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Question 7:

In the glycol dehydration process, identify how the solution flows through the contactor.

A - Lean glycol solution flows down through the contactor counter current to the wet gas stream B - Rich glycol solution flows down through the contactor concurrent to the wet gas stream C - Lean glycol solution flows upward through the contactor in the same direction as the wet gas stream D - Lean glycol solution flows down through the contactor concurrent to the dry gas stream Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 8:

Dewpoint depressions of 72°C to 78°C are possible with glycol dehydrators using TEG and the high concentration glycol regenerators.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 9:

Liquid desiccants must fulfill all of the following requirements when used in drying natural gas except:

A - High vapour pressure B - High affinity for water C - Ability to be regenerated D - Low viscosity Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 10:

When discussing the glycols used in gas dehydration, ethylene glycol (EG) is not:

A - Used where greater amounts of dew point depression are required B - The least expensive of the glycols used in dehydration C - The most hygroscopic of the glycols used in dehydration D - Prone to higher vapour losses than diethylene glycol (DEG) Correct Answer(s): A Marked as: Incorrect Question 1:

Dewpoint depressions of 72°C to 78°C are possible with glycol dehydrators using TEG and the high concentration glycol regenerators.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 2:

Preventive dehydration controls the moisture content in gas by injecting certain inhibitors or chemicals, which:

A - Reduces the sulphur content of the acid gas B - Reduces the pressure at the injector ports C - Lowers the freezing point of the water D - Lowers the corrosiveness of the gas Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 3:

In the glycol dehydration plant the lean glycol solution flows downward concurrent to the wet gas stream in the:

A - Accumulator B - Still column C - Contactor D - Reboiler Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 4:

In the glycol regeneration section of a TEG plant, with the stripper:

A - Water-rich vapour from the reboiler rises in intimate contact with descending glycol-rich liquid from the absorber B - Glycol-rich vapour from the reboiler rises in intimate contact with descending water-rich liquid from the absorber C - Water-rich vapour from the absorber rises in intimate contact with descending glycol-rich liquid from the reboiler D - Water-rich vapour from the reboiler descends in intimate contact with rising glycol-rich liquid from the absorber Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 5:

An operator wishes to increase the dew point depression from 30°C to 36°C on a plant's TEG dehydration unit. The action required to reach this is:

A - Increase reboiler temperature B - Decrease gas flow rate C - Increase circulation of glycol D - Reduce operating pressure in absorber Correctness Rule: Single Correct Answer Required Correct Answer(s): A Marked as: Incorrect _______________________________________________

Question 6:

In the regeneration section of a TEG dehydration plant the rising water-rich vapour is in intimate contact with the descending glycol in the:

A - Separator B - Surge tank C - Contactor D - Stripper column Correctness Rule: Single Correct Answer Required Correct Answer(s): D Marked as: Incorrect _______________________________________________

Question 7:

If the inlet gas to a glycol dehydrator contactor is at constant pressure, the higher the temperature is:

A - The water content of the natural gas will remain the same B - The lower the water content of the natural gas will be C - The higher the dewpoint depression of the natural gas will be D - The higher the water content of the natural gas will be Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 8:

In the regeneration section of the TEG plant, the reboiler temperature requirements are:

A - Dependent on the design limits of the reflux equipment B - Higher than in a DEG plant C - The same as in a DEG plant D - Lower than in a DEG plant Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 9:

In the glycol dehydration process, identify how the solution flows through the contactor.

A - Lean glycol solution flows down through the contactor concurrent to the dry gas stream B - Lean glycol solution flows upward through the contactor in the same direction as the wet gas stream C - Lean glycol solution flows down through the contactor counter current to the wet gas stream D - Rich glycol solution flows down through the contactor concurrent to the wet gas stream Correctness Rule: Single Correct Answer Required Correct Answer(s): C Marked as: Incorrect _______________________________________________

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