JP3453040B2 - Measuring method of pipe wall thickness and inner wall deposit thickness - Google Patents
Measuring method of pipe wall thickness and inner wall deposit thicknessInfo
- Publication number
- JP3453040B2 JP3453040B2 JP06437297A JP6437297A JP3453040B2 JP 3453040 B2 JP3453040 B2 JP 3453040B2 JP 06437297 A JP06437297 A JP 06437297A JP 6437297 A JP6437297 A JP 6437297A JP 3453040 B2 JP3453040 B2 JP 3453040B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- thickness
- measuring
- wall
- measurement
- 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.)
- Expired - Lifetime
Links
Landscapes
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、加熱炉管等の各種
の配管の肉厚を外部から測定するとともに、それらの管
の内壁に付着したコーキング等の付着物の厚さを測定す
る測定方法に関する。
【０００２】
【背景技術】石油精製工程の加熱炉管等に付着するコー
キング（カーボン、スケール等）のように、各種の管内
壁に付着する付着物は、流体の流速、流量に変動をきた
したり、伝熱（加熱）の支障ともなるため、定期的に除
去する必要がある。この除去作業を効率よく行うために
は、内壁付着物の状態、特に厚さを外部から検知、測定
する必要がある。
【０００３】このような管内の付着物の厚さは、従来、
放射線撮影法により測定していた。すなわち、放射線同
位元素を線源とし、この線源からの放射線を測定管に照
射し、測定管を透過した放射線をフィルムに画像として
写し出し、そのフィルム上から付着物の厚さを算出して
いた。
【０００４】
【発明が解決しようとする課題】しかしながら、この方
法では、フィルム撮影を行うため、フィルムの現像・乾
燥等の処理が必要であり、時間もかかるという問題があ
った。また、フィルム撮影を可能とする放射線の線源強
度は大線量を必要とするため、その取り扱いや被爆管理
が煩雑であるという問題もあった。
【０００５】さらに、フィルム画像では、管の肉厚部や
付着物の部分とそれ以外の部分とは白黒濃度差で表され
るが、その濃淡の差（コントラスト）はそれほど大きく
ないため、目視での判定が難しいという問題もあった。
特に、ある程度一般的な管であれば、管の内周位置を判
定者が見当をつけて判定できるため、コントラストが小
さくても判定できるが、特に厚肉の管や大径の管では、
管の内周位置の見当をつけることができないため、濃度
差を見極めることが難しく、付着物の識別性能が低下し
たり、まったく識別できない場合もあった。
【０００６】また、配管の保温性能や伝熱性能を知るに
は、管の肉厚を測定する必要があるが、従来、管の肉厚
を外部から測定する場合もフィルム撮影を行っていたた
め、同様の問題があり、肉厚を簡易にかつ正確に測定す
る方法が求められていた。
【０００７】一方、測定管を透過した放射線をセンサで
電気信号に変換して付着物の厚さを測定することでフィ
ルム撮影に比べて判別性能を高めたものとして、特公平
３−１９４８４号公報の測定方法が知られている。
【０００８】しかしながら、この測定方法では、管の外
周位置を検出することが難しいため、管の肉厚を測定す
ることが困難であるという問題があった。
【０００９】本発明の目的は、管の肉厚および内壁付着
物厚さを、簡単にかつ正確に測定することができる測定
方法を提供することにある。
【００１０】
【課題を解決するための手段】本発明は、管の肉厚と内
壁付着物の厚さとを同時に測定する測定方法であって、
放射線を発する線源とこの線源からの放射線量を検出す
るセンサとを、測定対象の管を挟んでその管の径方向に
走査し、前記センサで検出した放射線透過線量に基づく
減衰曲線データを測定し、この測定管の減衰曲線データ
の管外周部分と、予め前記測定管と同様に測定した対比
管の減衰データの管外周部分とを重ね合わせた後、前記
測定管の減衰曲線データの最小値および対比管の減衰デ
ータの最小値の差から測定管および対比管の肉厚差を求
め、この肉厚差と既知の対比管の肉厚とから測定管の肉
厚を求めるとともに、前記測定管の減衰曲線データの変
曲点と、測定管の減衰曲線データの最小値とから測定管
の内壁付着物の厚さを求めることを特徴とするものであ
る。
【００１１】このような本発明においては、まず基準と
なる対比管の減衰曲線データを求めておく。すなわち、
線源およびセンサを対比管の径方向に走査して減衰曲線
データを測定する。次に、測定管の減衰曲線データを対
比管と同じ条件で測定する。
【００１２】これらの各管の減衰曲線データは、放射線
が透過する厚さ（透過厚さ）が最大になる管の内壁位置
で極小値を示す。また、測定管および対比管の管外周部
分における放射線の透過厚さはほぼ同じであるため、各
減衰曲線データの管外周部分は一致する。従って、各減
衰曲線データの管外周部分を重ね合わせた後、対比管と
測定管の減衰曲線データの極小値の位置の差を求めるこ
とで、対比管の内壁位置に対する測定管の内壁位置の差
つまり肉厚差が求められ、よって予め測定した対比管の
肉厚に、前記肉厚差を加える（あるいは引く）ことで測
定管の肉厚が求められる。
【００１３】また、減衰曲線データは、放射線の走査
が、内壁付着物の内表面つまり付着物がある部分から無
い部分に移動する際にも、変曲点が生じる。従って、こ
の変曲点の位置から内壁付着物の内表面の位置が求めら
れ、前述の測定管の内壁位置つまり減衰曲線データの極
小値との差から付着物の厚さが求められる。
【００１４】
【発明の実施の形態】以下、本発明の一実施形態を図面
に基づいて説明する。図１には、本実施形態の走査装置
１の構成図が示されている。走査装置１は、測定対象と
なる測定管２を放射線で検査する測定治具１０と、この
測定治具１０で測定したデータを処理する計測器２０
と、計測器２０で処理されたデータを記録するレコーダ
ー３０とを備えている。
【００１５】測定治具１０は、測定管２を挟んで配置さ
れた線源１１およびセンサー１２と、これらの線源１１
およびセンサー１２を測定管２の径方向（図１の矢印方
向）に所定のスピード（例えば５０mm／分）で移動させ
る微動駆動機構１３とを備えている。
【００１６】線源１１としては、例えば、１．４８ＧＢ
ｑの放射能を有するコバルト６０が用いられ、センサー
１２としては、例えば、５mm厚さのシンチレーターと光
電子増倍管とを組み合わせたもの等が用いられている。
そして、線源１１から放射線が出されると、その放射線
は、前記測定管２を通って前記センサー１２で電流値と
して検知され、この電流値が計測器２０に送られるよう
になっている。
【００１７】計測器２０には、前記センサー１２からの
電流値のほかに、微動駆動機構１３からの線源１１、セ
