Long Range Ultrasonic Testing (LRUT)
Long-range ultrasonic testing is a quick way to detect corrosion in pipelines. The method can screen up to 100 metres of pipeline in a single test, or 50 metres in both directions.
A wavemaker device directs low frequency (20-100 kHz) ultrasonic waves longitudinally into the pipeline wall by fitting a ring of transducers around the pipeline. The method effectively detects changes in the cross-section of the pipeline, allowing it to identify corrosion and other abnormalities. LRUT has been used for screening piping systems above ground due to its high coverage rates compared to manual techniques, but it is still the only reliable technique for screening pipe systems underground or underwater where access is often limited or very expensive to gain access for manual contact techniques. At the same time this provides the possibility of using welds and flanges as distance references.
Aqualis has qualified experts in using this method to help you get a cost-effective report on the condition of your pipelines.
LRUT – Long Range Ultrasonic Testing:
The technology works by placing an array of probes in a belt that is circumferentially wrapped around the pipe being inspected. The system then generates ultrasonic guided waves that travel longitudinally down the length of the pipe. The distance covered by the ultrasonic waves is determined by a variety of factors such as pipe coating, branch connections, fittings, and above ground or buried locations.
Advantages
- 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.
- Saves time since there is no need to remove insulation, apart from 1 meter for the transducer ring.
- Easy to screen wall penetrating pipelines (both built-in and sleeved penetrations).