Category: Separation Equipment

Three-Phase and Liquid-Liquid Separation

The gas handling requirements for three-phase separation are dealt with in a similar manner as discussed for two-phase separation. Traditionally, sizing for liquid-liquid separation has involved specification of liquid residence times. Fig. 7-22 provides suggested residence times for various liquid-liquid separation applications. These figures generally assume equal residence times for both the light and heavy […]

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Separator Liquid Handling Capacity

The design criterion for separator liquid handling capacity is typically based on the following two main considerations: • Liquid degassing requirements. • Process control/stability requirements. Generally, one or the other of these factors will dictate. Liquid capacity is typically specified in terms of residence time, which must be translated into vessel layout requirements for dimensioning […]

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Vertical Separators Gas Handling Capacity

Historically, the gas handling capacity of conventional vertical separators that employ mist extractors has normally been calculated from the Souders and Brown equation, Eq 7-8, using “experience-based” K factors. Typical K values for vertical separators from API 12J7 are presented in Fig. 7-18. In qualitative terms, the ranges of K given above may be taken […]

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Separators with Mist Extractors Gas Handling Capacity

Of the four major components of a separator that were discussed in a previous section, the mist extractor has the most impact on separated gas quality with respect to carried over liquid content. The sizing equations and parameters provided in the mist extraction section size the mist extractor itself, not the actual separation vessel. The […]

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Separators without Mist Extractors Gas Handling Capacity

Separators without mist extractors are not frequently utilized. The most common application of a vapor-liquid separator that does not use a mist extractor is a flare knockout drum. Mist extractors are rarely used in flare knockout drums because of the potential for plugging and the serious implications this would have for pressure relief. is typically […]

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