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51315-6010-Crude Unit Overhead Corrosion Control Successfully Driven by Ionic Modeling

Picture for Crude Unit Overhead Corrosion Control Successfully Driven by Ionic Modeling
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Product Number: 51315-6010-SG
ISBN: 6010 2015 CP
Author: Kathleen Armistead
Publication Date: 2015
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As the understanding of the causes of corrosion in crude unit overheads has rapidly evolved over the past decade so have overhead modeling capabilities. The industry has grown over time from recognizing severe corrosion due to hydrochloric acid (HCl) concentrated at the Water Dew Point (WDP) then to the discovery of the Salt Point (SP) and eventually to calculations of a distinct ionic Dew Point (iDP) and its composition. Current ionic modeling technology allows for the calculation of these three key points and simultaneously considers contributions of all ionic species present in the overhead and their impact on corrosion. This paper will discuss the evolution of overhead modeling capabilities and case histories where modeling was used to drive successful overhead corrosion control.
As the understanding of the causes of corrosion in crude unit overheads has rapidly evolved over the past decade so have overhead modeling capabilities. The industry has grown over time from recognizing severe corrosion due to hydrochloric acid (HCl) concentrated at the Water Dew Point (WDP) then to the discovery of the Salt Point (SP) and eventually to calculations of a distinct ionic Dew Point (iDP) and its composition. Current ionic modeling technology allows for the calculation of these three key points and simultaneously considers contributions of all ionic species present in the overhead and their impact on corrosion. This paper will discuss the evolution of overhead modeling capabilities and case histories where modeling was used to drive successful overhead corrosion control.
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Crude unit overhead systems contain complex mixtures of hydrocarbon water and various ionic species. Ionic modeling has been used to better understand the rapidly changing phase behavior in this system and to shed some light on some factors which may influence corrosion.
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11360 Corrosion in Crude Distillation Unit Overhead Operations: A Comprehensive Review

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 The purpose of this paper will be to: (a) review published literature to characterize and classify speciation related to the types of impurities encountered in opportunity crudes; and (b) describe and categorize published case studies of corrosion in crude unit overhead operations.
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