Calculate the flow rate that will be required to meet the customers demand to filter the pool every 6 hours. Next, apply a Factor of Safety (FS = 1.5) to the calculated flow rate. You will use this value when selecting a pump for the system. Typically swimming pool systems should filter all of the water in an 8-hour period. However, this homeowner wanted to filter their pools water ever 6- hours. Assume the filter has been sized properly by the contractor. Ignore the effects of flow through the filter and salt cell. That is, you will treat that section as PVC pipe with one 90 Standard elbow. Let all pipe be 32mm PVC Plastic Pressure Pipe (Appendix G.3) Let all elbows in the suction system be 90 Standard elbows (Table 10.4) with a resistance coefficient of K=30fr. There is one standard Tee with a resistance coefficient of K=60fT. The homeowner has five 0.75in plastic globe valves (K=340fr) that he wants you to use. The valves can carry 15 gal/min of water [Table 10.6]. The design for the three suction lines from the pool is a sudden enlargement flow path. The water is maintained at 77F (25C). You want a pump that operates at 78% efficiency. The energy equation for this system is shown below. Assume p = p2 =0. +z+ v222 2g Y v/ +Z + +hA-h 29 = P2 Y