For the deformation, the defect exceeds the allowable deviation of the component, should be installed before the ground correction, repair, qualified before installation.
对于变形、缺陷超过允许偏差的构件，应安装前，在地面进行矫正、修理，合格后方可安装。
2
While installation, transport and other industrial accidents of the petroleum pipeline, it is unavoidable to encounter various damage and defect, such as surface flaw, crack, etc.