Corrosion rate at different liquid velocity. 3

[DeepakBalu]

Does corrosion rate will be fast or slow during the below liquid flow conditions,
1. Continues flow of liquid
2. Slow velocity of liquid
3. static condition of liquid

Consider the liquid is SOUR SERVICE.

 

[SJones]

Have a play with this:

http://www.corrosioncenter.ohiou.edu/software/freecorp/

and see what the effect of varying flow rate is.

Dependent upon what else is in the fluid, for example solids, differing degradation mechanisms might come into play with the differing velocities. These different mechanisms could potentially cause reversal of corrosion rate values that would be predicted for CO2-H2S corrosion: say, MIC becomes active under stagnant conditions, it could produce a corrosion rate much higher than that of CO2 corrosion under moderate flow. Temperatures also have an effect on corrosion rates and these will alter with the change in flow rates.

Not a simple question to answer on an internet forum.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[DeepakBalu]

Thank you Jones.

 

[EdStainless]

On what base material? It greatly depends on the passive films that form.
If they are soft and can erode then higher velocity will remove more metal (steel and Cu).
If they are hard then high velocity won't matter (SS, Ni, Ti).
Stagnant conditions are usually worse, biofilms, fouling, oxygen depletion, and all sorts of other bad stuff can significantly change the type of corrosion that you see.

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P.E. Metallurgy, Plymouth Tube