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2. Two identical pumps are installed in a pumping station. One of them is mainly used as a standby but due to increase future flow requirements it is proposed to also bring this into continuous operation. The static head is 20 metres, and the following are the pump-pipeline characteristics: TableQ2-1 Single Pump characteristics Discharge (US) Head (m) Efficiency (%) 0 50 20 45 65 40 33 69 60 19 40 70 10 20 TableQ2-2 Two pump in parallel characteristics Discharge (V) Head (m) Efficiency (%) 0 50 20 45 65 40 33 llo 60 19 40 70 10 20 69 TableQ2-3 Two pump in series characteristics Discharge (V/s) Head (m) Efficiency (%) 0 50 20 45 65 40 33 69 60 19 40 70 10 20 TableQ2-4 Main characte tics 0 Discharge (l/s) Head losses (m) 20 1.0 40 4.0 60 10.0 70 19.0 (a) Determine the present maximum flow. You may find following expression useful: P=4 POQH n [10 Marks) (b) Investigate the relative suitability of arranging the two pumps in series and in parallel to provide increased flow. Justify your choice of the arrangement. [15 Marks] [25 MARKS]