After the liquid (free) water has been removed from the gas stream by separation, 25 to 120 lbs of water per MMSCF of gas will remain, depending on the temperature and pressure of the gas.
The warmer the inlet gas and the lower the pressure, the more water vapor the gas stream will contain .
Normally, between 20 to 115 lbs of water per MMSCF of gas must be removed before the required dew point of the gas is met.
The schematics below show the flow through a typical glycol dehydration system. The glycol dehydration process can be discussed in two parts: