超高压容器和管道周向超声检测(二)

超高压容器和管道作为高风险设备应用于石化、水晶制造等行业中。超高压容器和管道的内外径之比通常小于0．6，很难用常规的横波技术对其进行周向超声检测。本文分析了周向超声检测的主要技术难点，从厚壁筒形件的声场结构、径向缺陷的回波特征、表面缺陷的灵敏度、缺陷定位、灵敏度调节等方面进行试验和研究，总结出厚壁筒形件周向超声检测的工艺方法和参数，并在超高压人造水晶釜和超高压聚乙烯输送管的现场检测中对工艺方法和参数进行了验证，证明其对径向缺陷有足够的灵敏度和可靠性。

Circumferential Ultrasonic Testing for Ultra-high Pressure Vessels and Pipes(2)

Ultra-high pressure vessels and pipes are high risk equipment used in petrochemical and crystal fabrication industries.However,it is difficult to detect radial defects in such equipment with traditional shear wave(SW) technique for its ratio of inner radius to outer radius is often less than 0.6.The main reasons for this are analyzed in this article.Furthermore,the authors presented parameters for radial defects detection with circumferential ultrasonic testing(UT) based on theoretical as well as experimental investigations on the structure of sound field,diversity comparisons of radial defects echo,sensitivity of surface radial defects,defect location and sensitivity adjustment of the defects in thick-walled cylinder.Field tests of ultra-high pressure vessels for man-made crystal production and ultra-high pressure pipes for polyethylene show that the presented methods have sufficient sensitivity and reliability for detecting radial defects.