Phase array detection process and verification method for sealing surface of steam pipe flange of thermal power plant

By using phased array detection technology, combined with longitudinal wave sector scanning and TCG curve calibration, the problems of incomplete defect coverage and large quantitative errors in the inspection of flange sealing surfaces of steam pipes in thermal power plants have been solved, achieving efficient and accurate detection of corrosion defects and bolt hole cracks on flange sealing surfaces.

CN122109313APending Publication Date: 2026-05-29GUODIAN SCI & TECH RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUODIAN SCI & TECH RES INST
Filing Date
2026-03-06
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing technologies, the inspection of the flange sealing surface of the steam pipe in thermal power plants has problems such as incomplete defect coverage and large quantitative errors. In particular, the different failure risk areas of the flange sealing surface and bolt holes are not effectively distinguished for inspection, leading to safety hazards such as sealing failure and steam leakage.

Method used

The phased array detection process is adopted, and the longitudinal wave sector scanning and secondary wave coverage are combined with different types of TCG curve calibration. Different detection parameters are used for corrosion defects on the flange sealing surface and bolt hole crack defects to ensure comprehensive coverage and quantitative accuracy.

Benefits of technology

It achieves 100% detection of corrosion defects on flange sealing surfaces and cracks in bolt holes, with quantitative errors controlled within ±1.1mm, improving the reliability and accuracy of detection and reducing safety hazards.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of steam guide pipe flange sealing surface of thermal power plant phased array detection process and verification method, steam guide pipe flange sealing surface of thermal power plant phased array detection process includes: according to the different types of defects on the steam guide pipe flange, different phased array detection parameters are used, longitudinal wave fan-shaped scanning is used on the outer circumferential wall of steam guide pipe flange, for the detection of sealing surface corrosion defects, secondary wave covers flange sealing surface area, primary wave determines the position of sealing surface corrosion defects, for the detection of bolt hole crack defects, secondary wave covers the range with the radius r of bolt hole periphery, primary wave identifies the length of bolt hole crack, different TCG curves are calibrated for different types of defects to ensure that the echo amplitude deviation of different types of defects is less than or equal to ±3dB.According to the phased array detection process of the steam guide pipe flange sealing surface of the thermal power plant of the application, different defect types can be effectively detected, to ensure the comprehensive coverage and quantitative accuracy of different types of defects.
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