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a centrifugal pump has the following pressure capacity characteristics pressure...

Question: a centrifugal pump has the following pressure capacity characteristics pressure...

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A centrifugal pump has the following pressure- capacity characteristics: Pressure (kPa) 500 495 490 480 465 455 420 395 360 325 285 Capacity (n 0 25 50 75 100 125 150 175 200 225 250 It is planned to use this for a process having the following systenm characteristic: Pressure (kPa) 350 370 400 435 465 505 545 595 660 725 800 Capacity (m2 h0 25 50 75 100 125 150 175 200 225 250 (a) Determine the operating point for this pump with this system.

(b) The actual flowrate required by the process is 50 m3 h-1. If the overall efficiency of the pump at this flowrate is 70%, determine the power consumed when the liquid being pumped has a density of 1200 kg m-3. (c) A second pump is available which has the following characteristics: Pressure (kPa) 400 395 390 380 370 360 345 320 305 280 255 Capacity (㎡ h-) | 0 | 25 | 50 | 75 | 100 | 125 | 150 | 175 | 200 | 225 | 250 For the same flowrate (50 m3 h-1), this pump has an overall efficiency of 80% Determine the power used by this pump at a flowrate of 50 m3 h-1 (i) (ii) Would it be a better choice? Give reasons for your answer (iii) What other factors should be considered before a final choice is made?

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