CNG Flare Gas Capture Unloader

Units Min Max
Flow Rate (Output) mscfd 1,000 4,000
Inlet Pressure psig 3,600
Outlet Pressure psig 20 420
Ambient Temp oF -40 120
H2S Content ppm n/a 5

CNG Flare Gas Capture Unloader Packaging

  • Custom Enclosure: LxWxH = 37’ x 6’ x 13’ (Height adjustable to 8’ for transport)
  • Weight: 15,000 lbs
  • Designed for continuous operations in harsh winter conditions
  • Entire package rated for Class 1 Division 2
  • Bruest Catalytic heater – 1.4 MMBTU/Hr Peak Heat Input
  • No external instrument air or nitrogen supply required.
  • Power gas system with auxiliary catalytic heaters, to power onboard I/P valves.
  • Single connection of 85A at 480V/3P electrical utility required. Normal operation pulls less than 20A.
  • Auxiliary storage vessels to sustain operation of catalytic heaters without connected CNG trailer.


CNG Flare Gas Capture Unloader Safety


  • PLC for automatic control of entire unit and monitoring of pressure and temperatures. Includes easy-to-use touch screen interface.
  • Control of pressures, heater firing, and flow rates allows for reliable control and avoidance of outlet
  • Gas temperatures below material limits.
  • One (1) red mushroom buttons ESD (emergency shutdown devices) external to the enclosure.
  • Standard compressor package protections including


CNG Flare Gas Capture Unloader Specification


  • March 30, 2014 Flare Gas Capture – Unloader Version: 00
  • Hi/low pressure trip
  • Hi/low temperature trip
  • Passive over-pressure protection
  • Emergency Shutdown (Trip) Mode: Shuts power to unit and shuts in all flow.


CNG Flare Gas Capture Unloader Compliance


  • ASME B31.3
  • ASME Section VIII Div I Latest Edition
  • Class I Division 2
  • ND State Electric Board