Top-of-Line Corrosion Control in Large Diameter Wet Gas Pipelines

Large diameter subsea pipelines are being used across the world for wet gas transportation over significant distances from<br>offshore fields to onshore facilities. The ability to predict and control corrosion is necessary to ensure long term integrity of<br>these pipelines. Large diameter wet gas lines operating in stratified flow pose unique challenges for top of the line corrosion<br>which occurs when corrosive gases are found dissolved in condensed water at the top of the pipe. This paper will discuss a<br>study undertaken by ExxonMobil and RasGas to establish a mechanistic understanding of sour top of the line corrosion and<br>the operational guidelines developed to control its occurrence.