Introduction to OLI Studio: Corrosion Analyzer for First-Time Users

Table of Contents

Objective

Overview

Stability (Pourbaix) Diagrams

Elemental Iron in Water A simple stability diagram for iron in pure water

Interpreting the Diagram: A guide on how to read and understand the stability diagram

Elemental Iron in Sour Water: Introducing hydrogen sulfide into the water stream and analyzing its impact

Stainless Steel 316 Stability Diagram: A more complex stability diagram for a common industrial alloy

Corrosion Rates

Basic Corrosion Rate Calculation

Gas Condensate Corrosion Calculations Using Pipe Flow

Conclusion

References

Disclaimer: The user interface, calculations, and results displayed in this article are from OLI Studio: Corrosion Analyzer Version 12.0.0. Other software versions may appear different or present slightly distinct results due to continual developments in the software and thermodynamic databanks.

Objective

This article is designed to introduce new users to the OLI Corrosion Analyzer, highlighting its intuitive interface and reliable predictions. We'll break down the essential features of the tool, showing how it simplifies the complex process of analyzing corrosion in various industrial settings. By the end, you’ll know how to use the OLI Corrosion Analyzer to improve your corrosion management, minimize downtime, and protect your assets. This guide gives you the confidence and skills to utilize this powerful tool fully.

Overview

The OLI Corrosion Analyzer consists of two main components:

• Stability Diagrams: Also known as Pourbaix Diagrams, these diagrams help predict how metals and their compounds behave in different environments by considering temperature, pressure, and chemical composition. They show you the conditions under which metals remain stable, corrode, or passivate, helping you determine where your materials are safe and where they might be at risk. (See OLI's take on Marcel Pourbaix's work: Reference 1)

• Corrosion Rates: This feature calculates how quickly materials might corrode under specific conditions. It also helps predict localized corrosion, such as pitting or crevice corrosion, and shows how different factors like temperature, pressure, and fluid flow can affect corrosion rates. This tool is essential for understanding how your materials will perform over time. (For more information, see  Reference 2.)

Stability (Pourbaix) Diagrams

To get started, you will find short videos below demonstrating how to create stability diagrams in the OLI Corrosion Analyzer.

Elemental Iron in Water: A simple stability diagram for iron in pure water

Interpreting the Diagram: A guide on how to read and understand the stability diagram

Elemental Iron in Sour Water: Introducing hydrogen sulfide into the water stream and analyzing its impact

Stainless Steel 316 Stability Diagram: A more complex stability diagram for a common industrial alloy

Corrosion Rates

Historically, the corrosion rate model in the OLI Corrosion Analyzer is based on OLI's traditional thermodynamic framework called AQ. This framework has been used to calibrate corrosion rates for various alloys, including stainless steel, carbon steel, and specialty alloys.

Alloys available in AQ framework:

We have introduced corrosion rates for the MSE thermodynamic framework in Version 12 of the OLI Corrosion Analyzer program.

Alloys available in MSE framework:

We will continue to add more alloys to the MSE corrosion rate framework in future releases.

Important Note: Starting in Version 12, the default framework is MSE. If your metallurgy isn't supported in MSE, you must switch back to the AQ framework.

Basic Corrosion Rate Calculation

Watch this video to learn how to set up a basic corrosion rate calculation using Carbon Steel G10100, a generic material.

Gas Condensate Corrosion Calculations Using Pipe Flow

In this example, we’ll look at a gas-sweetening plant case study where corrosion is a concern. The plant uses diethanolamine to neutralize acid gases like CO2 and H2S. As these gases cool and condense, they can become highly corrosive. The video will guide you through calculating the dew point temperature, removing the condensed water, and determining the corrosion rate, including how factors like fluid velocity affect the results.

Conclusion

The OLI Corrosion Analyzer is a powerful and user-friendly solution for professionals facing complex corrosion challenges across various industries. By offering detailed stability diagrams and accurate corrosion rate predictions, the software empowers users to make informed decisions to enhance corrosion management strategies, reduce downtime, and safeguard asset integrity.

This introductory guide empowers first-time to quickly grasp the tool's functionalities, enabling them to harness its full potential. Users can expect even greater accuracy and expanded capabilities as the software evolves with new versions and updates, making OLI Corrosion Analyzer an indispensable asset in their corrosion analysis toolkit.

References

Reference 1

A. Anderko, S. J. Sanders, R. D. Young; Real-Solution Stability Diagrams: A Thermodynamic Tool for Modeling Corrosion in Wide Temperature and Concentration Ranges. CORROSION 1 January 1997; 53 (1): 43–53. doi: https://doi.org/10.5006/1.3280432)

Reference 2

Anderko, Andrzej M., Robert D. Young, and Patrice McKenzie. "Computation of rates of general corrosion using electrochemical and thermodynamic models." NACE CORROSION. NACE, 2000.