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�, . . <br /> � � . <br /> � � 3 BE'o,�oQn� . <br /> r-ls <br /> , PUMP SELECTION PROCEDURE , <br /> A. Determine pump capacity: , "" " ` '" "" � <br /> 1 . Minimum suggested is 600 fiallons per hour (10 �pm) - <br /> to stay ahead of water use rate � " ' ' <br /> 2. Maximum suggest�d for delivery to a drap box of z home <br /> system is. 270� gallons per hour (45 �pm) to prevent <br /> buildup of. pressure in drop box <br /> 3. Use value trom design of pressure distribu•Cion system <br /> SELECTEn PUMP CAPACITY . . . . . . . . � • . . . . .. . _' .Z�. 6 �Pm <br /> i3. Determine head requirement�s: ` <br /> 1 . Elevation dif•ference between pump and point of dischar�e . .� t feet <br /> 2. If pumping to a pressure distribution system, add 5 feet <br /> for pressure required at manifold . . . . . . . . . 5 feet <br /> 3. Friction loss � �—�----- <br /> a. Enter friction loss table with gpm and tipe diame'ter. � ' ' <br /> Read friction loss in feet per 100 feet from page F-1R. <br /> F. L. = g. 9 ft/100 ft <br /> b. Determii.ie total pipe length from pump to �,�$Gha,rbe <br /> point. Add 25 percent to pipe length fbr fittin�;� <br /> loss, or use a fitCin�; lass cl�art. Is'qu.iyalent ��ipc <br /> length = 1.,25 [imes pi.pe ].en�tli = :1.25 x SOO = �ZS PeeL• � <br /> c. Calcul.ate Cotal fricl-ic�n 7oss by mu1tiplyin�; �� � <br /> fr. icti.on 10�:5 in ('t/1O0 fC hy equ•i.v;�].cnC pinc " . � <br /> len�th. <br /> " 'Potal friction loss = 8, 9 pp x �Z,; _ � S,j: 6 f�:�t <br /> 4. Total head required is Che sum of elevation difference, <br /> special head requirements, and total friction loss. <br /> :,5 � + 5 + f'!', G. <br /> TOTAL HFAA . . . . . . . , . . . . . . . . . . . . . . �S• 6 f ee t <br /> C. Pump selection <br /> 1. A pump must be selected to deliver aC least Z_ 6_6 r gpm <br /> with at least �5..6 feet of total head:. .,,:,.,, ;,;, , � � • <br /> D. To maximi2e pump life select sump size for 4 to 5 pump <br /> operations per day. <br /> I?. Calcu.late drainback . <br /> 1 . Determine tc�tal pi.pe ].engLh, .lDO ('ect. <br /> 2. Determine liquid volume of. pipe, ' . <br /> _7• 77 "p.,allons per <br /> 100 feet. (See page L•'-1$) �" � '" � ' ' <br /> 3. Multiply len�th by volumec Drainback quantiCy = <br /> .$04 feet x 7. �7 �atlons/1A0 ft � ,3$. 9 gallons <br /> • ' 4. Suggested drainback quantiCy is 10` percent' of pumped qua�4tity: ' <br /> A larger drainback percentaRe will decrease pump station <br /> efficiency� sli�htly but pumpin� ener�y co�sts are usually a <br /> relatively small part of the total household ener�y costs. <br />