JP2006284416A - Pipe thinning prediction device and method - Google Patents

Pipe thinning prediction device and method Download PDF

Info

Publication number
JP2006284416A
JP2006284416A JP2005106012A JP2005106012A JP2006284416A JP 2006284416 A JP2006284416 A JP 2006284416A JP 2005106012 A JP2005106012 A JP 2005106012A JP 2005106012 A JP2005106012 A JP 2005106012A JP 2006284416 A JP2006284416 A JP 2006284416A
Authority
JP
Japan
Prior art keywords
pipe
temperature
thinning
fluid
partially
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.)
Granted
Application number
JP2005106012A
Other languages
Japanese (ja)
Other versions
JP4579749B2 (en
Inventor
Hiroichi Ikeda
博一 池田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Power Technology Ltd
Original Assignee
Toden Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toden Kogyo Co Ltd filed Critical Toden Kogyo Co Ltd
Priority to JP2005106012A priority Critical patent/JP4579749B2/en
Publication of JP2006284416A publication Critical patent/JP2006284416A/en
Application granted granted Critical
Publication of JP4579749B2 publication Critical patent/JP4579749B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe thinning prediction device, prediction method, and a pipe thinning prediction program capable of predicting the thickness or the thinning state of a pipe simply with actually sufficient accuracy without requiring complicated heat transfer analysis. <P>SOLUTION: This device has a heater 4 for heating the pipe 2 in the state where a fluid 1 flows inside; a heater control means 6 for heating the pipe 2 partially or wholly up to at least the first set temperature exceeding the fluid 1 temperature by controlling the heater 4; a temperature sensor 5 for detecting the partial or whole temperature of the pipe 2; and a prediction means 8 for predicting the thinning state of the pipe 2, based on a partial or whole temperature change of the pipe 2 detected by the temperature sensor 5, when heating is finished after the pipe 2 reaches the the first set temperature partially or wholly, and the pipe is cooled by the fluid 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、発電プラント等に存在する配管の減肉測定に用いられる、配管減肉予測装置及び予測方法、並びに配管減肉予測プログラムに関する。   The present invention relates to a pipe thinning prediction apparatus and prediction method, and a pipe thinning prediction program used for pipe thinning measurement in a power plant or the like.

従来、プラントにおいて、配管の肉厚を測定する方法は以下のとおりである。プラントを停止させて、配管内部に流体が存在しない状態にし、或いはその流れを停止させた状態で、配管を覆っている保温材を外して、配管表面に超音波探触子を接触させ、超音波を配管表面から入射させて、配管内面で反射した波を検出し、超音波を発信してから配管内面で反射した超音波を受信するまでの時間から、超音波を発信した方向における配管の肉厚を測定する。   Conventionally, a method for measuring the thickness of a pipe in a plant is as follows. Stop the plant so that there is no fluid inside the pipe, or with the flow stopped, remove the heat insulating material that covers the pipe and bring the ultrasonic probe into contact with the pipe surface. The sound wave is incident from the pipe surface, the wave reflected on the inner surface of the pipe is detected, and the time from the transmission of the ultrasonic wave to the reception of the ultrasonic wave reflected on the inner surface of the pipe in the direction in which the ultrasonic wave is transmitted Measure wall thickness.

また、特許文献1には、「加熱コイルと温度制御装置と肉厚測定対象配管部の温度分布を測定する装置と温度分布を数値化してデータとして取り込むコンピュータと伝熱解析デーベースを基にして最適値を計算するプログラムを有するコンピュータにより、配管肉厚測定装置を構成する」ことが提案されている。   In addition, Patent Document 1 describes, “Based on a heating coil, a temperature control device, a device for measuring the temperature distribution of the thickness measurement pipe, a computer for digitizing the temperature distribution and importing it as data, and a heat transfer analysis database. It is proposed that a pipe wall thickness measuring device is constituted by a computer having a program for calculating an optimum value.

特許文献1の実施の形態においては、配管を加熱後に「大気中自然徐冷」して、「サーモグラフィー」を用いて配管の温度分布を測定する手法と、配管を加熱後に「クーラを用いて、強制除冷する手法」と、が開示されている。   In the embodiment of Patent Document 1, after the pipe is heated, “natural cooling in the atmosphere”, a method of measuring the temperature distribution of the pipe using “thermography”, and after the pipe is heated, “using a cooler, "Method for forced cooling" is disclosed.

特開2000−161943(要約、段落0019、段落0027)JP2000-161943 (Abstract, paragraph 0019, paragraph 0027)

上記した従来の超音波を用いた配管肉厚測定方法によれば、プラントを停止させて、配管内部に流体がない状態で、測定を行う必要があるという問題がある。また、この方法によれば、超音波を発信した方向しか、配管の肉厚を測定できないため、配管全体を測定するには、膨大な測定箇所が必要になるという問題がある。さらに、この方法によれば、超音波探触子を配管表面に接触させる必要があるため、通常、配管を覆っている保温材を取り外さなければならないという問題がある。   According to the above-described conventional pipe wall thickness measurement method using ultrasonic waves, there is a problem that it is necessary to stop the plant and perform measurement in a state where there is no fluid inside the pipe. Further, according to this method, since the thickness of the pipe can be measured only in the direction in which the ultrasonic wave is transmitted, there is a problem that an enormous number of measurement points are required to measure the entire pipe. Furthermore, according to this method, since it is necessary to bring the ultrasonic probe into contact with the pipe surface, there is a problem that the heat insulating material covering the pipe usually has to be removed.

また、特許文献1の発明のように、配管を外部から冷却した際の温度分布の変化を測定する場合には、プラントを停止させ配管を覆っている保温材を剥がして加熱コイル等を取り付ける手間が掛かるという問題と、配管肉厚の差による温度分布の変化が小さいため、厳密な温度変化の測定が求められること、加えて複雑な解析が必要となるという問題とがある。   In addition, as in the invention of Patent Document 1, when measuring a change in temperature distribution when a pipe is cooled from the outside, it is troublesome to stop the plant, peel off the heat insulating material covering the pipe, and attach a heating coil or the like In addition, there is a problem that a change in temperature distribution due to a difference in pipe wall thickness is small, so that a strict temperature change measurement is required, and a complicated analysis is required.

