Automated UT Corrosion Mapping

Swiss Approval Advanced NDT based in UK, manage evaluation of the condition of storage tanks, pipelines, pressure vessels and other critical equipment, supporting the integrity management processes to ensure effective and safe operation, through specific Automated UT equipment, for corrosion mapping. 

Our Advanced NDT Laboratory operations, are conformed with ISO 17025 requirements.

Our solution can give almost 100% coverage in a band up to 450 mm wide, significantly increasing Probability of Detection (POD) of defects and corrosion, enabling Clients to determine the optimum repair strategy, and improve remaining life assessment (RLA) & risk based inspection (RBI) maintenance programs.


Scanning heads of the system, sharing the same high performance system controller, so different scanning heads can be utilised depending on the inspection requirements.

The steerable tractor units incorporate high torque stepper motors and powerful magnetic drive wheels ensuring the scanner remains fixed to the inspection surface even whilst inverted. The system is properly working, to ride over weld caps & lap joints up to 8 mm high.


Scanning head is designed to maximize scanning rates on large surface areas such as tank shells, pressure vessels and other structures, as well as operating circumferentially on curved surfaces such as pipelines or pressure
vessels from 152 mm (6 inches) up to flat plate.


  • Storage tank shells and roofs
  • Horizontal storage tanks
  • Pipelines
  • Pressure vessels
  • Spheres
  • Ship hulls
  • High temperatures assets up to 200 C.


  • Localised / generalised pitting
  • General corrosion and erosion
  • Laminations
  • Internal coating failures or dis-bonding
  • Hydrogen blistering (HB)
  • Hydrogen induced cracking (HIC)
  • Stress corrosion cracking (SCC)
  • Microbiologically influenced corrosion (MIC)


A specific software integrates scanner control, data capture, data analysis and reporting tools. The software shows a real-time display of the ultrasonic A-scan, C-scan, thickness measurement and positional data, with a maximum resolution of 0.5 mm x 0.5 mm. All of this information is recorded when a scan is saved.


A-scan waveform processing is fully digital, both in real time and during post processing.

Our system records A-scans in raw RF unfiltered form, which can then be processed afterwards, including rectification, filtering, wave smoothing and noise reject.

This minimises the set up on site and avoids re-scanning due to incorrect ultrasonic setup.


The B-scan amplitude view shows the B-scan profile in both X and Y dimensions at a selected point of the C-scan. Using the B-scan amplitude view, the operator can easily identify any defects or inclusions.


The intuitive software is designed around the concept of C-scan ‘layers’. This allows the operator to quickly switch between each of the multiple C-scan views generated. During an inspection, the A-scan trace, B-scan amplitude view and resulting C-scan image are shown within the software in real time providing immediate inspection feedback.