Characteristics Of Natural Gas Practice Test

What happens to water removed during dehydration before it is sent to refining or sale?

Water is removed from gas and glycol is regenerated by heating. Water is removed and then added back. Water is converted to steam in the pipeline. Water remains in gas to help prevent hydrates.

Correct Answer:

Water is removed from gas and glycol is regenerated by heating.

Explanation:

In glycol dehydration, water is removed from the gas by contacting it with lean glycol that absorbs the water. The water-rich glycol is then sent to a regenerator where it is heated, which drives off the absorbed water as vapor. The regenerated (lean) glycol is cooled and returned to the absorber to dry more gas. This regeneration step is essential to keep the drying process continuous and to ensure the gas meets requirements before refining or sale. The water isn’t reintroduced to the gas, isn’t turned into steam in the pipeline, and water isn’t left in the gas to prevent hydrates.

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