Question

PAGE 2 ME2135/ME2135E QUESTION 1 A centrifugal pump of 0.37 m diameter, is pumping water (of density 998 kg/m) at 2160 rpm and produces the following performance data (where the symbols used have their usual meaning): Q (m3/s) | 0.0 H (m)105 P (kW) 100 0.05 104 115 0.10 102 135 0.15 0.20 95 202 0.25 85 228 0.30 67 249 100 Determine (a) the best efficiency point (BEP) and (b) the maximum possible discharge estimated from the tabulated performance data. (c) If we want to use this same pump family to deliver 26.5 m/min of kerosene (of density 804 kg/m3) at BEP and an input power of 400 kW, what pump speed (in rpm) and impeller size are needed and what head will be developed? (25 marks)

Answer 1

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2)60 3 2子. 0.082o o.109o 5.2S :055 o-13 o.16S 5.8) 5 S.5 3 4.70 | 3.10 Cn ys Ca ives c* osene 26 3 n D 3 98198 3 r5 0.643 x 8o 4.

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