本発明の目的は、複雑な伝熱解析を要せずに、実用上十分な精度で簡便に配管の肉厚ないし減肉状態を予測することができる配管減肉予測装置及び予測方法、配管減肉予測プログラムを提供することである。   SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe thinning prediction apparatus and prediction method capable of easily predicting the thickness or thinning state of pipes with sufficient accuracy for practical use without requiring complicated heat transfer analysis, and pipe reduction. It is to provide a meat prediction program.

本発明は、第1の視点において、その内部を流体が流れている状態の配管を加熱するヒーターと、前記ヒーターを制御して前記配管を部分的又は全体的に少なくとも前記流体の温度を超える第1の設定温度に加熱するヒータ制御手段と、前記配管の部分的又は全体的な温度を検出する温度センサーと、前記配管が部分的又は全体的に前記第1の設定温度に到達後、前記加熱が終了され、前記流体により該配管が冷却されていく際に、前記温度センサーにより検出される該配管の部分的又は全体的な温度変化に基づいて、該配管の減肉状態を予測する予測手段と、を有する、ことを特徴とする配管減肉予測装置を提供する。   According to a first aspect of the present invention, there is provided a heater that heats a pipe in a state where a fluid flows therein, and a heater that controls the heater to partially or totally exceed at least the temperature of the fluid. A heater control means for heating to a set temperature of 1, a temperature sensor for detecting a partial or total temperature of the pipe, and the heating after the pipe reaches the first set temperature partially or entirely. When the pipe is cooled by the fluid, a predicting means for predicting a thinning state of the pipe based on a partial or total temperature change of the pipe detected by the temperature sensor A pipe thinning prediction apparatus characterized by comprising:

本発明は、第2の視点において、その内部を流体が流れている状態の配管を部分的又は全体的に前記流体温度を超える第1の設定温度に加熱する工程と、前記配管が部分的又は全体的に前記第1の設定温度に到達後、前記加熱を終了し、前記流体により該配管を冷却させる工程と、前記流体により該配管を冷却させる前記工程において、前記配管の部分的又は全体的な温度変化を測定する工程と、前記温度変化に基づいて前記配管の減肉状態を予測する工程と、を含む、ことを特徴とする配管減肉予測方法を提供する。   According to a second aspect of the present invention, in the second aspect, a step of heating a pipe in a state where a fluid flows therein partially or entirely to a first set temperature exceeding the fluid temperature, and the pipe is partially or After reaching the first set temperature as a whole, the heating is terminated, and the pipe is cooled by the fluid, and the pipe is cooled by the fluid. There is provided a pipe thinning prediction method characterized by including a step of measuring a simple temperature change and a step of predicting a thinning state of the pipe based on the temperature change.

本発明は、第3の視点において、その内部を流体が流れている状態の配管が部分的又は全体的に該流体温度を超える第1の設定温度に加熱され、該配管が部分的又は全体的に該第1の設定温度に到達後、該加熱が終了され、該流体により該配管が冷却される際、該冷却時における前記配管の部分的又は全体的な温度変化が測定される配管減肉予測方法において、前記配管が部分的又は全体的に減肉していない場合の前記温度変化と、測定された前記配管の部分的又は全体的な前記温度変化とを比較する手順と、前記比較結果に基づいて、該配管の減肉状態を予測する手順と、をコンピュータに実行させることを特徴とする配管減肉予測プログラムを提供する。   According to a third aspect of the present invention, in a third aspect, a pipe in a state in which a fluid flows therein is partially or entirely heated to a first set temperature that exceeds the fluid temperature, and the pipe is partially or entirely After the first set temperature is reached, when the heating is terminated and the pipe is cooled by the fluid, a pipe wall thinning in which a partial or total temperature change of the pipe during the cooling is measured In the prediction method, a procedure for comparing the temperature change when the pipe is not partially or totally thinned with the measured partial or total temperature change of the pipe, and the comparison result A pipe thinning prediction program characterized by causing a computer to execute a procedure for predicting a thinning state of the pipe based on the above.

本発明によれば、大気側ではなく、配管内部を流れる流体の方に、配管を加熱した熱を移動させることから、配管単位面積・単位時間当たりの熱移動量が大きいため、配管減肉の違いによる配管の全体的又は部分的な温度変化が大きく発現する。したがって、短時間且つ所定の精度で、簡便に減肉を予測することが可能である。本発明は、配管外部が保温材等で覆われ、配管外部から大気へ向かう熱伝達量が小さい場合に、特に有効である。   According to the present invention, since the heat that has heated the pipe is moved not to the atmosphere side but to the fluid flowing inside the pipe, the amount of heat transfer per pipe unit area / unit time is large. The entire or partial temperature change of the piping due to the difference is greatly expressed. Therefore, it is possible to easily predict the thinning in a short time and with a predetermined accuracy. The present invention is particularly effective when the outside of the pipe is covered with a heat insulating material or the like and the amount of heat transfer from the outside of the pipe to the atmosphere is small.

本発明によれば、プラント施工時又はプラント停止時、一度、配管にヒーターや温度センサーを取り付けておけば、測定の度に、それらを取り付ける必要がないため、配管減肉予測に伴う段取りが軽減される。   According to the present invention, once a plant or a plant is shut down, once a heater or temperature sensor is attached to the pipe, it is not necessary to attach them every time measurement is performed. Is done.

