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CFD Analysis of a Multiphase Separator Vessel

SectorOil & Gas
DisciplineCFD — Multiphase
MethodEulerian-Eulerian, population balance
Diagnosing liquid carryover in a three-phase separator and validating an internals retrofit without changing vessel dimensions.

01 — ChallengeIntermittent liquid carryover into the gas outlet

A three-phase separator was carrying liquid droplets into the gas outlet stream intermittently, risking fouling of the downstream compressor. Operations suspected the inlet diverter, but had no way to confirm the flow pattern inside the vessel without shutting it down.

02 — ApproachTransient multiphase CFD of the full internals

The example uses a transient multiphase model (Eulerian-Eulerian with population balance for droplet size distribution) of the full separator internals — inlet diverter, mesh pad demister, and weir plates — using boundary conditions taken directly from site process data (flow rates, GOR, water cut).

03 — Simulation ResultVelocity contour & streamlines, optimized inlet diverter

Velocity contour and streamlines inside the separator vessel
Velocity contour & streamlines, optimized inlet diverterFig. 1 of 1

04 — Quantified ResultsBefore / After

ParameterBaselineResult
Peak inlet velocity6.8 m/s→3.9 m/s (−42%)
Liquid carryover, gas outlet~180 mg/Sm³→<25 mg/Sm³
Residence time (effective)baseline→+18%
05 — Business Impact

Avoided a vessel replacement estimated at $340K in capex by validating an internals retrofit as a like-for-like alternative.

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