In TEG dehydration unit, the water existing in natural gas is being removed. The gas from the wells is water saturated, i.e. in water dew point status. This water would cause some problem in downstream facilities. Some of these problems are as follows:

• Icing and blockage of downstream equipment and lines in low temperatures due to hydrate and ice formation.
• Acidic corrosion in equipment in the presence of acidic gases such as Hydrogen Sulfide and Carbon Dioxide.

With respect to the mention problems and according to existing standards, the water content in the gas shall not be more than a certain value. In dehydration unit, by absorbing water from natural gas using TEG, dew point of the gas depending on the downstream process, transferring pipeline temperature, etc. would be adjusted.