In this study, in order to propose a calibration method using a correction formula for each steel grade obtained in advance as a calibration method for plate thickness measurement using a permanent UT sensor such as MHI’s Thin-film UT sensor, a temperature-sound velocity correction formula for each steel grade was calculated by obtaining sound velocity values for each temperature from ordinary temperature to 200 degrees centigrade using the Thin-film UT sensor and multiple specimens of steel grade. Using th...
英字タイトル:
Proposal of calibration method for ultrasonic thickness continuous monitoring at high temperature using a thin film UT sensor

Intelligent ECT system for 7/8 inch tubes has been qualified as official method for inspection of Steam Generator tubes in Japan since 2003. We have developed Intelligent ECT system for 3/4 inch outer diameter tubes, which is applicable for full length inspection of all tubes in Steam Generator. We have carried out the verification test on passage, scanning speed, detectability of various defects, performance of auto screening, effectiveness of filtering, and accuracy of depth sizing of wears. Totally...
英字タイトル:
Development of Intelligent ECT System for 3/4 inch SG Tubes

超音波による厚さ測定方法を規定する JIS Z 2355-1では，超音波厚さ計の調整方法として超音波厚さ計の設定音速が試験体の音速と一致するように調整する手順が示されている。実際に厚さ測定を行う際に，対象が高温物体の場合は，対比試験片を用いた音速の調整が実用上困難であるため，別途取得した音速情報を使用して超音波厚さ計の音速を調整する手法が現実的である。しかしながら，材料の高温での音速変化のデータや，当該手法が適用された事例の報告はあまりなされていない。そこで本報告では， JIS Z 2355-1の規定に従った超音波厚さ測定事例として，配管の保温材下に常設して使用する弊社製の薄膜 UTセンサを用いて高温時の超音波厚さ測定を行った試験結果を紹介する。...

In order to solve the problems of the thickness measurement, we have developed a thin-film UT sensor having excellent high-temperature durability and conformability in thin film form. In this paper, it was confirmed that the accuracy of thickness measurement for both complex geometries and plates at high-temperature was equivalent to the accuracy of conventional thickness measurement methods. It was also confirmed that the durability at high temperature and for temperature change in the actual equipmen...
英字タイトル:
technology using high-temperature thin-film UT sensor

As for periodical measurement of pipe wall thinning, several concerns are indicated, such as unstability of measurement position and contact condition, additional work for removal of insulating material and preparing scaffold, unstability on complex geometry and difficulty of continuous monitoring under plant operation. In order to solve these concerns, we developed thin-film UT sensor which has high-temperature durability and flexibility. Furthermore, we preliminary developed prototype linear phased-a...
英字タイトル:
Monitoring of pipe wall thinning using high-temperature thin-film UT sensor