flow rate Q in liters per minute at maximum efficiency are estimated to be
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Q: Examples: Example 1: Water (p= 62.36 lbm/ft° and µ= 7.536×10* lbm/ft-s) is flowing steadily in a 2…
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- Find the specific speed of a double suction centrifugal pump delivering 1.5 m³/s against a net head of 15 m when running at 725 r.p.m. state the type of impeller to be employed for this pump.A centrifugal pump delivers 80 liters per second of water on test suction guage reads 10 mm Hg vacuum and 1. 2 m below pump centerline.Power input is 70 kW. Find the total fynamic head in metersQ Consider the following data relating toperformance of a centrifugal pump:speed 1200 rpm, flow rate 30 L/s, head 20 m, and power 5 kW. If the speed of the pump is increased to 1500 rpm, assuming the efficiency isunaltered, Find the new flow rate and head.
- 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%)a pump at 1750 rpm delivering 600 rpm aganist a total head of 200 tt. change in the filling system have increase the head of 450 feet. at what rpm should the pump be operate to achieve this new head at the efficiency?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)
- 2. A centrifugal pump having extermal and intemal diamcters as 750 mm and 400 mm respectively is operating at 1000 r.p.m. The vancs 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. (Ans. 16°; 123 kJ)A 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.Consider the following data relating toperformance of a centrifugal pump:speed 1200 rpm, flow rate 30 L/s, head 20 m, and power 5 kW. If the speed of the pump is increased to 1500 rpm, assuming the efficiency isunaltered, Find the new flow rate and head.
- 19. A centrifugal pump delivering 0-04 cumec of water to a height of 20 metres through a 10 cm diameter pipe 100 metres long. If the overall efficiency of the pump is 75% find the h.p. required to drive the pump. Take f-0'01. (51-88 hp)A large centrifugal pump has a 254 mm diameter inlet and a 127 mm diameter outlet pipe. Themeasured flow rate is 51.6 Liter per second of cold water. The measured inlet pressure is 127 mmHg above atmospheric and discharge pressure measured at a point 1.22 m above the pump outletis 212 kPa absolute. The pump input is 10 Hp. Find the pump efficiencyThe 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 efficiency