ンサー１２の移動距離を表す信号が入力される。そし
て、計測器２０では、それらのデータに基づいて演算を
実施し、レコーダー３０に放射線が透過した厚さと管２
の密度に比例した信号を出力し、図２に示すような減衰
曲線データのチャートを記録させる。
【００１８】次に、このような本実施形態における測定
手順について説明する。まず、測定管２および対比管３
を、線源１１、センサー１２で測定して減衰曲線データ
をレコーダー３０で記録する。対比管３は、測定管２と
同材質で構成された管であり、その肉厚は予め測定して
既知であり、また、その内周面にはコーキング等の付着
物は付着していないものである。
【００１９】そして、レコーダー３０で記録された（記
録紙に印字された）測定管２および対比管３の減衰曲線
データａ，ｂを、図２に示すように重ねる。この際、図
２の管２，３の断面部分に示すように、測定管２および
対比管３の管外周部分における放射線の透過厚さはほぼ
同じであるため、各減衰曲線データａ，ｂの測定開始部
分（図２のｃの部分）は一致する。従って、各減衰曲線
データａ，ｂのｃの部分を重ね合わせる。
【００２０】次に、測定管２、対比管３の内壁位置を決
める。各内壁位置は、減衰曲線データａ，ｂにおける最
小値（つまり透過厚さの最大値）であるから、図２の
の位置を測定管２の内壁位置（ＷＳＩ）に、の位置を
対比管３の内壁位置（ＷＲＩ）に決める。
【００２１】また、測定管２の内壁に付着したコーキン
グ４の内周面は、減衰曲線データａの変曲点として表さ
れるから、図２のの位置をコーキング４の変曲点（Ｔ
ＦＰ）つまりコーキング４の内周面の位置に決める。
【００２２】以上のデータから、測定管２の肉厚および
コーキング付着厚さ（カーボン付着厚さ）を求める。測
定管２の肉厚を求めるには、まず、測定管２と対比管３
の肉厚差（Δｔ）を数式１によって求める。
【００２３】
【数１】Δｔ＝ＷＲＩ−ＷＳＩ
【００２４】次に、測定管２の肉厚（図２のｔx ）を
求める。対比管３の肉厚（図２のｔR ）は既知である
から、肉厚差（Δｔ）と対比管３の肉厚（ｔR ）か
ら測定管２の肉厚（ｔx ）を数式２によって求める。
【００２５】
【数２】ｔx ＝（ｔR −Δｔ）
【００２６】さらに、コーキング４の付着厚さｔc を
求める。コーキング厚さ（ｔc ）は、先に決めたコーキ
ング４による変曲点（ＴＦＰ）と測定管２の内壁位置
（ＷＳＩ）から数式３で求める。
【００２７】
【数３】ｔc ＝（ＴＦＰ−ＷＳＩ）
【００２８】このような本実施形態によれば、センサー
１２で検出した放射線透過量から算出した減衰曲線デー
タａ，ｂに基づいて測定管２の肉厚（ｔx ）やコーキン
グ厚さ（ｔc ）を求めているので、従来のフィルム撮影
による測定に比べて作業を簡単にでき、迅速にかつ定量
的に測定することができる。
【００２９】また、線源１１は、フィルム撮影用の線源
と比較して線源強度を小さくできる。例えば、本実施形
態のコバルト６０を用いた線源１１は、撮影用線源と比
較して１／１４０の線源強度のものが利用でき、線源強
度を大幅に小さくできて取り扱いや被爆管理を容易に行
うことができる。
【００３０】さらに、本実施形態では、センサー１２で
検出した放射線透過量を電気信号処理しており、変曲点
の存在を明確にできるため、目視で判定する放射線撮影
法に比べて、測定管２の肉厚が厚い場合や大径の場合で
も、コーキング付着を確実に識別できてその付着厚さを
測定することができる。
【００３１】また、測定管２の減衰曲線データａを、対
比管３のデータｂと比較しているため、コーキング付着
厚さだけでなく、測定管２の肉厚も測定することができ
る。さらに、データａ，ｂを対比しているため、コーキ
ング付着量が僅かであっても、その変曲点を容易に見い
だすことができ、そのコーキング付着厚さを測定するこ
とができる。その上、例えば、測定管２の材質や比重が
不明な場合でも、測定管２と同じ材質の対比管３を用い
ることで測定が可能となるため、様々な管を簡単に測定
することができる。
【００３２】さらに、測定管２の肉厚およびコーキング
付着厚さを同時に測定することができるため、測定効率
を向上することができる。
【００３３】なお、本発明は前述の実施形態に限定され
るものではなく、本発明の目的を達成できる範囲での変
形、改良等は本発明に含まれるものである。
【００３４】例えば、前記実施形態では、センサー１２
で検出された信号を計測器２０で演算し、レコーダー３
０に記録させていたが、例えば、センサー１２からの信
号をコンピュータ等に入力し、コンピュータ内で入力デ
ータを処理して各内壁位置（ＷＳＩ、ＷＲＩ）や変曲点
（ＴＦＰ）を求め、さらに各数式１〜３の演算を行って
測定管の肉厚（ｔx ）やコーキング厚さ（ｔc ）を求め
るようにしてもよい。
【００３５】また、前記実施形態では、放射線の走査方
向が測定管１の一方向（上下方向）について行った場合
について説明したが、例えばそれと直交する方向（左右
方向）についても走査すれば、測定管２におけるコーキ
ング４の付着状態をより正確に測定することができる。
【００３６】さらに、前記実施形態では、放射線の走査
に伴い、放射線透過量のデータを連続的に採取していた
が、一定間隔（寸法あるいは時間）でデータを採取して
処理してもよい。
【００３７】また、対比管３としては、測定管２と材質
が同一のものに限らず、例えば一般的な炭素鋼とステン
レス鋼（ＳＵＳ３０４）のように、放射線の透過量がほ
ぼ同程度のものであれば利用することができる。さら
に、測定管２や対比管３に用いた各材質の放射線の吸収
係数等が分かっている場合には、測定管２と対比管３と
で放射線の透過量が大きく異なる材質を用いることも可
能である。
【００３８】さらに、測定管２と対比管３との口径や肉
厚は、前記実施形態のように同一のものでなくてもよい
が、同一であれば、対比管３の内壁位置に対する測定管
２の内壁位置の差をそのまま配管減肉量として測定する
ことができる。
【００３９】
【実施例】次に、図１に示す実施形態において、本発明
の有用性を確認するために行った実験例について説明す
る。
【００４０】実験は、実機のチューブ（測定管２）をサ
ンプリングしてコーキング付着が目視で観察できる状態
で行った。この実験によってレコーダー３０に記録され
たチャートを図３に示す。このチャートに基づいて、測
定管２の肉厚およびコーキング厚さを求めたところ、目
視で測定したデータとほぼ一致し、本発明の有用性が確
認できた。
【００４１】
【発明の効果】このような本発明の測定方法によれば、
管の肉厚および内壁付着物厚さを簡単にかつ正確に測定