本発明の効果をさらに例示する:
(1)本発明によれば、通常運転中、すなわち、配管内部を流体が流れている状態で、測定対象配管部位を任意に設定した温度に加熱し、冷却することができるため、相対的に低い温度の流体側への熱移動の過程により、任意の配管温度に到達する時間(又は任意の時間における配管温度)から配管減肉を予測するができ、配管単位面積・単位時間当たりの熱移動が大きいため、減肉の差異による時間差(又は任意の時間における配管温度差)が大きく、実用上十分な精度が達成できる。このため、配管の状況、測定対象面積、流体の状態に応じた「減肉量と時間差(又は任意の時間における配管温度差)の関係」を簡易的にパターン化した配管減肉予測プログラムを作成すれば、複雑な伝熱解析を行うことなく、簡便に配管の減肉を予測することが可能となる;
(2)配管内部を流れている流体を活用して配管を冷却するため、配管を保温材が覆っている場合のプラントの通常運転中において、精度よく配管減肉予測試験を実行することができる;
(3)配管の加熱終了後、配管から配管内部を流れている流体に向かって移動する熱量は、配管から配管外部の大気に向かって移動する熱量に比べて格段に大きい。したがって、配管に減肉が発生している場合には、発生していない場合に比べて、配管の温度変化が大きくなる。また、減肉箇所周辺の温度変化は、そうでない箇所の温度変化に比べて、温度変化が大きくなる。このため、簡単に減肉ないし減肉範囲を特定することができる。
(4)本発明によれば、減肉の有無を簡単に検出し、減肉範囲を実用上十分な精度で検出することができる。なお、さらに、正確な減肉量を測定する場合には、超音波を用いて配管の肉厚を測定すればよい。
The effects of the present invention are further illustrated:
(1) According to the present invention, the pipe part to be measured can be heated to an arbitrarily set temperature and cooled during normal operation, that is, in a state in which fluid is flowing inside the pipe. By the process of heat transfer to the low temperature fluid side, pipe thinning can be predicted from the time to reach any pipe temperature (or pipe temperature at any time), and heat transfer per pipe unit area / unit time Therefore, the time difference (or pipe temperature difference at an arbitrary time) due to the difference in thickness reduction is large, and practically sufficient accuracy can be achieved. For this reason, a pipe thinning prediction program that simply patterns the relationship between the thinning amount and the time difference (or pipe temperature difference at an arbitrary time) according to the pipe status, measurement area, and fluid status is created. This makes it possible to easily predict pipe thinning without performing complex heat transfer analysis;
(2) Since the pipe is cooled by utilizing the fluid flowing inside the pipe, the pipe thinning prediction test can be executed with high accuracy during normal operation of the plant when the pipe is covered with a heat insulating material. ;
(3) The amount of heat that moves from the pipe toward the fluid flowing inside the pipe after the heating of the pipe is much larger than the amount of heat that moves from the pipe toward the atmosphere outside the pipe. Therefore, when the pipe is thinned, the temperature change of the pipe is larger than when the pipe is not thinned. Further, the temperature change around the thinned portion becomes larger than the temperature change at the other portions. For this reason, the thinning or thinning range can be easily specified.
(4) According to the present invention, the presence or absence of thinning can be easily detected, and the thinning range can be detected with sufficient practical accuracy. Furthermore, when measuring an accurate thickness reduction, the thickness of the pipe may be measured using ultrasonic waves.

以下に、本発明の実施の形態を示す。   Embodiments of the present invention are shown below.

本発明の好ましい実施の形態においては、予め、配管表面にヒーター、温度センサーを取り付けた後、配管を保温材で覆うような復旧を行い、その後、通常運転中に、配管を加熱した後、相対的に低い温度の流体側(配管内部を流れる流体側)への熱移動の過程における、配管温度変化、例えば、所定の配管温度に到達する時間(又は所定の時間における配管温度)から配管減肉を予測する。   In a preferred embodiment of the present invention, after attaching a heater and a temperature sensor to the pipe surface in advance, recovery is performed such that the pipe is covered with a heat insulating material, and then the pipe is heated during normal operation. Pipe temperature change in the process of heat transfer to the low temperature fluid side (the fluid side flowing inside the pipe), for example, pipe thinning from the time to reach a predetermined pipe temperature (or pipe temperature at a predetermined time) Predict.

本発明の好ましい実施の形態は、冷却により、配管の状況、測定対象面積、流体の状態に応じた「減肉量と任意温度に到達する時間差(又は任意の時間における配管温度差)の関係」を簡易的にパターン化した配管減肉予測データに基づいて、配管減肉を予測する。   According to a preferred embodiment of the present invention, “a relation between a thinning amount and a time difference to reach an arbitrary temperature (or a pipe temperature difference at an arbitrary time)” depending on the state of the pipe, the area to be measured, and the state of the fluid by cooling The pipe thinning is predicted based on the pipe thinning prediction data that is simply patterned.

本発明の好ましい実施の形態において、前記温度センサーは、前記配管の複数箇所の温度を測定するよう複数個配置され、前記予測手段は、前記複数箇所のそれぞれの前記温度変化に基づいて、前記配管の部分的な前記減肉状態を予測する。この形態によれば、配管において、減肉している箇所ないし範囲を検出することができる。   In a preferred embodiment of the present invention, a plurality of the temperature sensors are arranged so as to measure temperatures at a plurality of locations of the piping, and the predicting means is configured based on the temperature changes at the plurality of locations. Predicting the partial thinning state. According to this embodiment, it is possible to detect a portion or range where the thickness is reduced in the pipe.

本発明は、配管内部を流れている流体の側への熱移動による配管温度変化に基づいて減肉予測をするから、配管が保温材で覆われている場合に特に有効であるが、前記配管の外部が保温材で覆われていない場合も十分な精度で減肉予測が可能である。   Since the present invention predicts thinning based on a change in pipe temperature due to heat transfer to the fluid flowing inside the pipe, it is particularly effective when the pipe is covered with a heat insulating material. It is possible to predict the thickness reduction with sufficient accuracy even when the outside of the container is not covered with a heat insulating material.

本発明の好ましい実施の形態において、前記予測手段は、前記配管が部分的又は全体的に、前記第1の設定温度から第2の設定温度に冷却されるまでの第1の経過時間に基づいて前記減肉状態を予測する。この形態によれば、単位熱量が移動に要する時間に基づいて減肉予測をする。   In a preferred embodiment of the present invention, the predicting means is based on a first elapsed time until the piping is partially or entirely cooled from the first set temperature to the second set temperature. The thinning state is predicted. According to this aspect, the thickness reduction is predicted based on the time required for the unit calorie to move.

本発明の好ましい実施の形態に係る装置は、前記経過時間と前記配管の減肉状態との関係が記録された第1のデータベースを有し、前記予測手段は、前記第1の経過時間に基づいて前記第1のデータベースを参照して、前記減肉状態を予測する。   The apparatus which concerns on preferable embodiment of this invention has a 1st database with which the relationship between the said elapsed time and the thinning state of the said piping was recorded, The said prediction means is based on the said 1st elapsed time. The thinning state is predicted with reference to the first database.

本発明の好ましい実施の形態において、前記予測手段は、前記配管が部分的又は全体的に前記第1の設定温度に到達後、前記加熱が終了されて第2の経過時間が経過した際における該配管の部分的又は全体的な温度に基づいて、前記減肉状態を予測する。この形態によれば、単位時間当たりに移動する熱量に基づいて減肉予測をする。   In a preferred embodiment of the present invention, the predicting means is configured so that the heating is terminated and a second elapsed time has elapsed after the piping has partially or wholly reached the first set temperature. The thinning state is predicted based on the partial or overall temperature of the piping. According to this aspect, the thickness reduction is predicted based on the amount of heat that moves per unit time.

