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08433 Analysis of Steam Superheater Tube Failures of Medium Pressure Boilers

Picture for 08433 Analysis of Steam Superheater Tube Failures of Medium Pressure Boilers
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Product Number: 51300-08433-SG
ISBN: 08433 2008 CP
Author: Veronica A. Dominguez, Roberto Tedesco, and Pablo G. Peña
Publication Date: 2008
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This paper describes the analysis of recurrent failures experienced on 1%Cr – ½%Mo steam superheater tubes of two boilers at an oil refinery. In all cases, metallurgical analysis of failed tubes has shown overheating of material, high temperature oxidation, bulging, cracks and creep degradation as a result of internal deposits on tube wall. Chemical analysis of deposits samples has determined the presence of sodium sulfate attributable to boiler water carryover to the superheater. To determine the root cause, a comprehensive assessment of actual boiler conditions was carried out, considering operation variables and procedures, maintenance and inspection programs, combustion and control system modifications. On the basis of this assessment, an integral program was implemented to improve boiler reliability.
This paper describes the analysis of recurrent failures experienced on 1%Cr – ½%Mo steam superheater tubes of two boilers at an oil refinery. In all cases, metallurgical analysis of failed tubes has shown overheating of material, high temperature oxidation, bulging, cracks and creep degradation as a result of internal deposits on tube wall. Chemical analysis of deposits samples has determined the presence of sodium sulfate attributable to boiler water carryover to the superheater. To determine the root cause, a comprehensive assessment of actual boiler conditions was carried out, considering operation variables and procedures, maintenance and inspection programs, combustion and control system modifications. On the basis of this assessment, an integral program was implemented to improve boiler reliability.
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08436 Boiler Tube Failures and Integrity Assessment

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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

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Author: Mehrooz Zamanzadeh, Edward S. Larkin, George T. Bayer, and William J. Linhart
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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 08437 Failure Analysis and Investigation Methods for Boiler Tube Failures II: Additional Case Histor
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08437 Failure Analysis and Investigation Methods for Boiler Tube Failures II: Additional Case Histories

Product Number: 51300-08437-SG
ISBN: 08437 2008 CP
Author: Mehrooz Zamanzadeh, Edward S. Larkin, George T. Bayer, and William J. Linhart
Publication Date: 2008
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