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51312-01531-Top-of-the-Line Corrosion in The Presence of Hydrocarbon Co-Condensation in Flowing Condition

Picture for Top-of-the-Line Corrosion in The Presence of Hydrocarbon Co-Condensation in Flowing Condition
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Product Number: 51312-01534-SG
ISBN: 01534 2012 CP
Author: Thunyaluk Pojtanabuntoeng
Publication Date: 2012
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During the transportation of wet gas temperature gradient between internal pipeline and outside environment leads to the condensation of water vapor. Freshly condensed water is greatly corrosive and can lead to Top-of-the-Line Corrosion (TLC). However a certain fraction of hydrocarbons will co-condense along with water vapor and form two immiscible liquids with a different wettability and different corrosivity. Corrosion tests in the absence and presence of hydrocarbon co-condensation were conducted. Hot vapor of water and n-heptane saturated with CO2 were generated and transported through a one-inch condenser with 2 carbon steel samples located at the inlet and outlet. Condensation took place on the inner surface representing top of the line corrosion. Corrosion rate was evaluated by weight loss method. Expectedly in the absence of co-condensation corrosion rates increased with water condensation rates. In the presence of n-heptane water condensation rates had less influence on the corrosion rates. Iron carbonate was observed in co-condensation scenario but not in pure water system suggesting the change of the chemistry in condensed water.
During the transportation of wet gas temperature gradient between internal pipeline and outside environment leads to the condensation of water vapor. Freshly condensed water is greatly corrosive and can lead to Top-of-the-Line Corrosion (TLC). However a certain fraction of hydrocarbons will co-condense along with water vapor and form two immiscible liquids with a different wettability and different corrosivity. Corrosion tests in the absence and presence of hydrocarbon co-condensation were conducted. Hot vapor of water and n-heptane saturated with CO2 were generated and transported through a one-inch condenser with 2 carbon steel samples located at the inlet and outlet. Condensation took place on the inner surface representing top of the line corrosion. Corrosion rate was evaluated by weight loss method. Expectedly in the absence of co-condensation corrosion rates increased with water condensation rates. In the presence of n-heptane water condensation rates had less influence on the corrosion rates. Iron carbonate was observed in co-condensation scenario but not in pure water system suggesting the change of the chemistry in condensed water.
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