Definition of the type of clean pipe defect.

Depending on the phenomenon, the type of clean pipe defect can be defined as follows:

Inner hole pits (processing defects, material defects)

Outer wall pits (processing defects, material defects)

Inner hole skin (material defect)

Inner hole plaque (processing defect)

Inner hole ash tube (processing defect)

Inner hole rolling marks (processing defects)

Inner hole sanding (processing defects)

Outer surface skin (processing defects)

Bamboo stamping (processing defects)

Surface pull (processing defect)

Wavy bending (processing defects) 

Outer round orthopaedic injury (processing defects)

End flat (processing defect)