Three-phase flooded weir

A three-phase flooded weir separator is normally used where gas, water, and condensate flow rates are very high. In this design, NLL must be above the weir height. In the flooded-weir design, water and condensate holdups are high. This type of separator is very common where slug is a design consideration. 

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In case a three-phase flooded-weir separator is selected, the form will appear as shown in Figure 3.11. 

DESIGN OF THREE PHASE FLOODED WEIR SEPARATOR... 

Figure 3.11 Three-phase flooded-weir separator design.

As the flow rates are quite high and the design needs to accommodate 7 m of slug, a horizontal three-phase flooded-weir separator has been selected. 

A typical horizontal three-phase separator with flooded weir is shown in Figure 3.4. The inlet nozzle (Nl) and the gas outlet nozzles (N2) are placed as close as possible to the vessel tangent line. The distance of tiie nozzle center line and the tan line is dictated by tiie mechanical limitations of the vessel however, distances in Table 3.7 can be used for initial design. 

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