A centrifugal pump having extemal and intemal diamcters as 750 mm and 400 mm respectively is opcrating at 1000 r.p.m. The vanes are curved hack at 35° to the tangent at outlet. If the velocity of flow is constant at 6 m/s, find (a) vane angle at inlet, and (b) work done per kN of water.
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- 3. A centrifugal pump of 350 mm diameter running at 1000 r.p.m. devclops a hcad of 18 metres. The vanes are curved back at an angle of 30° to the langent at outlet. If the velocity of flow is constant at 2-4 m/s, find the manometric efficiency of the pump. (Ans. 76-4%)Ex: A centrifugal pump delivers (0.07 m³/s) of water at (1500 rpm) and the velocity of flow through the impeller at exit is (3m/s). The impeller diameter at inlet and out let are (0.18&0.027) respectively, and blades are curved back with an angle of 25° to the tangent at exit (the blade angle is 155° with the direction of motion). The diameter of the section and delivery pipes are (0.15 & 0.1m) respectively. The absolute pressure head at section is (6.5 m) and that at delivery is (29 m). the power taken by the pump is (35 hp). Calculate the van angle at the inlet, the overall efficiency and the monomeric efficiency and the losses across the pump.1. A centrifugal pump has external and internal diameters of 300 mm and 150 mm respectively. The vane angles of inlct and outlet are 25 and 30° and the pump runs at 1450 r.p.m, If the velocity of flow through the pump is constant, find the work done per kN of water. (Ans. 20-2 kJ)
- 1- A double jet of Pelton turbine driven by double nozzles to produce (4250 kw) to the shaft of an electrical generator when running at (400 rpm). The height of (180 m). wheel diameter is (1450 mm). The velocity of relative= 0.9 of jet velocity. If the angle of bucket is (165'), determine: a) Hydraulic efficiency b) Diameter of the jetA centrifugal pump having an impeller of diameter 500 mm delivers 140 litres of water per sccond. The velocity of flow is 1 m/s and the vanes are curved back at outlet at 30° to the wheel tangent. If the impeller speed is 400 r.p.m., find the power to drive the pump. (Ans. 12-9 kW) 3.ersity of Ve A centrifugal pump runs at 1000rpm with their vane angles at inlet and outlet 20°and 35° ,respectively. The internal and external diameter are 25cm and 50cm, respectively. Find the work done per N of water? Asuuming the velocity of flow constant. Water inter radially through the pump.
- The impeller of a centrifugal pump having external and internal diameter 500mm and 250mm respectively, width at out let 50mm and running at 200rpm works against a head of 48m. The velocity of flow through the impeller is constant and equal to 3m/s the vanes are set back at an angle of 400 at outlet. Determine A.inlet vane angle B.workdone by the impeller on water per second c.manometric efficiencyThe external and internal diameters of the impeller of a centrifugal pump are 0.3 m and 0.15 m respectively. The rotational speed of the pump is 1200 rpm and the vanes make an angle of 28° with the peripheral velocity direction at the outlet. The velocity of the flow through the impeller is constant at 1.7 m/s. Assuming the manometric efficiency of 82%, find the vane angle at the inlet (°). 18:19 /2. A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300 kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mmrespectively. The blades occupy 12% of the impeller area and the water is assumed toenter the impeller radially. Suction and delivery pipes are equal in size. Determine:2.1. The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vfi in terms of Di and Ui in terms of Di both sub into Tan of Blade inlet angle, only unknown is then solving for Di2) 2.2 If the pump has a mechanical efficiency of 80%, calculate the blade velocity at outlet (Uo) and outlet whirl velocity Vwo. Assume the blade exit angle equal to the guide vane angle. (Hint - Substitution: Write Vwo in terms of Uo sub in Euler equation only unknown then is solve for Vwo 2.3 Impeller outer diameter. 2.4 If the flow through velocity is consistent…
- Note: Don't copy from other experts solution. If you don't know the solution please leave it but don't give me wrong solution. A 26-kW motor with 78% efficiency drives a centrifugal pum p delivery 68 L/s against a head of 24 m. Determine the pump efficiency.Seven hundred gallons per minute of water are being discharged by a centrifugal pump 5 ft above the pump inlet. The inlet pressure is 4-in Hg above the atmospheric and the discharge pressure is 29 psia. If the pump has an 8-in diameter inlet and a 4-in diameter discharge, find the new flowrate if thr pump speed is doubled. Assume the pump input is 8Hp. A. 700 gpmB. 1050 gpmC. 1400 gpmD. 1750 gpmA single-stage centrifugal pump having a suction pipe 254 mm in diameter anda discharge pipe diameter of 5 inches is being tested and found out to discharge 48 lps ofwater. A pressure gage connected to the inlet pipe reads 118 mm Hg vacuum and adischarge gage reads 150 kPa at a distance 100 cm above the point where the inletpressure was measured. If the kW rating of the driving motor is 12 kW, calculate a) the pump efficiency. b) if this pump runs at 1800 rpm, what will be the new discharge rate,head, and power developed if the pump speed was increased to 3600 rpm? Assumeconstant efficiency. c) Determine the pump type.