Category: Two Phase Separator Theory

Separation Retention Time

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An amount of time is needed to assure that the liquid and gas reach equilibrium at separator. The time is defined as “retention time” or the average time a molecule of liquid is retained in the vessel assuming plug flow. The retention time is the volume of the liquid storage in the vessel divided by […]

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Two Phase Separator Re-entrainment

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Re-entrainment is a phenomenon caused by high gas velocity at the gas-liquid interface of a separator. Momentum transfer from the gas to the liquid causes waves and ripples in the liquid, and then droplets are broken away from the liquid phase. The general rule of thumb that calls for limiting the slenderness ratio to a […]

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Two Phase Separator Drop Size

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The purpose of the gas separation section of the vessel is to condition the gas for final polishing by the mist extractor. From field experience it appears that if 100-micron drops are removed in this section, the mist extractor will not become flooded and will be able to perform its job of removing those drops […]

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Two Phase Separator Settling Time

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Two Phase Separator Settling Time

In the gravity settling section the liquid drops will settle at a velocity determined by equating the gravity force on the drop with the drag force caused by its motion relative to the gas continuous phase. The drag force is determined from the equation: where FD = drag force, Ib CD = drag coefficient A […]

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