することができるという効果がある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the thickness of various pipes such as heating furnace tubes from the outside, and for measuring the thickness of caulk or the like adhered to the inner walls of the pipes. The present invention relates to a measuring method for measuring the thickness of a deposit. 2. Description of the Related Art Deposits adhering to various pipe inner walls, such as caulking (carbon, scale, etc.) adhering to a heating furnace tube or the like in a petroleum refining process, cause fluctuations in the flow velocity and flow rate of a fluid. In addition, heat transfer (heating) may be hindered, so it is necessary to periodically remove the heat. In order to perform this removal operation efficiently, it is necessary to externally detect and measure the state of the deposits on the inner wall, particularly the thickness. [0003] Conventionally, the thickness of the deposits in the tube is conventionally
It was measured by radiography. That is, a radiation isotope was used as a radiation source, radiation from the radiation source was irradiated to a measurement tube, radiation transmitted through the measurement tube was projected as an image on a film, and the thickness of the attached matter was calculated from the film. . [0004] However, in this method, there is a problem that processing such as development and drying of the film is required for photographing the film, which takes time. In addition, since the radiation source intensity required for film photography requires a large dose, there is also a problem that handling and exposure management are complicated. Further, in the film image, the thick portion of the tube or the portion of the attached matter and the other portion are represented by a black and white density difference, but the difference in the density (contrast) is not so large, so that it is visually observed. There was also a problem that determination of was difficult.
In particular, in the case of a somewhat general tube, since the judge can determine the inner circumferential position of the tube by making an aim, it can be determined even if the contrast is small, but especially in a thick tube or a large diameter tube,
Since it was not possible to determine the position of the inner circumference of the tube, it was difficult to determine the difference in concentration. Further, in order to know the heat insulation performance and heat transfer performance of a pipe, it is necessary to measure the wall thickness of the pipe. Conventionally, when measuring the wall thickness of a pipe from outside, film photography has been performed. There is a similar problem, and a method for simply and accurately measuring the wall thickness has been required. On the other hand, Japanese Patent Publication No. Hei 3-19484 discloses a technique in which radiation transmitted through a measuring tube is converted into an electric signal by a sensor to measure the thickness of an attached substance, thereby improving the discrimination performance as compared with film photography. Is known. However, this measuring method has a problem that it is difficult to detect the outer peripheral position of the pipe, and thus it is difficult to measure the wall thickness of the pipe. An object of the present invention is to provide a measuring method capable of easily and accurately measuring the wall thickness of a pipe and the thickness of an adhered substance on an inner wall. [0010] The present invention is a measuring method for simultaneously measuring the thickness of a pipe and the thickness of a deposit on an inner wall,
