Condensation of water in wet gas pipelines can cause top of line corrosion when the water
condensation rate is high or acetic acid is present in the gas. For CO2 dominated systems the top of
line corrosion is limited by the amount of iron which can be dissolved in the water condensing in the
top of the pipeline. When acetic acid is present in the gas in addition to CO2 the solubility of iron in
the condensed water is increased, and this increases the top of line corrosion. Fluid flow model
simulations have shown that different approaches for pipeline insulation can give widely different
water condensation rates. Application of a top of line corrosion prediction model has demonstrated
that such variations in water condensation rates can have a much larger effect on the top of line
corrosion rate than variation in the CO2 partial pressure.