Failure analysis of a superheater tube of a coal-fired power plant

Failure analysis of structures has gained a considerable interest in many engineering areas. The aim of this research is to determine the root cause of the structural failures which can reduce the failure risks and prevent similar failures in the future. This thesis presents experimental investigati...

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Main Author:	Reis Piedade, Salustiano Dos
Format:	Thesis
Language:	English English English
Published:	2008
Subjects:	TJ268-740 Steam engineering
Online Access:	http://eprints.uthm.edu.my/2226/1/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%20declaration.pdf http://eprints.uthm.edu.my/2226/2/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%2024p.pdf http://eprints.uthm.edu.my/2226/3/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%20fulltext.pdf
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spelling	my-uthm-ep.22262021-10-31T04:35:51Z Failure analysis of a superheater tube of a coal-fired power plant 2008-06 Reis Piedade, Salustiano Dos TJ268-740 Steam engineering Failure analysis of structures has gained a considerable interest in many engineering areas. The aim of this research is to determine the root cause of the structural failures which can reduce the failure risks and prevent similar failures in the future. This thesis presents experimental investigations for the failure of a superheater tube of a coal-fired power plant using several failure analysis procedures. The failure analysis comprised of visual inspection, optical microscopic, scanning electron microscopy combined with the energy dispersive X-ray spectroscopy (EDS) and energy dispersive X-ray diffraction (EDXD). A sample of a total-fractured superheater tube obtained from an industry was used in this investigation. Initial visual investigations found that the superheater tube had a longitudinal crack. This fracture appearance is called fish mouth stress rupture. The specimen was initially cut, mounted, grinded, polished and etched. A significant oxide layer of 1.75mm in thickness was occurred in the steam side surface. The optical microscopy and scanning electron microscopy were used to identify intergranular cracks, voids, elongated grain and deposit layers. The EDS and EDXD were used to identify types and compositions of the oxide substances. The results revealed that the steam and fire side surfaces consist of sodium iron oxide, hematite and magnetite. The study also demonstrates that the superheater tube of a coal-fired failed due to creep mechanism. This resulted inoverheating problem inside the tube; caused by deposit layers, which contributes to the creep mechanism. Periodically cleaning and maintenance should be done in order to avoid accumulation of deposit layers. 2008-06 Thesis http://eprints.uthm.edu.my/2226/ http://eprints.uthm.edu.my/2226/1/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%20declaration.pdf text en staffonly http://eprints.uthm.edu.my/2226/2/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%2024p.pdf text en public http://eprints.uthm.edu.my/2226/3/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%20fulltext.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Faculty of Mechanical and Manufacturing Engineering
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TJ268-740 Steam engineering
spellingShingle	TJ268-740 Steam engineering Reis Piedade, Salustiano Dos Failure analysis of a superheater tube of a coal-fired power plant
description	Failure analysis of structures has gained a considerable interest in many engineering areas. The aim of this research is to determine the root cause of the structural failures which can reduce the failure risks and prevent similar failures in the future. This thesis presents experimental investigations for the failure of a superheater tube of a coal-fired power plant using several failure analysis procedures. The failure analysis comprised of visual inspection, optical microscopic, scanning electron microscopy combined with the energy dispersive X-ray spectroscopy (EDS) and energy dispersive X-ray diffraction (EDXD). A sample of a total-fractured superheater tube obtained from an industry was used in this investigation. Initial visual investigations found that the superheater tube had a longitudinal crack. This fracture appearance is called fish mouth stress rupture. The specimen was initially cut, mounted, grinded, polished and etched. A significant oxide layer of 1.75mm in thickness was occurred in the steam side surface. The optical microscopy and scanning electron microscopy were used to identify intergranular cracks, voids, elongated grain and deposit layers. The EDS and EDXD were used to identify types and compositions of the oxide substances. The results revealed that the steam and fire side surfaces consist of sodium iron oxide, hematite and magnetite. The study also demonstrates that the superheater tube of a coal-fired failed due to creep mechanism. This resulted inoverheating problem inside the tube; caused by deposit layers, which contributes to the creep mechanism. Periodically cleaning and maintenance should be done in order to avoid accumulation of deposit layers.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Reis Piedade, Salustiano Dos
author_facet	Reis Piedade, Salustiano Dos
author_sort	Reis Piedade, Salustiano Dos
title	Failure analysis of a superheater tube of a coal-fired power plant
title_short	Failure analysis of a superheater tube of a coal-fired power plant
title_full	Failure analysis of a superheater tube of a coal-fired power plant
title_fullStr	Failure analysis of a superheater tube of a coal-fired power plant
title_full_unstemmed	Failure analysis of a superheater tube of a coal-fired power plant
title_sort	failure analysis of a superheater tube of a coal-fired power plant
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Faculty of Mechanical and Manufacturing Engineering
publishDate	2008
url	http://eprints.uthm.edu.my/2226/1/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%20declaration.pdf http://eprints.uthm.edu.my/2226/2/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%2024p.pdf http://eprints.uthm.edu.my/2226/3/SALUSTIANO%20DOS%20REIS%20PIEDADE%20-%20fulltext.pdf
_version_	1747830927481896960

Failure analysis of a superheater tube of a coal-fired power plant

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