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Two water pumps are arranged in Series. The performance data for both pumps follow the parabolic curve fit
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FLUID MECHANICS FUNDAMENTALS+APPS
- Figure below shows the performance curve family of Model 5009 Centrifugal pumps of Taco Pump Inc., running at a fixed speed of N = 1160 rpm. For the pump with the impeller diameter D = 8.625 in., you are asked to determine the best efficiency point (BEP) of the given pump. What is the pump efficiency at BEP? HEAD IN FEET 50 0 0 0 0 40 20 10 O 81% 8.625" 30 (219mm). O 51% O 71% ○ 61% O Taco L/SEC 5 9.25" (235mm) 8.00" (203mm) 7.375" (187mm) 6.75" (171mm) 0 10 15 125 Model 5009 FI & CI Series 20 25 CURVES BASED ON CLEAR WATER WITH SPECIFIC GRAVITY OF 1.0 8 8 52 75% 77% 30 79% 1160 RPM FEBRUARY 19. 2002 35 40 45 REQUIRED NPSH olº 1.5HP (1.1KW) dot 17% Curve no. 2140 Min. Imp. Dia. 6.75" Size 6 x 5 x 9.0 50 55 60 75% 72% 250 375 500 625 FLOW IN GALLONS PER MINUTE 8% 2HP(1.5KW) 750 %09. 55% (2.2KW) 3HP 7.5HP(5.6KW) 2015 do 35% 875 FEET 15 12 -9 6 SHP(3.7KW) 3 0 10 8 NPSH 1000 HEAD IN METERS 5 KPo 45 -36 27 18 9 -0 100 -80 60 -40 2 -20 8 HEAD IN KILOPASCALSarrow_forwardB-A pump has the following parameters N=2133.5 RPM, Ns = 40 RPM, D= 37.1 cm and is used to pump water up to 90 m(H) at maximum efficiency operation: write the answer only (a) At what speed should the pump be operated to pump water up to (76 m)? (b) What is the discharge in each case? (c) What is pumping power needed in each case? (d) What is consumed electrical power in each case if max = 90%? e- A pump discharges liquid at the rate of Q against a head of H. If specific weight of the liquid is w, find the expression for the pumping power.arrow_forwardP (6-5) Two centrifugal pumps are connected in parallel in a given pumping system. Plot total head Ah against capacity Q pump and system curves for both pumps running on the basis of the following data: Operating data for pump 1 Operating data for pump 2 Ahm, 40.0 35.0 30.0 25.0 Ah m. 0.0 35 30 25 Qim³/h. 169 209 239 265 Q₂m/h 0 136 203 267 data for system Ah m, 20.0 25.0 30.0 35.0 Q.m³/h, 0 244 372 470arrow_forward
- 1.28. The performance curve for the fan of Problem 1.27 can be approx- imated by a straight line through its BEP (using techniques devel- oped in Chapter 7). The curve is Aps = 4488 – 166Q, with ApT in Pa and Q in m³/s. If this fan is connected to a 1-m dia- meter duct (f = 0.045) whose length is 66 m, what flow rate will result? %3Darrow_forwardQ1. Two pumps with 105.4 cm in diameters characteristics shown in figure below are used in paralel to pump water to the system. Neglecting local losses, calculate total flow rate and pump power. (a) n= 710 d/dak 120 7.5 80m ENPY (2) 6. 105 - 105.4 cm çap S N 4.5 3 90 96.52 cm çap 88% 86% 75 - 88.9 cm çap S4% (1) bom 60 1100 kW 45 750 kW 30 0.25 0.50 0.75 1.00 1.25 1.50 1.75 Debi m/s Note: Pipe is cast iron with 0.6 m in diamater and 1.6 km in length. Fluid is water with density 1000 kg/m³ . ENPY m %68 900 kWarrow_forwardGiven: Two(2) identical pumps series in connection Suction Pressure = 3.2 Bars Discharge Pressure = 4.95 Bars Suction Pipe Dia = 450mm Discharge pipe Dia = 480mm Velocity of Water = 4.25 m/s Solve: Total Head, Pump1 & 2 individual head and if Pump 2 is 9.5% less than Pump 1 and Or = Total Flow Ratearrow_forward
- The net head of a little aquarium pump is given by the man- ufacturer as a function of volume flow rate as listed below: Q, m'/s H, mH,O 1.10 1.00 1.0 E-6 2.0 E-6 0.80 3.0 E-6 0.60 4.0 E-6 0.35 5.0 E-6 0.0 What is the maximum achievable flow rate if you use this pump to move water from the lower reservoir to the upper reservoir as shown in Fig. smooth with an inner diameter of 5.0 mm and a total length of 29.8 m. The water is at room temperature and pressure. Minor losses in the system can be neglected. Note: The tubing is 0,80 m Pumparrow_forwardA horizontal Venturi meter is shown in Figure 8 to measure the flow rate of water in the mainpipe. The main pipe area and the throat area are 100 m2 and 50 m2 respectively. The pressureP1 is measured as 3000 kPa and the pressure in the throat is P2 = 50.0 kPa and assume, thedensity of water is 1000.0 kg/m3. Use Bernoulli’s Principle to: a) Determine the velocity V2 , m/s in the throatb) Determine the velocity, V1, m/s in the main pipec) Determine the flow rate Q, m3/s in the water mains.arrow_forwardA pump draws 20 L/s of water from reservoir A to reservoir B. Assuming f = 0.013 for all pipes, compute the horsepower delivered by the pump. Pump elevation is at datum.Data as follows: Reservoir A to pump. L= 500 m, D = 200 mm, EL. = 15 m Pump to Reservoir B L= 1200 m, D = 150 mm, EL. = 60 marrow_forward
- Two centrifugal pumps are connected in series in a given pumping system. Plot total head Δh against capacity Q pump and system curves and determine the operating points for (a) only pump 1 running (b) only pump 2 running (c) both pumps running on the basis of the following data: operating data for pump 1 Δh1 m, 50.0 49.5 48.5 48.0 46.5 44.0 42.0 39.5 36.0 32.5 28.5 Q m3 /h, 0 25 50 75 100 125 150 175 200 225 250 operating data for pump 2 Δh2 m, 40.0 39.5 39.0 38.0 37.0 36.0 34.0 32.0 30.5 28.0 25.5 Q m3 /h, 0 25 50 75 100 125 150 175 200 225 250 data for system Δhs m, 35.0 37.0 40.0 43.5 46.5 50.5 54.5 59.5 66.0 72.5 80.0 Q m3 /h, 0 25 50 75 100 125 150 175 200 225 250arrow_forwardA prototype pump is designed to so that the attached dimensionless performance curves apply. (a) If the pump is powered by a fixed speed motor delivering a rotational speed of 400 rpm and the impeller diameter is 2 m find the unknown quantities (Q, H, P,n ). Assume the pump is operating a peak efficiency and is pumping cold water. (b) If the pump is to be connected to standard steel pipe, which pipe should be used. Сн 1.00 Efficiency-n 0.75 CH 3 0.50 0.25 0.04 0.08 0.12 0.16 Ce C, and Efficiencyarrow_forwardTwo pumps (Pump A and B) have performance curves which can be approximated by the following equations: H_A = 340- (1.2(Q^2)), in feet H_B = 360 - (2.5(Q^2)), in feet where Q is in ft^3/s. If pumps A and B were to operate in parallel as depicted in the figure below, at what head (in ft.) should either pump be operated? ... Pump A Round your answer to 2 decimal places. J Pump Barrow_forward
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