本発明の好ましい実施の形態に係る装置は、前記第2の経過時間が経過した際における前記温度と前記減肉状態との関係が記録された第2のデータベースを有し、前記予測手段は、前記第2の経過時間が経過した際における前記温度に基づいて前記第2のデータベースを参照して、前記減肉状態を予測する。   The apparatus according to a preferred embodiment of the present invention includes a second database in which a relationship between the temperature and the thinning state when the second elapsed time has elapsed is recorded, and the prediction unit includes: The thinning state is predicted with reference to the second database based on the temperature when the second elapsed time has elapsed.

本発明の好ましい実施の形態において、配管を加熱するヒーターとして、用途に応じて種々の電気ヒーターを用いることができる。また、配管温度を測定する手段として、熱電対を用いることができる。電気ヒーター、熱電対の配置箇所は、配管形状、流量計、弁、圧力計、温度計等の取付け状況に応じて決定する。   In a preferred embodiment of the present invention, various electric heaters can be used as a heater for heating a pipe depending on the application. Moreover, a thermocouple can be used as a means for measuring the pipe temperature. The placement location of the electric heater and thermocouple is determined according to the pipe shape, flow meter, valve, pressure gauge, thermometer, and other installation conditions.

以下、図面を参照して、本発明の一実施例を説明する。   An embodiment of the present invention will be described below with reference to the drawings.

図1は、本発明の一実施例に係る配管減肉予測装置の構成を説明するための図である。   FIG. 1 is a diagram for explaining a configuration of a pipe thinning prediction apparatus according to an embodiment of the present invention.

図1を参照すると、運転中の配管の減肉を予測する減肉予測装置は、保温材3で覆われ、その内部を流体1が流れている状態の配管2を加熱するヒーター4と、ヒーター4を制御して配管2を部分的又は全体的に少なくとも流体1の温度を超える第1の設定温度に加熱するヒーター制御手段6と、配管2の部分的又は全体的な温度を検出する温度センサー5と、前記配管が部分的又は全体的に前記第1の設定温度に到達後、前記加熱が終了され、前記流体により該配管が冷却されていく際に、前記温度センサーにより検出される該配管の部分的又は全体的な温度変化に基づいて、該配管の減肉状態を予測する予測手段8と、を有する。   Referring to FIG. 1, a thinning prediction device for predicting thinning of a pipe during operation is covered with a heat insulating material 3, a heater 4 for heating the pipe 2 in a state where the fluid 1 flows inside, and a heater 4, heater control means 6 for heating the pipe 2 partially or entirely to a first set temperature that exceeds at least the temperature of the fluid 1, and a temperature sensor for detecting the partial or total temperature of the pipe 2 5 and the pipe detected by the temperature sensor when the pipe is partially or wholly reaches the first set temperature and then the heating is finished and the pipe is cooled by the fluid. Predicting means 8 for predicting the thinning state of the pipe based on the partial or total temperature change.

温度センサー5は、配管2の複数箇所の温度を測定するよう、配管表面上に複数個配置され、予測手段8は、複数箇所のそれぞれの前記温度変化に基づいて、配管2の部分的な減肉状態を予測する。   A plurality of temperature sensors 5 are arranged on the surface of the pipe so as to measure temperatures at a plurality of locations of the pipe 2, and the predicting means 8 performs partial reduction of the pipe 2 based on the temperature changes at the plurality of locations. Predict meat status.

複数個の温度センサー5は、温度検出手段7を介して予測手段8に接続され、予測手段8には、各温度センサー5の出力信号が温度検出手段7によって変換された温度検出信号が入力される。   The plurality of temperature sensors 5 are connected to the prediction means 8 via the temperature detection means 7, and the temperature detection signals obtained by converting the output signals of the temperature sensors 5 by the temperature detection means 7 are input to the prediction means 8. The

予測手段8は、配管減肉予測プログラム10を実行するコンピュータから構成され、データベース9に接続される。   The prediction means 8 is composed of a computer that executes the pipe thinning prediction program 10 and is connected to the database 9.

データベース9は、配管2が前記第1の設定温度から第2の設定温度に冷却されるまでの第1の経過時間と減肉状態との関係、及び/又は、前記第1の設定温度に到達後、前記加熱が終了されて第2の経過時間が経過した際における配管温度と減肉状態との関係が記録されている。   The database 9 reaches the first set temperature and / or the relationship between the first elapsed time until the pipe 2 is cooled from the first set temperature to the second set temperature and the thinned state. After that, the relationship between the pipe temperature and the thinned state when the second elapsed time has elapsed after the heating is completed is recorded.

プログラム10は、データベース9を参照して得られる配管2が部分的又は全体的に減肉していない場合の温度変化(第1の経過時間と減肉状態との関係、又は、第2の経過時間が経過した際における配管温度と減肉状態との関係)と、測定された配管2の部分的又は全体的な温度変化とを比較する手順と、前記比較結果に基づいて、配管2の減肉状態を予測する手順と、が記録されている。   The program 10 changes the temperature when the pipe 2 obtained by referring to the database 9 is not partially or totally thinned (the relationship between the first elapsed time and the thinned state, or the second elapsed The relationship between the pipe temperature when the time has passed and the thinned state) and the measured partial or total temperature change of the pipe 2 and the reduction of the pipe 2 based on the comparison result. The procedure for predicting the meat state is recorded.

なお、プログラム10を、複数個の温度センサー5によって得られる複数の温度変化データ同士を比較して、前記比較結果に基づいて、配管2の減肉状態を予測するよう構成してもよい。   Note that the program 10 may be configured to compare a plurality of temperature change data obtained by the plurality of temperature sensors 5 and predict a thinning state of the pipe 2 based on the comparison result.

次に、図1の装置を用いた配管減肉予測方法について説明する。図2は、本発明の一実施例に係る配管減肉予測方法を説明するためのフローチャートである。   Next, a pipe thinning prediction method using the apparatus of FIG. 1 will be described. FIG. 2 is a flowchart for explaining a pipe thinning prediction method according to an embodiment of the present invention.

