Free Water Knock Outs

(Oil Skimmer Vessel)

Typically horizontally oriented, a Free-Water-Knock-Out is a three-phase vessel designed to handle a large amount of water with a small amount of oil.  By removing large volumes of water with an FWKO, downstream equipment can be sized for a smaller water to oil ratio, thereby reducing heat and chemical requirements.

Free-Water-Knock-Outs are normally placed near the beginning of a facility so that the downstream equipment does not have to be sized based on the large water volume.

12:eleven Free Water Knock Outs


  • ASME Code or Built to Code but not Stamped
  • Horizontal
  • Sizes range from 6’ x 20’  to 10’ x 40’
  • Pressure Ratings:  75#, 125#, 250#, and 500#
  • Cold Weather options like Insulating the FWKO
  • Bare Vessels to Turn Key Package Solutions

Internals Options

  • An array of Inlet diverters
  • Spill over Baffles
  • Wave Breakers (optional upgrade)
  • Inlet Cyclones
  • Vortex Breakers

What You Need to Know About

Free Water Knock Outs

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