Removal of Water Vapor

In the preceding sections the removal of liquefiable hydrocarbons is discussed. The basic processes used for this removal of hydrocarbons invariably result in the removal of water vapors. Technical Data used in the field explained in petroleum courses in Islamabad. Experience has shown that the water-vapor dew point of the gas leaving the low temperature separator in these processes is from 10 to 12°F below LTS temperature for systems not using hydrate inhibitors and from 20 to 40°F below LTS temperature for systems using hydrate inhibitors.

Dew point depressions for selective adsorption systems will be discussed further, and the use of liquid desiccants will be covered for the field of gas dehydration in this section. To understand water-vapor dew point and dew point depression better, As was explained, this curve shows the saturation conditions for water vapor in natural gas. The water dewpoint temperature is the same as the saturation temperature for a given pressure. Assume that gas is flowing into a dehydration unit at 1,000 psia and 100°F and that it must be dehy drated to 7 lbm water/MMscf gas to meet contract specifications. At 1,000 psia and 100°F the gas contains 62 Ibm of water. The inlet water-vapor dewpoint temperature is 100°F. From the chart for 1,000 psia and 7 lbm water/MMscf the outlet water-vapor dewpoint temperature is 33°F. The dehydrator must be capable of producing a 67°F dew point depression and removing 55 lbm water /MMscf gas. Some more details of petroleum courses in Islamabad are as under.

Condensate is fractionated by the same process used in the system described. The light components pass overhead as vapor, and the stable product is withdrawn from the bottom of the tower. The bottom product is cooled in a heat exchanger either by the cold gas from the low-temperature separator or by cooling water. Overhead gas may be used for fuel and supply gas. If the volume warrants, it may be recompressed for sales gas. Heat is supplied with an indirectly fired salt-bath heater. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join petroleum courses in Rawalpindi.