chapter  5
Glycol dehydration
Pages 50

The glycol dehydration unit is extensively used in the oil and gas industry to produce dehydrated gas. The saturated gas, if left without treatment, can cause major problems, including:

• Hydrate formation • Water dropouts that can cause an excessively corrosive environment

if CO

and H

S are present • Ice formation • Excess water vapor that will reduce the heating value of the gas • Two-phase flow (due to water dropouts) that can lead to pres-

sure-drop problems

Normally, the gas is dehydrated to a moisture level of 65 mg/Sm

(sometimes, a higher value of 127 mg/Sm

is used). Two commonly used methods to dehydrate the gas are:

• Using solid desiccant: commonly used desiccants are silica gel, activated alumina, molecular sieve, etc.