A 15 kW centrifugal pump working at 75% efficiency, is pumping a liquid of unit weight 10000 N/cum through an additional head of 10 m, what is the discharge in cum/s ?
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- A centrifugal pump discharging 10 lps against 25 m of head and operating with an efficiency of 60% requires 4.1 kW at 1000 rpm. What is the theoretical discharge if the speed is increased to 1500 rpm assuming the efficiency remains constant? What is the theoretical head and kW at 1500 rpm?A plant has installed a single suction centrifugal pump with a discharge of 68 m3/hr under 60 m head and running at 1200 rpm. It is proposed to install another pump with double suction but of the same type to operate at 30 m head`and deliver 90 m3/hr. What must be the impeller diameter of the proposed pump if the diameter of the existing pump is 150 mm?Compute the horsepower required to pump : a) A stream of 60 liters per second against a head of 12 meters, assuming 100% efficiency. b) Actual pumping plant efficiency is 59%. What is the horsepower requirements?
- A 20 cm centrifugal pump delivers 13.2 lps at a head of 45 m when running at a speed of 1350 r.p.m. A similarly designed pump of 15 cm size runs at the same speed . What are the most likely values of discharge and delivery head serviced by this second pump ?A pipe 800 m long connects two reservoirs whose level difference is 60 m. Find the discharge in pipe in Liters/sec, if diameter of pipe is 0.5 m. Take all losses into account. Assume f = 0.01PROBLEM 5: A turbine, located at an elevation 255 m below that of the water surface at intake, carries a flow of 3.5 m^3/s. The head loss in the pipeline leading to it is 10 m. Find the horsepower delivered by the turbine if its efficiency is 92%. (746 watts = 1 HP). Illustrate the problem and show your complete solution.
- For a 100 MW hydro power plant, calculate the water volumetric flow ratefor the 3 head values of 50m, 100m and 300m. Assume effective head to be85% of the gross head.The difference in levels between the catchment reservoir and the service reservoir of a town supply is 180 m and the distance between them is 64 kilometers. The reservoirs were originally connected by a single pipe designed to carry 27x10^6 liters per day. Calculate the diameter of the pipe. Use f = 0.008A rectangular channel having a width of 3 m. carries water flowing at a rate of 20 m3/s. If the depth of water in the channel is 1.2 m., compute the critical kinetic energy in meter. a. 1.290 b. 0.480 c. 0.825 d. 2.567
- a centrifugal pump discharges 300 gpm against a head of 55 ft when the speed is 1500 rpm. The diameter of the impeller is 15.5 in. and the brake horsepower is 6.0. a. determine the efficiency of the pump. b. what should be the speed of the geometrically similar pump of 15 in. in diameter running at a capacity of 400 gpm?A manufacturing facility consumes 40 m^3/h of water taken from a nearby river located 15 m below the factory tank.Calculate the daily pumping cost if water is conveyed through a 3in, 240 m-long pipe, including friction losses. The cost of electrical energy is 0.831 pesos/kilowatt-hour and the pump operates with 80% efficiency.Explain the relationship between efficiency n ,head H, inflow power Pi and the best efficiency point (BEP) of a centrifugal pump.