A manufacturing company uses a 100 bar hydraulic power system which supplies 10 liter/minute of oil flow. The shaft speed is 1500 RPM and the nominal displacement is 8 cm3/revolution. The theoretical drive torque is 11.4 Nm. If the electric motor driving the pump has an efficiency of 95%, a. Name in detail all 27 hydraulic power components as illustrated in the above figure. b. Calculate the volumetric efficiency, the fluid and shaft power, the overall efficiency of the pump.

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# 2 A pump supplies oil at 25 gpm to 1 % in diameter double -acting hydraulic cylinder. If the load is 1200 lb (extending and retracting) and the rod diameter is 4 in. find the c. Hydraulic pressure during extending stroke d. Piston velocity during the extending stroke e. Cylinder horsepower during the extending stroke f. Hydraulic pressure during the retracting stroke g. Piston velocity during the retracting strike h. Cylinder horsepower during the retraction stroke.

Problem-3: A centrifugal pump lifts water against a static head Az = EN m. The pipe setup has a constant diameter of 0.08 m, major losses in the suction side h, = EN3 m and in the discharge side hLD is 3 m. The pump impeller has a diameter of 0.15 m, exit width of 0.015 m, exit blade angle of 22° and speed of N = 20EN rpm. The hydraulic efficiency is 0.85. If the flow at the entrance is radial, find the discharge, pump head, atmospheric pressure Pat, Vapor pressure P, and maximum allowable height of the pump from the feeding tank water surface elevation if the pump is operating under T 25 °C at altitude H= 20EN m. %3D 0, = NPSHR/Hp =1.21×10³N = (P EN=62 Is-mx at-abs-P,)/Y-hLsT -0H, Pa-abs /Y = 10.33(1– 2.256x10-H)56 P,ly = e14.29-3985(T+233.4))

A hydraulic motor has 7.5-in³ volumetric displacement. If it has a pressure rating of 1200 psi and receives oil from a 25-gpm theoretical flow-rate pump, find the motor a. Speed b. Theoretical torque C. Theoretical horsepower

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