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� � � L e�'� .t,/it'4u J cG'� <br /> �i' /�r�%��-�o�,,.; <br /> ' F-15 <br /> PUI�iP SELECTION PROCEDUR� <br /> A. Determine pump capacity: <br /> 1 . Minimum sug�ested is 600 gallons ner hour (l0 �;p1») - <br /> to stay ahead of water use rate <br /> 2• Ma}:imum suggested for delivery to a drop box of a home <br /> system is 2700 gallons per hour (45 Qpm) to prevent � <br /> buildup of pressure :in droP box � <br /> 3. Use value from design of pressure distribution system � f <br /> /�I � <br /> SELECTEn PLT�1P CAPACITY . . . . . �t <br /> . . . . . . . . . . . --- __ � _ �P <br /> i3. Determine head requirements: <br /> 1 . Elevation difference between pump and poitlt of disctlarfie �� � feet <br /> 2• If pumping to a pressure disLribution system, add 5 feet <br /> for pressure required at manifold . . . . . . .�i feet <br /> 3. Friction loss � � ` ' --------- <br /> a. Enter friction loss table with gpm and pipe diameter. <br /> Read friction loss in feet per 1(10 feet froni pa�e I'-18. <br /> r. L. _ % /�/ ft/100 ft <br /> b. Determine total pipe length from pumP to discharge <br /> point. Acld 25 percent to pipe length for Littin� <br /> loss, or use a fi.ttinF; loss chart . Equivalent pipe <br /> l�ngth = l . 25 t imi�s ��ipe len�th = ].. 25 ;c `� (� _ ,t`�t� Q <br /> c. Calcul.ate total Eriction loss by multipl.yin�; � --- r�,�� <br /> (ricCion l�ss in ft/10O ft hy equival.ent pine <br /> lenpth . <br /> 'I'otal friction loss = �" �� <br /> 7 !Y it::,;x /�� 3� = f. / f e e t <br /> 4 . Total head required is the sum of elevation d9.ffererce, <br /> special head reyuirements, and total fr.i.ction loss. <br /> L� + -S + �. � <br /> TOTAL HF.AD . . . <br /> . . . . . . . . . . . . . . . . . �C�. !d f e e t <br /> C. Pump selection �� <br /> 1 • A pump must be selected fo deliver at least � . S gpm <br /> with at least ��$`, ,� feet of total head. <br /> D. To maximize pump life select sump size for 4 to 5 pump <br /> operations per day. <br /> 1;. Ca1cu.Latc cirainbacl. <br /> 1 . Determitle total ��i_Pc: ].en�;L11, �� teet . <br /> 2. Determine liquid volume of pipe, ,��, S;�' gallons per <br /> 100 feet. (See page �-18) <br /> 3. T1ultiPly lengtll by volume: Draiilback quantity = <br /> �Q _ feet x ��, ��' g;�.11ons/1_00 ft = u�i . �'�' �allons <br /> 4 . Suggested drainbacic quatitity is 10 percent of pumped quantity. <br /> A larger drainback percentage will decrease pump station <br /> efficiency slightly but pumping energy costs are usually a <br /> relatively small part of tlie total household energy costs. <br />