A radiation source that emits radiation and a sensor that detects the amount of radiation from this radiation source are scanned in the radial direction of the tube to be measured, and attenuation curve data based on the radiation transmitted dose detected by the sensor is obtained. measured, and Kangaishu portion of the attenuation curve data of the measuring tube, after superposing the Kangaishu portion of attenuation data in advance the measuring tube and contrasted tube as measured in the same manner, the minimum decay curve data of the measuring tube The thickness difference between the measurement tube and the comparison tube is determined from the difference between the measured value and the minimum value of the attenuation data of the comparison tube, and the thickness of the measurement tube is determined from the thickness difference and the thickness of the known comparison tube, and the measurement is performed. The thickness of the deposit on the inner wall of the measuring tube is obtained from the inflection point of the damping curve data of the tube and the minimum value of the damping curve data of the measuring tube. In the present invention, first, attenuation curve data of a reference tube serving as a reference is obtained. That is,
The attenuation curve data is measured by scanning the source and the sensor in the radial direction of the contrast tube. Next, the attenuation curve data of the measuring tube is measured under the same conditions as those of the comparison tube. The attenuation curve data of each of these tubes shows a minimum value at the inner wall position of the tube where the thickness (transmission thickness) through which the radiation passes is maximum. In addition, since the transmission thickness of radiation in the outer peripheral portions of the measurement tube and the comparison tube is substantially the same, the outer peripheral portions of the respective attenuation curve data match. Therefore, after superimposing the pipe outer peripheral portion of each attenuation curve data, the difference between the positions of the minimum values of the attenuation curve data of the comparison pipe and the measurement pipe is obtained, whereby the difference of the inner wall position of the measurement pipe with respect to the inner wall position of the comparison pipe is obtained. That is, the thickness difference is obtained, and thus the thickness of the measuring tube is obtained by adding (or subtracting) the thickness difference to the thickness of the comparison tube measured in advance. In the attenuation curve data, an inflection point is also generated when the radiation scanning moves from the inner surface of the inner wall deposits, that is, the portion where the deposits do not exist to the portion where the deposits do not exist. Therefore, the position of the inner surface of the deposit on the inner wall is determined from the position of the inflection point, and the thickness of the deposit is determined from the difference between the inner wall position of the measurement tube, that is, the minimum value of the attenuation curve data. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration diagram of a scanning device 1 of the present embodiment. The scanning device 1 includes a measuring jig 10 for inspecting a measuring tube 2 to be measured with radiation, and a measuring device 20 for processing data measured by the measuring jig 10.
