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Immiscible liquids such as oil and water can be separated by gravity settling. The residence time required to effect separation depends both on system properties (such as density difference) and the dispersed droplet size. In a typical horizontal separation vessel with continuous flow, the increasing residence time for separation requires larger vessels.

Vessel size can be reduced by fitting devices which favourably change the settling characteristics.

• Coalescer Packs such as mesh pads co-knitted with wettable fibres can be installed to increase the size of the dispersed liquid droplets and so reduce settling time.
• Parallel Plate Packs consist of metal plates which form narrow flow channels, angled to drain away coalesced liquid. This results in greatly reduced vertical settling distance for the dispersed droplets travelling between the plates before coalescing out on the plate surface.

Rhine Ruhr design and manufacture a range of devices to enhance separation. These include Parallel Plate style devices (“Plate Packs”) as well as Honeycomb style coalescers (modified Dynapak structured packing). Depending on overall vessel design and fluid properties, these devices are capable of effective bulk removal of dispersed droplets in the range of 20 to 50 microns.