LD管线的检验案例及问题处理

对某厂的LD管线进行全面检验时,发现该管线有严重的扭曲变形现象.在压力管道的全面检验中,这类现象非常罕见.经过现场宏观检验、材质光谱分析、超声波壁厚测定、焊缝渗透无损探伤、直管壁厚校核等检验项目后,确定为：管线在设计时未根据工艺状况设置补偿器,导致运行时由于较大温度变化产生非常大的热应力,造成管线扭曲变形及支架位移,形成应力集中.文中的案例分析给管道检验提供参考,确保化工生产安全运行.

Case of LD Pipeline Inspection and Treatment of the Problem

In a plant of LD pipeline to conduct a comprehensive inspection, it is found that the pipeline has a serious distor-tion phenomenon. In the pressure pipeline inspection, this kind of phenomenon is very rare. After the macroscopic inspection, ma-terial spectral analysis, ultrasonic thickness measurement, nondestructive testing, wall thickness weld penetration strength check inspection after the project, the conclusion is drawn：the pipeline designed is not according to the technological state setting com- pensator, thereby causing the occurrence of a very big thermal stress during the run-time due to a higher temperature change, cau- sing pipeline distortion and brakcet displacement, and then forming stress concentration. The case analysis for piping inspector provides a new train of thought when a similar problem is encountered, in an attempt to ensure the safe operation of chemical pro-duction.