Three-Phase Separator
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Three-Phase Separator Calculator

Oil-Water-Gas Design per API 12J

Three-Phase Separator Sizing (Oil/Water/Gas)
Size horizontal or vertical three-phase separators using API 12J and GPSA methodology. Calculates gas capacity (Souders-Brown), oil-water separation with settling velocity (Stokes Law), retention times for both liquid phases, weir/bucket sizing, and interface level control requirements.

Flow Rates

Operating Conditions

Leave blank to auto-calculate

Liquid Properties

Produced water typically 1.01-1.07

Design Parameters

Typical: 2-5 min for oil
Typical: 3-10 min for water

📚 Learn the Theory

Understand oil/water separation, Stokes settling, interface control, weir design, and emulsion handling

Read Engineering Guide →

Quick Reference

  • Oil Retention: 2-5 min typical
  • Water Retention: 3-10 min typical
  • L/D Ratio: 3:1 to 5:1 (horiz)
  • Interface Height: 40-60% of diameter
  • Oil Pad: Min 6" for weir overflow

Frequently Asked Questions

What is a three-phase separator?

A three-phase separator separates a well stream into oil, water, and gas phases, typically used in oil and gas production facilities.

What methodology does this three-phase separator calculator use?

This calculator sizes three-phase separators using API 12J methodology with retention time and settling calculations.

What inputs are needed to size a three-phase separator?

You need gas and liquid flow rates, fluid densities, operating pressure and temperature, and retention time requirements for oil-water separation.

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