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Refrigeration Units DPC leases an all electric refrigeration unit that was designed to meet the needs of the upstream production industry. These units have become very popular due to their ease of operation and installation, high downturn and low operating costs. They have an operating range from 60° to -10°F.
The refrigeration process skid consists of a gas-to-gas heat exchanger, a gas-to-chilled water heat exchanger, a two phase separator and an electrically pumped methanol distribution and injection system. The process skid is simple and very straight-forward. Field pumpers find the unit very user-friendly.
DPC refrigerates by circulating a chilled water and ethylene glycol mixture. The chiller unit controls process temperature by precisely controlling the circulating water temperature. Each DPC chilled water unit operates with multiple compressors and a minimum of two isolated refrigeration circuits. A PLC controls the starting and loading of the multiple compressors and condenser fans. Each compressor loads in either 1/3 increments or by sliding vane or by variable frequency drive. The system includes a hot gas bypass, variable speed condenser fans and louvers for winter operation in cold climates. At extreme low load conditions, the entire chilled water unit will shut down and then self-start as needed. The unit has built in phase and power outage protection and is set to self-start five minutes after continuous restoration of power after a clean power outage. All motor starters are included on the chilled water unit. The unit requires a single electric feeder drop with adequate over current protection.
DPC leases three standard sizes of refrigeration units:
Chilled water units are matched to the requirements of the refrigeration application. They all require 460 volt, three phase, 60 hertz power. The following are standard DPC sizes and require the associated electrical service size and maximum over current protection (actual power requirements are some 15% lower than the figures shown below).
The refrigeration process skids in the picture above has three heat exchangers. This unit was designed to handle hot gas downstream of a compressor discharge. The multiple heat exchanges reduce the chilled water unit size and lowers the overall expense of conditioning the gas stream. DPC supplies large hydrocarbon conditioning stations by operating multiple units in parallel. The picture below shows a 200 MMSCFD pipeline station.
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