Cameron's triethylene glycol (TEG) dehydration systems are among the most widely used in the oil and gas sector because of low operating costs and relatively low CAPEX. Glycol dehydration systems are not only efficient at removing water from a natural gas stream, but they also remove benzene, toluene, ethylbenzene and xylene (BTEX) and other volatile organic compounds.
In natural gas systems, water vapor needs to be removed to reduce pipeline corrosion and eliminate line blockage caused by hydrate formation. The water dew point needs to be below the lowest pipeline temperature to prevent free-water formation.
If acid gases are removed by amine treatment, then the gas will be water saturated and will need to be dehydrated before entering the pipeline. Most product specifications require the maximum quantity of water in the gas to be 4 to 7 lb/MMcf of gas.