Menu
Search
Filters
Close
Menu

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

Picture for Assessment of Ammonium Chloride Corrosion in Refinery Crude Distillation Unit Overhead Conditions
Available for download
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.
Product Number: 51324-21131-SG
Author: H. Li; Y. Yoon; Russell D. Kane
Publication Date: 2024
$40.00
$40.00
$40.00
Product tags
Also Purchased
Picture for 10360 Description and Explanation of an FCC Overhead System Unexpected Corrosion
Available for download

10360 Description and Explanation of an FCC Overhead System Unexpected Corrosion

Product Number: 51300-10360-SG
ISBN: 10360 2010 CP
Author: Matthieu Devallée
Publication Date: 2010
$20.00

Case study: A leak occurred in a Fluid Catalytic Cracking unit main fractionator overhead line elbow in June 2006. Following this leak, investigations showed acidic corrosion-erosion in the overhead circuit. This type of corrosion was unexpected in this circuit.
Picture for Considering Mass Transfer in Refinery Crude Distillation Overhead Water Wash
Available for download

Considering Mass Transfer in Refinery Crude Distillation Overhead Water Wash

Product Number: 51323-18757-SG
Author: Joel E. Lack
Publication Date: 2023
$20.00

This paper proposes a theory for how a successful water wash achieves salt corrosion control, the mass-transfer considerations driving this process and how popular practices may contribute to or hinder successful outcomes.
Picture for Real Time Sour Water Corrosion Prediction for Fluid Catalytic Cracking Overhead System
Available for download

Real Time Sour Water Corrosion Prediction for Fluid Catalytic Cracking Overhead System

Product Number: 51323-18785-SG
Author: H. Li, P. Constantineau, C. Zhuang, Y. H. Hou
Publication Date: 2023
$20.00

Crude feed often contains contaminants / heavy amounts of sulfur compounds that may degrade equipment or even the finished product. These sulfur and nitrogen compounds react with hydrogen to form hydrogen sulfide (H2S) and ammonia (NH3) within certain units and can lead to formation of ammonium bisulfide salts (NH4HS) when cooled. NH4HS salts may lead to plugging, and if wet, rapid under deposit corrosion can occur. Hence, water washing ahead of NH4HS salt formation is essential to prevent wet salt corrosion and ensure safe unit operations.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support