Corrosion Study of Carbon Steel in the Presence of Monoethylene Glycol (MEG) and Corrosion Inhibitors in Acid

摘要

A study to investigate the influence of monoethylene glycol (MEG) on inhibition of corrosion in acid CO_2 saturated conditions in wet gas pipelines (carbon steel) was performed. MEG is a thermodynamic hydrate inhibitor. The quest for energy encourages more offshore gas development and operation. The integrity of the entire pipeline for the transportation of gas from source to process facilities onshore is very important. With the conditions encountered in the transportation of gas, severe corrosion can occur on the pipeline without proper inhibition. This paper describes the efforts in preventing the corrosion of the gas pipelines in the presence of MEG using commercially-available corrosion inhibitors and discusses the corrosion inhibition mechanisms. The effect of under-dosing of the inhibitor is also highlighted.