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•f . <br /> � • PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: �� <br /> � <br /> Cravlty Distrlbutlon E►JD PERFORAT��P� �F A PERfORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour 1 gpm) t stay ahead of ��,N�,,,,, <br /> water use rate. <br /> Topwll � <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 , ...�,, _ <br /> gallons�per hour(45 gprh) to prevent build-up of pressure in drop box. '� ` �o«�,,s�,w ,,ri, �,�„�,°���������«Wl�k��� <br /> ���' w11A rosl�paper) <br /> Pxlwollw�p�I1Nd 1laltonlallr <br /> Pressure Distribu n / � � ��o D ►Naf 10p <br /> 3. a. Select numbe of perforated lateraj6 '%p • � � ��� 1z•�� �a• <br /> � _ o MI Rac = ol Roct Lay�r <br /> b. Select rforati s acin ft. � � '` - � � <br /> Pe P b' �� v«raa��on.t.xa�.a o� <br /> c. Subtract 2 ft. from he rock 1 er length. <br /> � Clwn Sand l.oytr Bo�tom el Lat�ral <br /> ��,-2ft. = j . . , . . . <br /> ak��oi son �en.riy s�«�nw <br /> e.�a.Pwa� sa�e�ar.. <br /> d. Determine the num o spaces between perforations. <br /> Length perf. spaci = ft.+ ft.= SpaCes TABLE OF PERAORATION DISCHARCFS 1N GPM <br /> e. spaces+ 1 - orations/lateral <br /> f. Multiply perfor Nons per latera y number of laterals to Head PerforaHon dlameter(lnches) <br /> get total num r of perforations. - <br /> �� x �= perforations. ��n ��' <br /> �.a o.sb oaa <br /> g _ l S Ob9 0.90 <br /> r.r. X aT�_ gpm• 'L� 2.Ob o.80 �.oa <br /> 1 o z.s o.sv i.v <br /> 3.0 0.98 1.28 <br /> SELECTED PUMP CAPACITY gpm 4.0 �.13 t.4� <br /> 5.0 126 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between um and mt of dischar e. AUse l.0 foot of head for residentlal systems. <br /> ��pfeet v� g bUse 2A kes of head for ocher esmbit,hn,en�s <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> � feet <br /> 3. Friction loss � �P��B� <br /> a. Enter fricdon loss table with gpm and pipe diameter. Point of D;scharge <br /> Read friction loss in feet per 100 feet from table. <br /> F.L. _ � Z2 ft./100 ft of pipe Elcvation Differcnco <br /> b. Determine total pipe length from pump to discharge p„n,p <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitHng loss chart. Equivalent pipe F-18b <br /> length-1.25 Hmes pipe length= 1.5 inch 2.0 inch 3.0 inch <br /> � 2m x 1.25 =�feet gpm ��aa,�..P«ioo n�c Pi� <br /> c. Calculate total fricdon loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total fricNon loss= �ob x , z +100= (3 , feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> s ial head uirements,and total friction loss. 18 2.03 0.60 <br /> p� � 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> � 4° + � +�� 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 030 <br /> 40 11.07 2 039 <br /> .28 0.48 <br /> TOTAL HEAD 2� feet SO 3. 0.58 <br /> SS 4.76 0.70 <br /> ��� 60 5.60 0.82 <br /> C. Pump selection I� <br /> 1. A pump must be selected to deliver at least�gpm (Step A) � <br /> with at least 2�feet of total head (Step B). �]�/e��j n v rYY� � <br /> / <br /> t' <br /> �G�.�� � S �o�- � �a Q� �' i� � � ►� a�� z� H��d ��` <br /> `Z �e �c�..�w�, L���---� �� ` _ c,R�.-c.�, �c�w�.- G�r� <br />