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NACE TR34109-2023, Crude Distillation Unit—Distillation Tower Overhead System Corrosion

This technical report describes the associated corrosion mechanisms in refinery crude distillation unit (CDU) distillation tower overhead systems and current industry practices for mitigating or controlling this corrosion. Distillation towers in a typical CDU include a pre-flash tower, an atmospheric tower, and a vacuum tower. Feedstock, unit configurations, and associated process variables are addressed, from the crude oil storage tanks to the distillation tower overhead drums.

Product Number: NACE TR34109-2023
Publication Date: 2023
$109.00
$109.00
$109.00

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This technical report describes the associated corrosion mechanisms in refinery crude distillation unit (CDU) distillation tower overhead systems and current industry practices for mitigating or controlling this corrosion. Distillation towers in a typical CDU include a pre-flash tower, an atmospheric tower, and a vacuum tower. Feedstock, unit configurations, and associated process variables are addressed, from the crude oil storage tanks to the distillation tower overhead drums.

Keywords: crude, distillation unit, distillation tower

This technical report describes the associated corrosion mechanisms in refinery crude distillation unit (CDU) distillation tower overhead systems and current industry practices for mitigating or controlling this corrosion. Distillation towers in a typical CDU include a pre-flash tower, an atmospheric tower, and a vacuum tower. Feedstock, unit configurations, and associated process variables are addressed, from the crude oil storage tanks to the distillation tower overhead drums.

Keywords: crude, distillation unit, distillation tower

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Assessment of Ammonium Chloride Corrosion in Refinery Crude Distillation Unit Overhead Conditions

Product Number: 51324-21131-SG
Author: H. Li; Y. Yoon; Russell D. Kane
Publication Date: 2024
$40.00
The corrosion in crude unit overhead systems, specifically related to acidic attack and under-deposit corrosion caused by salt formation, has been extensively documented in both industry and literature. However, the absence of comprehensive corrosion data correlating critical environmental and flow variables has posed challenges in evaluating corrosion and selecting appropriate materials. To address this issue, a Joint Industry Program (JIP) was conducted with the primary objective of generating engineering data on the corrosion behavior of commonly used construction materials in atmospheric overhead systems of refinery crude distillation units (CDU-OH). The study focused on investigating the effects of HCl, NH3, NH4Cl, H2O, and H2S in the presence of ammonium chloride, aiming to identify key parameters associated with three prevalent forms of corrosion: under-deposit, water dew point, and aqueous corrosion. Through meticulous thermodynamic modeling and corrosion evaluations performed in simulated environments that accurately represented relevant conditions, the impact of these key parameters on the corrosion of six frequently used materials of construction—namely, carbon steel, 410 stainless steel, Alloy 400, Titanium, Alloy 625, and Alloy C-276—was rigorously evaluated. The corrosion rates of these materials under various test conditions were quantified, leading to the development of a corrosion prediction model. This model serves as a valuable tool for determining conditions for ammonium chloride-induced corrosion in CDU-OH systems, aiding in the assessment and decision-making processes pertaining to material selection.