Category Archives for Two Phase Oil and Gas Separation

Two Phase Vertical Separators Sizing

In vertical separators, a minimum diameter must be maintained to allow liquid drops to separate from the vertically moving gas. The liquid retention time requirement specifies a combination of diameter and liquid volume height. Any diameter greater than the minimum … Continue reading

14. September 2009 by Jack
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Two Phase Horizontal Separators Sizing

For sizing a horizontal separator it is necessary to choose a seam-toseam  vessel length and a diameter. This choice must satisfy the conditions  for gas capacity that allow the liquid drops to fall from the gas to the liquid volume … Continue reading

14. September 2009 by Jack
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Two Phase Separator Re-entrainment

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 … Continue reading

14. September 2009 by Jack
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Two Phase Separator Retention Time

To assure that the liquid and gas reach equilibrium at separator pressure a certain liquid storage is required. This is defined as “retention time” or the average time a molecule of liquid is retained in the vessel assuming plug flow. … Continue reading

14. September 2009 by Jack
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Two Phase Separator Drop Size

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 … Continue reading

14. September 2009 by Jack
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Two Phase Separator Settling

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 … Continue reading

14. September 2009 by Jack
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Horizontal VS. Vertical Vessel Selection

Horizontal separators are smaller and less expensive than vertical separators for a given gas capacity. In the gravity settling section of a horizontal vessel, the liquid droplets fall perpendicular to the gas flow and thus are more easily settled out … Continue reading

02. September 2009 by Jack
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Liquid Carryover and Gas Blowby

Liquid carryover and gas blowby are two common operating problems. Liquid carryover occurs when free liquid escapes with the gas phase and can indicate high liquid level, damage to vessel internals, foam, improper design, plugged liquid outlets, or a flow … Continue reading

02. September 2009 by Jack
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Sand

Sand can be very troublesome in separators by causing cutout of valve trim, plugging of separator internals, and accumulation in the bottom of the separator. Special hard trim can minimize the effects of sand on the valves. Accumulations of sand … Continue reading

02. September 2009 by Jack
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Paraffin

Separator operation can be adversely affected by an accumulation of paraffin. Coalescing plates in the liquid section and mesh pad mist extractors in the gas section are particularly prone to plugging by accumulations of paraffin. Where it is determined that … Continue reading

02. September 2009 by Jack
Categories: Potential Operating Problem | Tags: , , | Leave a comment

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