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51316-7188-Failure Analysis and Investigation Methods of Boiler Tubes Corrosion/Case Study

Picture for Failure Analysis and Investigation Methods of Boiler Tubes Corrosion/Case Study
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The purpose of this study is to investigate the effect of amount of oxygen on corrosion rate of steam loop. Consequently, to eliminate failure, more effective steam quality monitoring concept is recommended.

Product Number: 51316-7188-SG
ISBN: 7188 2016 CP
Author: hajatolah almasi
Publication Date: 2016
Industry: Process Industries
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The observation of corrosion on interior tube side of depropaniser Reboiler, stabilizer Reboiler, low pressure, high pressure steam condenser, air cooler, steam drum and pipe of boiler during gas refinery plant shut down, leads to have a survey of steam loop condition. Borescopic inspection images in boiler, depropaniser Reboiler and air cooler tube were the same, so it can be concluded that the corrosion mechanism probably is the same. Since observed pitting on tubes reveals sign of oxygen corrosion, the oxygen concentration of generated steam and condensate steam were investigated. Obtained results provided evidences for exceeded levels of oxygen at steam loop. During the survey, boiler feed water chemistry was also checked in order to evaluate its potentiality to assure reliable function of the boiler. The purpose of this study is to investigate the effect of amount of oxygen on corrosion rate of steam loop. Consequently, to eliminate failure, more effective steam quality monitoring concept is recommended.

Keyword: downloadable, corrosion, Reboiler, steam, oxygen, tube

 

The observation of corrosion on interior tube side of depropaniser Reboiler, stabilizer Reboiler, low pressure, high pressure steam condenser, air cooler, steam drum and pipe of boiler during gas refinery plant shut down, leads to have a survey of steam loop condition. Borescopic inspection images in boiler, depropaniser Reboiler and air cooler tube were the same, so it can be concluded that the corrosion mechanism probably is the same. Since observed pitting on tubes reveals sign of oxygen corrosion, the oxygen concentration of generated steam and condensate steam were investigated. Obtained results provided evidences for exceeded levels of oxygen at steam loop. During the survey, boiler feed water chemistry was also checked in order to evaluate its potentiality to assure reliable function of the boiler. The purpose of this study is to investigate the effect of amount of oxygen on corrosion rate of steam loop. Consequently, to eliminate failure, more effective steam quality monitoring concept is recommended.

Keyword: downloadable, corrosion, Reboiler, steam, oxygen, tube

 

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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.
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08436 Boiler Tube Failures and Integrity Assessment

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07443 Stress Assisted Corrosion in Boiler Tubes - Failure Analysis

Product Number: 51300-07443-SG
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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.
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