对海底管道焊接和ECA评估技术作了简介,对荔湾3-1项目采用GMAW和SAW两种焊接工艺完成的海底管线环焊缝的表面缺陷和内部缺陷的临界尺寸进行了评估。评估结果给出了海底管线对接环焊缝的缺陷接收标准,该标准超出常规标准中的缺陷验收范围,能够降低海管焊接返修率,缩短施工周期,降低成本。 The submarine pipeline welding and ECA assessment techniques were introduced. The critical dimensions of the surface defects and internal defects of the subsea pipeline girth welds completed by two welding processes of GMAW and SAW in Liwan 3-1 Project were evaluated. The results of the assessment show that the standards for acceptance of defects in butt welds of subsea pipelines are beyond the scope of acceptance of defects in conventional standards, which can reduce the rate of rework of offshore pipelines, shorten the construction period and reduce costs.