摘要
某油田多条输气管道投产运行一年之后探伤发现无缝管线管表面存在发纹。经过对无缝管线管表面发纹情况进行试验分析后认为,此类发纹属于折叠类缺陷,其深度没有超过标准规定的公差范围;该类缺陷是在制管厂产生的,在使用过程中没有扩展;该批无缝管线管表面肉眼检查未发现超标缺陷,经过打磨探伤才发现发纹,根据订货标准GB/T8163-1987规定,该批管线管质量符合订货技术要求。
Through relevant NDT process, surface hair cracks are found with seamless steel linepipes as used for several gas pipelines that have been operating in a certain oil field for about one year. Based on test analysis of the hair cracks, it is identified that the hair cracks are of some kind of fold defect with depths within the tolerance range as specified in application specification, and that such defects are ex-works ones, and have not extended during the site operation. No defects beyond the application specification are found with the lot of seamless steel linepipes by relevant visual inspection, and only after undergoing surface grinding treatment, and then NDT check, are the said hair defects revealed. According to the applicable Specification GB/T 8163-1987 used for the order, this lot of linepipes are in compliance with relevant technical requirements.
出处
《钢管》
CAS
2010年第3期48-51,共4页
Steel Pipe
关键词
管线管
无缝钢管
表面发纹
金相分析
折叠缺陷
Linepipe
Seamless steel pipe
Surface hair crack
Metallographic analysis
Fold defect
