Pulsed Eddy Current

Pulsed eddy current (PEC) is an advanced nondestructive testing technique capable of identifying volumetric losses in ferrous material through an overlying material such as insulation or fire proofing. This means measurement of the materials thickness can be taken even when the probe is not in direct contact with the material subject to inspection. The working principal of PEC technology is the probe induces eddy currents into the test material then receives a response as these eddy currents decay. Based on the characteristics of this decay an inferred thickness can be determined.

PEC is a versatile tool with applications to inspect:

  • corrosion under insulation (CUI) 
  • corrosion blisters and scabs
  • flow accelerated corrosion
  • corrosion under fireproofing (CUF)
  • corrosion under coatings
  • splash zone
  • surface and waterworks corrosion.


PEC is a noninvasive technique that can be performed on piping while in service without insulation removal and without the inherent dangers of RT techniques. When paired with IRED’s rope access ready technicians, PEC inspection can reach hard to access areas without the added cost and time of erecting scaffolding. Using the latest in PEC technology IRED can even inspect through galvanized steel weather jackets. Our trained analysts provide timely inspection and reports with easy to interpret c-scan data presentation


PEC is a screening tool and is limited in such that it determines the material thickness within the probes averaging area. Consequently, PEC is not suitable for finding linear flaws or defects significantly smaller than the averaging area such as pitting. PEC is also susceptible to under sizing defects that are smaller than the averaging area as the deepest portion of the defect will be lost within the average. Built in software tools use advanced algorithms to help combat this under sizing. Mass effects near metallic structures such as pipe shoes and edge effects at the end of an inspection component also serve to mask defects.


Contact us for more information on how IRED’s pulsed eddy current services can help you ensure safe and reliable operation of your equipment and assets.