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' <br /> 12/07/02 Page 2 <br /> � <br /> ' Gravity Distribution <br /> Minimum suggested is 600 gailons per hour(10gpm)to stay ahead of water use rate. <br /> ' Maximum suggested for delivery to a drop box of a home system is 2,700 gallons per hour(45gpm)to <br /> prevent build-up of pressure in drop-box. <br /> ' A. Detertnine head requirements: <br /> 1. Elevation ditference befinreen pump and point of discharge= 12 feet <br /> 2. Head required for manifold= 0 feet <br /> ' B. Calculate Friction loss: <br /> 1. Lenth of Discharge Line= 150 feet <br /> ' a. From fiction loss table read friction loss per 100 ft.: 1.20 feet <br /> b. Friction Loss in Discharge Line= 1.8 feet <br /> ' c. Add On Head Loss= 5 feet <br /> Total Head Loss 18 feet <br /> ' A pump must be selected to deliver 26 gpm with <br /> 19 feet of total head. <br /> � <br /> ' <br /> � <br /> ' <br /> ' <br /> ' <br /> ' <br /> � <br /> ' <br /> , <br />