摘要
超声内检测器检测含缺陷管道时,回波信号高度敏感于探头与管道的空间相对方位,是影响管壁厚度检测精度的关键影响因素之一。基于超声检测原理,利用自主研制的A扫描超声内检测实验装置,针对DN219×7.48 mm、Q235碳钢外壁含体积型缺陷管道,开展超声探头与被测管道分别在正对状态和存在轴向错位、环向错位以及两种错位共存4种状态下的超声检测实验,获得了不同空间姿态下的回波信号。分析了回波信号的时域波形特征,基于提取的时域特征参数,建立了管道壁厚计算过渡方式,进而确定了壁厚。发现能确定含缺陷管段壁厚的错位范围比确定无缺陷管段壁厚的错位范围小;轴向错位对信号中缺陷底面回波特征的影响比环向错位大。结果表明:提出的含缺陷管道壁厚计算方法能准确确定管道壁厚,计算壁厚与实际壁厚最大误差小于5%,说明检测精度满足工程需要。
The relative spatial position between ultrasonic probe and pipe which is highly sensitive to the echo signal is one of the key factors affecting detection accuracy of the pipe wall thickness when detecting the pipe containing defect.A-scan ultrasonic internal detection experimental setup was self-developed to measure the echo signals under different relative spatial positions using Q235 carbon steel pipe with size of DN219×7.48 mm containing volumetric defect as tested sample.Echo signals of four relative positions between ultrasonic probe and pipe were analyzed,i.e.,face-to-face standard state,axial dislocation state,circumferential dislocation state,axial and circumferential coexisting dislocation state.The time domain features of echo signals were analyzed.The transition method for calculating the pipe wall thickness was established based on the extracted time domain characteristic parameters,and finally the wall thickness was evaluated.It is found that the dislocation range covering the wall thickness of pipe with defects is smaller than that of pipe without defects.The influence of axial misalignment on echo characteristics of bottom surface is greater than circumferential misalignment.The results demonstrate that the wall thickness of pipe with defects can be predicted accurately by the proposed method with the maximum relative error less than 5%to measurements which meets the engineering accuracy.
作者
蔡亮学
董辉
陈飞
徐广丽
CAI Liang-xue;DONG Hui;CHEN Fei;XU Guang-li(School of Oil&Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,China;Oil&Gas Fire Protection Key Laboratory of Sichuan Province,Chengdu 610000,China)
出处
《科学技术与工程》
北大核心
2022年第30期13293-13300,共8页
Science Technology and Engineering
基金
国家自然科学基金(51606160)
山东省油气储运安全重点实验室基金(19CX05007A)。
关键词
超声波
内检测
回波信号
管道
缺陷
ultrasonic
internal inspection
echo signal
pipe
defect
