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Oil-Gas Separator Sizing Calculator
Size two-phase oil-gas separators using gas velocity and liquid retention time methods. Calculate minimum vessel diameter and length for field separators.
Inputs
Typical: 2–5 min
Results
Min Diameter
--
in
Min Length
--
ft
Gas Velocity
--
ft/s
L/D Ratio
--
Equations
Gas velocity: Using Souders-Brown coefficient K ≈ 0.35 ft/s for horizontal separators
V_g = K × √((ρ_L - ρ_G)/ρ_G) where ρ_L ≈ 50 lb/ft³
Min area: A = Q_gas_acfs / (V_g × 0.5) [50% of cross-section for gas]
Liquid volume: V_liq = Q_liq × retention_time / 1440 [bbl]
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