Failure Investigation of an In-service Steam Boiler
American Journal of Mechanical and Materials Engineering
Volume 1, Issue 3, September 2017, Pages: 69-77
Received: Apr. 25, 2017; Accepted: May 25, 2017; Published: Jul. 10, 2017
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Authors
Okpala Alexander Nwachukwu, Department of Mechanical Engineering, Niger Delta University, Wilberforce Island, Nigeria
Burubai Woyengi-Ebinipre, Department of Agricultural & Environmental Engineering, Niger Delta University, Wilberforce Island, Nigeria
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Abstract
Failure investigation was carried out on a refinery steam boiler had a history of good performance with few leakages and damages that were successfully weld repaired. The steam boiler tubes were observed to have developed several perforations / punctures on numerous furnace chamber tubes, twenty two years after commissioning. In the course of the investigation, background data and history of failure were collected with available photographic evidences, visual examination, low magnification examination, chemical analysis, SEM analysis, EDS analysis, macrostructure examination, microstructure examination, tensile test hardness and micro-hardness tests. It was concluded that the failure of the tubes were due to upsets in the water chemistry that has promoted caustic gouging from ID at localized places. Adjustments to boiler water chemistry which should be made to maintain strict congruent phosphate pH control was then recommended.
Keywords
Caustic, Gouging, Perforations, Steam, Boiler, Tubes, Microstructure
To cite this article
Okpala Alexander Nwachukwu, Burubai Woyengi-Ebinipre, Failure Investigation of an In-service Steam Boiler, American Journal of Mechanical and Materials Engineering. Vol. 1, No. 3, 2017, pp. 69-77. doi: 10.11648/j.ajmme.20170103.12
Copyright
Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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