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A pump is required to deliver 240 gal/min of water at 15C from a vented lower reservoir to a pressurized tank (see figure).-The suction line is 3 m long and the discharge is 120 m. It is observed that the atmospheric pressure is 88 kPa and consider the vapor pressure to be 2.45 kPa. Calculate the following: a) Pump Head (ha) b) Select a suitable pump from the available charts. c) Calculate the NPSHA and state if the pump will run cavitation free or not. d) If the rpm is increased by 30% calculate the new flow rate, new head and power required. e) The pressure at the pump outlet. p= = 241 kPag Standard elbow 24.4 m Flow 21/2-in Schedule 40 steel pipe 31/2-in Schedule 40 steel pipe 2.44 m Pully open gale valve Pump Swing-type Butterfly check valve valve 342 CHAPTER THIRTEEN Pump Selection and Application TABLE 13.2 Vapor pressure and vapor pressure head of water Temperature "C Vapor Pressure kPa (abs) 0.6105 Vapor Pressure (psia) Specific Weight (kN/m2) 9.806 9.807 9.804 9.789 Temperature F 32 40 Specific Weight (lb/ft?) 62.42 62.43 o 5 0.8722 0.08854 0.1217 0.1781 8 8 8 8 10 1.228 2.338 Vapor Pressure Head (m) 0.06226 0.08894 0.1253 0.2388 0.4345 0.7580 1.272 2.066 3.250 62.41 62.37 Vapor Pressure Head (ft) 0.2043 0.2807 0.4109 0.5917 0.8393 1.173 1.618 2.205 20 0.2563 30 70 0.3631 40 9.765 9.731 9.690 80 0.5069 4.243 7.376 12.33 19.92 31.16 62.30 62.22 62.11 62.00 50 90 0.6979 60 9.642 9.589 100 120 0.9493 1.692 70 61.71 3.948 80 47.34 9.530 4.967 140 2.888 61.38 6.775 90 9.467 7.405 11.18 70.10 101.3 61.00 61.58 100 9.399 10.78 160 180 200 212 4.736 7.507 11.52 17.55 27.59 60.12 59.83 14.69 35.36 APPENDIX A Properties of Water TABLE A.2 U.S. Customary System units (14.7 psia) Temperature Specific Weight Y (lb/ft) Density P (slugs/ft?) (F) 32 62.4 1.94 40 62.4 1.94 50 62.4 1.94 60 62.4 1.94 70 62.3 1.94 80 62.2 1.93 90 62.1 1.93 100 62.0 1.93 Dynamic Viscosity (1b-s/ft2) 3.66 x 10-5 3.23 x 10-5 2.72 x 10-5 2.35 x 10-5 2.04 x 10-5 1.77 x 10-5 1.60 x 10-5 1.42 x 10-5 1.26 x 10-5 1.14 x 10-5 1.05 x 10-5 9.60 x 10-6 8.90 x 10-6 8.30 x 10-6 7.70 x 10-6 7.23 x 10-6 6.80 x 10-6 6.25 x 10-6 Kinematic Viscosity (ft2/s) 1.89 x 10-5 1.67 10-5 1.40 x 10-5 1.21 x 10-5 1.05 x 10-5 9.15 x 10-6 8.29 x 10-6 7.37 x 10-6 6.55 x 10-6 5.94 x 10-6 5.49 x 10-6 5.03 x 10-6 4.68 x 10-6 4.38 x 10-6 4.07 x 10-6 3.84 x 10-6 3.62 x 10-6 3.35 x 10-6 3.17 x 10-6 110 61.9 1.92 120 61.7 1.92 130 61.5 1.91 140 61.4 1.91 150 61.2 1.90 160 61.0 1.90 170 60.8 1.89 180 60.6 1.88 190 60.4 1.88 200 60.1 1.87 212 59.8 1.86 5.89 x 10 TABLE 13.1 Classification of types of pumps Rotary Gear Vane Screw Progressing cavity Lobe or cam Flexible tube (peristaltic) Positive displacement -Reciprocating E Piston Plunger Diaphragm Kinetic E Radial flow (centrifugal) Axial flow (propeller) Mixed flow Jet or ejector type