Question 1: Vapor Pressure (kPaa) Losses, Tank to Pump, ht(m) A tank feeds hot propanol to a pump. You are asked to do an analysis to see if the pump might suffer cavitation: a. Analyse the system with the given data, and identify if cavitation is happening at the current conditions of the system. b. Determine the minimum required tank pressure (at the top of the liquid) to avoid cavitation (this pressure value might be lower or higher that the current tank pressure). Propanol Specific Weight (kN/m3) Vapor Pressure Head, hvp (m) Static Pressure Head, hsp (m) The elevation difference given is the tank liquid level elevation minus the pump elevation. (If this number is positive, the tank level is above the pump. If this number is negative, the tank level is below the pump.) Calculated NPSHA (m) The friction and minor losses between the tank and the pump, are analyzed and calculated at different propanol velocities. The total head loss vs. velocity is plotted in the attached graph. Min. Needed NPSHA (m) Cavitation in the Pump? (yeso) Vapor pressure vs. temperature for propanol is also provided below (see attached graphs). Min. Required Tank Pressure (kPag) The NPSHR comes from the chart for this pump. Temperature (C) = Propanol Density (kg/m) = Propanol Velocity (m/s) = Elevation Difference, (Tank - Pump] (m) Tank Pressure, at top of liq (kPag) = Chart NPSHR (m) = 60 805 5.53 6.84 93.7 7.2 Figure 2 Figure 1 Propanol Vapour Pressure vs. Temperature 55 50 115 110 105 45 100 95 40 90 85 80 75 30 70 65 25 Total Losses Head, h, (m) Propanol Vapour Pressure (kPaa) 60 55 50 20 45 40 15 35 30 10 25 20 5 15 10 0 0 5 1 2 3 4 5 6 7 8 9 10 Propanol Velocity (m/s) 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Temperature (C)