Ultrasonic Testing (UT) is a non-destructive evaluation method that uses high-frequency sound waves (typically 1–10 MHz) to measure material thickness, detect internal defects, and assess the structural integrity of pipeline components.

Ultrasonic Testing (UT) is a non-destructive evaluation method that uses high-frequency sound waves (typically 1–10 MHz) to measure material thickness, detect internal defects, and assess the structural integrity of pipeline components. UT is one of the most widely used NDT techniques in the pipeline industry.

UT methods include:
• Pulse-echo — single transducer measures wall thickness from reflected sound waves.
• Through-transmission — two transducers detect internal defects.
• Phased Array UT (PAUT) — electronic beam steering for detailed crack characterization.
• Time-of-Flight Diffraction (TOFD) — precise crack sizing using diffracted waves.

UT excels for spot measurements, weld inspection, and detailed defect characterization but requires direct access to the pipe surface. For buried pipelines where direct access is unavailable, EMPIT’s CMI technology provides non-invasive corrosion detection from the surface — complementing UT for comprehensive pipeline integrity programs.