Technologies

Eddy current testing (ET) is a type of electromagnetic testing method in which electrical currents (eddy currents) are generated in a conductive material by a changing magnetic field. The strength of these eddy currents can be measured. Since the material defects cause interruptions in the flow of the current, the inspector can detect the presence a defect or any other change in the material. Raw data outputs are represented graphically as a C-scan image.


Nucleom offers a complete range of eddy current inspections, training, applications development and consultancy services. Eddy current testing generally do not need any surface preparation and is suitable for multiple uses. For instance, it is a great tool to find pits, cracks, ID & OD corrosion or grooving. ET can be divided into three major types;


CONVENTIONAL EDDY CURRENT (ET);
Conventional Eddy Current Testing uses probes that are equipped with a single coil that acts as a single sending and receiving device.


EDDY CURRENT ARRAY (ECA);
Eddy Current Array (ECA) displays multiple coils that are placed side by side in the same probe. Therefore, a larger area can be scan with one manual pass and flaw detection is also improved. ECA offers a significant advantage for the inspection of complex surfaces.


TUBE INSPECTION;
Eddy current inspection is often used to detect flaws, corrosion, erosion, thinning, cracking and other changes in tubing. For instance, heat exchangers and steam generators have thousands of tubes that must be prevented from leaking. These techniques can be conducted two different ways;

 

- Near Field Testing (NFT);

NFT is a new technology that relies on a simple driver-pickup eddy current probe design providing very simple signal analysis. This technology is a cost effective solution intended specifically for fin-fan carbon-steel tubing inspection.


- Remote Field Testing (RFT);
RFT is used to inspect ferromagnetic tubing such as carbon steel or ferritic stainless steel. This technology offers good sensitivity when detecting and measuring volumetric defects resulting from erosion, corrosion, wear, and baffle cuts.