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Crude unit overhead corrosion — pH profile and corrosion rate of carbon steel under controlled condensation / D. L. N. Cypriano in Materials and corrosion, Vol. 61 N° 11 (Novembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 11 (Novembre 2010) . - pp. 955–960 Titre : Crude unit overhead corrosion — pH profile and corrosion rate of carbon steel under controlled condensation Type de document : texte imprimé Auteurs : D. L. N. Cypriano, Auteur ; J. A. C. Ponciano, Auteur ; H. C. M. Jambo, Auteur Année de publication : 2011 Article en page(s) : pp. 955–960 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Hydrochloric  acid;  inhibitor;  integrity  program;  neutralizers;  overhead  corrosion Résumé : For this paper a laboratory simulation of the crude unit overhead corrosion was conducted. The main variable that impacts the corrosion rates for pipes, heat exchangers, and drums that compound the overhead system is pH. To control this pH many companies use different kinds of neutralizers, trying to keep in an optimum range, determined for each unit, according to their own characteristics. For this study an apparatus that simulate the evaporation and subsequent condensation of a solution with hydrochloric acid and other with neutralizer, with five carbon steel coupons analyzed by metal mass-loss was used. To compare to field practices, three kinds of neutralizer solutions were used. It was possible to observe differences between the pH profiles along condensation, which certainly influences the corrosion rate from the first condensed solution until the last one. It can be compared with the process at the atmospheric tower, from the overhead pipe, passing by the condenser until the drum that accumulates sour water at the end. In this last one the pH is usually measured, but it cannot represent what we could observe with this laboratory apparatus, that the first solution condensed is the worst for corrosion, and that there is a direct relationship between them. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905509/abstract [article] Crude unit overhead corrosion — pH profile and corrosion rate of carbon steel under controlled condensation [texte imprimé] / D. L. N. Cypriano, Auteur ; J. A. C. Ponciano, Auteur ; H. C. M. Jambo, Auteur . - 2011 . - pp. 955–960. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 11 (Novembre 2010) . - pp. 955–960 Mots-clés : Hydrochloric  acid;  inhibitor;  integrity  program;  neutralizers;  overhead  corrosion Résumé : For this paper a laboratory simulation of the crude unit overhead corrosion was conducted. The main variable that impacts the corrosion rates for pipes, heat exchangers, and drums that compound the overhead system is pH. To control this pH many companies use different kinds of neutralizers, trying to keep in an optimum range, determined for each unit, according to their own characteristics. For this study an apparatus that simulate the evaporation and subsequent condensation of a solution with hydrochloric acid and other with neutralizer, with five carbon steel coupons analyzed by metal mass-loss was used. To compare to field practices, three kinds of neutralizer solutions were used. It was possible to observe differences between the pH profiles along condensation, which certainly influences the corrosion rate from the first condensed solution until the last one. It can be compared with the process at the atmospheric tower, from the overhead pipe, passing by the condenser until the drum that accumulates sour water at the end. In this last one the pH is usually measured, but it cannot represent what we could observe with this laboratory apparatus, that the first solution condensed is the worst for corrosion, and that there is a direct relationship between them. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905509/abstract