脉冲涡流扫查技术在炼化企业隐患排查中的应用

Application of Pulsed Eddy Current Scanning Technology in Investigation of Refining and Chemical Enterprises

炼化企业设备和管道的腐蚀检查是一项长期的系统工作,目前常用的方法是超声波测厚检测。然而,对于带保温结构的部位,若全部拆除保温结构后再进行检测,往往费时费力并不能达到预期的检测效果,脉冲涡流扫查技术可以在不拆除保温结构的情况下进行减薄程度的初步筛查,结果表明:对于不带保温结构的部位,脉冲涡流扫查技术具有较高的准确度,检测结果与超声波测厚的验证结果基本一致,而对于带保温结构的管道,脉冲涡流扫查结果受保温结构、接管、伴热管、焊缝等多种因素的影响,测得结果与超声波测厚结果存在一定的偏差。建议采用脉冲涡流扫查技术进行筛查,对于腐蚀程度严重的部位(相对减薄量>40%),可拆除保温结构并进行超声波测厚验证。

It is a long-term systematic work of corrosion inspection of equipment and pipelines in refining and chemical enterprises.At present,ultrasonic thickness measurement is the commonly used method.However,for the pipe with insulation,it is time-consuming and laborious,and cannot achieve the desired test effect if the insulation structure is completely removed.The pulse eddy current scanning technology can perform preliminary screening of thinning degree without removing the insulation structure.The results show that the pulsed eddy current scanning technology has high accuracy for the parts without thermal insulation structure,and the detection results are basically consistent with the verification results of ultrasonic thickness measurement.The results of pulsed eddy current scanning are affected by many factors such as insulation structure,nozzle,heat tracing pipe,weld and so on.In fact there is a certain deviation between the measured results and the ultrasonic thickness measurement results.It is recommended to use pulsed eddy current scanning technology for screening.For the parts with serious corrosion degree(relative thinning>40%),the insulation structure can be removed and the ultrasonic thickness measurement can be verified.