TU 14-3-460:2009/TU U 27.2-05757883-207:2009 Surface Testing Request

Inspection of the outer surface of pipes is carried out visually without the use of magnifying means.

The internal surface of pipes with an internal diameter of 70 mm or more is inspected using a periscope or videoscopic systems.

It is allowed to inspect the inner surface of pipes without the use of instruments, using lighting devices at both ends of the pipe against the light.

For pipes with an internal diameter of less than 70 mm, as well as pipes with an internal diameter of 70 mm or more that have not been inspected by a periscope, the manufacturer guarantees that the internal surface of the pipes meets the requirements of these specifications based on satisfactory results of 100% ultrasonic inspection.

The classification of defects is carried out in accordance with DSTU 2680 (OST 14-82 [ 18 ]).

The depth of defects is checked after filing and subsequent measurement.

The wall thickness in areas where defects have been cleaned is measured using an ultrasonic thickness gauge or mechanical measuring instruments. It is possible to determine the wall thickness in places where defects are cleaned as the difference between the actual wall thickness at the end of the pipe (closest to the defect) and the cleaning depth along one generatrix.