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Next Step To Advanced Data Analysis With Pulsed Eddy Currents

Picture for Next Step To Advanced Data Analysis With Pulsed Eddy Currents
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Pulsed Eddy Current (PEC) technology is a widely accepted inspection method now covered by several industry standards such as ISO(1) 20669, API(2) RP 583, and the new ASME(3) Section V (BPVC for Boiler and Pressure Vessel Code), article 21. PEC is a versatile inspection technology which provides an average remaining wall thickness through insulation and coatings. The technique can also be used to safely assess the minimum remaining ligament under corrosion scabs or blisters without surface preparation. PEC is resilient to liftoff variations and provides volumetric measurements of remaining material. It is capable of both detecting and assessing general corrosion on the outer surface of the pipes such as scabs and blisters, and detecting erosion or Flow Accelerated Corrosion (FAC) on the inner surface.

Product Number: 51322-17568-SG
Author: Donald Picard, Olivier Bellavance, Gabriel Cyr, Andréanne Potvin
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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$20.00
$20.00

Pulsed Eddy Current (PEC) is a proven inspection method used for the detection and assessment of Corrosion Under Insulation (CUI), Corrosion Under Fireproofing (CUF), and material loss under various types of coatings or materials that prevent direct access to the surface. In recent years, PEC inspections have become increasingly common, enabled by more sensitive sensors and innovations that increased productivity such as dynamic scanning and Pulsed Eddy Current Array (PECA) sensors. The technology remains cross sensitive to wall loss and changes in electromagnetic properties or the presence of interfering components. This limitation renders analysis difficult on more complex geometries. The objective of this paper is to introduce an innovative data analysis tool for PEC technology. The new signal representation correlates localized changes in wall thickness measurement with signal amplitude changes to discriminate real wall loss from material property changes or interfering components. The tool provides a simple and easy to interpret vector with orientations illustrating the real or false nature of an indication. The various signatures are presented and explained based on a variety of field data and manufactured samples that demonstrate the capabilities and limitations of this new graphical representation. This innovation, used alongside existing tools, contributes to increased confidence of analysts when facing challenging applications.

Pulsed Eddy Current (PEC) is a proven inspection method used for the detection and assessment of Corrosion Under Insulation (CUI), Corrosion Under Fireproofing (CUF), and material loss under various types of coatings or materials that prevent direct access to the surface. In recent years, PEC inspections have become increasingly common, enabled by more sensitive sensors and innovations that increased productivity such as dynamic scanning and Pulsed Eddy Current Array (PECA) sensors. The technology remains cross sensitive to wall loss and changes in electromagnetic properties or the presence of interfering components. This limitation renders analysis difficult on more complex geometries. The objective of this paper is to introduce an innovative data analysis tool for PEC technology. The new signal representation correlates localized changes in wall thickness measurement with signal amplitude changes to discriminate real wall loss from material property changes or interfering components. The tool provides a simple and easy to interpret vector with orientations illustrating the real or false nature of an indication. The various signatures are presented and explained based on a variety of field data and manufactured samples that demonstrate the capabilities and limitations of this new graphical representation. This innovation, used alongside existing tools, contributes to increased confidence of analysts when facing challenging applications.

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