Global Journal of Researches in Engineering, G: Industrial Engineering, Volume 23 Issue 2

Fig. 3: Probability Plots for Corrosion Penetration Rate c) Optimization of Corrosion Penetration Rate As can be indicated from Figure 4, for a simulation model of one year, the minimum corrosion penetration rate conditions were determined as, temperature (100 ºF ), pressure (360 psig), flow rate (150,000 bbl/day), and pH (5.65). Accordingly, the minimum corrosion penetration rate is 3.98 mm/year. Figure 5 illustrates the contour plots that represent the simultaneous effect of two variables on response, with the other variables fixed to the mean value in the range of factors. As the stronger the effect, the color in the drawing is green, and the weaker the effect, the color is blue. As an illustration, this figure shows a contour plot that represents the simultaneous effect of flow rate and temperature at pressure=480 and pH=5.58 on CPR, the larger values of the factors (flow greater value of the corrosion penetration rate, and the smaller values of the factors (flow rate 150,000 bbl/day and temperature 100 ºF) giving the lower value of the corrosion penetration rate. 0.050 0.025 0.000 -0.025 -0.050 99 90 50 10 1 Residual Percent 6.0 5.5 5.0 4.5 4.0 0.050 0.025 0.000 -0.025 -0.050 Fitted Value Residual 0.04 0.02 0.00 -0.02 -0.04 10.0 7.5 5.0 2.5 0.0 Residual Frequency 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0.050 0.025 0.000 -0.025 -0.050 Observation Order Residual Normal Probability Plot Versus Fits Histogram Versus Order Residual Plots for CPR rate 240,000 bbl/day and temperature 130 ºF) giving the © 2023 Global Journals Global Journal of Researches in Engineering Volume XxXIII Issue II Version I 35 Year 2023 ( ) G Modeling and Optimization of Corrosion Penetration Rate in Crude Oil Pipeline using Response Surface Methodology based on Aspen HYSYS Simulation Software and pH Fig. 4: Main Effect Plots of Crude Oil CPR Processes Parameters Temperature, Pressure, Flow Rate