When large dew-point depressions are required, specialized dehydration systems using highly concentrated glycol will be necessary. If limited space is available, special systems may be used to achieve the required dew point depressions. Normal dehydration systems with TEG glycol purity of are capable of achieving dew point depressions up to 70 F. Stripping gas may be used to obtain higher dew point depressions. Vacuum-operated glycol units can achieve glycol purities of up to but are rarely used because of:.
