Slug Catcher

A Slug Catcher is used to collect liquids that have settled in flow lines which can overload the gas/liquid handling capacity of the plant especially during pigging operations.

Exterran’s Slug Catcher helps protect your valuable production equipment from abrupt large bursts of liquids entering your gas stream. It is typically used downstream of pipeline and pigging operations where large volumes of liquid can collect in the pipeline and are pushed through in a short time. The unit has a liquid level controller and liquid outlet control valve, as well as a crash dump connection. This connection allows you the option of adding a crash level controller and secondary liquid outlet to dispose of sudden large slugs.

Key Benefits


  • Helps protect your downstream equipment and pipelines from damaging liquids
  • Efficiently manages high liquid volumes generated from pigging
  • Precision machined mist extractor boosts efficiency
  • Optional crash level controller and secondary outlet to handle slug overload
  • Reduce downtime and maintain production with our proven pre-engineered design


  • Engineered lifting lugs for ease of installation
  • Latest ASME design and construction standards help ensure high performance and safety
  • Large in-stock inventory and quick delivery allows faster startup


  • Added assurance of a warranty on manufactured products that runs 12 months from startup or 18 months from delivery, whichever comes first
  • Prompt, professional service, support and spare parts from local technicians in or near every major oil & gas producing region in the U.S. and numerous areas around the world

How it Works

The production stream first encounters the inlet diverter, which causes initial separation of gas from liquid. The heavier liquid descends while the gas rises. In the open area of the vessel, the stream slows even further and the larger liquid particles fall from the gas. Next the high efficiency mist extractor captures smaller liquid particles entrained in the gas. If a large liquid slug enters the system, an optional dump valve is triggered to quickly handle the sudden influx. Liquids exit the bottom of the vessel and the natural gas exits the top.

Standard Features & Options

Standard Features

  • Level controller and liquid outlet
  • Crash dump level control connection
  • Crash dump liquid outlet connection
  • Thermal pressure relief valve
  • Sight glass/level gauges with gauge cocks
  • High efficiency vane mist extractor
  • Liquid level controller
  • Liquid outlet control valve
  • Pressure indicator with isolating valve
  • Temperature indicator connection
  • Instrument gas supply drip pot with high and low pressure regulators
  • Liquid drain connection
  • Instrument gas header including high and low pressure regulators
  • Engineered lifting lugs for safe handling
  • High quality enamel paint system
  • ASME code stamped and National Board registration


  • Crash dump level controller
  • Crash dump liquid outlet control valve
  • API 14C rated
  • High and low level controls
  • Skid mounted with drain pan
  • Manways and cleanouts
  • Carbide trim
  • Sour gas service designed and built to NACE standards
  • Customization to meet additional specifications