Check the abnormal outer surface of the outer tube body (scratches, water marks) and other abnormal outer surfaces with the first steel pipe weld bead facing down in each bundle.
The weld bead of the first steel pipe of each bundle shall be downward to check the abnormal outer surface of the outer pipe body (scratch, water mark) and so on.
The weld bead of the first steel pipe in each bundle shall face down to check the abnormal outer surface of the outer pipe body (scratches, water marks).