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Electrostatic Oil DesalterElectrostatic Oil Desalter Horizontal electrode Dehydrator consists pf parallel electrode plates inside the vessel and applies AC electric fields between the plates. Normally we use double layer electrode plates (three layer electrode plates sometime). The upper layer connects to the ground and the lower layer connects to the AC power. The electric field between the two electrode plates is high field and the one between the lower electrode plates and th e oil/water interface is low (Both the upper and lower electrode plates connect to the ground and the middle electrode plates connect to the AC power with 3 layers of electrode plate. The electric field between the upper and the middle electrode plates is high field and the electric field between the middle and the lower electrode plates is low field).