Steel Absorbs Gas Like a Sponge

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High Temperature Hydrogen Attack (HTHA) is a problem in the fertiliser industry and others when bubbles of methane form in steel. I use Non Destructive Testing (ultrasonic scanning) to see them. Here's why it happens.

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USCSB video about the Tesoro's Anacortes Refinery: https://www.youtube.com/watch?v=8vPaQYM-tWs

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