図1及び図2を参照すると、ステップ1〜2において、測定者は、その内部を流体1が流れている状態の配管2の表面の指定された配管減肉予測箇所にヒーター4と、温度センサー5を取り付ける。   Referring to FIGS. 1 and 2, in steps 1 and 2, the measurer has a heater 4 and a temperature sensor at a designated pipe thinning prediction portion on the surface of the pipe 2 in a state where the fluid 1 is flowing inside. 5 is attached.

ステップ3において、測定者は、ヒーター4とヒータ制御手段6により、配管2の内部を流体1が流れている状態で、ヒーター4をオン状態にして、配管2を全体的に流体温度を超える第1の設定温度(所定温度)に加熱する。   In step 3, the measurer turns on the heater 4 with the heater 4 and the heater control means 6 in a state where the fluid 1 is flowing through the pipe 2, and the pipe 2 generally exceeds the fluid temperature. 1 is heated to a preset temperature (predetermined temperature).

ステップ4〜5において、測定者は、配管2が前記第1の設定温度に到達後、ヒーター4をオフにして、前記加熱を終了する。   In steps 4 to 5, the measurer turns off the heater 4 after the pipe 2 reaches the first set temperature, and ends the heating.

ステップ6において、前記流体により配管2が冷却され、相対的に低い温度である流体1の側への熱移動により配管温度ないし配管表面温度が低下していく。   In step 6, the pipe 2 is cooled by the fluid, and the pipe temperature or the pipe surface temperature is lowered by heat transfer to the fluid 1 side having a relatively low temperature.

ステップ7において、予測手段8は、各温度検出信号に基づいて、配管2の各温度センサー5が設置された箇所が、前記第1の設定温度から第2の設定温度に冷却されるまでの第1の経過時間を測定する。   In step 7, the predicting means 8 determines the first time until the location where each temperature sensor 5 of the pipe 2 is installed is cooled from the first set temperature to the second set temperature based on each temperature detection signal. Measure the elapsed time of 1.

ステップ8において、プログラム10は、データベース9を参照して得られる配管2が部分的又は全体的に減肉していない場合の温度変化(第1の経過時間と減肉状態との関係)と、測定された温度変化とを比較する手順と、前記比較結果に基づいて、配管2の減肉状態を予測する手順とを予測手段8に実行させる。   In Step 8, the program 10 changes the temperature when the pipe 2 obtained by referring to the database 9 is not partially or wholly thinned (relationship between the first elapsed time and the thinned state), The predicting means 8 is caused to execute a procedure for comparing the measured temperature change and a procedure for predicting the thinning state of the pipe 2 based on the comparison result.

なお、ステップ7において、前記第2の経過時間(所定時間)が経過した際における配管温度と減肉状態との関係を測定し、該測定結果に基づいて、減肉状態を予測してもよい。また、測定データ同士の比較に基づいて、減肉状態を予測してもよい。   In step 7, the relationship between the pipe temperature and the thinned state when the second elapsed time (predetermined time) has elapsed may be measured, and the thinned state may be predicted based on the measurement result. . Moreover, you may estimate a thinning state based on the comparison between measurement data.

温度センサー5は、配管の形状、弁、流量計の使用・設置状況を考慮として、配管の減肉し易い箇所に重点的に設置する。これによって、早期に配管減肉の大きい箇所の発見が容易となり、予測結果如何によっては、次回プラント停止時に配管を取り替えるなり、あるいは超音波法等により厳密に測定し、今後の運用管理を適切に行うことが可能となる。   The temperature sensor 5 is intensively installed at a location where the pipe is likely to be thinned in consideration of the shape of the pipe, the use of the valve, and the flow meter. This makes it easy to find parts with large pipe thinning at an early stage, and depending on the prediction results, the pipes will be replaced at the next plant shutdown, or measurements will be made strictly using the ultrasonic method, etc., and future operation management will be appropriately performed. Can be done.

以上説明した配管減肉予測方法のシミュレーション解析を行った。図3は、本発明の一実施例に係る配管減肉予測方法のシミュレーション解析条件を説明するための図である。   The simulation analysis of the pipe thinning prediction method described above was performed. FIG. 3 is a diagram for explaining simulation analysis conditions of a pipe thinning prediction method according to an embodiment of the present invention.

図3を参照すると、解析対象の配管は、配管の長さ5m、口径(内径)250mm、配管の肉厚10mm、減肉箇所の肉厚5mmとした。減肉箇所は、配管を長さ方向に1m毎に5分割し、中央の部分(1m)が減肉していることとした。配管の外側を覆う保温材の厚さは120mmである。配管内部に流れている流体は水、その温度は100℃、流量0.25m/sとした。配管の加熱温度、すなわち、第1の設定温度は200℃とした。 Referring to FIG. 3, the pipe to be analyzed has a pipe length of 5 m, a caliber (inner diameter) of 250 mm, a pipe thickness of 10 mm, and a reduced thickness of 5 mm. As for the thinned portion, the pipe was divided into 5 portions every 1 m in the length direction and the central portion (1 m) was thinned. The thickness of the heat insulating material that covers the outside of the pipe is 120 mm. The fluid flowing inside the pipe was water, the temperature was 100 ° C., and the flow rate was 0.25 m 3 / s. The heating temperature of the piping, that is, the first set temperature was 200 ° C.

以上の条件で、配管内を実際に流体(水)が流れている場合、第1の設定温度に加熱された配管が流体によって冷却されていく際、配管表面の各箇所の温度変化を試算し、これに基づいて減肉箇所を予測できるかどうかを解析した。   Under the above conditions, when fluid (water) is actually flowing in the pipe, when the pipe heated to the first set temperature is cooled by the fluid, the temperature change at each location on the pipe surface is estimated. Based on this, it was analyzed whether or not a thinning point could be predicted.

図4は、図3に示した条件で行ったシミュレーションの解析結果を説明するためのグラフである。グラフ中、配管表面において上線は減肉していない箇所(肉厚10mm)の温度変化を示す線であり、下線は配管表面において減肉箇所(配管中央1m部分の肉厚5mmの箇所)の温度変化を示す線である。   FIG. 4 is a graph for explaining the analysis result of the simulation performed under the conditions shown in FIG. In the graph, the upper line on the pipe surface shows the temperature change of the part where the thickness is not reduced (thickness 10 mm), and the lower line is the temperature of the part where the thickness is reduced on the pipe surface (thickness of 5 mm at the center 1 m part of the pipe). It is a line which shows a change.

