CO2 Corrosion Rate Calculator
PROde Waard-Milliams model with pH and velocity corrections.
Input Parameters
log(CR) = 5.8 − 1710/(T+273) + 0.67×log(PCO2) — de Waard-Milliams (1975)
Corrosion Assessment
Corrosion Rate
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mpy (mils/year)
Severity
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Pipe Life
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years
mm/year
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Base CR (no corrections)
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mpy
pH Factor
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Velocity Factor
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Corrosion Mitigation Recommendations
Corrosion Rate vs Temperature
How this was calculated
de Waard-Milliams (1975): log(CR) = 5.8 - 1710/(T+273) + 0.67*log(PCO2), where CR in mm/yr, T in °C, PCO2 in bar.
pH correction: For pH > 4, apply factor = 10^(0.32*(pH-4)). Higher pH reduces corrosion rate.
Velocity correction: Factor = (V/1)^0.8. Higher velocity increases mass transfer and corrosion.
Severity thresholds: Low <1 mpy, Moderate 1-5 mpy, High 5-10 mpy, Severe >10 mpy.
Pipe life: Wall thickness (mils) / CR (mpy), with 80% allowable corrosion.
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