ACFM is a noncontact technique to detect and size surface-breaking, crack-like defects through coatings up to a thickness of 0.200 inches. HMT uses this method to detect crack-like defects in tank shell-to-bottom welds, tank bottom lap welds, sumps, nozzle and appurtenance welds, and Stress Corrosion Cracking (SCC) in ethanol service. A benefit to the ACFM method is that surface preparation is reduced compared to other NDE techniques.

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