Fast identification of O2 corrosion in economiser tubes

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

doi:10.1016/j.engfailanal.2011.07.014

Fast identification of O₂ corrosion in economiser tubes

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

Research output: Journal Publication › Article › peer-review

4 Citations (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 language	English
Pages (from-to)	2201-2210
Number of pages	10
Journal	Engineering Failure Analysis
Volume	18
Issue number	8
DOIs	https://doi.org/10.1016/j.engfailanal.2011.07.014
Publication status	Published - Dec 2011
Externally published	Yes

Keywords

Boiler failure
Economiser tube
Metallography
Pitting corrosion

ASJC Scopus subject areas

General Materials Science
General Engineering

Access to Document

10.1016/j.engfailanal.2011.07.014

Cite this

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title = "Fast identification of O2 corrosion in economiser tubes",

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.",

keywords = "Boiler failure, Economiser tube, Metallography, Pitting corrosion",

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doi = "10.1016/j.engfailanal.2011.07.014",

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T1 - Fast identification of O2 corrosion in economiser tubes

AU - Qua, Hock Chye

AU - Khaw, Chwin Chieh

AU - Tan, Ching Seong

AU - Wang, Xin

AU - Ooi, Jong Boon

PY - 2011/12

Y1 - 2011/12

N2 - 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.

AB - 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.

KW - Boiler failure

KW - Economiser tube

KW - Metallography

KW - Pitting corrosion

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