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Natural gas must be dehydrated to remove water vapor. Water vapor causes the formation of hydrates, over saturation of natural gas, and corrosion of equipment. Hydrates are solid, ice-like crystallized compounds formed of hydrocarbons and water. Hydrate formation occurs in high pressure well streams with a low temperature. Hydrates can form, however, at temperatures above the freezing point.

The high pressure increases saturation and creates more water vapor. Hydrates cause freezing and blocking of pipelines, valves, and other equipment, bringing production to a halt. Oversaturated gas does not meet pipeline specifications of 7 pounds per mmcfd, which must be removed in order to sell.

The temperature and pressure determine whether water is in a gaseous state or has condensed into a liquid. When in liquid form, water also causes corrosion to equipment. In order to prevent these harmful effects, gas is dehydrated by being condensed from vapor into liquid form and then removed by either adsorption or absorption.


1. Glycol Dehydration: liquid chemical system used for the removal of water from natural gas and NGLs. It is the most commonly used system, also known as a TEG unit.

2. Desiccant Dehydration: Hygroscopic substance that induces or sustains a state of dryness. It is the safest and most eco-friendly option. CROFT uses this form of dehydration with the Passive Dehydration System, also known as a PDS unit.


1.   Absorption: occurs when the water vapor is taken out by a dehydrating agent. This is the type of dehydration is used by Glycol units. CROFT’s TEG uses this process to dehydrate natural gas.

2. Adsorption: occurs when the water vapor is condensed and collected on the surface. CROFT’s PDS uses this process to dehydrate natural gas.