Above ground tank inspections

What this test helps us understand

  • vessel surface crack detection and clad thickness measurement
  • loss of SS clad over the carbon steel shell 
  • the thickness of non-electrically conductive coatings on electrically conductive materials

What we commonly test
  • vessels with carbon steel shell and stainless steel clad


Test method summary

  • eddy current testing is essentially a near-surface technique
  • is based on the principle of measuring changes in the impedance of an electromagnetic coil as it is scanned over a surface of conductive material
  • a circular coil carrying an AC current is placed in close proximity to an electrically conductive specimen
  • the alternating current in the coil generates an alternating magnetic field, which interacts with the test material and induces eddy currents into the item being tested
  • variations in the electrical conductivity or magnetic permeability of the test item, or presence of any flaws, will cause a change in eddy current flow and corresponding change in the phase and amplitude of the measured current

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