Overview
Our Ultrasonic Flaw Inspection Machine for Drill Pipes and Drill Collars is a fully automatic CNC-controlled NDT system engineered for 100% volumetric inspection of OCTG products including drill pipes and drill collars.
Outfitted with high-performance ultrasonic transducer arrays, it delivers highly sensitive detection of longitudinal cracks, transverse fractures, inclined flaws and laminar delaminations. The equipment performs accurate full-length wall thickness measurement simultaneously with flaw detection within a single inspection pass.
All inspection procedures and data logging fully comply with official API 5CT and API 5L standards, perfectly meeting strict quality control specifications for OCTG manufacturers across the global oil and gas sector.
Working Principle
The machine operates on the ultrasonic pulse-echo technique. High-frequency ultrasonic waves (2–5 MHz) are generated by piezoelectric probes and transmitted into the pipe wall via water-coupling.
- No defect: Ultrasound travels through the wall and reflects from the inner surface, producing a back-wall echo.
- With defect: Waves reflect earlier at discontinuities (cracks, inclusions, laminations), generating a defect echo before the back-wall signal.
- The system calculates defect depth, size, and position based on echo time and amplitude, enabling accurate, repeatable, and high-speed inspection.
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