図4の上線を参照すると、減肉していない箇所では、加熱終了後(第1の設定温度200℃)、120℃(第2の設定温度)に到達するまでの第1の経過時間が約7秒であり、減肉箇所では約3秒であった。よって、減肉していない箇所と、減肉箇所では、所定温度に到達するまでの経過時間の違いが顕著であることが確認され、この違いに基づいて容易に減肉を予測することができる。当然、減肉が進めば、その違いはさらに拡大する。   Referring to the upper line in FIG. 4, in a portion where the thickness is not reduced, the first elapsed time until reaching 120 ° C. (second set temperature) after the end of heating (first set temperature 200 ° C.) is about 7 seconds and about 3 seconds at the thinned portion. Therefore, it is confirmed that there is a significant difference in elapsed time until the predetermined temperature is reached at the portion where the thickness is not reduced and the portion where the thickness is reduced, and the thickness reduction can be easily predicted based on this difference. . Of course, the difference will be further widened as the thickness is reduced.

また、図4の上線を参照すると、減肉していない箇所では、加熱終了後(第1の設定温度200℃)から5秒(第2の経過時間)経過した際、配管表面温度は130℃であり、減肉箇所は108℃であった。よって、減肉していない箇所と、減肉箇所では、所定経過時間における温度の違いが顕著であることが確認され、この違いに基づいて容易に減肉を予測することができる。当然、減肉が進めば、その違いはさらに拡大する。   Further, referring to the upper line in FIG. 4, in a portion where the thickness is not reduced, the pipe surface temperature is 130 ° C. after 5 seconds (second elapsed time) has elapsed from the end of heating (first set temperature 200 ° C.). The thinned portion was 108 ° C. Therefore, it is confirmed that the difference in temperature at the predetermined elapsed time is significant between the portion where the thickness is not reduced and the location where the thickness is reduced, and the thickness reduction can be easily predicted based on this difference. Of course, the difference will be further widened as the thickness is reduced.

図5(A)〜図5(D)は、熱移動量の違いが配管表温度に与える影響を説明するための図である。図5(A)は肉厚Lで移動熱量qの場合、図5(B)は肉厚L/2で移動熱量qの場合、図5(C)は肉厚Lで移動熱量3qの場合、図5(D)は肉厚L/2で移動熱量3qの場合のそれぞれ説明図である。λは配管の熱伝導率λ[W/m・k]である。   FIG. 5A to FIG. 5D are diagrams for explaining the influence of the difference in the amount of heat transfer on the piping surface temperature. FIG. 5A shows a case where the wall thickness L is a moving heat quantity q, FIG. 5B shows a case where the wall thickness L / 2 is a moving heat quantity q, FIG. 5C shows a case where the wall thickness L is a moving heat quantity 3q, FIG. 5 (D) is an explanatory diagram for a case where the wall thickness is L / 2 and the moving heat quantity is 3q. λ is the thermal conductivity λ [W / m · k] of the pipe.

図5(A)〜図5(D)を参照すると、熱伝導率λ[W/m・k]の配管が温度T1からT2(T1>T2)へ熱移動する時(肉厚L/2の場合は温度T1からt2(T1>t2)へ熱移動する時)、肉厚L((A)と(C)参照)の場合と、減肉して肉厚が半分のL/2((B)と(D)参照)の場合とにおいて、移動熱量がq[w/m2(=J/s・m2)]の場合と、その3倍である場合を比較すると、肉厚差による表面温度差は、移動熱量が3倍になると、表面温度差も3倍に広がることが分かる。   Referring to FIGS. 5A to 5D, when a pipe having a thermal conductivity λ [W / m · k] is thermally transferred from temperature T1 to T2 (T1> T2) (thickness L / 2). In the case of heat transfer from the temperature T1 to t2 (T1> t2)), in the case of the wall thickness L (see (A) and (C)), and L / 2 ((B ) And (D))), the difference in surface temperature due to the difference in wall thickness when the amount of heat transferred is q [w / m2 (= J / s · m2)] and the case where it is three times as large It can be seen that when the heat of movement is tripled, the surface temperature difference is also tripled.

ちなみに、温度300k、圧力101.3kPaにおける水の熱伝導率は0.610[w/m・k]に対して、空気の熱伝導率は0.0261[w/m・k]であり、水は空気に比較し熱伝導率が23倍強大きい。よって、配管に水のような、空気よりも熱伝導率の高い液体が流れている場合は、水と配管面の熱伝達率hw[w/m2・k]は、空気と配管面の熱伝達率haよりも大きいため、流れがない場合よりも更に移動熱量が大きく、表面温度差も一層顕著となり、一層精度よく配管減肉を予測することができる。   Incidentally, the thermal conductivity of water at a temperature of 300 k and a pressure of 101.3 kPa is 0.610 [w / m · k], whereas the thermal conductivity of air is 0.0261 [w / m · k]. Has a thermal conductivity 23 times greater than that of air. Therefore, when a liquid having a higher thermal conductivity than air, such as water, flows in the pipe, the heat transfer coefficient hw [w / m2 · k] between the water and the pipe surface is the heat transfer between the air and the pipe surface. Since it is larger than the rate ha, the amount of heat transferred is larger than when there is no flow, the surface temperature difference becomes more remarkable, and pipe thinning can be predicted with higher accuracy.

本発明は、プラント稼動時の配管減肉測定、或いは配管内部の流体の流れを停止させることができない場合の配管減肉測定に好適に適用される。   The present invention is suitably applied to pipe thinning measurement during plant operation or pipe thinning measurement when the flow of fluid inside the pipe cannot be stopped.

本発明の一実施例に係る配管減肉予測装置の構成を説明するための図である。It is a figure for demonstrating the structure of the pipe thinning prediction apparatus which concerns on one Example of this invention. 本発明の一実施例に係る配管減肉予測方法を説明するためのフローチャートである。It is a flowchart for demonstrating the pipe thinning prediction method which concerns on one Example of this invention. 本発明の一実施例に係る配管減肉予測方法のシミュレーション解析条件を説明するための図である。It is a figure for demonstrating the simulation analysis conditions of the pipe thinning prediction method which concerns on one Example of this invention. 図3に示した条件で行ったシミュレーションの解析結果を説明するためのグラフである。It is a graph for demonstrating the analysis result of the simulation performed on the conditions shown in FIG. (A)〜(D)は、熱移動量の違いが配管表温度に与える影響を説明するための図である。(A)-(D) is a figure for demonstrating the influence which the difference in the amount of heat transfers has on piping surface temperature.

