Long Range Ultrasonic Testing (LRUT)

Long Range Ultrasonic Testing (LRUT)

Long Range Ultrasonic Testing (LRUT)

Long Range Ultrasonic Testing (LRUT)

Long Range UT(LRUT)

Long range ultrasonic testing is a rapid way of screening for corrosion in pipelines. The method enables screening of up to 100 meters of pipeline in one test, i.e. 50 meters in both directions. LRUT has been employed for screening piping systems above ground as a result of the high production coverage rates as opposed to manual techniques, but it still remains the only reliable technique for screening pipe systems underground or underwater where access is often limited or very costly to gain access for manual contact techniques. The technology continues to be improved and the number of applications utilizing this system has greatly expanded.

By fitting a ring of transducers around the pipeline, a wave maker device directs low frequency (20-100 kHz) ultrasonic waves via the transducers, longitudinally into the pipeline wall. The method effectively detects changes in the pipeline’s cross-section, enabling it to identify corrosion and other abnormalities. At the same time this provides the possibility of using welds and flanges as distance references.

LRUT – Long Range Ultrasonic Testing: the technology operates by placement of an array of probes placed in a belt, circumferentially wrapped around the pipe being inspected. The system then generates ultrasonic guided waves longitudinally down the length of pipe, distance covered by the ultrasonic waves is dependent on a number of factors related to pipe coating, branch connections, fittings and above ground or buried locations. The system can inspect both directions from each inspection location and therefore can maximize production.

Merits of Long-Range Ultrasonic Testing (LRUT)

  • More than 100 times faster than traditional ultrasonic methods.
  • Up to 100 meters screening distance on pipelines above ground.
  • Up to 10 meters screening distance on pipelines buried in the ground.
  • Possibility to do sub-sea scanning.
  • 100% screening coverage of pipe wall
  • Cost effective solution for pipe integrity management programs