Storage Tank


B-Scan Crawler

We use our robust B-Scan crawler to conduct in-service vertical tank shell ultrasonic thickness measurements without the need for scaffolding or other access systems. The crawler can take a stream of UT measurements in a 10mm wide scan every 1mm.


API 653 Specification Vacuum Boxes

API 653 specification Vacuum boxes are used to create a vacuum over suspected defects (like cracks) and over repairs in order to determine if there are any leaks, before reporting the findings.


The vacuum boxes are fitted with calibrated pressure gauges and vacuum relief safety valves.


MFL Corrosion Detection Scanner

A high speed, motorised magnetic flux leakage (MFL) corrosion detection scanner is used to inspect the tank floor. The scanner is can inspect up to 8000 square feet per shift.


Based on the latest magnetic technology it is easy to operate accurate and reliable. This is an important tool for any tank inspection program.

Corrosion is caused by environmental factors as well as the product being stored in the tanks.

Often the external visual appearance of the tank is good and it requires the use of the NDT

methods listed below in order to reveal the true condition of the metal structures.


  • Tank Roof Inspection (Visual, Photographic, UTM, UT)

  • Tank Shell Inspection (including out of roundness inspection)

  • Tank Floor (bottom plates) Inspection (MFL) and Mapping

  • Chime ring/critical zone inspection

  • Vacuum Box Testing

  • MPI and DPI of nozzles, new welds and repairs

  • Weld inspection (during repairs or new builds as well as UT)

  • Reporting as per API 653 codes and standards (including design calculations like

  • Remaining life calculations for roof, shell plate and nozzles)

  • Recommendations and repair work-scopes made based on full API 653 Inspection results

  • Issue of fit-for–service certification