立式成品油储罐底板缺陷的声发射检测

Acoustic emission detection of floor defects of vertical product oil storage tank

为掌握某已平稳运行12 a的20 000 m^(3)立式成品油储罐的底板缺陷情况,对其加载压力并在底部壁板上安装12个传感器,采集并分析该储罐底板的声发射数据,确定罐底板的腐蚀点坐标,并根据检测结果评价该储罐底板的腐蚀状态等级。经过清罐和喷砂作业后,开罐检查罐底板腐蚀缺陷的尺寸、相对坐标和形貌特征,并进一步基于储罐的建设情况和运行情况分析腐蚀缺陷产生的具体原因。调查结果表明,罐底板同时存在施工损伤缺陷和点蚀缺陷,但所有已知的缺陷深度都在可接受的范围内;开罐检查找到的罐底板腐蚀缺陷全被声发射检测所标记,证明了声发射检测技术在成品油储罐检测方面的适用性和准确性。

In order to investigate the defects of the bottom plate of a 20 000 m^(3) vertical product oil storage tank which has been running smoothly for 12 years, the pressure is loaded and 12 sensors are installed on the bottom wall plate of the tank. The acoustic emission data of the bottom plate of the tank are collected and analyzed to determine the corrosion point coordinates of the bottom plate. According to the detection results, the corrosion state of the bottom plate of the tank is evaluated. After tank cleaning and sandblasting, the size and relative coordinates as well as the shape characteristics of corrosion defects on the tank bottom plate were checked by opening the tank, and the specific causes of corrosion defects were further analyzed based on the construction and operation background of the tank. The investigation results show that there are both construction damage defects and pitting corrosion defects in the tank bottom, but all the known defect depths are within the acceptable range. The corrosion defects of tank bottom plate found in open tank inspection are all marked by acoustic emission testing, which proves the applicability and accuracy of acoustic emission testing technology in the detection of product oil storage tank.