符号の説明Explanation of symbols

1 配管内部を流れる流体
2 配管
3 保温材
4 ヒーター
5 温度センサー
6 ヒーター制御手段
7 温度検出手段
8 予測手段
9 データーベース
10 配管減肉予測プログラム
DESCRIPTION OF SYMBOLS 1 Fluid which flows through piping 2 Piping 3 Insulation material 4 Heater 5 Temperature sensor 6 Heater control means 7 Temperature detection means 8 Prediction means 9 Database 10 Piping thinning prediction program

Claims (8)

その内部を流体が流れている状態の配管を加熱するヒーターと、
前記ヒーターを制御して前記配管を部分的又は全体的に少なくとも前記流体の温度を超える第1の設定温度に加熱するヒータ制御手段と、
前記配管の部分的又は全体的な温度を検出する温度センサーと、
前記配管が部分的又は全体的に前記第1の設定温度に到達後、前記加熱が終了され、前記流体により該配管が冷却されていく際に、前記温度センサーにより検出される該配管の部分的又は全体的な温度変化に基づいて、該配管の減肉状態を予測する予測手段と、
を有する、ことを特徴とする配管減肉予測装置。
A heater that heats the pipe with fluid flowing through it,
Heater control means for controlling the heater to heat the pipe partially or entirely to a first set temperature that exceeds at least the temperature of the fluid;
A temperature sensor for detecting a partial or total temperature of the pipe;
After the pipe reaches the first set temperature partially or entirely, when the heating is finished and the pipe is cooled by the fluid, the pipe is partially detected by the temperature sensor. Or a predicting means for predicting the thinning state of the pipe based on the overall temperature change;
A pipe thinning prediction apparatus characterized by comprising:
前記温度センサーは、前記配管の複数箇所の温度を測定するよう複数個配置され、
前記予測手段は、前記複数箇所のそれぞれの前記温度変化に基づいて、前記配管の部分的な前記減肉状態を予測する、ことを特徴とする請求項1記載の配管減肉予測装置。
A plurality of the temperature sensors are arranged to measure temperatures at a plurality of locations of the pipe,
The pipe thinning prediction apparatus according to claim 1, wherein the prediction unit predicts the partial thinning state of the pipe based on the temperature change at each of the plurality of locations.
前記予測手段は、前記配管が部分的又は全体的に、前記第1の設定温度から第2の設定温度に冷却されるまでの第1の経過時間に基づいて前記減肉状態を予測する、ことを特徴とする請求項1記載の配管減肉予測装置。   The predicting means predicts the thinning state based on a first elapsed time until the pipe is partially or entirely cooled from the first set temperature to the second set temperature. The pipe thinning prediction apparatus according to claim 1. 前記経過時間と前記配管の減肉状態との関係が記録された第1のデータベースを有し、
前記予測手段は、前記第1の経過時間に基づいて前記第1のデータベースを参照して、前記減肉状態を予測する、ことを特徴とする請求項3記載の配管減肉予測装置。
A first database in which the relationship between the elapsed time and the pipe thickness reduction is recorded;
The pipe thinning prediction apparatus according to claim 3, wherein the prediction means predicts the thinning state with reference to the first database based on the first elapsed time.
前記予測手段は、前記配管が部分的又は全体的に前記第1の設定温度に到達後、前記加熱が終了されて第2の経過時間が経過した際における該配管の部分的又は全体的な温度に基づいて、前記減肉状態を予測する、ことを特徴とする請求項1記載の配管減肉予測装置。   The predicting means is configured to determine a partial or total temperature of the pipe when the second elapsed time has elapsed after the heating is completed after the pipe reaches the first set temperature partially or entirely. The pipe thinning prediction apparatus according to claim 1, wherein the thinning state is predicted based on the following. 前記第2の経過時間が経過した際における前記温度と前記減肉状態との関係が記録された第2のデータベースを有し、
前記予測手段は、前記第2の経過時間が経過した際における前記温度に基づいて前記第2のデータベースを参照して、前記減肉状態を予測する、ことを特徴とする請求項5記載の配管減肉予測装置。
A second database in which a relationship between the temperature and the thinning state when the second elapsed time has elapsed is recorded;
The piping according to claim 5, wherein the predicting unit predicts the thinning state with reference to the second database based on the temperature when the second elapsed time has elapsed. Thinning prediction device.
その内部を流体が流れている状態の配管を部分的又は全体的に前記流体温度を超える第1の設定温度に加熱する工程と、
前記配管が部分的又は全体的に前記第1の設定温度に到達後、前記加熱を終了し、前記流体により該配管を冷却させる工程と、
前記流体により該配管を冷却させる前記工程において、前記配管の部分的又は全体的な温度変化を測定する工程と、
前記温度変化に基づいて前記配管の減肉状態を予測する工程と、
を含む、ことを特徴とする配管減肉予測方法。
Heating a pipe in a state where a fluid flows therein partially or entirely to a first set temperature exceeding the fluid temperature;
After the piping partially or entirely reaches the first set temperature, the heating is terminated, and the piping is cooled by the fluid;
In the step of cooling the pipe with the fluid, measuring a partial or total temperature change of the pipe;
Predicting a thinning state of the pipe based on the temperature change;
The pipe thinning prediction method characterized by including.
その内部を流体が流れている状態の配管が部分的又は全体的に該流体温度を超える第1の設定温度に加熱され、該配管が部分的又は全体的に該第1の設定温度に到達後、該加熱が終了され、該記流体により該配管が冷却される際、該冷却時における前記配管の部分的又は全体的な温度変化が測定される配管減肉予測方法において、
予め設定された前記配管が部分的又は全体的に減肉していない場合の前記温度変化と、測定された前記配管の部分的又は全体的な前記温度変化とを比較する手順と、
前記比較結果に基づいて、該配管の減肉状態を予測する手順と、
をコンピュータに実行させることを特徴とする配管減肉予測プログラム。
After the pipe with fluid flowing therein is partially or wholly heated to the first set temperature that exceeds the fluid temperature, and the pipe reaches the first set temperature partially or wholly In the pipe thinning prediction method, when the heating is finished and the pipe is cooled by the fluid, the partial or total temperature change of the pipe at the time of cooling is measured.
A procedure for comparing the temperature change when the preset pipe is not partially or wholly thinned with the measured partial or total temperature change of the pipe;
A procedure for predicting a thinning state of the pipe based on the comparison result;
A pipe thinning prediction program characterized by causing a computer to execute.
JP2005106012A 2005-04-01 2005-04-01 Pipe thinning prediction apparatus and pipe thinning prediction method Expired - Fee Related JP4579749B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005106012A JP4579749B2 (en) 2005-04-01 2005-04-01 Pipe thinning prediction apparatus and pipe thinning prediction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005106012A JP4579749B2 (en) 2005-04-01 2005-04-01 Pipe thinning prediction apparatus and pipe thinning prediction method

