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New UT Techniques for HTHA Detection – Lessons From the Field

Picture for New UT Techniques for HTHA Detection – Lessons From the Field
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Product Number: 51321-16320-SG
Author: Casper Wassink/Frederic Reverdy/Guillaume Neau/Olivier Roy
Publication Date: 2021
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$20.00
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HTHA occurs in an environment containing hydrogen and high temperatures. High temperatures change the atomic form of hydrogen to form methane bubbles into the steel which can turn into cracks. Refinery owners have started additional inspections for HTHA after the component failure that was not anticipated. However, HTHA defects are very small and difficult to detect with conventional ultrasonic testing or other volumetric NDT methods. Recently, new UT techniques have been proposed, including FMC/TFM, TOFD and PAUT. They have been applied in the field and improved based on the experience gained. In this paper, FMC/TFM ultrasonic technique for HTHA inspection will be presented. Data on a component, removed from the field, will be shown and cross-referenced with information from field examination and follow-up investigations. Conclusions will be drawn on the level of success in identifying HTHA correctly.

HTHA occurs in an environment containing hydrogen and high temperatures. High temperatures change the atomic form of hydrogen to form methane bubbles into the steel which can turn into cracks. Refinery owners have started additional inspections for HTHA after the component failure that was not anticipated. However, HTHA defects are very small and difficult to detect with conventional ultrasonic testing or other volumetric NDT methods. Recently, new UT techniques have been proposed, including FMC/TFM, TOFD and PAUT. They have been applied in the field and improved based on the experience gained. In this paper, FMC/TFM ultrasonic technique for HTHA inspection will be presented. Data on a component, removed from the field, will be shown and cross-referenced with information from field examination and follow-up investigations. Conclusions will be drawn on the level of success in identifying HTHA correctly.

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