I work in CDU with a capacity of 70000 barrels \ day I have a problem. when we introduced desalter to work, the amount of feed unit quantity decrease to 85%, especially when the introduction of washing water to work by 17000 kg \ hour DIFFERENTIAL PRESSURE on the mixing valve set to 0.35 kg \ cm2,desalter pressure is 11 kg \ cm 2 When trying to increase the unit capacity, the desalter press. Increased and send a signl to the pressure valve that is installed on the charge pump discharge to derease it’s open to reduce the increasing pressure.
Crude oil is taken by gravitation flow from storage tanks. The crude oil is fed pump P01 to the first part of one route heat exchanging system, where is preheated in the train of exchangers E01, 02, 03, 04 and 05 to temperature 125-130 °C. The crude oil with this temperature enters the single stage electrostatical desalting. Desalting process operates with pressure 10-12 kg/cm2g and Desalted crude is fed by means of pumps P02 to the second part of one route heat exchanging system (exchangers E06, E07, E08, E09, E10), where is heated to temperature 244-252 °C. Crude oil is dividing into four equal streams. Each of the four streams is controlled by a flow controller and enters the convection section of heater H01. In the heater (convection and radiation section) it is finally heated to temperature 342-348 °C