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A light fluid from different reservoir formation started recently to associate the production of the crude oil stabilization plant which is unfortunately not enough to release off all light components and as a results the true vapor pressure increased in the storage tanks more than 12 psi. From the results in Aspen Hysys, it was found that manipulating of working parameters for the existing plant likewise the inlet temperature, dry fluid flow rate, water flow rate and the temperature of the outlet fluid from Fired heater have no great effect on the true vapor pressure (TVP). The TVP at normal feed conditions of 50.5 C and for the plant with third and fourth stages are 14.96 Kg/Cm2. a and 10.23 Kg/Cm2. a, respectively. It was found that for the third stage, the changing in feed flow rates for both dry and water have no effect on the reducing TVP, while to stabilized the TVP for the exported crude oil within range of (68947.6 – 82737.1) Pa/(10 – 12) psia when the the fourth separator used in the process plant, the feed dry fluid flow rate (26.4 – 105.6) KBD, the minimum base sediment and water cut in the feed stream 4 Vol%, the inlet fluid temperature (43-51.5)⁰C and the differential temperature across the fired heater in range of (16-24)⁰C with feed temperature range (40-55)⁰C.
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