- Question 4 25 Marks A Assume You Are Working As A Sales Engineer In A Centrifugal Pump Distributing Company Let S Sa 1 (62.15 KiB) Viewed 44 times
QUESTION 4 [25 MARKS] a) Assume you are working as a sales engineer in a centrifugal pump distributing company. Let's say a farmer came to your office and consults you to buy a centrifugal pump to transport water from a lake to an open tank which is located 6.5 m above the lake. He also has prepared a piping system with a uniform pipe diameter of 150 mm and a length of 65.0 m. The pipe friction coefficient is 0.02 and the minor loss coefficient, k is 2.0. If you advise him to buy a centrifugal pump whose pump characteristic data is given in Table 2, prepare design calculations, and evaluate the operating properties that he could get for his pump system using the suggested pump in terms of flow rate (Q), head (H), efficiency (n), and power input (Pim) [Note: Please use the graph paper provided in the appendix. your answer script] Flow rate, Q (m³/s) Head, H (m) Efficiency. n (%) b) If another geometrically similar pump (running at 950 rpm) is connected in parallel to the one used in Q4(a) (running at 1420 rpm), carry out design calculations for the new pump characteristic data and complete Table 3. Both pumps have the same impeller diameter. [7 Marks] [CO3, PO3, C4] M 2022ONFINES Flow rate, Q (m³/s) Head, H (m) Efficiency, n (%) Table 2 0.012 0.018 0.024 0.030 16.2 11.6 86 85 7 0 22.6 21.6 19.4 0 52 74 submit it together with Table 3 [18 Marks] [CO3, PO3, C5] 0.036 0.042 6.5 1.0 70 46