Abstract: A treater for electrostatically separating entrained saltwater from oil during longitudinal flow through a horizontally elongate metal tank, wherein the gas vapor and freewater are separated by gravity separation. Foam is eliminated by passing the gas vapor through an oil wash and coalescing of the entrained saltwater droplets is accomplished by flowing the emulsified oil downward through an electric field. The force of the downward flow through the electric field sweeps the coalesced saltwater drops from the electric field. The oil containing the coalesced water drops flows horizontally from the electric field rearward in the treater for gravity separation of the coalesced saltwater drops from the oil. Saltwater free oil, gas vapor and saltwater are discharged separately from the treater.

Abstract: A high voltage electrode for supplying high potential electrical energy to dispersed electrically conductive matter suspended in a relatively non conductive continuous phase atmosphere within a sealed chamber of a vessel. The electrode receives power from a source which is external to the vessel and the electrode passes through an insulated cover secured to an opening in the vessel. The insulated cover may include further openings for receiving a fluid sensor and/or a vapor vent.