Publications (2)

Publication Number Publication Date
JP2006284416A true JP2006284416A (en) 2006-10-19
JP4579749B2 JP4579749B2 (en) 2010-11-10

Family

ID=37406493

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005106012A Expired - Fee Related JP4579749B2 (en) 2005-04-01 2005-04-01 Pipe thinning prediction apparatus and pipe thinning prediction method

Country Status (1)

Country Link
JP (1) JP4579749B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013105224A1 (en) * 2012-01-11 2013-07-18 中国電力株式会社 Pipe test device
KR101400625B1 (en) * 2012-09-27 2014-05-27 현대제철 주식회사 System and method for managing tlc using temperature sensor
WO2018105142A1 (en) * 2016-12-09 2018-06-14 富士通株式会社 Method, device and system for diagnosing pipe
CN114018981A (en) * 2021-09-28 2022-02-08 彩虹显示器件股份有限公司 Estimation method and system for service life of platinum channel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09281064A (en) * 1996-04-09 1997-10-31 Hitachi Plant Eng & Constr Co Ltd Detection method for inside state of object to be measured
JPH10170458A (en) * 1996-12-10 1998-06-26 Daikin Ind Ltd Method and apparatus for heating by heat medium metal and method and apparatus for inspecting cast body
JPH11211682A (en) * 1998-01-29 1999-08-06 Hitachi Plant Eng & Constr Co Ltd Heating or cooling jig for pipe
JP2000161943A (en) * 1998-11-26 2000-06-16 Hitachi Ltd Apparatus for measuring pipe thickness

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09281064A (en) * 1996-04-09 1997-10-31 Hitachi Plant Eng & Constr Co Ltd Detection method for inside state of object to be measured
JPH10170458A (en) * 1996-12-10 1998-06-26 Daikin Ind Ltd Method and apparatus for heating by heat medium metal and method and apparatus for inspecting cast body
JPH11211682A (en) * 1998-01-29 1999-08-06 Hitachi Plant Eng & Constr Co Ltd Heating or cooling jig for pipe
JP2000161943A (en) * 1998-11-26 2000-06-16 Hitachi Ltd Apparatus for measuring pipe thickness

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013105224A1 (en) * 2012-01-11 2013-07-18 中国電力株式会社 Pipe test device
JP5507774B2 (en) * 2012-01-11 2014-05-28 中国電力株式会社 Piping test equipment
KR101400625B1 (en) * 2012-09-27 2014-05-27 현대제철 주식회사 System and method for managing tlc using temperature sensor
WO2018105142A1 (en) * 2016-12-09 2018-06-14 富士通株式会社 Method, device and system for diagnosing pipe
CN114018981A (en) * 2021-09-28 2022-02-08 彩虹显示器件股份有限公司 Estimation method and system for service life of platinum channel
CN114018981B (en) * 2021-09-28 2023-12-01 彩虹显示器件股份有限公司 Method and system for estimating service life of platinum channel

Also Published As

Publication number Publication date
JP4579749B2 (en) 2010-11-10

Similar Documents

Publication Publication Date Title
US9011608B2 (en) Method and device for measuring deposit thickness
US6678628B2 (en) Apparatus and methods for monitoring and testing coolant recirculation systems
KR101135168B1 (en) Method and system for inspecting creep and thinned damage in heat exchanger steam tube
US7824099B2 (en) Accurate gas temperature estimation at transient conditions based on temperature sensor readings
JP2022532435A (en) Devices, systems, and methods for non-invasive thermal interrogation
JP4579749B2 (en) Pipe thinning prediction apparatus and pipe thinning prediction method
JP2000161943A (en) Apparatus for measuring pipe thickness
CN105466495B (en) Measuring method that is a kind of while obtaining pars intramuralis non-uniform temperature field and wall thickness
JP2001228105A (en) Characteristic evaluating device for thermally insulating coating and charcteristic evaluating method tehrefor
JP2008157806A (en) Method and apparatus for diagnosing infrared piping
JP2008134095A (en) Lifetime evaluation device of high temperature apparatus, and lifetime evaluation method of high temperature apparatus
JPS6126809A (en) Method and instrument for detecting state of sticking body in fluid pipe
RU2700349C1 (en) Method for determination of thickness of deposits on inner surface of pipeline
CN102590274A (en) System and method used for testing heat conductivity of thin film thermoelectric material
CN109506807B (en) Method for simultaneously measuring internal temperature and wall thickness of high-temperature structure under steady-state condition
Braillard et al. Advanced experimental tools designed for the assessment of the thermal load applied to the mixing tee and nozzle geometries in the PWR plant
JP3940335B2 (en) Defect inspection method and apparatus
JP2012154855A (en) Physical quantity measuring device and physical quantity measuring method
CN109506806A (en) Thermal structure internal temperature and measurement method while thickness under a kind of transient condition
JPH0293315A (en) Thickness examining method of metallic pipe wall or the like
US20230105228A1 (en) Estimation device, estimation method, and non-transitory computer-readable recording medium for thickness of deposit
RU2631007C1 (en) Heat meter based on overhead sensors
JP3707994B2 (en) Infrared temperature detector and steam trap inspection device
JP4537776B2 (en) Method for measuring temperature of fluid flowing in pipe and method for measuring fluid heat quantity
JP6022623B2 (en) Thermal conductivity estimation system, method and program, and thermal conductivity test apparatus

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080331

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100524

A131 Notification of reasons for refusal

Effective date: 20100601

Free format text: JAPANESE INTERMEDIATE CODE: A131

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100728

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Effective date: 20100817

Free format text: JAPANESE INTERMEDIATE CODE: A01

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Effective date: 20100826

Free format text: JAPANESE INTERMEDIATE CODE: A61

FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 3

Free format text: PAYMENT UNTIL: 20130903

R150 Certificate of patent (=grant) or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

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

LAPS Cancellation because of no payment of annual fees