Evaluate the cause of reduced capacity in a TEG dehydration system

M. H. Sheilan, Amine Experts Inc., Calgary, Alberta, Canada; and R. H. Weiland, Optimized Gas Treating Inc., Houston, Texas Moving gas from offshore production platforms to onshore processing facilities via a subsea pipeline usually requires that steps are taken to prevent the formation of hydrocarbon and gas hydrates. Preventive measures include: the addition of methanol (CH3OH), monoethylene glycol (MEG) or diethylene glycol (DEG) to the gas before transmission; and the removal of water to a concentration outside the hydrate formation region by absorbing water into triethylene glycol (TEG), usually in a packed absorber situated on the production platform. Here, a case study is presented