Performance of the unit to achieve the specified dew point of the sales gas (cold separator temperature) is dependent on:
Be advised that a JT unit is sensitive to inlet gas temp. The performance guarantee for hydrocarbon dew point is only valid up to the maximum inlet temperature given to DPC when sizing the unit for the specific lease. If the inlet gas temperature rises above the design temperature, the sales gas dew point specification may not be achieved. Contact DPC if this occurs, or is anticipated to occur for assistance in troubleshooting the installation.
The standard DPC JT unit is provided with a pressure controller to set the JT valve to the required upstream pressure. If the transporting pipeline varies widely in pressure, provision must be made to stabilize either the differential pressure across the skid/JT valve, or to stabilize the units outlet pressure.
DPC provides a hot gas bypass and valve on the JT unit to assist in thawing the unit, or it can be used to reduce process temperature temporarily until pressure control can be stabilized.
The DPC Mini JT unit was specifically engineered to operate in the 200 to 1,000 MSCFD range. Due to the small size, DPC worked hard to reduce the costs associated with this unit and thus the Mini JT does not have the same instrumentation as the larger DPC units.
Contact DPC for assistance, if needed, on any of the above issues.
Lessee is expected to provide proper overpressure safety system protection to prevent pressuring the DPC unit above 1440 psig. DPC provides an inlet gas safety relief valve connection for the Lessee’s use, if needed. The relief valve supplied by DPC is only designed for thermal relief protection.