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� ,�/' � ' 7//LJ .�1�1.'�I�oir/ <br /> , <br /> �� .B�p��oM s r-15 <br /> PU?iP SLI,LCTION PI�OCLDURL <br /> A. Determine pump capacity: � <br /> 1 . Alinimum suggested is 600 gallons per hour (10 �;pm) - <br /> to stay ahead of water use rate <br /> 2. riaximum suggested for delivery to a drop box of a home <br /> system is. 2700 gallons per l�our (45 .�pr.i) to prevent <br /> buildup of pressure in drop box <br /> 3. Use value from desi�n oF pressure disLribuCion system <br /> SELECT�n PiJ�IP CAPACITY . . . . . . <br /> . . . . . . . . . . __ 3s'. s �p�n <br /> B. Determine head requirements: <br /> 1 . Elevation difference between pump .ancl poiiit oF dischar�e � ` feet <br /> --�--= <br /> 2. If pumping to a pressuresdistribution. system, add 5 feet <br /> for pressure required at manifold . . . . . . . . . . -S feet: <br /> 3. Friction loss �--- <br /> a. Enter friction lo'ss table with gpm and pipe diameter. <br /> F.ead friction loss in Leet per 1Q0 feet from page r-18. <br /> F. L. = 6. 96 ft/100 ft <br /> b. netermine total pipe length From pu�nP to discharge <br /> point. Ac?d 25 percent to pipe leiz�tll for fitting <br /> 1oss, or use a fitting loss chart. Equivalent pipe <br /> � length = 1., 25 rimes pipe len�th = 1.25 x 'Sp : _ �1,S feet <br /> c. Calculate total fricrion loss by uiulti.plying <br /> fr. icCi.on loss i.n Et/:L00 (t hy equi.v:alent pii>e <br /> l�n�th . � <br /> � , �2. S = _y. � _ fcet <br /> 'fotal frictio�� loss = 6• ��ia �; � <br /> u . Total head requir.ed is the sum of elevation di.t-ference, <br /> special head requiremenLs, ancl total fric�ioil loss. <br /> y� + 5 -f- - �y- `/_ <br /> 'iOTAL ��rnn . . . . . . . . . . . . . . . . . . . . . . /� Y� t��t <br /> C. Pump selection <br /> l . A pump must be selected Eo deliver at least .�5, S gpm <br /> with at lcast ��, �/ feet of total heac.l . <br /> D. To maximize p�mp liEe select sump sizc Por 4 Lo 5 pump <br /> operarions per day. <br /> I?. Cn1cu.late <irainUack <br /> 1 . Determine total ��i.pe ].en�;l'h, .$�O, Peet . <br /> 2 . Determine •liquid volume oP pipe, _1Q� S� f;allons per <br /> 100 feet. (Sc� �age L-1S) <br /> 3 . riultiply lengtti by volumc: Drainb<�cic quanti�y = <br /> SO feet x /U. Sb' �allons/100 fC = .J�. 3 f.allons <br /> 4 . Suggested drainbacic quai�tity is 10 percenC of pumped quantity. <br /> A larger drainback percenCa�e coill decrease pump staLion <br /> efficiency• sli�htly Uut pumpin� enerQy cos�s are usually a <br /> relatively Small part of the total householcl ener�y costs. . <br />