The Unified Solution

Using the ET Array Technique on De-Alloyed 90/10 Copper-Nickel

Versa’s Eddy Current division utilized Electromagnetic Testing (ET) to detect erosion defects in this case study. Below is a high-level overview of a project that our Baton Rouge Eddy Current division successfully completed.

We utilized the ET Array Technique to more accurately size ID erosion defects that were occurring due to de-alloying of 90-10 copper nickel.  As the 90-10 copper nickel gradually changed to 99.5% copper and .5% nickel, the primary damage mechanism of ID erosion started to occur.  The Array Technique could pinpoint the defects on the tube circumferential and more accurately size the defect, compared to the Bobbin Technique, which uses more of an averaging of the tube wall around the tube. As a side benefit, we were able to precisely decipher between the de-alloying damage mechanism and the ID erosion damage mechanism; this was due to utilizing the ET Array Technique.

If you have any questions or would like to learn more, please reach out to our Eddy Current Supervisor (Baton Rouge, LA), Scott Whipkey at

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