Advances in Engineering Advances in Engineering features breaking research judged by Advances in Engineering advisory team to be of key importance in the Engineering field. Papers are selected from over 10,000 published each week from most peer reviewed journals.
Hock-Chye Qua, Chwin-Chieh Khaw, Ching-Seong Tan, Xin Wang, Jong-Boon Ooi
Engineering Failure Analysis, July 2011
Abstract
Failure investigation was conducted on three tube samples via visual/metallographic examination and analysis of operational history. The investigation employs a fast-identification approach, which allows a shorter down time and faster production recovery after tube failure. Visual and metallographic evidence show that the tube samples had suffered from abnormally high wastage at the external and internal surfaces; the latter surface, in addition had suffered from deep pitting. Analysis of operational history confirmed the presence of dissolved O2 in the feedwater. It was concluded that leakage was primarily caused by tube thinning from internal wastage/pitting, aggravated by external wastage.
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