JT (Joule-Thomson) Assembly

The JT assembly provides hydrocarbon dew point control and increased recovery of natural gas liquids (NGL). The JT Plant consists of a gas-to-gas heat exchanger with hot gas bypass, liquid-to-gas heat exchanger, JT valve, cold separator, methanol injection system and control system, all mounted on a single skid.

The Joule-Thomson Assembly makes it easy for you to recover valuable NGL and reduce the water and hydrocarbon dew point of your production stream to pipeline specifications. This self-contained, skid-mounted system can be quickly installed and started up, making it ideal for short-term, space-constrained operating environments.

Key Benefits

  • Expedited production drawings available as early as 4-5 business days for faster planning
  • Single well or multi well designs available along with full pad well designs
  • Robust skid design and commitment to service help bring operations online quickly
  • Cost-effective maintenance
  • Installation and commissioning of the units to facilitate and speed startup
  • Industry-leading delivery to speed startup

How it Works

The assembly consists of a gas/gas exchanger with hot gas bypass, JT valve, cold separator, methanol injection system and control system.

Following gas/liquid separation and gas dehydration, high-pressure gas enters the assembly through the gas/gas exchanger and chiller for pre-cooling. Methanol is injected to prevent formation of hydrates, and the raw natural gas passes through a JT valve. The resulting pressure drop causes expansion of the gas and a significant temperature reduction due to the Joule-Thompson effect.

The cooled gas is routed to the cold separator to remove the condensed NGL. The outlet gas from the cold separator is routed through the gas/gas exchanger for inlet cooling. The NGL from the cold separator is routed through the inlet NGL/gas exchanger and then to a separate optional pressurized NGL storage tank.

Standard Features & Options

Standard Features

  • JT valve with pressure pilot controller
  • NGL/gas exchanger
  • ASME code gas/gas exchanger
  • ASME code -20 °F cold separator
  • Temperature controller
  • Instrument gas/air manifold
  • Sight glass assembly
  • Methanol pump and delivery system
  • Cold thermal insulation
  • Hot gas bypass system for startup
  • Heavy-duty steel skid with lifting lugs
  • Thermal relief valves


  • Upstream Dehydration
  • Hairpin exchangers
  • Control isolation valves
  • Ethylene glycol injection system
  • NGL bullet tank
  • 3-phase separator
  • Unit leasing

JT (Joule-Thomson) Assembly

Tech Sheets

File Name A4 Letter
JT-Assembly-English Download PDF