identify z1 and z2 values by taking the pump level as the base line before start solving. what would be the elevations for the suction line z1 and the discharge line z2 and then solve the problem. use the following equation for the head: H=pf/rho*g - p/rho*g - z equipment design course.

Problem #1 Consider the pump system given below. The suction side is 6 m of 4" Schedule 40 steel pipe with two elbows (90 standard radius elbow, max.) and a gate valve (fully open). The suction tank is at 1 bar (g), pumping water at a rate of 0.019 m3/s at 20C, the vapor pressure, Py = 2.339 kPa. The receiving vessel is pressure open to atmosphere. The discharge pipe is 46 m of 4" Schedule 40 steel pipe with six elbows (90 standard radius elbow, max.) and one gate valve (fully open) (not shown in the schematic diagram). (i) Use the attached pump performance curve (Figure 13.31) to select the suitable impeller diameter for this pump (that can deliver 0.019 m3/s) at the "calculated" total head). (ii) Calculated the power required by the centrifugal pump under the specified condition and compare your value to the break horsepower (bhp)of Figure 13.31. (you may use the efficiency as per Figure 13.31). Comment on your result. (iii) Calculate the available NPSHA? Is it sufficient to provide cavitation? If not, modify your system to prevent cavitation. (iv) is the operating pump of Figure 1" delivering enough head? If not, modify your system. Explain your answer. (physical properties of water; density 998 kg/m3, viscosity 1.002x10-3 Pa.s) (70 points) 1 atm 40 m Discharge line L = 46 m 4" Sch 40 1 bar(g) 7m Figure 1 3 m Suction line L = 6 m 4" Sch 40