Limitations

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NORSOK M-506
CO2 Corrosion Models

5. NORSOK M-506 Corrosion Prediction model
The NORSOK M-506 corrosion rate model calculates the CO 2 corrosion rate on basis of given
temperature, pH, CO2 partial pressure and shear stress
This model is valid for temperature 5 – 150 °C, pH 3.5 – 6.5.
CO2 Partial pressure 0.1 – 10 bar and shear stress 1 – 150 Pa.
The model is not applicable when H2S partial pressure is higher than 0.5 bar or when the ration
between partial pressure of CO2 and H2S is less than 20.
The model can lead to under-prediction of the corrosion rate when the total content of organic acids
exceeds 100 and the CO2 partial pressure is less than 0.5 bar.

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