On the selection of corrosion margin during design
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The general corrosion margin is related to the medium and operating conditions. But how can one determine the corrosion rate of the medium, and what is the relationship between them? Is it acceptable to choose any value for the corrosion margin during design?
The corrosion rate of conventional materials can be found in various manuals, which can serve as a reference for design purposes. However, the corrosion rate of specific materials must be determined through testing. The design margin for corrosion is calculated as the uniform corrosion rate multiplied by the design life; if pitting corrosion is a possibility for the material, an additional margin should be applied.
Choose according to the corrosion manual, or based on the requirements of the process
Ullig’s Corrosion Manual. There is also a software available now: the CSP corrosion analysis and prediction software, distributed by a company in Beijing. If it’s a design institute, you might consider having the management buy a set.
Thank you. It’s not from a design institute; let’s see if I can find it online
Is it true that any amount of corrosion margin can be chosen during design? Of course not; that would cost money... It depends on experience, on the conditions of corrosion, on the service life, and on the environment... It’s not as simple as just designing something; in short, it’s very complex