And a recorder 30 for recording data processed by the measuring device 20. The measuring jig 10 comprises a radiation source 11 and a sensor 12 which are arranged with the measuring tube 2 interposed therebetween,
And a fine drive mechanism 13 for moving the sensor 12 at a predetermined speed (for example, 50 mm / min) in the radial direction of the measuring tube 2 (the direction of the arrow in FIG. 1). As the radiation source 11, for example, 1.48 GB
Cobalt 60 having q radioactivity is used. As the sensor 12, for example, a combination of a 5 mm-thick scintillator and a photomultiplier tube is used.
When radiation is emitted from the radiation source 11, the radiation is detected as a current value by the sensor 12 through the measuring tube 2, and the current value is sent to the measuring device 20. In addition to the current value from the sensor 12, a signal indicating the moving distance of the radiation source 11 and the sensor 12 from the fine movement driving mechanism 13 is input to the measuring device 20. Then, the measuring device 20 performs an operation based on the data, and determines the thickness of the radiation transmitted through the recorder 30 and the thickness of the tube 2.
And outputs a signal proportional to the density, and records a chart of attenuation curve data as shown in FIG. Next, the measurement procedure in this embodiment will be described. First, the measurement tube 2 and the comparison tube 3
Is measured by the radiation source 11 and the sensor 12, and the attenuation curve data is recorded by the recorder 30. The comparison tube 3 is a tube made of the same material as the measurement tube 2, and its thickness is measured in advance and is known, and no adhering matter such as caulking adheres to the inner peripheral surface thereof. It is. Then, the attenuation curve data a and b of the measurement tube 2 and the comparison tube 3 recorded (printed on the recording paper) by the recorder 30 are superimposed as shown in FIG. At this time, as shown in the cross-sectional portions of the tubes 2 and 3 in FIG. 2, the transmission thicknesses of radiation in the outer peripheral portions of the measurement tube 2 and the comparison tube 3 are almost the same. The measurement start portion (portion c in FIG. 2) coincides. Therefore, the portions c of the respective attenuation curve data a and b are superimposed. Next, the inner wall positions of the measurement tube 2 and the comparison tube 3 are determined. Since each inner wall position is the minimum value (that is, the maximum value of the transmission thickness) in the attenuation curve data a and b, the position of FIG. 2 is set to the inner wall position (WSI) of the measurement tube 2 and the position of the comparison tube 3 is set. To the inner wall position (WRI). Since the inner peripheral surface of the caulking 4 attached to the inner wall of the measuring tube 2 is represented as an inflection point of the attenuation curve data a, the position shown in FIG.
