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Long-Range Ultrasonic Testing (LRUT)


Long-Range Ultrasonic Testing (LRUT) is an advanced Non-Destructive Testing. It is one of the fast inspection tools for carrying out pipeline survey for corrosion and other degradation using ultrasonic guided waves. LRUT has been developed to detect metal loss in piping. It is a pulse-echo system, aimed at testing large volumes of material from a single test point. The technique was initially developed for detecting Corrosion under Insulation (CUI) for piping in petrochemical plant. Subsequently, it has found widespread use in other inspection situations where pipes or tubes are normally not accessible. Pipes buried in soil, encased in a sleeve or located at high elevation and heater tubes. The aim of LRUT is to test long lengths of pipe rapidly with100% coverage of pipe wall and to identify areas of corrosion or erosion for further evaluation using other NDT techniques such as radiography or conventional ultrasonic inspection. The technique is equally sensitive to metal loss on both outside and inside surfaces of pipe.

Technique capability:

  • Low cost screening with 100% coverage.
  • Focussing capability to evaluate corrosion distribution around pipe circumference.
  • Testing of pipes up to 48 inches diameter.
  • Ideal where conventional testing is impossible or very costly e.g. clamped, insulated, elevated, underwater, sleeved or buried pipes.