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F-17 <br /> . � <br /> � PUMP SELECTION PROCEDURE <br /> Fl�D PERFORA7FON OF A PERFORdTEp �pTERl� <br /> A Determine pump capadty: ,�,.�„„ <br /> Gravity Distribution T,,,,,, <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of _ , .. � a���� �� <br /> water use rate. �''°"�5a°�"� :`�`,�-;�•�� <br /> .�., <br /> 3. Maximum suggested for delivery to a drop box of a home system is 2,700 „ , �•«••�����+o.a«.��. <br /> ��� � <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. .,; '-��m,,, ,Z•,o Ea�. <br /> w er aac.lo�.r <br /> .. . Mamk�r teu+M et <br /> Pressure Distibution �.�cw�sar tosr g`"�^a�•�•� <br /> 3.a. Select number of perforated laterals 3 � . � <br /> b. Select perforation spacing=�feet �,���, �� <br /> c Subt�ra�2 ft.from the rock layer]ength. <br /> �---�,�-2 ft._��feet <br /> d. Deternune the number of spaces between perforations. <br /> Length perf•spacing=�ft.+ 3 ft.= a� spaces Requined PaforaflonD�� <br /> e. �,spaces+1=�_perforations/lateral ��ttong per m�mce(gQa►j <br /> f. Multiply perforations per lateral by2 number3f laterals to �13.z'���, '�e ��� ��� <br /> get total number of perforations. ,,,�� x���,_��perforations. ��� A <br /> g' "F� X�r�_�$p�• . <br /> 1.Oa 0.56 0.74 <br /> SELECT'ED PU1V8 CAPACITY_3� gpm 2.�b �.8� 1.�4 ' <br /> B.Determine head requirements: a.Use for single family homes <br /> 1. Elevation difference between pump and point of discharge. b.Use for all other applicatiorts <br /> '� feet <br /> � Z If pumping to a pressure distribudon system,five feet for pressure <br /> rPquired at manifold if gravity s stem,zero. <br /> _�feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � Pipe Length <br /> Read friction loss in feet per 100 feet from table. � Poinc of Disch, <br /> F.L= �,L f�/100 ft of pipe �j� <br /> b. Determine total pipe length from pump to discharge Elevation Diffexerscel <br /> point. Add 25 percent to pipe length for fitting �p � <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> �S x1.25=�feet <br /> c Calculate total friction loss by muldplying ls���0 inch 3.0 inch <br /> gpm ��oosat� <br /> friction loss in ft/100 ft by equivalent pipe length. 10 0.69 0.20 <br /> Total friction loss= a• le x�+100= I feet 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38 <br /> special head requirements,and total friction loss. 16 1.63 0.48 <br /> 18 203 0.60 <br /> 20 2.47 0.73 0.11 <br /> �_+ .� + � 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1S5 0.23 <br /> ' 35 7.90 206 0.30 <br /> TOTAL HEAD �feet • '� 11.07 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> ' S0 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo s.6o o.s2 <br /> j 1. A pump must be selected to deliver at least <br /> ::�s` �gpm (Step A) with at least �feet of total head(Step B). <br />