FP), that is, the position of the inner peripheral surface of the caulking 4. From the above data, the thickness of the measuring tube 2 and the thickness of the caulking (carbon adhesion) are determined. To determine the thickness of the measuring tube 2, first, the measuring tube 2 and the contrasting tube 3
Is obtained by Equation (1). ## EQU1 ## Next, the thickness of the measuring tube 2 (t x in FIG. 2) is determined. Since the thickness of the comparison tube 3 (t R in FIG. 2) is known, the thickness (t x ) of the measurement tube 2 is calculated from the thickness difference (Δt) and the thickness (t R ) of the comparison tube 3 according to Equation 2. Ask by. [0025] [Equation 2 t x = (t R -Δt) Furthermore, determining the thickness t c adhesion of coking 4. The coking thickness (t c ) is obtained by Equation 3 from the inflection point (TFP) determined by the coking 4 and the inner wall position (WSI) of the measuring tube 2. [0027] Equation 3] t c = (TFP-WSI) According to the present embodiment, the decay curve data a calculated from the amount of transmitted radiation detected by the sensor 12, the measuring tube based on the b Since the thickness (t x ) and caulking thickness (t c ) of No. 2 are obtained, the operation can be simplified, and the measurement can be performed quickly and quantitatively as compared with the conventional measurement by film photography. Further, the source 11 can reduce the source intensity as compared with the source for film photography. For example, as the radiation source 11 using the cobalt 60 of the present embodiment, a radiation source having a source intensity of 1/140 as compared with the radiography source can be used, and the radiation source intensity can be significantly reduced. Can be easily performed. Further, in the present embodiment, the radiation transmission amount detected by the sensor 12 is subjected to an electric signal processing, and the existence of an inflection point can be clarified. Even when the thickness of 2 is large or the diameter is large, it is possible to reliably identify the adhesion of caulking and measure the thickness of the adhesion. Further, since the attenuation curve data a of the measuring tube 2 is compared with the data b of the comparison tube 3, not only the thickness of the caulking adhesion but also the thickness of the measuring tube 2 can be measured. Further, since the data a and b are compared, even if the amount of coking is small, the inflection point can be easily found, and the thickness of the coking can be measured. In addition, for example, even when the material and specific gravity of the measurement tube 2 are unknown, the measurement can be performed by using the comparison tube 3 of the same material as the measurement tube 2, so that various tubes can be easily measured. . Further, since the thickness of the measuring tube 2 and the thickness of the caulking adhesion can be measured simultaneously, the measuring efficiency can be improved. The present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved. For example, in the above embodiment, the sensor 12
Is calculated by the measuring device 20 and the recorder 3
However, for example, a signal from the sensor 12 is input to a computer or the like, and the input data is processed in the computer to obtain each inner wall position (WSI, WRI) and an inflection point (TFP). The wall thickness (t x ) and the caulking thickness (t c ) of the measuring tube may be obtained by performing the calculations of the equations (1) to ( 3 ). In the above embodiment, the case where the scanning direction of the radiation is performed in one direction (vertical direction) of the measuring tube 1 has been described. The adhesion state of the caulking 4 on the tube 2 can be measured more accurately. Further, in the above-described embodiment, the radiation transmission data is continuously collected in accordance with the radiation scanning. However, the data may be collected and processed at regular intervals (dimensions or time). Further, the comparison tube 3 is not limited to the one having the same material as that of the measurement tube 2 and, for example, one having a radiation transmission amount substantially equal to that of a general carbon steel and stainless steel (SUS304). If it can be used. Furthermore, if the radiation absorption coefficient of each material used for the measurement tube 2 and the comparison tube 3 is known, it is possible to use a material that has a significantly different amount of radiation transmission between the measurement tube 2 and the comparison tube 3. It is. Further, the diameter and thickness of the measuring tube 2 and the comparison tube 3 may not be the same as in the above embodiment, but if they are the same, the measurement tube with respect to the inner wall position of the comparison tube 3 The difference between the inner wall positions in No. 2 can be directly measured as the pipe wall thinning amount. Next, a description will be given of an experimental example performed to confirm the usefulness of the present invention in the embodiment shown in FIG. The experiment was performed in a state where the tube of the actual machine (measuring tube 2) was sampled and the adhesion of caulking could be visually observed. FIG. 3 shows a chart recorded in the recorder 30 by this experiment. When the thickness and caulking thickness of the measuring tube 2 were determined based on this chart, they almost agreed with the data measured visually, confirming the usefulness of the present invention. According to the measuring method of the present invention,
There is an effect that the thickness of the pipe and the thickness of the deposit on the inner wall can be easily and accurately measured.
