Following gas separation and dehydration, high-pressure gas enters the JT unit through the heat exchanger for cooling. The natural gas stream then passes through a JT valve causing a pressure drop and undergoes a process called “adiabatic expansion.” This means that the gas is expanding in a system where energy can neither enter nor exit. With the energy stable, the temperature of the gas must drop to offset the pressure drop, this is called the Joule-Thompson (JT) effect.
Next, the cooled gas is routed to the separator to remove the NGL. The outlet gas from the separator is routed through the gas/gas exchanger for inlet cooling and to warm up the sales gas. The NGL from the separator is routed to a separate, optional pressurized NGL storage tank or to a NGL pipeline.
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