Fast identification of O2 corrosion in economiser tubes

Hock Chye Qua, Chwin Chieh Khaw, Ching Seong Tan, Xin Wang, Jong Boon Ooi

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

Failure investigation was conducted on three tube samples via visual/metallographic examination and analysis of operational history. The investigation employed a fast-identification approach, which allowed a shorter down time and faster production recovery after tube failure. Visual and metallographic evidence showed 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.

Original languageEnglish
Pages (from-to)2201-2210
Number of pages10
JournalEngineering Failure Analysis
Volume18
Issue number8
DOIs
Publication statusPublished - Dec 2011
Externally publishedYes

Keywords

  • Boiler failure
  • Economiser tube
  • Metallography
  • Pitting corrosion

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