Wellhead Allocation Assembly

Exterran's Wellhead Allocation Assembly is skid mounted, with three phase operation to measure and recombine water, oil and gas to transport to a central gathering facility. Available in 36 OD x 10’-0" s/s x 1440# horizontal bucket and weir style.

Key Benefits


  • Latest ASME design and construction standards help ensure higher performance
  • Fully NACE (MR-O175) compliant
  • Complete with all piping, valves and controls plumbed to skid edge
  • Can be used as test or production separator
  • In-stock inventory and quick delivery allow fast startup


  • Added assurance of a warranty on our 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 deflector, which causes initial separation of gas from liquid. The heavier liquid descends while the gas rises. In the second stage the stream slows even further and the larger liquid particles fall from the gas. Next the mist extractor captures smaller liquid particles entrained in the gas. Liquids exit the bottom of the vessel and the natural gas exits the top.

The gas exits the separator through a senior orifice fitting with back pressure control and piped to skid edge. The oil and water outlet exits the separator through separate control valves and turbine meters. The gas and liquids can be piped separately or comingled.

Standard Features & Options

Standard Features

  • Fully NACE (MR-O175) compliant
  • Senior orifice fitting
  • Oil and water turbine meters
  • High and low level switch bridles
  • Gas back pressure valve
  • Full flow pressure relief valve
  • Sight glass/level gauges with gauge cock
  • Liquid level controllers
  • Pressure indicator
  • Temperature indicator connection
  • Instrument gas supply drip pots with piping manifold
  • High and low pressure regulators
  • Lifting lugs for safe handling
  • ASME standards in design and construction
  • Skid mounted assembly


  • API 14C rated
  • Coriolis Liquid Meters
  • Manway
  • Carbide trim
  • Paint System
  • Customization to meet additional specifications