National Techincal Services in-service tank inspection

Expert API 653 and EEMUA 159 Inspections

With a highly skilled team of technicians, inspectors, and analysts, National Techincal Services provides expert API 653- and EEMUA 159-compliant inspections of out-of-service above ground storage tanks.

Detailed Analyses

Following API 653 and EEMUA 159 guidelines, our inspections include detailed analyses of all aspects of the tank’s:

  • foundation
  • internal floor
  • tank shell
  • nozzles and appurtenances
  • fixed roof.

Additionally, our analysts provide calculations for the:

  • safe-fill height
  • hydrostatic test height
  • time frame for subsequent inspections.

Our Techniques

To ensure accurate and thorough data collection, our teams use a variety of inspection techniques, including:

  • visual inspections
  • B-scan ultrasonic testing
  • pit gauging
  • vacuum box testing
  • magnetic flux leakage (MFL) scanning
  • wet fluorescent magnetic particle (WFMP) testing
  • diesel testing
  • automated corrosion mapping
  • 3D digital reconstruction inspection and integrity analysis.

Thorough Reports

Our reports provide a complete picture of current tank conditions, as well as condition projections, so you can plan your maintenance schedule with confidence.

Included in our reports are:

  • photos and layout diagrams detailing problem areas
  • summaries highlighting significant findings
  • checklists detailing the inspection findings
  • detailed explanations of calculations
  • tables and graphs indicating foundation settlement
  • raw data from ultrasonic thickness readings
  • complete documentation on all non-destructive examinations (NDE).