包覆层液氨管道数字射线实时成像检测

Real-time digital radiography detection of coating liquid ammonia pipeline

针对在役氨制冷系统包覆层液氨管道常规检验手段难以实施的难题,提出利用X射线数字成像检测方法对管道服役阶段产生的缺陷进行实时成像检测。包覆层与介质的双重作用影响了X射线的线质与数字图像的缺陷可识别度,对透照工艺进行优化,优化后的试验结果表明,腐蚀部位与检测图像相吻合,该方法能够实时判定缺陷与腐蚀状况。包覆层液氨管道的无损检测、腐蚀检测及焊缝的咬边、错边检查有助于问题的及时发现和隐患的及时排除,从而实现管道的安全运行。

In order to solve the problem that the conventional inspection method for the liquid ammonia pipelines in the coating of the ammonia refrigeration system in service was difficult to carry out,a real-time imaging detection method based on X-ray digital imaging was proposed to detect the defects of the pipelines in the service stage.The double action of coating and medium affected the quality of X-ray and the defect recognition of digital image.Through the optimization of radiography technology and experimental verification,it was shown that the corrosion site coincided with the detected image,the method can judge the defect and corrosion status in real time.The nondestructive testing,corrosion testing,undercut and wrong edge inspection of the weld line of the liquid ammonia pipeline with coating layer were helpful to find out the problem and eliminate the hidden trouble in time,so as to realize the safe operation of the pipelines.