High Temperature Phashed Arrays Applications
- Phased Array UT presenting ‘A’, ‘B’ and ‘C’ Scans.
- Corrosion Evaluation, Hydrogen Related Condition Monitoring & Weld Testing.
- Performed by Certified Level 2 PA technicians and verified by Level 3 PA (not just UT).
- We apply Phased arrays offline and online up to 200°C actual surface temperature. Continuous water flow ensures that the sensors remain well below their Curie temperature without their operational performance being affected. Thus, accurate evaluation of the structural integrity of the inspected component can be accomplished.
How it is accomplished:
- Our new approach involves a 64 channel PA sensor using water as coupling.
- During operation water flows between the hot surface of the component inspected and sensor array allowing heat transfer to take place thus, reducing actual sensor temperature to normal levels.
- In this way hot measurements are not any longer distorted which means that correction is not needed. This allows straightforward scanning of components t higher temperatures, such as vessels and pipelines, without the need to stop operation and reducing unwanted openings of such equipment during outages reducing significantly maintenance works.
- Acquired C scans are then stitched together providing a meaningful image of the corrosion profile and its extent.
Case Study: Hot belly Scanning
- A Hot Temperature Corrosion Detection Survey was carried out on a Vessel shell.
- This inspection was performed using an Ultrasonic Immersion Technique utilising Phased Array technology. The purpose of this methodology was to allow the Vessel to be inspected whilst still ‘On-line’ with no disruption to normal operation.
- The surface operating temperature of the Vessel during inspection was in excess of 150˚C.
- A Composite Wrap was already installed on the Vessel ‘Boot’ due to a previous leak in that area.
- Based on the above situation, a risk-based approach was taken and fourteen (14) sections were selected for ultrasonic sampling using A, B & C-Scans in search for the presence of internal corrosion/erosion.
- Moderate to severe corrosion/erosion was found on the shell bottom in the middle section.