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i/ <br /> �� S � f . ..i� . . .. <br /> � � G�C L A':��•� <br /> l�-I S <br /> '' YUA1P SEL�CTION PItOCI;DURE <br /> A. Determine pump capacity: ' `� � "" , <br /> 1 . Minimum suggested is 600 gallons per hour (10 �pm) - <br /> to stay ahead of water use rate <br /> 2. Maximum suggested for delivery to a drop hox of a liomc <br /> system is. 2700 gallons per hour (45 �pm) to prevent <br /> buildup of. pressure in drop b�x <br /> 3. Use value from design o1 pressure distribu•eion system <br /> SELECTED PiJMP CAPACI'I'Y . . . . . . . . . . . . . . .. . _ 2 E. � �;��nl <br /> T3. Determine head requirements: ... " <br /> 1 . Elevation dif•ference between pump and poi�it of discharQe � 7 �'`' feet <br /> 2. If pumping to a pressure distribution system, add 5 feet <br /> for pressure required at manitold . . . . . . . . . . ,5 [eet <br /> 3. Friction loss ---�----- <br /> a. Enter friction loss table with gpm and pipe diameter. ' ' <br /> Read friction loss in feet per 100 feet from page F-1R. <br /> F. L. _ � 9 ft/100 ft ' " <br /> b. Determine total pipe length from pump to��,j.�char�e <br /> ' point. Add 25 percent to ��ipe len�th for Fittin�;�• <br /> loss, or iise a f LCClllf; loss clicirt. Lqu.ivaleiit �ai�>e <br /> len�th = 1 . 2� times {�ipc len�.�Ch = 1. 25 x Q� - /Up t�,ec <br /> --4----- -- - <br /> c. Ca1cul.aCc� l'oCa] Prictic�n 1���;s by �ui�lfipl.yinf� <br /> fricl'i.on ]05:; In Pt/:1OO ft hy cquiv:�lc�nC ��inc " <br /> lenRth. <br /> 'Total friction loss = �, 9 p� •• X' �DD = __ p, } fc�er. <br /> 4. Total head required is the sum of elevation difference, <br /> special head requirements, and total friction loss. <br /> 7t + $ + 8, 9... , . , <br /> TOTAL HFAD . . . . . . . . . . . . . . . . . . . . . . ZU. � � <br /> . fc��t <br /> C. Pump selection <br /> 1 . A pump must be selected Eo delivcr a� 1.ensC 2�• 6 ,, gpm <br /> with at least 2 O, g feet of total head�. � <br /> D. To tnaximize pump liEc 5ul��cl' sump sizc fc�r 4 Lo 5 ptiui�� <br /> operations. per d:�y. � , . <br /> I?. Calculate drainb:ic�k <br /> 1 . Determine Cotal pi.��c Lenf,L-h, �O fcet . <br /> 2. Determine liquid volume of. pipe,Y�,�� 'p,allons per " • <br /> 100 feet. (Sec page 1:-18) '"' - ' � ' . <br /> 3. Multiply length by volume: Drainbacic quantity = <br /> e�� feet x 7.7 7 �allons/100 ft = . 2 �allons <br /> 4. Suggested drainback quantity is l0 percent of pumped quantity. <br /> A larger drainback percentafie will decr�ase pump station <br /> efficiency• sli�htly but pumpin� encrGy coSts are USLl811y a <br /> relatively smzl] r�rt oE the tota7. h�usehold enerry costs. • <br />