© 2015 VGO, Inc. (503) 239-6000 | info@vgoinc.com | www.vgoinc.com 1 Case Study: Failure Analysis of Sulfuric Acid Supply Line Introduction VGO Testing & Inspection Engineers was retained by an industrial client to determine the cause of failure of a 1-inch diameter carbon steel pipe used to convey 93% sulfuric acid to a demineralizer in the steam plant. The client reported that the line, which was thought to be several years old, failed by developing a hole at an elbow between the discharge pump at the acid supply tank and an automatic valve which controls the flow to the demineralizer. Several months earlier, the same line reportedly developed another leak, downstream of the current failure. VGO’s client indicated that the acid flow through the line was interm

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