The Multi-Pack™ utilizes time-honored flat parallel plates set at a steep 55 degree angle. The smooth flat plates in a cross-flow design help make this the most non-fouling design industry has to offer. Plate gaps can be tighter with less plugging than traditional coalescer plate designs. 

The smooth flat parallel plates are set at a 55° angle from the horizontal. The coalescer plates set at this steep angle help keep the solids moving downward and off the plates. This steep plate angle helps ensure that solids are processed down and out of the coalescer. [While oils and grease, in the same manner, can move upward and off the underside of the plates to be processed up and out of the coalescer.]  Our smooth, flat-plate design has no “nooks and crannies” in which solids and sludge can be caught to prematurely foul the coalescer.

Other Designs: Plates angles are typically found in a range of 22° to 60° from the horizontal. One commercially available design has completely horizontal plates (highly prone to plugging) and one design has completely vertical plates (extremely inefficient for contaminant removal).

The plate widths (length of coalescer plates as measured from the entry view at the inlet) never exceed 24” in the Multi-Pack design. This yields a low Equivalent Diameter, further reducing fouling potential and is unique to the Multi-Pack design. A low Equivalent Diameter also leads to a low Reynold’s number, which describes he turbulence within the coalescer (the lower the number the more efficient the coalescer). With lesser turbulence within the coalescer, there will be more oils and solids removal per Stoke’s Law. Mercer has the lowest Equivalent Diameter in the industry as well as the lowest Reynold’s number. Mercer’s Reynold’s number is between 300-350 for it's standard separator design criteria.

Other Designs:Other designs have much higher Equivalent Diameters due to the longer plate widths and wider plate gaps. Further, the corrugations in the plates of other designs also increase the actual turbulence within their coalescers. Other coalescers have Reynolds numbers that may range from 500-2000.

In most of Mercer’s models (units over 50 gpm) the short plate widths have an inherent “herring-bone plate design” built into the coalescer. It is this herring-bone design that help produce the dedicated Chimney-Zone™ feature that is crucial for the removal of solids.

Non-fouling

The short plate widths, yield a low Equivalent Diameter (Deq). This is critical in preventing solids from building up and binding the coalescer. A low Equivalent Diameter also reduces turbulence within the separation area.

Cross Flow Design

While most coalescers employ a counter current flow of liquids and solids, Mercer utilizes a cross-flow design to combat fouling. This feature becomes increasingly important as plate gaps decrease. The Multi-Pack design allows both oil and solids to move in the direction of the flow, minimizing the counter-currents and turbulence that cause solids fouling and oil re-emulsification.