基于南海某平台12.75″（1″=2.54cm）生产立管内检测工程背景，系统梳理了管道内检测标准与规范，制定了检测目标、检测方法、检测精度及腐蚀剩余强度评价参数。基于超声内检测设备，对比分析了常规注水发射内检测器的立管内检测方案与牵拉式立管内检测方案，发现牵拉式立管内检测方案的操作时间仅为注水内检测方案的23%。在管道内窥系统初步了解到管道内部的洁净程度与腐蚀情况的基础上，采用超声牵拉内检测方案完成立管的海上壁厚检测与腐蚀评价，明确了立管腐蚀深度超过10%壁厚处的缺陷信息。根据ASME 31G的腐蚀评价指标得到立管缺陷位置的预估维修比，制定立管修复方案，为后续同类检测提供参考。

Based on the background of the internal inspection project of a 12.75-inch production riser on a South China Sea platform， the standards and specifications for pipeline internal inspection were systematically organized. The inspection objectives， methods， precision， and parameters for evaluating the remaining strength of corrosion were established. Using ultrasonic internal inspection equipment， a comparative analysis was conducted between the conventional in-line inspection method based on water driving and the pulling through method. It was found that the operation time of the pulling through method was only 23% of that of the water driving method. Based on the preliminary assessment of internal cleanliness and corrosion conditions obtained through pipeline CCTV system， the ultrasonic pulling through internal inspection solution was employed to conduct wall thickness testing and corrosion evaluation of the offshore riser， identifying defect information where corrosion depth exceeded 10% of the wall thickness. According to the corrosion evaluation index of ASME 31G， the estimated repair factor of the riser defect location was obtained， and a riser repair plan was formulated， providing a reference for subsequent similar inspections.