【図面の簡単な説明】
【図１】本発明の一実施形態の構成図である。
【図２】本実施形態における測定部位と測定によってレ
コーダーに記録されたデータとの対比図である。
【図３】本発明の実験データを示すグラフである。
【符号の説明】
１ 走査装置
２ 測定管
３ 対比管
４ コーキング
１０ 測定治具
１１ 線源
１２ センサー
１３ 微動駆動機構
２０ 計測器
３０ レコーダーBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an embodiment of the present invention. FIG. 2 is a comparison diagram of a measurement site and data recorded on a recorder by measurement in the present embodiment. FIG. 3 is a graph showing experimental data of the present invention. [Description of Signs] 1 Scanning device 2 Measuring tube 3 Contrast tube 4 Caulking 10 Measuring jig 11 Radiation source 12 Sensor 13 Fine movement drive mechanism 20 Measuring device 30 Recorder
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−277542（ＪＰ，Ａ) 特開 平４−151505（ＪＰ，Ａ) 特開 昭53−68266（ＪＰ，Ａ) 特開 平３−148006（ＪＰ，Ａ) 児玉潔、外３名，“γ線透過法による 地熱発電所熱水配管のシリカスケール測 定”，非破壊検査，社団法人日本非破壊 検査協会，1989年 ９月，第38巻，第９ Ａ号，ｐ．797−798 (58)調査した分野(Int.Cl.7，ＤＢ名) G01B 15/00 - 15/08 G01N 23/00 - 23/227 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-277542 (JP, A) JP-A-4-151505 (JP, A) JP-A-53-68266 (JP, A) 148006 (JP, A) Kiyoshi Kodama and three others, “Silica scale measurement of hot water piping of geothermal power plants by gamma ray transmission method”, Nondestructive inspection, Japan Nondestructive Inspection Association, September 1989, No. 38, No. 9A, p. 797-798 (58) Field surveyed (Int.Cl. 7 , DB name) G01B 15/00-15/08 G01N 23/00-23/227
Claims (1)
測定する測定方法であって、 放射線を発する線源とこの線源からの放射線量を検出す
るセンサとを、測定対象の管を挟んでその管の径方向に
走査し、前記センサで検出した放射線透過線量に基づく
減衰曲線データを求め、 この測定管の減衰曲線データの管外周部分と、予め測定
した対比管の減衰データの管外周部分とを重ね合わせた
後、 前記測定管の減衰曲線データの最小値および対比管の減
衰データの最小値の差から測定管および対比管の肉厚差
を求め、この肉厚差と既知の対比管の肉厚とから測定管
の肉厚を求めるとともに、 前記測定管の減衰曲線データの変曲点と、測定管の減衰
曲線データの最小値とから測定管の内壁付着物の厚さを
求めることを特徴とする管の肉厚および内壁付着物厚さ
の測定方法。(57) [Claims 1] A measuring method for simultaneously measuring the thickness of a tube and the thickness of a substance attached to an inner wall, wherein a radiation source emitting radiation and a radiation dose from the radiation source are detected. And a sensor to be scanned in the radial direction of the tube to be measured with the tube to be measured interposed therebetween, to obtain attenuation curve data based on the radiation transmission dose detected by the sensor, and a pipe outer peripheral portion of the attenuation curve data of the measurement tube, After superimposing the outer circumference portion of the attenuation data of the comparison tube measured in advance, the thickness difference between the measurement tube and the comparison tube is obtained from the difference between the minimum value of the attenuation curve data of the measurement tube and the minimum value of the attenuation data of the comparison tube. And determine the thickness of the measurement tube from this thickness difference and the known thickness of the comparison tube.From the inflection point of the attenuation curve data of the measurement tube and the minimum value of the attenuation curve data of the measurement tube, The feature is to determine the thickness of the deposit on the inner wall of the measuring tube. Method for measuring the thickness of the pipe and the thickness of deposits on the inner wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06437297A JP3453040B2 (en) | 1997-03-18 | 1997-03-18 | Measuring method of pipe wall thickness and inner wall deposit thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06437297A JP3453040B2 (en) | 1997-03-18 | 1997-03-18 | Measuring method of pipe wall thickness and inner wall deposit thickness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10260029A JPH10260029A (en) | 1998-09-29 |
| JP3453040B2 true JP3453040B2 (en) | 2003-10-06 |
Family
