Gas Production Unit (GPU)

WellFlex system for well stream flow control, pressure, temperature, and helping removing liquids from gas prior to further processing or pipeline delivery. The base unit includes a gas-fired indirect heater and a horizontal or vertical two or three-phase separator mounted on a skid, with operation-ready instrumentation and piping that allow quick well hookup. Units are available in single, dual and quad configurations for cost-saving, multi-well service. Enclosed units are also available for reliable operation in cold-weather climates.

Typical configurations include:


  • Line heater with one separator
  • Line heater with two separators; one high pressure, one low pressure
  • Two separators (high and low pressure


  • Heater
  • two sets of coils
  • two high-pressure separators


  • Two heaters each with two sets of coils
  • four high-pressure separators

Standard Features

  • Heavy-duty steel heater shell
  • Interchangeable and removable firetube
  • Interchangeable and removable split coil per API 12K
  • Removable flame arrestor
  • Removable stack
  • Long nose adjustable choke
  • High temperature shutdown with thermowell
  • Temperature indicators with thermowells
  • Temperature controller with thermowell
  • ASME code-stamped, 250 psig fuel gas scrubber with internal high level shutdown valve
  • Fuel gas manifold with preheat coil and high and low pressure regulators
  • Line heater built in accordance with API 12K
  • Interchangeable two or three-phase separators
  • Liquid level controllers
  • Liquid outlet control valves
  • Pressure gauges with isolation valve
  • Relief valves
  • ASME code stamped separator and National Board registration
  • Heavy-duty oilfield skid


  • Gas metering
  • Liquid metering
  • Two or three-phase separator
  • High/low pressure shutdown
  • High/low liquid level shutdown
  • Burner management system (BMS)
  • Low voltage facility shut down system
  • Solar power for BMS and low voltage shutdown
  • Removable stack arrestor
  • Alternative coil configurations
  • Up to 15,000 psig MAWP coil design
  • Fire safety fusible plug system
  • Cold weather enclosure
  • Sour gas service designed and built to NACE standards
  • Customization to meet additional specifications