(Solved): (a) In a chemical processing plant process water at 25C is pumped from an open tank, through a 0. ...

(a) In a chemical processing plant process water at 25°C is pumped from an open tank, through a 0.10-m-diameter pipe, and into another open tank as shown in Figure 04. A valve is located in the pipe and all minor loss coefficients (K) are indicated in the Figure Q4. The pump head-capacity relationship is given by the following equation (3): * = 100.0 - 5.2 x 10' (3) with ha in meters when Q is in mºls. Assume a friction factor 1 = 0.026 for the pipe. The piping system consists of 25 m long suction part (L.) and 125m long discharge part (L.). The fluid levels in the two tanks can be assumed to remain constant. (1) Determine the operation flowrate for this pump (in m®/s). [10 marks] (1) Determine the power gained by the fluid (in Watt), and the Break Horse Power (BHP) of the pump if the efficiency, n, is 78%. [4 marks] Page 5 (ii) What is the available Net Positive Suction Head (NPSH) at the pump inlet? If the required NPSH = 2.4 m, Does the pump cavitate? Assume standard atmospheric pressure. [6 marks) (iv) Determine the minimum height (.... that the pump can be located below the water surface without cavitation [4 marks) (b) Find the head and the operating flowrate for the case of: () two identical pumps coupled in series. [6 marks] () two identical pumps coupled in parallel [6 marks] ? 2= 1 15 m L = 25 m z = 5 m L = 125 m Pump Solong Sharp-edge entrance K = 0.45 Globe valve 25% closed K = 10,0 radius elbow K=0.23 Sharp edge ext K - 1.00 Figure 04: Piping system