Laserfiche WebLink
PU11�P SELECTION PROCEDURE ` � <br /> A. Determine pump capacity: <br /> CGravity Distribution EMD PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of ��,,,, ��„ <br /> water use rate. <br /> Topwil <br /> 2. Maximum suggested for delivery to a drop bcx nf a home��stem is 2,700 <br /> .��Loyer of Geol�xtll� foMlc(or far- <br /> gallons per hour{45 gpm) to prevent build-up of pressure in drop box. ' ��mY s,�a �,�, ,,,��,a,.�,,r�r a.,,,,,,��ra, <br /> �:�rith red rosin poper) <br /> n ar e c a . Perloratioa Orlll�d Hwiza+tolly <br /> Pressure Distribution • •• • .� Nto p Ncur 7op <br /> 3. a. Select number of perforated laterals Z '�.:��� , A� ��o�� �z•�o eac� <br /> ran FI•IO_Rock ,. .,- �' ol Roct layer <br /> b. Select perforadon spacing= � ft. � P„r«a,;o�>�w��a a� <br /> c Subtr�t 2 ft.from the rock layer length. uw�s�a �ri, B°"°m o� �o�«a� <br /> �^ -2 ft._ .,� ft. <br /> r <br /> ref �8� <br /> Orlpinal Soll Propvly Scoritl�d <br /> B�ton Plackp Sond Loyer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= �.;,.: ft.+ ' ft._ ��< : spaces <br /> TABLE OF PERFORATION DISCHARGFS IN GPM <br /> e. �v spaces+ 1 = ��"' perforations/lateral <br /> ' f. Multiply perforaHons per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. � <br /> ' '/ <br /> ,y�-. x '�� �Qa1=�perforations.��'.� " • <br /> ].Oa OS6 0.74 <br /> (���I X ,' " : - m ]5 0.69 0.90 <br /> g' � sP7-�=.iL gp z.ob o.so �.oa <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY �� m 3.0 0.98 1.2s <br /> �-�$p 4.0 ].13 1.47 <br /> 5.0 126 1.65 <br /> B.Determine head requirements: <br /> aUse 1.0 foot of head for residential systems. <br /> 1. Elevation difference between pump and poi�lt of discharge. bUse 2o f�c of head tor ocher escabiut,n,encs <br /> �.�feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> �_feet <br /> 3. Friction loss Pipe Lengeh <br /> ; ; <br /> a. Enter friction loss table with gpm and pipe diametcr. Poinc of Dischar�e <br /> Read friction loss in feet per 100 feet from table. a�ss p <br /> F.L._ �,•(� ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge p„n,p �,�y � <br /> , point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> length-1.25 times pipe length= <br /> �/�/ 1.5 inch 2.0 inch 3.0 inch <br /> �� X 1.�J=�f�ft gpm Friaim loss per 100 ft of pipe <br /> c. Calculate total fricHon loss by multiplying l0 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= a, c� x ���_+100=�_feet 14 1.28 0.38 <br /> 4. Total hcad required is the sum of cicvation differct�ce, 16 1.63 0.48 <br /> 18 2.03 0.60 <br /> special head recluirements,and total frictiot� loss. 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> �� + .S� + Z 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 O.�n <br /> 40 11.07 2.64 O.:iy <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD 1 `� feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> � 1. A pump must be selected to deliver at least�� gpm (Step A) <br /> ��ith at least�� feet of total head (Step B). <br />