intensity width and the defect depth are set in advance using the aperture diameter of the defect as a parameter. A pipe inspection method for estimating a defect depth based on the estimated opening diameter and the detected defect signal intensity width (Sh) with reference to the relation index.
（５）と受信コイル（６）とを有する検知フローブ
（２）を備え、導電体の配管（３）内を移動されるとと
もに、前記送信コイル（５）に磁界を発生させ、前記受
信コイル（６）に対する配管部に形成される磁界を前記
受信コイル（６）により検出して、前記配管部に存在す
る欠陥（４）の状況を検出する配管の検査装置であっ
て、 欠陥の開口径をパラメータとした欠陥信号強度幅と欠陥
深さの関係指標を記憶した記憶手段（１６ａ）を備える
とともに、 前記配管の管軸方向に沿って検出される探傷信号に於け
る欠陥対応信号部の管軸方向での欠陥信号幅（Ｓｗ）と
欠陥信号強度幅（Ｓｈ）とを検出する探傷信号処理手段
（１６ｂ）と、 前記欠陥信号幅（Ｓｗ）より前記欠陥の開口径を推定す
るとともに、前記関係指標を参照して、前記推定された
開口径と前記検出された欠陥信号強度幅（Ｓｈ）とより
欠陥深さを推定する推定手段（１６ｃ）とを備えた配管
の検査装置。2. A detection probe (2) having a transmission coil (5) and a reception coil (6) at different positions in the longitudinal direction is provided, and the detection probe is moved in a conductor pipe (3) and the transmission is performed. A magnetic field is generated in the coil (5), and the magnetic field formed in the pipe portion for the receiving coil (6) is detected by the receiving coil (6) to detect the state of the defect (4) existing in the pipe portion. An inspection apparatus for a pipe, comprising: a storage unit (16a) that stores a relational index between a defect signal intensity width and a defect depth, in which a defect opening diameter is used as a parameter, and detects along the pipe axis direction of the pipe. Flaw detection signal processing means (16b) for detecting a defect signal width (Sw) and a defect signal intensity width (Sh) in the pipe axis direction of the defect corresponding signal portion in the flaw detection signal, and the defect signal width (Sw). ) From the above The inspection of the pipe provided with the estimated opening diameter, the detected defect signal intensity width (Sh), and the estimation means (16c) for estimating the defect depth by referring to the relation index. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4060796A JPH05264512A (en) | 1992-03-18 | 1992-03-18 | Method and device for inspecting piping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4060796A JPH05264512A (en) | 1992-03-18 | 1992-03-18 | Method and device for inspecting piping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05264512A true JPH05264512A (en) | 1993-10-12 |
Family
ID=13152636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4060796A Pending JPH05264512A (en) | 1992-03-18 | 1992-03-18 | Method and device for inspecting piping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05264512A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006208312A (en) * | 2005-01-31 | 2006-08-10 | Jfe Steel Kk | Method and device for measuring internal defect |
| JP2007225564A (en) * | 2006-02-27 | 2007-09-06 | Mitsubishi Heavy Ind Ltd | Method and apparatus for evaluating eddy-current flaw detecting signal |
| JP2010054292A (en) * | 2008-08-27 | 2010-03-11 | Jfe Steel Corp | Method of measuring internal defect |
| JP2012013577A (en) * | 2010-07-01 | 2012-01-19 | Daido Steel Co Ltd | Eddy current flaw detection method |
| JP2016153753A (en) * | 2015-02-20 | 2016-08-25 | 三菱日立パワーシステムズ株式会社 | Pipe flaw detector and pipe flaw detection method |
| CN114923133A (en) * | 2022-06-06 | 2022-08-19 | 国家石油天然气管网集团有限公司 | Internal detector positioning device, method, equipment and medium based on weak magnetic detection |
-
1992
- 1992-03-18 JP JP4060796A patent/JPH05264512A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006208312A (en) * | 2005-01-31 | 2006-08-10 | Jfe Steel Kk | Method and device for measuring internal defect |
| JP2007225564A (en) * | 2006-02-27 | 2007-09-06 | Mitsubishi Heavy Ind Ltd | Method and apparatus for evaluating eddy-current flaw detecting signal |
| JP2010054292A (en) * | 2008-08-27 | 2010-03-11 | Jfe Steel Corp | Method of measuring internal defect |
| JP2012013577A (en) * | 2010-07-01 | 2012-01-19 | Daido Steel Co Ltd | Eddy current flaw detection method |
| JP2016153753A (en) * | 2015-02-20 | 2016-08-25 | 三菱日立パワーシステムズ株式会社 | Pipe flaw detector and pipe flaw detection method |
| CN114923133A (en) * | 2022-06-06 | 2022-08-19 | 国家石油天然气管网集团有限公司 | Internal detector positioning device, method, equipment and medium based on weak magnetic detection |
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