Consider the following data relating to the performance of a centrifugal pump: - speed = 1200 rpm. flow rate = 30 //s, head = 20 m, and power = 5 kW. If the speed of the pump is increased to 1500 rpm, assuming the efficiency is unaltered, the new flow rate and head, respectively, will be
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- An agricultural land install a pump with a 218mm diameter suction pipe and a 200mm diameter discharge pipe. Respectively each pressure reads 1.12 bars and 0.96 bars. The water flow measured 12.500 liters/min.at normal temperature. Calculate the following: 1. Head at the discharge side, m 2. Velocity Head. m 3. Total Head of the pump, mA pump pumps water from one tank (open to atmosphere) to another tank (open to atmosphere) at a height of 25 m. A pipe with a diameter of 50 mm and a length of 100 m (e=1.5 mm) is used in the system. Since the variation of the pump's head with the flow rate is given as H= 50-20000Q^2, calculate the water flow through the pipe by ignoring the local losses (ρ=1000 kg/m^3, μ= 0.001 N.s/m)A certain centrifugal pump was tested and its performance curves can be approximated as follows: H = 340 - 1.2(Q2), in feet BP = (0.0521Q3) + (1.25Q2) + (11.042Q) + 134.5, in horsepower where Q is in ft3/s. a. If a single pump is used to deliver water to a system which requires a total of 8 ft3/s, what is the efficiency of the pump (in %)? Take the specific weight of water to be 62.4 lbf/ft3. b. If two of these pumps are connected in series to deliver water to a system whose head requirement is 615 ft, what will be the operating discharge rate in ft3/s of either pump? Assuming the head is equally divided between the two pumps, what is the efficiency of either pump (in %)? Take the specific weight of water to be 62.4 lbf/ft3.
- The water system in an urban area consists of an old 200 mm pipeline 750 m long which conveys water from a pump to a reservoir whose water surface elevation is 105 m higher than the pump. Water is pumped at a rate of 70li/sec. Determine the horsepower saved by replacing the old pipe with a new 25 cm pipe. Assuming f=0.033 and 0.022 for the old and new pipe respectively. Neglect other losses except frictional loss.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?Neglecting head losses, determine what power the pump must deliver to produce the flow as shown. Here the elevations at points A, B, C, and D are 40 m, 65 m, 35 m, and 30 m, respectively. The nozzle area is 25 cm2.
- A pump system is used to move water at a flow rate of 30 L/s from a lower to a higher reservoir in a city with an elevation of 1000 m above sea level. The system is shown schematically in the figure below, with ∆?=30 m. Both the suction and delivery pipes have a diameter of 150 mm and an absolute roughness of 0.3 mm. The lengths of the suction and delivery pipes are 6 and 500 m respectively. Ignore local losses and assume a temperature of 15 °C. a)Develop a mathematical expression for the system curve (i.e. the pumping head required as a function of the system flow rate) from basic principles. Name all mechanics principles implemented. b)Calculate the required pump working point. What is the flow regime of the pipe flow. c)What power does the pump add to the water in the system?b) Water flows from a large reservoir through a pipe system which consists of 200 mm diameter ofpipe and 50 mm diameter of nozzle as shown in Figure 3. By neglecting all energy losses, calculate;(ii) Velocity and pressure at AA certain centrifugal pump was tested and its performance curves can be approximated as follows: H = 340 - 1.2(Q2), in feet BP = (0.0521Q3) + (1.25Q2) + (11.042Q) + 134.5, in horsepower where Q is in ft3/s. If a single pump is used to deliver water of a system which requires a total of 8 ft3/s, what is the efficiency of the pump (in %)? Take the specific weight of water to be 62.4 lbf/ft3.
- A conical tank 4.5m on top and 4,7m tall has a 60mm diameter orifice at its bottom for its outlet. Assume C = 0.63. The tank is filled with 7000 liters of water. What is the depth of the water in the tank in meters? How long will it take to drain the content of the tank in minutes? show solution and diagramExplain the relationship between efficiency n ,head H, inflow power Pi and the best efficiency point (BEP) of a centrifugal pump.Fluid Mechanics Two pipes of diameter 0.06 m and 0.01 m respectively, each of length 150 m are connected in parallel between two reservoirs which have a difference in water level as 15 m. Calculate the rate of flow for each pipe.