Question

(100 points) Water at 25°C is pumped at a rate of 0.075m'/s from a reservoir 20m above a pump to a free discharge (this means discharged to atmosphere) 35m above the pump. The pressure on the intake side of the pump is 150kPa and the pressure on the discharge side of the pump is 450kPa. The pipe between the reservoir and the pump is 3 meters of 5in diameter cast iron. From the pump to the discharge the pipe is 50m of 25cm commercial steel. Each elbow is a regular flanged elbow. a. Determine the head supplied by the pump b. Total head loss between the pump and the discharge c. If operating at 1750rpm. Calculate the specific speed and state what type of pump should be used d. Select a pump from the provided curves e. Provide the bhp and efficiency of the pump f. Is the pump in danger of cavitation? Justify your answer. 1. D15 mse Elbows are flanged) 4-35 m -20m QI P3-450 kPa P2#150kPa TABLE 8.1 Equivalent Roughness for New Pipes [From Moody (Ref. 7) and Colebrook (Ref. 8)] Equivalent Roughness, ε Pipe Feet Millimeters Riveted steel 0.003-0.03 0.9-9.0 Concrete 0.3-3.0 0.001-0.01 Wood stave 0.0006-0.003 0.18-0.9 Cast iron 0.00085 0.26 Galvanized iron 0.0005 0.15 Commercial steel 0.045 0.0015 0.00015 or wrought iron Drawn tubing Plastic, glass 0.000005 0.0 (smooth) 0.0 (smooth) 1785 rpm 26 AXIAL FLOW 1920 rpm 10" PO PUMPS 1600 rpm 18 bp 71% 18 1400 rpm 16 1200 rpm 10 3 13 60% 40 1500 2500 3000 3500 500 1000 Water Flow (gpm) 0.03 0.05 0.07 0.09 0.11 0.13 0.13 0.17 0.19 0.21 Water Flow (m/s) Centrifugal Flow Model 4011 1760 RPMe B2 aco NPSH Min. Imp, Dia. 8.25 FI &CI Series November 1, 2010 Size 5x 4 X 11.0 SEC 1O 20 40 50 60 25 r75 20 60 15 45 10 30 15 5 160 0 11.25 (286mm 400 40 10,50 (267mm) 120 9.75 (248mm 2 9.00r/229mm) 808 8.25 (210mm) 20 9 200 40 10 100 CURVES BASED ON CLEAR WATER WITH SPECIFIC GRAVITY OF 1.0 200 400 600 800 10001200 1400 1600 FLOW IN GALLONS PER MINUTE 0 MIXED FLOW 16" EEIMW 1480 rpm 20 65 PUMPS 19 70% 17 16 14 1180 rpm 45 13 40 12 75% 70% 125 bp 30 6% 25 885 20 75hp 770 rpm 50 bp 10 25 hp 30 8000 9000 6000 7000 5000 3000 Water Flow (gpm) 0.35 0.40 0.45 0.50 0.550.60 0.6 0.15 0.20 0.2 Water Flow (m/s)

Answer 1

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As HOMEWORKLIB RULES rule,I have answered 4 parts not answered last two parts because of little bit confusion.Please don't give thumb down.

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