Journal of Applied Science Issue (2) April (2019) 14 IMPROVEMENT OF SHARARA CRUDE OIL FLOW USING POLYSTYRENE AND POLYDIMETHYLSILOXANE AS DRAG REDUCING AGENTS Rabeeah H. Sultan 1 , Abduelmaged B. Abduallah 2 and Omar M. Sultan 3 1 MSc student at Department of Chemical Engineering, Faculty of Engineering in Sabratha, Sabratha University, Libya (e-mail: manarsultan1980@gmail.com). 2 Associated Prof. at Department of Chemical Engineering, Faculty of Engineering in Sabratha, Sabratha University, Libya. 3 Associated Prof. at Department of Petroleum Engineering, Faculty of Engineering in Zawia, Zawia University, Libya. Abstract In this study the applicability of the Libyan crude oil flow induced by improved lab pumping system was examined in order to evaluate the effect of adding polymeric materials of Polystyrene and Polydimethylsiloxane as drag reducing agents (DRA) on the flow of Sharara crude oil in the pipeline. The polymers are injected through a pumping system at different concentrations rounded between (10-100) ppm. Several experiments were carried out to determine the best concentration of polymer, which satisfied lowest drag force on of crude oil flow rate. Furthermore, the effect of additive concentration on the Viscosity(μ), friction factor (ƒ), percentage drag reduction (%DR) and the amount of flow increases (%FI) were determined. The results show that the activities of Polydimethylsiloxane for Drag reduction is higher than drag reduction for Polystyrene. However, the %DR is generally increased with increasing of polymer concentration for all tested additives. It is progressively increased with increasing Reynolds number (Re) at any specific concentration of the polymeric additives. The friction factor is well correlated with Reynolds numbers and polymer concentration according to the relation of the form ƒ= k Re a C b , the results showed good agreement between the observed values and the predicted ones. Keywords: Crude oil, polymer, drag reduction, turbulent Flow, pipeline. Introduction Transportation of Liquid occurs in many chemical and process industries including the petroleum industry, where crude oil and its derivatives are transported over long distances trough pipelines. Friction experienced by oil flowing past the pipe walls leads to a pressure drop between two points on the pipe by Murenzi, D. (2008). Addition of specific material such as sand, and mud can result in reduction of friction in turbulent pipe flow, which has been known for over fifty years, and the added material is called drag reduction agent (DRA) by Toms, B. (1948). This