New equations covering a wide range of oil types are developed to estimate the treating rate and treating temperature for Dual Polarity electrostatic desalters and AC Conventional electrostatic desalters in Iranian Oil fields. Production of wet crude had been a growing field problem that affected the quality of produced oil in Iran. Application of right technology and installation of proper desalting facilities were required to solve this problem. Therefore it was decided to install electrostatic desalting plants progressively in Iranian oil fields. By end of 2004 more than 20 plants with a total capacity of 1.3 MMSTB/Day of treated crude has been installed. T h e performance of the majority of these desalting plants have been tested and found satisfactory. This study shows that the Dual Polarity electrostatic desalters may operate at a minimum crude oil inlet temperature, resulting in extra fuel savings and eliminating the need for a heating system in the vessel; and the treating rate for Dual Polarity electrostatic desalters is more than AC Conventional Electrostatic desalters.
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