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07443 Stress Assisted Corrosion in Boiler Tubes - Failure Analysis

Picture for 07443 Stress Assisted Corrosion in Boiler Tubes - Failure Analysis
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Stress assisted corrosion (SAC) is a major concern for kraft recovery boilers in the pulp and paper industry. A water leak can cause a smelt-water explosion in the boiler. A number of carbon steel tubes showed a deep decarburized layer on the inner surface (water-touched) and also an unusually large grain size at the inner tube surface.

Product Number: 51300-07443-SG
ISBN: 07443 2007 CP
Author: Preet M. Singh, Steven J. Pawel, Dong Yang, and Jamshad Mahmood
Publication Date: 2007
Industry: Process Industries
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Stress assisted corrosion (SAC) of carbon steel boiler tubes is one of the major causes of waterside failure in industrial boilers. SAC is a major concern for kraft recovery boilers in the pulp and paper industry as any water leak into the furnace can cause a smelt-water explosion in the boiler. Failed carbon steel boiler tubes from different kraft recovery boilers were examined to understand the role of carbon steel microstructure on crack initiation and SAC crack morphology. A number of carbon steel tubes showed a deep decarburized layer on the inner surface (water-touched) and also an unusually large grain size at the inner tube surface. SAC cracks were found to initiate in these areas with large-graineddecarburized microstructure. Tubes without such microstructure were also found to have SAC cracks. It was found that the decarburization and large grained microstructure may facilitate initiation and growth but is not necessary for SAC of carbon steel boiler tubes.

Key Words: Stress Assisted Corrosion, Carbon Steel, Boiler Tubes, Corrosion Fatigue

Stress assisted corrosion (SAC) of carbon steel boiler tubes is one of the major causes of waterside failure in industrial boilers. SAC is a major concern for kraft recovery boilers in the pulp and paper industry as any water leak into the furnace can cause a smelt-water explosion in the boiler. Failed carbon steel boiler tubes from different kraft recovery boilers were examined to understand the role of carbon steel microstructure on crack initiation and SAC crack morphology. A number of carbon steel tubes showed a deep decarburized layer on the inner surface (water-touched) and also an unusually large grain size at the inner tube surface. SAC cracks were found to initiate in these areas with large-graineddecarburized microstructure. Tubes without such microstructure were also found to have SAC cracks. It was found that the decarburization and large grained microstructure may facilitate initiation and growth but is not necessary for SAC of carbon steel boiler tubes.

Key Words: Stress Assisted Corrosion, Carbon Steel, Boiler Tubes, Corrosion Fatigue

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Picture for 07444 STRESS RELATED BOILER FAILURES
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07444 STRESS RELATED BOILER FAILURES

Product Number: 51300-07444-SG
ISBN: 07444 2007 CP
Author: J. J. Dillon, P. B. Desch, and S.H.M. Vrijhoeven
Publication Date: 2007
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Picture for 07450 FAILURE ANALYSIS AND INVESTIGATION METHODS FOR BOILER TUBE FAILURES
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07450 FAILURE ANALYSIS AND INVESTIGATION METHODS FOR BOILER TUBE FAILURES

Product Number: 51300-07450-SG
ISBN: 07450 2007 CP
Author: Mehrooz Zamanzadeh, Edward S. Larkin, George T. Bayer, and William J. Linhart
Publication Date: 2007
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Failure analysis methodology is applied to the principal mechanisms by which boiler tubes fail during service.  sThe failure analysis procedure, or methodology for evaluation, is provided in a step by step approach.  Among the case histories discussed are: fatigue, erosion, short-term overheating, and hydrogen damage.
Picture for 07447 CORROSION AND STRESS RELATED BOILER TUBE FAILURES CASE HISTORIES
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07447 CORROSION AND STRESS RELATED BOILER TUBE FAILURES CASE HISTORIES

Product Number: 51300-07447-SG
ISBN: 07447 2007 CP
Author: E. M. Labuda, D. A. Cline, and E. H. Hull,
Publication Date: 2007
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