DP35 Dewpoint System

Exterran’s DP35 Dew Point System efficiently removes water and liquid hydrocarbons from produced natural gas so it can be transported and sold down the pipeline. Our plant design expertly integrates a series of components that cover processing needs from beginning to end, including compression and stabilizing equipment that readies the extracted liquids for trucking to their final destinations. The system handles flow rates over 35 MMscfd depending upon the gas conditions, and customized designs are available to meet other throughput requirements.

Key Benefits

Faster Startup

  • Reduced manufacturing times with inventories of key components and finished standard products
  • Smaller footprint allows for faster, lower cost installation
  • QuickStart® (use same link as in all other places)

Value Performance

  • Expertise to re-rate the design for optimal performance and backed by a process guarantee
  • We use only high-quality components such as Fisher® control valves, Rosemount® transmitters & Allen-Bradley® ControlLogix PLCs®
  • Capacity margin for fluctuations in gas volume and composition


Inlet gas is cooled in a gas/gas exchanger and gas chiller. Ethylene glycol is injected during the process to inhibit formation of gas hydrates. The condensed hydrocarbon liquid, glycol and water are separated from the chilled gas in the cold separator, which includes a mist eliminator to minimize entrainment and a liquid-liquid plate pack that assists separation. The cold gas returns to gas exchanger to remove heat from the inlet gas. An outlet pressure control valve regulates the residue gas before flowing to the battery limits, maintaining cold separator pressure.

Liquid hydrocarbon overflows an internal weir to a surge section while the glycol exits through a boot. The liquid hydrocarbon cross exchanges with stabilizer bottoms and then throttles to stabilizer tower pressure. The stabilizer is a packed fractionation tower with a hot oil reboiler. The liquid is cooled upon exiting the stabilizer bottoms exchanger. A stabilizer overhead vapor compressor recompresses the gas to inlet gas pressure and then cools it to approximately 120°F with air in a discharge cooler. The cooled, compressed gas flows back to the inlet of the gas/gas exchanger to recombine with the inlet gas.

Standard Features & Options

  • Four Stacked Process Modules
  • Hot Oil System
  • Gas & Liquid Heat Exchange & Gas Chiller
  • Cold Separator & Stabilizer
  • Mechanical Refrigeration
  • Ethylene Glycol Injection & Regeneration
  • Skid Edge Junction Box Compatible with any Control System
  • Allen-Bradley ControlLogix® Programmable Logic Controller (PLC) and Wonderware® Human Machine Interface (HMI) workstations

Standard Modules

  • Chiller Skid
  • Gas / Gas Exchanger Skid
  • Reboiler Skid
  • Condenser Skid
  • Hot Oil System Skid
  • Refrigeration Compressors


  • Power Distribution Center (PDC)
  • Refrigerant Economizer Condensate Storage & Load Out Systems With Metering
  • Inlet Residue Gas Meters
  • Fuel Gas Meter
  • Inlet Filter Separator Silica Gel for Removal of Water & C5+

Optional Services

  • Installation Engineering
  • Exterran Quickstart®
  • Process Safety Management (PSM) Documentation
  • Air Emissions Permitting
  • HAZOP Support
  • Build, Own & Operate
  • Build, Operate & Transfer