Abstract
Horseshoe pit formation and wall thinning due to flow-accelerated corrosion of high-pressure turbine extraction pipes was studied in this investigation. The corroded pipes from extraction line of a power plant show extensive pitting in the vicinity of socket-welded joints. Pitted surfaces were characterized for damaged surface morphology and pits distribution. Corroded pipes experienced severe pitting in flow downstream in the vicinity of weld joints where decrease in local pit size and increase in pit density were observed at locations a way from the weld joints.
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2015. NACE International
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