Question

The characteristics of a centrifugal pump that is used to pump water (998 kgm-3 , 1.14×10-3 Nsm-2 ) from one reservoir to another are given in the table below. The difference between the water levels is 3 m. A 840 m long, 0.15 m diameter pipe with absolute roughness of 6×10-6 m joins the two reservoir.

Determine the (a) best efficiency point, (b) operating point, (c) operating efficiency and the (d) power adsorbed when the average velocity in the pipe is 0.96 ms-1 . Q (m3 s-1 ) 0.010 0.014 0.017 0.019 0.024 H (m) 9.5 8.7 7.4 6.1 0.9 ? (%) 65 81 78 68 12

Cheers.

Answer 1