51313-02255-Optimization of Passivation and Cooling Water Treatment of Brass Alloys in Petrochemical Facilities

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Product Number: 51313-02255-SG

ISBN: 02255 2013 CP

Author: Li Yan

Publication Date: 2013

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Real-world plant experience along with a series of laboratory experimental studies is being used to optimize NOVA Chemicals corporate cooling water program. All aspects of the program are being considered including passivation treatments for individual bundles system pre-film solutions and long-term cooling water chemistries. The aim of the optimization plan is to select the best combination of passivation pre-film and cooling water solutions that provides the most cost-effective protection of the system within defined performance targets that the vendor must deliver.
This paper will present results of electrochemical laboratory studies designed to provide an understanding of how each part of the program functions. The focus in this paper will be on the pre-film and passivation of brass (Naval) heat exchangers with various azole-based inhibitors. For pre-film formation the protectiveness of the passive film is studied at varying temperatures pH and concentrations of inhibitors from different vendors. The passivation and protection of yellow metal with various inhibitors are examined in a phosphate-containing cooling water. In addition the effect of chloride in cooling water on inhibiting efficiency of azole-based brass inhibitors will be discussed.