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Pulsed Eddy Current Testing

Pulsed eddy current testing (PECT) has moved into an exciting period. New equipment offerings have entered the market, an ISO standard (ISO, 2017) for the technique has been issued, and advanced applications of the technology are being developed. The main strength of PECT is its ability to inspect carbon steel through insulation commonly covering pipes and vessels. Its main limitation is that PECT measures steel thickness averaged over a large area of the test specimen, called the “footprint.” This implies PECT can detect general wall loss, but not localized corrosion. History has shown that vendors and practitioners have sometimes overlooked this drawback, which inevitably results in failures and disappointments. But dismissing the technology altogether because of its footprint averaging would be missing great opportunities.


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