Transneft Diascan has upgraded an ultrasonic defectoscope for inspection of pipelines with diameter from 40" to 48". After the upgrading, this in-line device was marked as “40 UZD.04”' which stands for the 4th generation of ultrasonic defectoscopes.
The main purpose of upgrading the ultrasonic device was to improve the efficiency of detecting defects located in dents. The upgraded defectoscope is equipped with a new carrier for WM sensors, which has increased slide flexibility and adaptive slats with sensors on movable suspensions. Thanks to this, the sensors touch the pipe’s surface even when the device is going through a deformed section, over a dent or a buckle, which allows to detect and measure defects such as scratch marks, metal loss and lamination in dents and buckles. At the same time, the number of WM sensors on the new carrier was increased by 1.8 times, which allowed to reduce the distance between the sensors circumferentially.
The ultrasonic WM 4th generation defectoscope with increased resolution and an adaptive sensors carrier that guarantees their optimal positioning on the pipe’s surface (including in areas with geometric defects) provides the following advantages:
- reduced number of scans with diagnostic data loss, including during inspection of areas with pipeline geometry defects;
- reduced costs of external non-destructive flaw-detecting testing of sections with data losses;
- improved detection efficiency and reliability; more accurate measurement of corrosion defects on the inner and outer surfaces of the pipeline.
The device was upgraded from January 2016 to August 2018. Preliminary and acceptance tests were carried out at Transneft Diascan’s test ground as well as at a section of the BTS-2 oil pipeline operated by Transneft Baltic. The device was tested to confirm its resistance to various climatic (temperatures from -40°C to +50°C) and mechanical factors. The tests confirmed the compliance of defect detection and measurement efficiency with the required specifications.
Pictured: A 40 UZD.04 upgraded ultrasonic defectoscope (on the left) and a device of the previous generation