Pulsed Eddy Current

Swiss Approval Advanced NDT based in UK, manages all activities related to NDT inspection services, with use of Pulsed Eddy Current (PEC) Testing, in order to measure percentage variations in steel thickness. Our Advanced NDT Laboratory operations, are conformed with ISO 17025 requirements.

Working Principle

PEC is an advanced electromagnetic technique used to assess corrosion in ferromagnetic structures such as carbon steel and cast iron. A pulsed magnetic field is induced into the material using a coil. As this magnetic field interacts with the conductive material, it generates eddy currents. These eddy currents are sensed by the probe; their characteristics depend on the material properties and thickness of the sample. The received electromagnetic signals are compared with reference signals from known calibration blocks, and this way are related to the thickness of the component. PEC is practical and provides quantitative results on corrosion, determining the average wall loss with the footprint area.

Testing Applications

PEC is commonly used for inspection of corrosion under insulation and corrosion scab and blister assessment. The method works without the need to remove insulation or prepare rough or dirty surfaces.

  • Corrosion under insulation
  • Corrosion under fire proofing
  • Remaining wall thickness under heavy corrosion
  • Repair wraps
  • Monitoring; repeat surveys
  • Offshore structures (splash zone)
  • Underwater inspections
  • Corrosion under scabs
  • Flow accelerated corrosion
  • Can be applied to material < 550°C