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TOL corrosion is reported to occur in large diameter wet gas pipeline in stratified flow conditionsdue to low fluid velocities1. With increasing distance from the inlet, the wet gas pipeline becomescooler as it loses heat to the environment. Such cooling causes water, hydrocarbon, and otherhigh vapor pressure species to condense on the pipe wall. The upper part of the pipe willconstantly be supplied with freshly condensed water while the less corrosive water saturatedwith corrosion products will be drained along the pipe wall to the bottom of the line.
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Top-of-Line Corrosion (TLC) is a practical but costly problem for unprocessed natural gas transport. Utilizing multiphase pipelines instead of processing the well-fluids offshore has required massive modeling development to control hydrate formation and corrosion. At the inlet of the pipelines, the gas, and other well fluids have much higher temperatures than the pipelines' outside environment, e.g., cold ocean water or river water.