ID=13256404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06437297A Expired - Lifetime JP3453040B2 (en) | 1997-03-18 | 1997-03-18 | Measuring method of pipe wall thickness and inner wall deposit thickness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3453040B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5970300B2 (en) * | 2012-08-30 | 2016-08-17 | 国立大学法人神戸大学 | Method and apparatus for detecting thickness of coking in heating tube |
| JP7358291B2 (en) * | 2020-04-07 | 2023-10-10 | Ｊｆｅエンジニアリング株式会社 | Method and device for estimating the thickness of deposits on the inner wall surface of the exhaust gas passage |
| JP7358290B2 (en) * | 2020-04-07 | 2023-10-10 | Ｊｆｅエンジニアリング株式会社 | Method and device for estimating the thickness of deposits on the inner wall surface of the exhaust gas passage |
-
1997
- 1997-03-18 JP JP06437297A patent/JP3453040B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 児玉潔、外３名，"γ線透過法による地熱発電所熱水配管のシリカスケール測定"，非破壊検査，社団法人日本非破壊検査協会，１９８９年 ９月，第３８巻，第９Ａ号，ｐ．７９７−７９８ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10260029A (en) | 1998-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6925145B2 (en) | High speed digital radiographic inspection of piping | |
| US5864601A (en) | Method and apparatus for inspecting pipes using a digitized radiograph | |
| JPS61120950A (en) | Inspection for inside of piping | |
| JPH0224339B2 (en) | ||
| CN108333195A (en) | A method of it is used to detect pipeline wall thickness and whether pipeline corrodes | |
| JP3453040B2 (en) | Measuring method of pipe wall thickness and inner wall deposit thickness | |
| JP3079920B2 (en) | Defect inspection method for painted covering materials | |
| JP2653532B2 (en) | Surface defect inspection equipment | |
| JP3650063B2 (en) | Heat transfer tube inspection device | |
| US2957987A (en) | Method of determining metal thickness, scaling, and deposits in piping | |
| JP3487750B2 (en) | Method and apparatus for measuring thickness of deposits on inner wall of pipe | |
| JP3219565B2 (en) | Defect depth position detection apparatus and method | |
| JP2002277448A (en) | Scale thickness measuring apparatus and method | |
| JP4638952B2 (en) | Refractory thickness measuring method and apparatus | |
| JPH1090415A (en) | Method for measuring contamination distribution in radioactive-contaminated pipe | |
| CN107727671A (en) | A kind of lack of penetration detecting system of pressure pipeline ray digital imaging | |
| Chowdhury et al. | Utilization and Validation of Tangential Radiographic Technique in Wall Thickness Measurement of Insulated Pipes in Moulovi Bazar Gas Processing Plant | |
| JPH09229655A (en) | Inspection method for pipeline and inspection apparatus therefor | |
| JP4088455B2 (en) | Method and apparatus for measuring thickness of multi-layer material | |
| JPS61204510A (en) | Method for measuring thickness of deposit layer on inside of pipe utilizing neutron | |
| JP4906561B2 (en) | In-pipe deposit diagnosis method | |
| JPS5995445A (en) | Measurement device for deposit on inside wall | |
| JPH03148006A (en) | Thickness measuring method of duplex pipe of different materials | |
| JPH10141935A (en) | Method for estimating eroded depth of pipe | |
| JPH0319484B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20030617 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070718 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080718 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090718 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100718 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100718 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110718 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110718 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120718 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130718 Year of fee payment: 10 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |